SX9512EWLTRT - Semtech - Datasheet.Live

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1

SX

9512/12B

/

13

/13B

8 Capacitive Buttons, LEDs and

Proximity Controller with Analog Outputs

G

ENERAL

D

ESCRIPTION

The SX9512/12B and SX9513/13B are 8–button

capacitive touch sensor controllers that include 8-

channels of LED drivers, a buzzer and analog

outputs designed ideally for TV applications. The

SX9512/12B offers proximity sensing.

The SX9512/12B and SX9513/13B operate

autonomously using a set of programmable button

sensitivities & thresholds, plus LED intensities &

breathing functions with no external I2C

communication required.

All devices feature three individual LED driver

engines for advanced LED lighting control. On the

SX9512/12B, a proximity detection illuminates all

LEDs to a pre-programmed intensity. Touching a

button will enable the corresponding LED to a pre-

programmed mode such as intensity, blinking or

breathing.

Whenever the capacitive value changes from

either a proximity detection or finger

touch/release, the controller informs the host

processor through the analog output(s) or an open

drain interrupt and an I2C register read.

The SX9512/12B and SX9513/13B do not require

additional external dynamic programming support

or setting of parameters and will adapt to humidity

and temperature changes to guarantee correct

touch/no touch information.

The B versions have a different pre-programmed

I2C address.

The SX9512/12B and SX9513/13B are offered in

20-ld QFN and 24-ld TSSOP packages and operate

over an ambient temperature range of -40°C to

+85°C.

T

YPICAL

A

PPLICATION CIRCUIT

I2C

TOUCH

BUTTON &

LED

DRIVER

INTERFACE

GPO/LED

ENGINE

OSC

POR

CONTROL

VDD

CAPACITIVE

TOUCH BUTTONS

SVDD

SCL

SDA

LS

ANALOG

OUTPUT

SX9512/12B/13/13B

AOUT2/

NIRQ/

BUZZER/

PWRSTATE

NVM

AOUT1

LED [7:0]

NRST

GND

PWRON

BL7

BL6

BL5

BL4

BL3

BL2

BL1

BL0

SPO1

SPO2

SVDD

K

EY

P

RODUCT

F

EATURES

 Separate Core and I/O Supplies

o 2.7V – 5.5V Core Supply Voltage

o 1.65V – 5.5V I/O Supply Voltage



Support Metal Overlay UI Design (SX9512/12B)

 8 - Button Capacitance Controller

o Capacitance Offset Compensation to 40pF

o Adaptive Measurements For Reliable Proximity And

Button Detection

 Proximity Sensing (SX9512/12B)

o High Sensitivity

o LEDs Activated During Proximity Sense

 8-channel LED Controller & Driver

o Blink And Breathing Control

o High Current, 15 mA LED Outputs

 2-Channel Analog Output, 6-bit DAC Programmable

Control

 Programmable Buzzer

 Simple (400kHz) I

2

C Serial Interface

o Interrupt Driven Communication via NIRQ Output

 Power-On Reset, NRST Pin and Soft Reset

 Low Power

o Sleep, Proximity Sensing: 330uA

o Operating: 600uA

 -40°C to +85°C Operation

 4.0 mm x 4.0 mm, 20-lead QFN package

 4.4 mm x 7.8 mm, 24-lead TSSOP package

 Pb & Halogen free, RoHS/WEEE compliant

A

PPLICATIONS

 LCD TVs, Monitors

 White Goods

 Consumer Products, Instrumentation, Automotive

 Mechanical Button Replacement

O

RDERING

I

NFORMATION

Part Number

Package

Marking

SX9513EWLTRT

1

QFN-20 ZF3A

SX9513ETSTRT

2

TSSOP-24 AC70R

SX9512EWLTRT

1

QFN-20 ZH57

SX9512ETSTRT

2

TSSOP-24 AC71S

SX9513BEWLTRT

1

QFN-20 ZB13

SX9513BETSTRT

2

TSSOP-24 AB13G

SX9512BEWLTRT

1

QFN-20 Z8CA

SX9512BETSTRT

2

TSSOP-24 AB12F

SX9510EVK Evaluation Kit -

1

3000 Units/Reel

2

2500 Units/Reel

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SX

9512/

12B/13/13B

8 Capacitive Buttons, LEDs and

Proximity Controller with Analog Outputs

Table of Contents

G

ENERAL

D

ESCRIPTION

........................................................................................................................ 1

T

YPICAL

A

PPLICATION CIRCUIT

............................................................................................................ 1

K

EY

P

RODUCT

F

EATURES

..................................................................................................................... 1

A

PPLICATIONS

....................................................................................................................................... 1

O

RDERING

I

NFORMATION

...................................................................................................................... 1

1 G

ENERAL

D

ESCRIPTION

............................................................................................................... 4

1.1

Pin Diagram 4

1.2

Marking information SX9513/13B 4

1.3

Marking information SX9512/12B 5

1.4

Pin Description 7

1.5

Simplified Block Diagram 8

1.6

Acronyms 8

2 E

LECTRICAL

C

HARACTERISTICS

................................................................................................. 9

2.1

Absolute Maximum Ratings 9

2.2

Recommended Operating Conditions 9

2.3

Thermal Characteristics 9

2.4

Electrical Specifications 10

3 F

UNCTIONAL DESCRIPTION

........................................................................................................ 12

3.1

Introduction 12

3.2

Scan Period 13

3.3

Operation modes 14

3.4

Sensors on the PCB 14

3.5

Button Information 15

3.6

Buzzer 16

3.7

Analog Output Interface 16

3.8

Analog Sensing Interface 18

3.9

Configuration 21

3.10

Clock Circuitry 21

3.11

I2C interface 21

3.12

Interrupt 21

3.13

Reset 23

3.14

LEDS on BL 25

4 D

ETAILED

C

ONFIGURATION DESCRIPTIONS

.............................................................................. 29

4.1

Introduction 29

4.2

General Control and Status 31

4.3

LED Control 34

4.4

CapSense Control 38

4.5

SPO Control 43

4.6

Buzzer Control 44

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9512/

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8 Capacitive Buttons, LEDs and

Proximity Controller with Analog Outputs

4.7

Real Time Sensor Data Readback 45

5 I2C

I

NTERFACE

........................................................................................................................... 47

5.1

I2C Write 47

5.2

I2C read 48

6 P

ACKAGING

I

NFORMATION

........................................................................................................ 49

6.1

Package Outline Drawing 49

6.2

Land Pattern 51

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12B/13/13B

8 Capacitive Buttons, LEDs and

Proximity Controller with Analog Outputs

1 G

ENERAL

D

ESCRIPTION

1.1 Pin Diagram

BL7

LS

VDD

GND

BL1

BL0

SVDD

SCL

SDA

Top View

1

GND

2

LS

3

BL7

4

BL6

5

BL5

6

BL4

7

BL3

8

BL2

9

BL1

10

BL0 15 SCL

16 NC

17 NRST

18 PWRON

19 NC

20 SPO1

21 SPO2

22 GND

24 VDD

23 VDD

11

NC

12

NC 13 SVDD

14 SDA

Figure 1 Pinout Diagram (QFN, TSSOP)

1.2 Marking information SX9513/13B

ZF3A

yyww

xxxxx

yyww = Date Code

xxxxx = Semtech lot number

AC70R

yyww

xxxxxxxx

yyww= Date Code

xxxxxxxx= Semtech lot

Figure 2 Marking Information SX9513 (QFN, TSSOP)

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SX

9512/

12B/13/13B

8 Capacitive Buttons, LEDs and

Proximity Controller with Analog Outputs

ZB13

yyww

xxxxx

yyww = Date Code

xxxxx = Semtech lot number

Figure 3 Marking Information SX9513B (QFN, TSSOP)

1.3 Marking information SX9512/12B

ZH57

yyww

xxxxx

yyww = Date Code

xxxxx = Semtech lot number

AC71S

yyww

xxxxxxxx

yyww= Date Code

xxxxxxxx= Semtech lot

Figure 4 Marking Information SX9512 (QFN, TSSOP)

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SX

9512/

12B/13/13B

8 Capacitive Buttons, LEDs and

Proximity Controller with Analog Outputs

Z8CA

yyww

xxxxx

yyww = Date Code

xxxxx = Semtech lot number

Figure 5 Marking Information SX9512B (QFN, TSSOP)

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SX

9512/

12B/13/13B

8 Capacitive Buttons, LEDs and

Proximity Controller with Analog Outputs

1.4 Pin Description

QFN Pin

TSSOP

Name Type Description

1 4 BL6 Analog Button Sensor and Led Driver 6

2 5 BL5 Analog Button Sensor and Led Driver 5

3 6 BL4 Analog Button Sensor and Led Driver 4

4 7 BL3 Analog Button Sensor and Led Driver 3

5 8 BL2 Analog Button Sensor and Led Driver 2

6 9 BL1 Analog Button Sensor and Led Driver 1

7 10 BL0 Analog Button Sensor and Led Driver 0

8 13 SVDD Power

IO Power Supply, SVDD must be ≤ VDD

9 14 SDA Digital Input/Output I2C Data, requires pull up resistor to SVDD (in host or external)

10 15 SCL Digital Input I2C Clock, requires pull up resistor to SVDD(in host or external)

11 17 NRST Digital Input Active Low Reset. Connect to SVDD if not used.

12 18 PWRON

Digital Output Power On Signal (positive edge triggered, push pull)

14 20 SPO1 Analog

Special Purpose Output 1:

- AOUT1: Analog Voltage indicating touched buttons (filtered digital)

15 21 SPO2 Analog/Digital

Special Purpose O

utput 2:

- AOUT2: Analog Voltage indicating touched buttons (filtered digital)

- BUZZER: Driver (digital push-pull output)

- NIRQ: Interrupt Output, active low (digital open drain output)

-

PWRSTATE: S

ignal indicating system power state

(digital input)

16 22 GND Ground Ground

17 23 VDD Power Power Supply

18 24 VDD Power Power Supply

19 2 LS Analog Led Sink/Shield

20 3 BL7 Analog Button Sensor and Led Driver 7

bottom

plate 1 GND Ground Connect to ground

13 11, 12,

16, 19 NC No Connect Leave Floating

Table 1 Pin description

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SX

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8 Capacitive Buttons, LEDs and

Proximity Controller with Analog Outputs

1.5 Simplified Block Diagram

I2C

TOUCH

BUTTON &

LED

DRIVER

INTERFACE

GPO/LED

ENGINE

OSC

POR

CONTROL

VDD

CAPACITIVE

TOUCH BUTTONS

SVDD

SCL

SDA

LS

ANALOG

OUTPUT

AOUT2/

NIRQ/

BUZZER/

PWRSTATE

NVM

AOUT1

LED [7:0]

NRST

GND

PWRON

BL7

BL6

BL5

BL4

BL3

BL2

BL1

BL0

SPO1

SPO2

SVDD

SX9512/12B/13/13B

Figure 6 Simplified Block diagram

1.6 Acronyms

AOI Analog Output Interface

ASI Analog Sensor Interface

NVM Non Volatile Memory

PWM Pulse Width Modulation

SPO Special Purpose Output

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8 Capacitive Buttons, LEDs and

Proximity Controller with Analog Outputs

2 E

LECTRICAL

C

HARACTERISTICS

2.1 Absolute Maximum Ratings

Stresses above the values listed in “Absolute Maximum Ratings” may cause permanent damage to the device.

This is a stress rating only and functional operation of the device at these, or any other conditions beyond the “Recommended Operating

Conditions”, is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

Parameter Symbol Min. Max. Unit

Supply Voltage VDD, SVDD -0.5 6.0 V

Input voltage (non-supply pins) V

IN

-0.5 VDD + 0.3 V

Input current (non-supply pins) I

IN

-10 10 mA

Operating Junction Temperature T

JCT

-40 150 °C

Reflow temperature T

RE

260 °C

Storage temperature T

STOR

-50 150 °C

ESD HBM (Human Body model)

(i)

ESD

HBM

3 kV

Latchup

(ii)

I

LU

± 100 mA

Table 2 Absolute Maximum Ratings

(i) Tested to JEDEC standard JESD22-A114

(ii) Tested to JEDEC standard JESD78

2.2 Recommended Operating Conditions

Parameter Symbol Min. Max. Unit

Supply Voltage VDD 2.7 5.5 V

Supply Voltage (SVDD must be ≤ VDD) SVDD 1.65 5.5 V

Ambient Temperature Range T

A

-40 85 °C

Table 3 Recommended Operating Conditions

2.3 Thermal Characteristics

Parameter Symbol Conditions Min. Typ. Max. Unit

Thermal Resistance- QFN package - Junction to Ambient

θ

JA,QFN

Note

(vi)

25 °C/W

Thermal Resistance –TSSOP package - Junction to Ambient

θ

JA,SSOP

Note

(vi)

78 °C/W

Table 4 Thermal Characteristics

(vi)

ThetaJA is calculated from a package in still air, mounted to 3" x 4.5", 4 layer FR4 PCB with thermal vias under

exposed pad (if applicable) per JESD51 standards.

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8 Capacitive Buttons, LEDs and

Proximity Controller with Analog Outputs

2.4 Electrical Specifications

All values are valid within the operating conditions unless otherwise specified.

Parameter Symbol Conditions Min. Typ. Max. Unit

Current consumption

Sleep I

sleep

All

buttons are

scanned at a

200ms rate. (40ms scan with

skip 4 frames) 330 350 uA

Operating I

operating

All buttons ar

e scanned at a 40

ms rate, excluding LED forward

current. 600 650 uA

Input Levels NRST, SCL, SDA, SPO2 (in PWRSTATE mode)

Input logic high V

IH

0.7*SVDD SVDD + 0.3 V

Input logic low V

IL

GND applied to GND pins GND - 0.3 0.3*SVDD V

Input leakage current L

I

CMOS input ±1 uA

Output PWRON, SPO1, SPO2, SDA

Output logic high

(PWRON, SP01, & SPO2 Only) V

OH

I

OH

<3mA SVDD-0.4 V

Output logic low V

OL

I

OL,

<6mA 0.6 V

CapSense Interface

Offset Compensation Range C

off

40 pF

Power up time t

por

10 ms

Reset

Power on reset voltage V

por

1.1 V

Reset time after power on t

por

1 ms

Reset pulse width on NRST t

res

20 ns

Recommended External components

capacitor between SVDD, GND C

vreg

tolerance +/-20% 0.1 uF

capacitor between VDD, GND C

vdd

tolerance +/-20% 0.1 uF

Table 5 Electrical Specifications

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9512/

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8 Capacitive Buttons, LEDs and

Proximity Controller with Analog Outputs

Parameter Symbol Conditions Min. Typ. Max. Unit

I2C Timing Specifications

(i)

SCL clock frequency f

SCL

400 KHz

SCL low period t

LOW

1.3 us

SCL high period t

HIGH

0.6 us

Data setup time t

SU;DAT

100 ns

Data valid time t

VD;DAT (II)

0.9 us

Data hold time t

HD;DAT

0 ns

Repeated start setup time t

SU;STA

0.6 us

Start condition hold time t

HD;STA

0.6 us

Stop condition setup time t

SU;STO

0.6 us

Bus free time between stop and start t

BUF

1.3 us

Input glitch suppression t

SP

Up to 0.3xVDD from GND, down

to 0.7xVDD from VDD 50 ns

Table 6 I2C Timing Specification

Notes:

(i) All timing specifications, Figure 7 and Figure 8, refer to voltage levels (V

IL

, V

IH

, V

OL

) defined in Table 5.

(ii) t

VD;DAT =

Minimum time for SDA data out to be valid following SCL LOW.

The interface complies with slave F/S mode as described by NXP: “I2C-bus specification, Rev. 03 - 19 June 2007”

Figure 7 I2C Start and Stop timing

Figure 8 I2C Data timing

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9512/

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8 Capacitive Buttons, LEDs and

Proximity Controller with Analog Outputs

3 F

UNCTIONAL DESCRIPTION

3.1 Introduction

3.1.1 General

The SX9512/12B/13/13B is intended to be used in applications which require capacitive sensors covered by

isolating overlay material and which may need to detect the proximity of a finger/hand though the air. The

SX9512/12B/13/13B measures the change of charge and converts that into digital values. The larger the charge

on the sensors, the larger the number of digital value will be. The charge to digital value conversion is done by the

SX9512/12B/13/13B Analog Sensor Interface (ASI).

The digital values are further processed by the SX9512/12B/13/13B and converted in a high level, easy to use

information for the user’s host.

The information between SX9512/12B/13/13B and the user’s host is passed through the I2C interface with an

additional interrupt signal indicating that the SX9512/12B/13/13B has new information. For buttons this

information is simply touched or released. The SX9512/12B/13/13B can operate without the I2C and interrupt by

using the analog output interface (SPO1, SPO2) with a changing voltage level to indicate the button touched.

3.1.2 Feedback

Visual feedback to the user is done by the button and LED pins BL[7...0]. The LED drivers will fade-in when a

finger touches a button or proximity is detected and fade-out when the button is released or finger goes out of

proximity. Fading intensity variations can be logarithmic or linear. Interval speed and initial and final light intensity

can be selected by the user.

Audible feedback can be obtained through the Special Purpose Output (SPO2) pin connected to a buzzer.

3.1.3 Analog Output Interface SPO1 and SPO2

The Analog Output Interface (AOI) is a Digital signal driven from GND to SVDD and controlled by a PWM. When

the digital signal on the SPO line is filtered with an RC low pass filter you produce a DC voltage, the level of which

depends on the buttons that has been touched. A host controller can then measure the voltage delivered by the

SPO output and determine which button is touched at any given time.

The AOI feature allows the SX9512/12B/13/13B device to directly replace legacy mechanical button controllers in

a quick and effortless manner. The SX9512/12B/13/13B supports up to two Analog Output Interfaces, on SPO1

and SPO2 respectively. The SX9512/12B/13/13B allows buttons to be mapped on either SPO1 or SPO2. The

button mapping as well as the mean voltage level that each button produces on an SPO output can be configured

by the user through a set of parameters described in later chapters.

3.1.4 Buzzer

The SX9512/12B/13/13B can drive a buzzer (on SPO2) to provide audible feedback on button touches. The

buzzer provides two phases, each of which can vary from 5ms to 30ms in length and can drive 1KHz, 2KHz, 4KHz

or 8KHz tones.

3.1.5 Configuration

The control and configuration registers can be read from and written to an infinite number of times. During the

development phase the parameters can be determined and fine tuned by the users and updated over the I2C.

Once the parameter set has been determined, the settings can be downloaded over the I2C by the host each time

the SX9512/12B/13/13B boots up or they can be stored in the Multiple Time Programmable (MTP) Non Volatile

Memory (NVM) on the SX9512/12B/13/13B. This allows the flexibility of dynamically setting the parameters at the

expense of I2C traffic or autonomous operation without host intervention.

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8 Capacitive Buttons, LEDs and

Proximity Controller with Analog Outputs

After the parameters are written to the NVM, the registers can still be dynamically overwritten in whole or in part

by the host when desired.

3.2 Scan Period

The SX9512/12B/13/13B interleaves the sensing of the touch buttons with the driving of the LEDs. To keep the

LED intensities constant and flicker free the BL sensing is done in a round robin fashion with an LED drive period

between each of the BL sensing periods.

BL0

BL1

BL2

BL3

BL4

BL7

PROX

Figure 9 CapSense Scan Frame SX9512/12B/13/13B

To keep timing consistency the scan frame always cycles through all channels (BL0 to BL7) and Combined

Channel proximity even if a channel is disabled or a device does not have the proximity feature. This means that

the frame time is always the sum of nine CapSense measurement times and nine LED PWM times.

The SX9512/12B/13/13B can reduce it’s average power consumption by inserting fames that skip the CapSense

measurements but maintain the LED PWM timing.

The Scan period of the SX9512/12B/13/13B is the time between the measurement of a particular channel and its

next measurement. This period is the time for one CapSense frame plus the time for any skip frames and is the

key factor in determining system touch response timing.

Figure 10 shows the different SX9512/12B/13/13B periods over time.

Figure 10 Scan Period SX9512/12B/13/13B

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3.3 Operation modes

The SX9512/12B/13/13B has 2 operation modes, Active and Sleep. The main difference between the 2 modes is

found in the reaction time (corresponding to the scan period) and power consumption.

Active mode offers fast scan periods. The typical reaction time is 40ms. All enabled sensors are scanned and

information data is processed within this interval.

Sleep mode increases the scan period time which increases the reaction time to 200ms typical and at the same

time reduces the operating current.

The user can specify other scan periods for the Active and Sleep mode and decide for other compromises

between reaction time and power consumption.

In most applications the reaction time needs to be fast when fingers are present, but can be slow when no person

uses the application. In case the SX9512/12B/13/13B is not used during a scan frame it will go from Active mode

into Sleep mode and power will be saved. (when sleep mode is enabled)

To leave Sleep mode and enter Active mode this can be done by a touch on any button or the detection of

proximity.

The host can decide to force the operating mode by issuing commands over the I2C (using register 0x3A[3]) and

take fully control of the SX9512/12B/13/13B. The diagram in Figure 11 shows the available operation modes and

the possible transitions.

ACTIVE mode

SLEEP mode

I2Ccmd

OR proximity

OR touch any button

Power On

passive

timeout

Figure 11 Operation modes

3.4 Sensors on the PCB

The capacitive sensors are relatively simple copper areas on the PCB connected to the eight SX9512/12B/13/13B

capacitive sensor input pins (BL0…BL7). The sensors are covered by isolating overlay material (typically

1mm...3mm). The area of a sensor is typically one square centimeter which corresponds to about the area of a

finger touching the overlay material. The area of a proximity sensor is usually significantly larger than the smaller

touch sensors.

The SX9512/12B and the SX9513/13B capacitive sensors can be setup as ON/OFF buttons for control

applications (see example Figure 12).

Figure 12 PCB top layer of touch buttons sensors surrounded by the shield, SX9512/12B/13/13B

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8 Capacitive Buttons, LEDs and

Proximity Controller with Analog Outputs

The SX9512/12B offers 2 options for proximity detection. Depending on the PCB area, the proximity detection

distance can be optimized.

1) Individual Sensor Proximity

Single sensor proximity is done by replacing the shield area shown in Figure 10 with a connection to BL0 as

shown in Figure 24.

Figure 13 PCB top layer for proximity and touch buttons, SX9512/12B

2) Combined Channel Proximity

In Combined Channel Proximity the SX9512/12B will put some or all of the sensors in parallel and execute one

sensing cycle on this combined large sensor.

3.5 Button Information

The touch buttons have two simple states (see Figure 14): ON (touched by finger) and OFF (released and no

finger press).

Figure 14 Buttons

A finger is detected as soon as the digital values from the ASI reach a user-defined threshold plus a hysteresis.

A release is detected if the digital values from the ASI go below the threshold minus a hysteresis. The hysteresis

around the threshold avoids rapid touch and release signaling during transients.

Buttons can also be used to do proximity sensing. The principle of proximity sensing operation is exactly the same

as for touch buttons except that proximity sensing is done several centimeters above the overlay through the air.

ON state means that finger/hand is detected by the sensor and OFF state means the finger/hand is far from the

sensor and not detected.

Figure 15 Proximity

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8 Capacitive Buttons, LEDs and

Proximity Controller with Analog Outputs

3.6 Buzzer

The SX9512/12B/13/13B has the ability to drive a buzzer (on SPO2) to provide an audible indication that a button

has been touched. The buzzer is driven by a square wave signal for approximately 10ms (default). During both

the first phase (5ms) and the second phase (5ms) the signal’s frequency is default 1KHz.

The buzzer is activated only once during any button touch and is not repeated for long touches. The user can

choose to enable or disable the buzzer by configuration and define the idle level, frequencies and phase durations

(see §4.6).

Figure 16 Buzzer behavior

3.7 Analog Output Interface

The Analog Output Interface outputs a PWM signal with a varying duty cycle depending on which button is

touched. By filtering (with a simple RC filter) the PWM signal results in a DC voltage that is different for each

button touch. The host controller measures the DC voltage level and determines which buttons has been touched.

In the case of single button touches, each button produces its own voltage level as configured by the user.

Figure 17 show how the AOI will behave when the user touches and releases different buttons.

The AOI will switch between the AOI idle level and the level for each button.

Figure 17 AOI behavior

The PWM Blocks used in AOI modes are 6-bits based and are typically clocked at 2MHz.

Figure 18 shows the PWM definition of the AOI.

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8 Capacitive Buttons, LEDs and

Proximity Controller with Analog Outputs

Figure 18 PWM definition, (a) small pulse width, (b) large pulse width

The AOI always reports one button per output channel. The AOI can be split over SPO1 and SPO2 (AOI-A, AOI-

B. The user can map any button to either AOI-A or AOI-B or both.

In most applications only one AOI pin will be selected. The two AOI pins allow the user to use a more coarse

detection circuit at the host. Assuming a 3.3V supply and 8 buttons on one single AOI then the AOI levels could

be separated by around 0.3…0.4V. In the case of using the two AOI pins, 4 buttons could be mapped on AOI-A

separated by around 0.8V (similar for 4 buttons on AOI-B) which is about double that of the case of a single AOI.

In the case of a single touch the button reporting is straight forward (as in Figure 17). If more than one button is

touched the reported depends on the selected button reporting mode parameter (see yyy). Three reporting modes

exist for the SX9512/12B/13/13B (All, Single and Strongest).

The All reporting mode is applicable only for the I2C reporting (AOI is not available). In All-mode all buttons that

are touched are reported in the I2C buttons status bits and on the LEDs. In the Single-mode a single touched

button will be reported on the AOI and the I2C. All touches that occur afterwards will not be reported as long as

the first touch sustains. Only when the first reported button is released will the SX9512/12B/13/13B report another

touch.

Figure 19 shows the Single-mode reporting in case of 2 touches occurring over time.

Figure 19 Single-mode reporting with 2 touches

At time t1 button0 is touched and reported on the AOI. At time t2 button1 is touched as well but not reported. At

time t3 the button0 is released and button1 will be reported immediately (or after one scan period at idle level). At

time t4 both buttons are released and the AOI reports the idle level.

The button with the lowest Cap pin index will be reported in case of a simultaneous touch (that means touches

occurring within the same scan period).

In the Strongest-mode the strongest touched button will be reported on the AOI and the I2C. All touches that

occur afterwards representing a weaker touch will not be reported. Only a touch which is stronger will be reported

by the SX9512/12B/13/13B.

Figure 20 shows the Strongest-mode reporting in case of 2 touches (with bt1 the strongest touch).

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Figure 20 Strongest-mode reporting with 2 touches

At time t1 button0 is touched and reported on the AOI. At time t2 button1 is touched as well. As bt1 is the

strongest touch it will be reported on the AOI immediately (or after one scan period at idle level). At time t3 the

button0 is released while the AOI continues to report button1. At time t4 both buttons are released and the AOI

reports the idle level.

3.8 Analog Sensing Interface

The Analog Sensing Interface (ASI) induces a charge on the sensors and then converts the charge into a digital

value which is further digitally processed. The basic principle of the ASI will be explained in this section.

The ASI consists of a multiplexer selecting the sensor, analog switches, a reference voltage, a high-resolution

ADC converter and an offset compensation DAC (see Figure 21).

Figure 21 Analog Sensor Interface

The SX9512/12B offers the additional Combined Channel Proximity mode where all sensors are sensed in

parallel.

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Figure 22 Analog Sensor Interface for SX9512/12B, Combined Channel Prox Mode

To get the digital value representing the charge on a specific sensor the ASI will execute several steps. A voltage

will be induced on the sensor developing a charge relative to the absolute capacitance of the sensor. The charge

on a sensor cap (e.g BL0) will then be accumulated multiple times on the internal integration capacitor (Cint). This

results in an increasing voltage on Cint proportional to the capacitance on BL0.

At this stage the offset compensation DAC is enabled. The compensation DAC generates a voltage proportional

to an estimation of the external parasitic capacitance (the capacitance of the system without the calibration).

The difference between the DAC output and the charge on Cint is the desired signal. In the ideal case the

difference of charge will be converted to a zero digital value if no finger is present and the digital value becomes

high in case a finger is present.

The difference of charge on Cint and the DAC output will be transferred to the ADC.

After the charge transfer to the ADC the steps above will be repeated.

The SX9512/12B/13/13B allows setting the sensitivity for each sensor individually for applications which have a

variety of sensors sizes or different overlays or for fine-tuning performances. The optimal sensitivity depends

heavily on the final application. If the sensitivity is too low the digital value will not pass the thresholds and

touch/proximity detection will not be possible. In case the sensitivity is set too large, some power will be wasted

and false touch/proximity information may be output (i.e. for touch buttons => finger not touching yet, for proximity

sensors => finger/hand not close enough).

The digital values from the ASI will then be handled by the digital processing.

The ASI will shut down and wait until new sensing period will start.

3.8.1 Processing

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raw

compensation DCV

ASI processing

low pass

diff

ave

processing

low pass

useful

Figure 23 Processing

The raw data is processed through a programmable low pass filter to create useful data (data with fast

environmental noise suppressed). The useful data is processed through a second programmable low pass filter

(with a longer time constant) to create average data. The average data tracks along with the slow environmental

changes and is subtracted from the useful data to create the diff data. The diff data represents any fast

capacitance changes such as a touch or proximity event.

3.8.2 Offset Compensation

The parasitic capacitance at the BL pins is defined as the intrinsic capacitance of the integrated circuit, the PCB

traces, ground coupling and the sensor planes. This parasitic capacitance is relatively large (tens of pF) and will

also vary slowly over time due to environmental changes.

A finger touch is in the order of one pF and its effect typically occurs much faster than the environmental changes.

The ASI has the difficult task of detecting a small, fast changing capacitance that is riding on a large, slow varying

capacitance. This would require a very precise, high resolution ADC and complicated, power consuming, digital

processing.

The SX9512/12B/13/13B features a 16 bit DAC which compensates for the large, slow varying capacitance

already in front of the ADC. In other words the ADC converts only the desired small signal. In the ideal world the

ADC will put out a zero digital value even if the external capacitance is as high as 40pF.

At each power-up of the SX9512/12B/13/13B the Compensation Values are estimated by the digital processing

algorithms. The algorithm will adjust the compensation values such that a near-zero value will be generated by the

ADC. Once the correct compensation values are found these will be stored and used to compensate each BL pin.

If the SX9512/12B/13/13B is shut down the compensation values will be lost. At a next power-up the procedure

starts all over again. This assures that the SX9512/12B/13/13B will operate under any condition.

However if temperature changes this will influence the external capacitance. The ADC digital values will drift then

slowly around zero values basically because of the mismatch of the compensation circuitry and the external

capacitance.

In case the average value of the digital values become higher than the positive calibration threshold (configurable

by user) or lower than the negative threshold (configurable by user) then the SX9512/12B/13/13B will initiate a

compensation procedure and find a new set of compensation values.

The host can initiate a compensation procedure by using the I2C interface. This is required after the host changes

the sensitivity of sensors.

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3.9 Configuration

Figure 24 shows the building Blocks used for configuring the SX9512/12B/13/13B.

Figure 24 Configuration

During development of a touch system the register settings for the SX9512/12B/13/13B are adjusted until the user

is satisfied with the system operation. When the adjustments are finalized contents of the registers can be stored

in the Multiple Time Programmable (MTP) Non Volatile Memory (NVM). The NVM contains all those parameters

that are defined and stable for the application. Examples are the number of sensors enabled, sensitivity, active

and Sleep scan period. The details of these parameters are described in the next chapters.

At power up or reset the SX9512/12B/13/13B copies the settings from the NVM into the registers.

3.10 Clock Circuitry

The SX9512/12B/13/13B has its own internal clock generation circuitry that does not require any external

components. The clock circuitry is optimized for low power operation.

3.11 I2C interface

The host will interface with the SX9512/12B/13/13B through the I2C bus and the analog output interface.

The I2C of the SX9512/12B/13/13B consists of 95 registers. Some of these I2C registers are used to read the

status and information of the buttons. Other I2C registers allow the host to take control of the

SX9512/12B/13/13B.

The I2C slave implemented on the SX9512/12B/13/13B is compliant with the standard (100kb/s) and fast mode

(400kb/s)

The default SX9512/12B/13/13B I2C address equals 0b010 1011.

3.12 Interrupt

The NIRQ mode of SPO2 has two main functions, the power up sequence and maskable interrupts (detailed

below).

3.12.1 Power up

During power up the NIRQ is kept low (if SPO2 is configured for NIRQ in the NVM). Once the power up sequence

is terminated the NIRQ is cleared autonomously. The SX9512/12B/13/13B is then ready for operation. The AOI

levels are updated at the latest one scan period after the rising edge of NIRQ.

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Figure 25 Power Up vs. NIRQ

During the power on period the SX9512/12B/13/13B stabilizes the internal regulators, RC clocks and the firmware

initializes all registers.

During the power up the SX9512/12B/13/13B is not accessible and I2C communications are forbidden. The value

of NIRQ before power up depends on the NIRQ pull up resistor to the SVDD supply voltage.

3.12.2 NIRQ Assertion

When the NIRQ function is enabled for SPO2 then NIRQ is updated in Active or Sleep mode once every scan

period.

The NIRQ will be asserted at the following events:

• if a Button event occurred (touch or release if enabled)

• a proximity even occurred (prox or loss of prox (SX9512/12B only))

• once compensation procedure is completed either through automatic trigger or via host request

• during reset (power up, hardware NRST, software reset)

3.12.3 Clearing

The clearing of the NIRQ is done as soon as the host performs a read to any of the SX9512/12B/13/13B I2C

registers.

3.12.4 Example

A typical example of the assertion and clearing of the NIRQ and the I2C communication is shown in Figure 26.

Figure 26 Interrupt and I2C

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When a button is touched the SX9512/12B/13/13B will assert the interrupt (1). The host will read the

SX9512/12B/13/13B status information over the I2C (2) and this clears the interrupt.

If the finger releases the button the interrupt will be asserted (3), the host reads the status (4) which clears the

interrupt.

In case the host will not react to an interrupt then this will result in a missing touch.

3.13 Reset

The reset can be performed by 3 sources:

- power up,

- NRST pin,

- software reset.

3.13.1 Power up

During power up the NIRQ is kept low (if SPO2 is configured for NIRQ in the NVM). Once the power up sequence

is terminated the NIRQ is cleared autonomously. The SX9512/12B/13/13B is then ready for operation. The AOI

levels are updated at the latest one scan period after the rising edge of NIRQ.

Figure 27 Power Up vs. NIRQ

During the power on period the SX9512/12B/13/13B stabilizes the internal regulators, RC clocks and the firmware

initializes all registers.

During the power up the SX9512/12B/13/13B is not accessible and I2C communications are forbidden.

As soon as the NIRQ rises the SX9512/12B/13/13B will be ready for I2C communication.

3.13.2 NRST

When NRST is driven low the SX9512/12B/13/13B will reset and start the power up sequence as soon as NRST

is driven high or pulled high.

In case the user does not require a hardware reset control pin then the NRST pin can be connected to SVDD.

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Figure 28 Hardware Reset

3.13.3 Software Reset

To perform a software reset the host needs to write 0xDE at the SoftReset register at address 0xFF.

Figure 29 Software Reset

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3.14 LEDS on BL

The SX9512/12B/13/13B offers eight BL pins that both detect the capacitance change on the touch/prox sensor

and drive the associated LED.

The polarity of the BL pins is defined as in the figure below.

Figure 30 LED between BL and LS pins

The PWM Blocks used in BLP and LED modes are 8-bits based and clocked at 2MHz typ. hence offering 256

selectable pulse width values with a granularity of 0.5us typ.

Figure 31 PWM definition, (a) small pulse width, (b) large pulse width

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LED Fading

The SX9512/12B/13/13B supports two different fading modes, namely Single and Continuous. These fading

modes can be configured for each GPIO individually. Please see “BL Parameters” for more information on how to

configure this feature.

i) Single Fading Mode:

The LED pin fades in when the associated button is touched and it fades out when it is released. This is shown in

Figure 32

fading-in

OFF intensity

ON intensity

delay_off fading-out

OFF intensity

ON

OFF

Figure 32 Single Fading Mode

ii) Continuous Fading Mode:

The LED in and fades out continuously when the associated button is touched. The fading in and out stops when

the button is released. This is shown in Figure 33.

fading-in

OFF intensity

ON intensity

fading-out

OFF intensity

ON

OFF

Figure 33 Continuous Fading Mode

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3.14.1 Intensity index vs. PWM pulse width

Tables below show the PWM pulse width for a given intensity (n) setting (for both linear and log modes).

n

Lin/

Log n

Lin/

Log n

Lin/

Log n

Lin/

Log n

Lin/

Log n

Lin/

Log n

Lin/

Log n

Lin/

Log

0

0/0

32

33/5

64

65/12

96

97/26

128

129/48

160

161/81

192

193/125

224

225/184

1

2/0

33

34/5

65

66/13

97

98/27

129

130/49

161

162/82

193

194

/127

225

226/186

2

3/0

34

35/5

66

67/13

98

99/27

130

131/50

162

163/83

194

195/129

226

227/188

3

4/0

35

36/5

67

68/13

99

100/28

131

132/51

163

164/84

195

196/130

227

228/190

4

5/0

36

37/5

68

69/14

100

101/29

132

133/52

164

165/86

196

197/132

228

229/192

5

6/2

37

38/6

69

70/14

101

102/29

133

134/53

165

166/87

197

198/133

229

230/194

6

7/2

38

39/6

70

71/14

102

103/30

134

135/54

166

167/88

198

199/135

230

231/197

7

8/2

39

40/6

71

72/15

103

104/30

135

136/55

167

168/89

199

200/137

231

232/199

8

9/2

40

41

/6

72

73/15

104

105/31

136

137/55

168

169/91

200

201/139

232

233/201

9

10/2

41

42/6

73

74/15

105

106/32

137

138/56

169

170/92

201

202/140

233

234/203

10

11/2

42

43/7

74

75/16

106

107/32

138

139/57

170

171/93

202

203/142

234

235/205

11

12/2

43

44/7

75

76

/16

107

108/33

139

140/58

171

172/95

203

204/144

235

236/208

12

13/2

44

45/7

76

77/16

108

109/33

140

141/59

172

173/96

204

205/146

236

237/210

13

14/2

45

46/7

77

78/17

109

110/34

141

142/60

173

174/97

205

206/147

237

238/212

14

15/3

46

47/7

78

79/17

110

111/35

142

143/61

174

175/99

206

207/149

238

239/215

15

16/3

47

48/8

79

80/18

111

112/35

143

144/62

175

176/100

207

208/151

239

240/217

16

17/3

48

49/8

80

81/18

112

113/36

144

145/63

176

177/101

208

209/153

240

241/219

17

18/3

49

50/8

81

82/19

113

114/

37

145

146/64

177

178/103

209

210/155

241

242/221

18

19/3

50

51/8

82

83/19

114

115/38

146

147/65

178

179/104

210

211/156

242

243/224

19

20/3

51

52/9

83

84/20

115

116/38

147

148/66

179

180/106

211

212/158

243

244/226

20

21/3

52

53/9

84

85/20

116

117/39

1

48

149/67

180

181/107

212

213/160

244

245/229

21

22/3

53

54/9

85

86/21

117

118/40

149

150/68

181

182/109

213

214/162

245

246/231

22

23/3

54

55/9

86

87/21

118

119/40

150

151/69

182

183/110

214

215/164

246

247/233

23

24/4

55

56/10

87

88/22

119

120/41

151

152/71

183

184/111

215

216/166

247

248/236

24

25/4

56

57/10

88

89/22

120

121/42

152

153/72

184

185/113

216

217/168

248

249/238

25

26/4

57

58/10

89

90/23

121

122/43

153

154/73

185

186/114

217

218/170

249

250/241

26

27/4

58

59/10

90

91/23

122

123/44

154

1

55/74

186

187/116

218

219/172

250

251/243

27

28/4

59

60/11

91

92/24

123

124/44

155

156/75

187

188/117

219

220/174

251

252/246

28

29/4

60

61/11

92

93/24

124

125/45

156

157/76

188

189/119

220

221/176

252

253/248

29

30/4

61

62/11

93

94/25

125

126/46

157

15

8/77

189

190/121

221

222/178

253

254/251

30

31/4

62

63/12

94

95/25

126

127/47

158

159/78

190

191/122

222

223/180

254

255/253

31

32/5

63

64/12

95

96/26

127

128/48

159

160/80

191

192/124

223

224/182

255

256/256

Table 7 Intensity index vs. PWM pulse width (normal polarity)

Recommended/default settings are inverted polarity (to take advantage from high sink current capability) and

logarithmic mode (due to the non-linear response of the human eye).

3.14.2 LED Triple Reporting

The button information touch and release can be reported on the LEDs in dual mode (ON and OFF).

The proximity information can be shown using the dual mode by attributing a dedicated LED to the proximity

sensor. The LED will show then proximity detected or no proximity detected. The fading principles are equal to the

fading of sensors defined as buttons as described in the previous sections.

In triple mode proximity is reported on all LEDs by an intermediate LED intensity.

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Figure 34 LEDs in triple reporting mode proximity

Figure 34 shows an example of proximity detection and the reporting on LEDs. As soon as proximity is detected

all LEDs (2 LEDs are shown for simplicity) will fade in and stop at the proximity intensity level. In case proximity is

not detected anymore then the LEDs remain at the proximity intensity for a configurable time and then the fading

out will start.

Figure 35 LEDs in triple reporting mode proximity and touch

Figure 35 shows an example of proximity detection followed by a rapid touch on the sensor sd1.

The LEDs d1 and d2 will fade in as soon as proximity is detected (using the Inc_Prox parameter).

As soon as the finger touches the sensor sd1 the fading in of d1 will go to the ON intensity (using the touch

increment parameter).

The LED d2 remains at the proximity intensity level as sensors sd2 is not touched.

If the finger is removed rapidly the fading out of d1 will first use the touch decrement parameter to the proximity

intensity level. If the finger leaves the proximity region d1 and 2 will fade out simultaneously using the proximity

delay and decrement parameters.

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4 D

ETAILED

C

ONFIGURATION DESCRIPTIONS

4.1 Introduction

The SX9512/12B/13/13B configuration parameters are taken from the NVM and loaded into the registers at

Power-Up or upon reset.

The registers are split by functionality into configuration sections:

• General section: operating modes,

• Capacitive Sensors section: related to lower level capacitive sensing,

• LED

• Special Purpose Outputs

• Buzzer

• System (Reserved)

The address space is divided up into areas that are (can be) stored in NVM and areas that are dynamic and not

stored.

Within the register address space are values designated as ‘Reserved’. These values can be disregarded when

reading but bust be set to the specified values when writing.

Address

Name

Address

Name

0x00

General Control and Status

IrqSrc

“NVM” area

0x38

Cap sensing

CapSenseStuck

0x01

TouchStatus

0x39

CapSenseFrameSkip

0x02 ProxStatus 0x3A CapSenseMisc

0x03 CompStatus 0x3B ProxCombChanMask

0x04

NVMCtrl

0x3C

Reserved

0x05

Reserv

ed

0x3D

Reserved

0x06 Reserved 0x3E

Special output

SPOChanMap

“NVM” area

0x07 Spo2Mode 0x3F SPOLevelBL0

0x08

PwrKey

0x40

SPOLevelBL1

0x09

IrqMask

0x41

SPOLevelBL2

0x0A Reserved 0x42 SPOLevelBL3

0x0B Reserved 0x43 SPOLevelBL4

0x0C

LED control

LEDMap1

0x44

SPOLevelBL5

0x0D

LEDMap2

0x45

SPOLevelBL6

0x0E LEDPwmFreq 0x46 SPOLevelBL7

0x0F LEDMode 0x47 SPOLevelIdle

0x10

LEDIdle

0x48

SPOLevelProx

0x11

LEDOffDelay

0x49

Reserved

0x12 LED1On 0x4A Reserved

0x13 LED1Fade 0x4B

Buzzer

BuzzerTrigger

0x14

LED2On

0x4C

BuzzerFreq

0x15

LED2Fade

0x4D

Reserved

0x16 LEDPwrIdle 0x4E

Reserved

0x17 LEDPwrOn 0x4F Reserved

0x18

LEDPwrOff

0x50

Reserved

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0x19

LEDPwrFade

0x51

Reserved

0x1A

LEDPwrOnPw

0x52

Reserved

0x1B LEDPwrMode 0x53 Reserved

0x1C Reserved 0x54 Reserved

0x1D

Reserved

0x55

Reserved

0x1E

Cap sensing

CapSenseEnable

0x56

Reserved

0x1F CapSensRange0 0x57 Reserved

0x20 CapSenseRange1 0x58 Reserved

0x21

CapSenseRange2

0x59

Reserved

0x22

CapSenseRange3

0x5A

Reserved

0x23 CapSenseRange4 0x5B Reserved

0x24 CapSenseRange5 0x5C Reserved

0x25

CapSenseRange6

0x5D

Reserved

0x26

CapSenseRange7

0x

5E

Reserved

0x27 CapSenseRangeAll 0x5F Reserved

0x28 CapSenseThresh0 0x60 Reserved

0x29

CapSenseThresh1

0x61

Reserved

0x2A

CapSenseThresh2

0x62

Reserved

0x2B CapSenseThresh3

0x63

Sensor readback

CapSenseChanSelect

0x2C CapSenseThresh4 0x64 CapSenseUsefulDataMsb

0x2D

CapSenseThresh5

0x65

CapSenseUsefulDataLsb

0x2E

CapSenseThresh6

0x66

CapSenseAverageDataMsb

0x2F CapSenseThresh7 0x67 CapSenseAverageDataLsb

0x30 CapSenseThreshComb 0x68 CapSenseDiffDataMsb

0x31

CapSenseOp

0x69

CapSenseDiffDataLsb

0x32

CapSenseMode

0x6A

CapSenseCompMsb

0x33 CapSenseDebounce 0x6B CapSenseCompLsb

0x34 CapSenseNegCompThresh 0x6C

Reserved

0x35

CapSensePosCompThresh

…

0x36

CapSensePosFilt

0xFE

Reserved

0x37 CapSenseNegFilt 0xFF I2CSoftReset

Table 8 Register Map

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4.2 General Control and Status

4.2.1 Interrupt Source

Address

Name

Acc

Bits

Field

Function

0x00 IrqSrc R/W

7:0 Irq

Source Indicate active Irqs

0 : Irq inactive

1 : Irq active

Bit map

7 : Reset

6 : Touch

5 : Release

4 : Near (Prox on)

3 : Far (Prox off)

2 : Compensation done (Write a 1 to this bit to trigger a

compensation on all channels)

1 : Conversion done.

0 : Reserved, will read 0

The Irq Source register will indicate that the specified event has occurred since the last read of this register. If the

NIRQ function is selected for SPO2 then it will indicate the occurrence of any of these events that are not masked

out in register 0x09.

The Irq mask in register 0x09 will prevent an Irq from being indicated by the NIRQ pin but it will not prevent the

IRQ from being noted in this register.

4.2.2 Touch Status

Address

Name

Acc

Bits

Field

Function

0x01

TouchStatus

R

7:0

Touch Status

Indicates

touch detected on indicated BL channel.

Bit 7 = BL7 … Bit 0 = BL0

0 : No touch detected

1 : Touch detected

The Touch Status register will indicate when a touch occurs on one of the BL channels. A touch is indicated when

a channels DiffData value goes at least the Hyst value above its threshold level for debounce number of

consecutive measurement cycles. A touch is lost when a channels DiffData value goes at least Hyst value below

it’s threshold for debounce number of measurement cycles. This is a dynamic read only regester that is not stored

in NVM.

Example: BL2 is set to a threshold of 400 (0x21 = 0x19), a Hyst of 8 (0x37 [7:5] = 3’b001), a touch debounce of 0

(0x33 [3:2] = 2’b00) and a release debounce of 2 (0x33 [1:0] = 2’b01).

A touch will be indicated the first measurement cycle that the DiffData goes above 408 and the touch will be lost

when the DiffData value goes below 392 on two successive measurement cycles.

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4.2.3 Proximity Status

Address

Name

Acc

Bits

Field

Function

0x02 ProxStatus

R 7 ProxBL0 Indicates proximity detected on BL0

0 : No Proximity detected

1 : Proximity detected

(if Prox on BL0 enabled (0x31[6]))

R

6

ProxMulti

Indicates proximity detected on combined channels

0 : No Proximity detected

1 : Proximity detected

(if Prox on combined channels enabled (0x31[5])

and channels enabled for use (0x3B))

R 5 ProxMulti Comp

Pending Indicates compensation pending for combined

channel Prox sensing

0 : Compensation not pending

1 : Compensation pending

(if Prox on combined channels enabled (0x31[5])

and channels enabled for use (0x3B))

R 4:0 Reserved Reserved, will read 00000

The ProxBL0 bit will indicate Proximity detected on the BL0 pin, The ProxMulti bit will indicate proximity on the

Combined Channels and the ProxMulti Comp Pending bit will indicate that a compensation has been requested

for the Combined Channels and is pending. (for SX9512/12B and if enabled),

4.2.4 Compensation Status

Address

Name

Acc

Bits

Field

Function

0x03 CompStatus

R 7:0 Comp

Pending Indicates compensation pending on indicated BL channel.

Bit 7 = BL7 … Bit 0 = BL0

0 : Compensation not pending

1 : Compensation pending

The Comp Pending register indicates which pins from BL0 to BL7 have compensations requested and pending.

4.2.5 NVM Control

Address

Name

Acc

Bits

Field

Function

0x04

NVMCtrl

R/W

7:4

NVM Burn

Write 0x50 followed by 0xA0 to initiate transfer of

reg 0x07 through 0x62 to NVM

R/W

3 NVM Read Trigger NVM read.

0 : Do nothing

1 : Read contents of current active NVM area into

registers

R 2:0 NVM Area Indicates current active NVM area

000 : no areas are programmed.

001 : User1 area is programmed and in use.

011 : User2 area is programmed and in use.

111 : User3 area is Programmed and in use.

The NVM Area field indicates which of the user NVM areas are currently programmed and active (1, 2 or 3). The

NVM Read bit gives the ability to manually request that the contents of the NVM be transferred to the registers

and NVM Burn field gives the ability to burn the current registers to the next available NVM area.

Normally, the transfer of data from the NVM to the registers is done automatically on power up and upon a reset

but occasionally a user might want to force a read manually.

Registers 0x07 through 0x62 are stored to NVM and loaded from NVM.

After writing 0xA0 (ie NVM burn), wait for at least 500ms and then power off-on the IC for changes to be effective.

Caution, there are only three user areas and attempts to burn values beyond user area 3 will be ignored.

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4.2.6 SPO2 Mode Control

Address

Name

Acc

Bits

Field

Function

0x07 Spo2Mode

R/W

7 Reserved Reserved, set to 0

R/W

6:5

SPO2 Config

Set function of SPO2 pi

n

00 : Pin is open drain NIRQ

01 : Pin drives Buzzer (see registers 0x4B and 0x4C)

10 : Pin is Analog Output 2

11 : TV Power State input (see registers 0x07[4] and

0x1B[7])

R/W

4

TV Power

State

If SPO2 set to TV Power State input then TV power state

indicated by this bit,

if SPO2 set to other function then Host writes this bit to

indicate current TV Power State.

0 : Off

1 : On

R/W

3:0

Reserved

Reserved, set to 0000

The SPO2 Config field will specify the functionality of the SPO pin. When selected as NIRQ, the open drain output

will go low whenever a non-masked Irq occurs and the NIRQ will go back high after a register 0x00 is read over

the I2C. When selected as Buzzer, the SPO2 pin will drive a 2 phase 2 frequency signal onto an external buzzer

for each specified event (see Buzzer section). When selected as SPO2, pin operates as an analog output similar

to SPO1 (see SPO section). If selected as TV power state, the pin is driven from the system PMIC with a high

(SPO2 = SVDD) indicating that the system power is on and a low (SPO2 = GND) when the system power is off.

The TV Power State bit reads back the current state of SPO2 if SPO2 is selected for TV power state, otherwise

the system should write to this bit to indicate the current system power state. The SX9512/12B/13/13B needs to

know the current state in able to correctly process some of the LED modes for the Power Button (see LED

modes).

4.2.7 Power Key Control (for generation of PWRON signal)

Address

Name

Acc

Bits

Field

Function

0x08 PwrKey R/W

7:0 Power Keys Set which BL sensors will trigger a PowerOn pulse

when touched.

Bit 7 = BL7 … Bit 0 = BL0

0 : Do not use channel

1 : Use channel

If BL7 is enabled (0x1B[1]), it will be the main power

button with respect to power button LED functions

(see reg 0x16 through 0x1B)

The Power Keys field is a map that indicates which of the BL0 through BL7 channels should trigger a pulse on the

PWRON pin when touched. This should not be confused with the BL7 Power Key enable bit as described in

register 0x1B.

4.2.8 Interrupt Request Mask

Address

Name

Acc

Bits

Field

Function

0x09 IrqMask R/W

7:0 Irq Mask Set which Irqs will be trigger an NIRQ (if enabled on

SPO2) and report in reg 0x00

0 : Disable Irq

1 : Enable Irq

Bit map

7 : Reset

6 : Touch

5 : Release

4 : Near (Prox on)

3 : Far (Prox off)

2 : Compensation done

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1 : Reserved, set to 0

0 : Reserved, set to 0

The Irq Mask field determines which Irq events will trigger an NIRQ signal on SPO2 if SPO2 is set to the NIRQ

function.

4.2.9 I2C Soft Reset

Address

Name

Acc

Bits

Fi

eld

Function

0xFF I2CSoftReset W 7:0 I2C Soft Reset Write 0xDE followed by 0x00 to

reset

Trigger a device reset and NVM re-load by writing 0xDE followed by 0x00 to this register.

4.3 LED Control

4.3.1 LED Map for Engine 1 and 2

Address

Name

Acc

Bits

Field

Functi

on

0x0C

LEDMap1

R/W

7:0

LED Engine

Map 1

Assign indicated BL channel to LED engine 1

Bit 7 = BL7 … Bit 0 = BL0

0 : Do not assign to LED engine 1

1 : Assign to LED engine 1

0x0D

LEDMap2

R/W

7:0

LED Engine

Map 2

Assign indicated BL channel to LED engine 2

Bit 7 = BL7 … Bit 0 = BL0

0 : Do not assign to LED engine 2

1 : Assign to LED engine 2

Write a 1 for each bit (7 through 0) into the LED Engine Map 1 field for each channel (BL7 through BL0) that will

be driven by LED Engine 1.

Write a 1 for each bit (7 through 0) into the LED Engine Map 2 field for each channel (BL7 through BL0) that will

be driven by LED Engine 2.

In most cases each BL channel will only be assigned to one of the engines but there are some rare cases where a

channel will be assigned to both.

4.3.2 LED PWM Frequency

Address

Name

Acc

Bits

Field

Function

0x0E

LEDPwmFreq

R/W

7:0

LED PWM Frequency

LEDPWMfreq =

2MHz

/ n

The LED PWM frequency is derived from the 2MHz oscillator and is the primary method for controlling the BL7

through BL0 frame scanning rate as well as impacting the maximum brightness achievable on each LED and

impacting the smoothness of the LED illumination (flicker prevention).

As displayed in Figure 6, the CapSense measurements and LED PWM drive is time multiplexed. The CapSense

measurement time is nominally 648us and the LED PWM time is 255 LED clocks long. The LED refresh frequency

must be above 50/60Hz to ensure that there is not a noticeable flicker on the LEDs. So we have:

LED max brightness = 255/(648us * LEDPwmFreq + 255)

LED refresh frequency = 1 / (648us + 255/LEDPwmFreq)

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4.3.3 LED Mode

Address

Name

Acc

Bits

Field

Function

0x0F LEDMode R/W

7:4 LED Fade Repeat Set number of fade in/out repeats when in LED

Repeat X low and Repeat X high modes (see

reg 0x0F[1:0])

R/W

3 Reserved Reserved, set to 0

R/W

2 LED Fading Set LED fade in and fade out type

0 : linear

1 : log

R/W

1:0 LED Mode Set LED mode of operation

00 : Single shot

01 : Repeat continuous

10 : Repeat X low

11 : Repeat X high

4.3.4 LED Idle Level

Address

Name

Acc

Bits

Field

Function

0x10

LEDIdle

R/W

7:0

LED Engine 1 & 2 Idle

Level

Set LED engine 1 and LED engine 2 idle

intensity level.

4.3.5 LED Off Delay

Address

Name

Acc

Bits

Field

Function

0x11

LEDOffDelay

R/W

7:4

LED Engine 1 Delay Off

Time

Set time delay from l

oss of touch/prox to start

of fade out.

Delay = n * 256ms

R/W

3:0 LED Engine 2 Delay Off

Time Set time delay from loss of touch/prox to start

of fade out.

Delay = n * 256ms

4.3.6 LED Engine 1 On Level

Address

Name

Acc

Bits

Field

Function

0x12

LED1On

R/W

7

:0

LED Engine 1 on Level

Set LED engine 1 on intensity

level.

4.3.7 LED Engine 1 Fade In/Out Timing

Address

Name

Acc

Bits

Field

Function

0x13

LED1Fade

R/W

7:4

LED engine 1 Fade In

Time

Set time per intensity step when changing from

idle to on, idle to prox or prox to on states.

StepTime = (n + 1) * 500us

The total time required to change from one level

to another will be:

ChangeTime = abs(CurrLevel - NewLevel) *

StepTime

R/W

3:0 LED engine 1 Fade Out

Time Set time per intensity step when changing from

on to idle, on to prox or prox to idle states.

StepTime = (n + 1) * 500us

The total time required to change from one level

to another will be:

ChangeTime = abs(CurrLevel - NewLevel) *

StepTime

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Proximity Controller with Analog Outputs

4.3.8 LED Engine 2 On Level

Address

Name

Acc

Bits

Field

Function

0x14 LED2On R/W 7:0 LED Engine 2 on Level Set LED engine 2 on intensity level.

4.3.9 LED Engine 2 Fade In/Out Timing

Address

Name

Acc

Bits

Field

Function

0x15 LED2Fade

R/W

7:4 LED engine 2 Fade In

Time Set time per intensity step when changing from

idle to on, idle to prox or prox to on states.

StepTime = (n + 1) * 500us

The total time required to change from one level

to another will be:

ChangeTime = abs(CurrLevel - NewLevel) *

StepTime

R/W

3:0

LED engine 2 Fade Out

Time

Set time per intensity step when chang

ing from

on to idle, on to prox or prox to idle states.

StepTime = (n + 1) * 500us

The total time required to change from one level

to another will be:

ChangeTime = abs(CurrLevel - NewLevel) *

StepTime

4.3.10 LED Power Button Idle Level

Address

Name

Acc

Bits

F

ield

Function

0x16

LEDPwrIdle

R/W

7:0

Power Button LED Idle

Level

Set Power button LED engine idle intensity

level.

4.3.11 LED Power Button On Level

Address

Name

Acc

Bits

Field

Function

0x17 LEDPwrOn R/W

7:0 Power Button LED On

Level Set Power button LED engine on intensity

level.

4.3.12 LED Power Button Off Level

Address

Name

Acc

Bits

Field

Function

0x18 LEDPwrOff

R/W

7:0 Power Button LED Off Level

Set Power button LED engine off intensity

level.

4.3.13 LED Power Button Fade In/Out Timing

Address

Name

Acc

Bits

Fiel

d

Function

0x19 LEDPwrFade

R/W

7:0 Power Button Fade

In/Out Time Set time per intensity step when changing from

one level to another.

StepTime = (n + 1) * 250us

The total time required to change from one

level to another will be:

ChangeTime = abs(CurrLevel - NewLevel) *

StepTime

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4.3.14 Power-On Pulse width

Address

Name

Acc

Bits

Field

Function

0x1A LEDPwrOnPw

R/W

7:0 Power On Pulse

Width Set the duration of both the power on pulse

driven on the PWRON pin and the power LED

on time in breath idle power mode.

PowerOnPw = (n + 1) * 1ms

The power on pulse is triggered by either the

power button (if power button enabled

(0x1B[1]))

4.3.15 LED Power Button Mode

Address

Name

Acc

Bits

Field

Function

0x1B LEDPwrMode

R/W

7 Power LED Off Mode Enable off sequence based on TV power

state (0x07[4])

0 : Switch from idle to breathing

1 : Switch from idle (0x16) to Power LED

max (0x1B[5] and 0x17) for Power On PW

time (0x1A) before switching to breathing if

TV Power State = 1 (0x07[4])

R/W

6

Power LED Max Level

Set Power LED max

level to be used during

power up and power down sequences

0 : Max set to Power Button LED On Level

1 : Max set to 255

R/W

5

Power LED Breath Max

Set which level to use as high level while

breathing

0 : Breathing swings between LED power

button off level (0x18) and LED power

button idle level (0x16)

1 : Breathing swings between LED power

button off level (0x18) and LED power

button on level (0x17)

R/W

4

Power LED Waveform

Set Power LED waveform type

0 : Breath idle mode, power LED goes from

idle to breathing, breathes for Power On Pw

time and then goes back to idle

1 : Breath idle mode, power LED goes from

breathing to Power LED max for Power On

Pw time and then goes to idle

R/W

3 Reserved Reserved: set to 0

R/W

2 Reserved Reserved: set to 0

R/

W

1

Power Button EN

Enable BL7 as power button

0 : BL7 is normal button

1 : BL7 is power button

R/W

0 LED Touch Polarity

Invert Invert the polarity of the LED touch on level

0 : LED on level = programmed on level

1 : LED on level = 255 - programmed on

level

Effects touch on level only, not idle or prox

levels.

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4.4 CapSense Control

4.4.1 CapSense Enable

Address

Name

Acc

Bits

Field

Function

0x1E CapSenseEnable

R/W

7:0 Cap Sense EN Set which BL sensors are

enabled

Bit 7 = BL7 … Bit 0 = BL0

0 : Disabled

1 : Enabled

4.4.2 CapSense 0 through 7 (and Combined Channel Mode) Delta Cin range and LS Control

Address

Name

Acc

Bits

Field

Function

0x1F CapSensRange0 R/W

7:6 LS Control LS usage during measurements for BL0

00 : LS high-Z (off)

01 : dynamically driven with measurement

signal (preferred)

10 : LS tied to GND

11 : LS tied to an internal Vref

R/W

5:2 Reserved Reserved, set to 0000

R/W

1:0

Delta Cin

Range

For BL0

00 : +/-7pF

01 : +/-3.5pF

10 : +/-2.8pF

11: +/-2.3pF

0x20 CapSenseRange1 R/W

7:0 Same as CapSensRange0 but for BL1

0x21

CapSenseRange2

R/W

7:0

Same as CapSensRange0 but for BL2

0x22 CapSenseRange3 R/W

7:0 Same as CapSensRange0 but for BL3

0x23

CapSenseRange4

R/W

7:0

Same as CapSensRange0 but for BL4

0x24 CapSenseRange5 R/W

7:0 Same as CapSensRange0 but for BL5

0x25

CapSenseRange6

R/W

7:0

Same as CapSensRange0 but for BL6

0x26 CapSenseRange7 R/W

7:0 Same as CapSensRange0 but for BL7

0x27

CapSenseRangeAll

R/W

7:0

Same as CapSensRange0 but for combined

channels used as a prox sensor

4.4.3 CapSense 0 through 7 (and Combined Channel Mode) Detection Threshold

Address

Name

Acc

Bits

Field

Function

0x28

CapSenseThresh0

R/W

7:0

Touch Detection Threshold

BL0

Set the touch/prox detection

threshold for BL0.

Threshold = n * 16

0x29

CapSenseThresh1

R/W

7

:0

Touch Detection Threshold

BL1

Same as CapSenseThresh0

but for BL1

0x2A CapSenseThresh2 R/W

7:0 Touch Detection Threshold

BL2 Same as CapSenseThresh0

but for BL2

0x2B CapSenseThresh3 R/W

7:0 Touch Detection Threshold

BL3 Same as CapSenseThresh0

but for BL3

0x2C

CapSenseThresh4

R/W

7:0

Touch Detection Threshold

BL4

Same as CapSenseThresh0

but for BL4

0x2D

CapSenseThresh5

R/W

7:0

Touch Detection Threshold

BL5

Same as CapSenseThresh0

but for BL5

0x2E CapSenseThresh6 R/W

7:0 Touch Detection Threshold

BL6 Same as CapSenseThresh0

but for BL6

0x2F

CapSenseThresh7

R/W

7:0

Touch Detection Threshold

BL7

Same as CapSenseThresh0

but for BL7

0x30

CapSenseThreshComb

R/W

7:0

Touch Detection Threshold

Combined

Same as CapSenseThresh0

but for combined channels

used as a prox sensor

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9512/

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8 Capacitive Buttons, LEDs and

Proximity Controller with Analog Outputs

4.4.4 CapSense Auto Compensation, Proximity on BL0 and Combined Channels Proximity Enable

Address

Name

Acc

Bits

Field

Function

0x31 CapSenseOp R/W

7 Auto Compensation 0 : Enable automatic

compensation

1 : Disable automatic

compensation

R/W

6 Proximity BL0 0 : BL0 is normal button

1 : BL0 is proximity sensor

R/W

5 Proximity Combined

Channels 0 : Do not use combined

channels for proximity sensing

1 : Use combined channels

(0x3B) for proximity sensing

R/W

4:0 Reserved Reserved, set to 10100

4.4.5 CapSense Raw Data Filter Coef, Digital Gain, I2C touch reporting and CapSense reporting

Address

Name

Acc

Bits

Field

Function

0x32

CapSenseMode

R/W

7:5

Raw Filter

filter coefficient to turn raw data into

useful data

000 : off

001 : 1-1/2

010 : 1-1/4

011 : 1-1/8

100 : 1-1/16

101 : 1-1/32

110 : 1-1/64

111 : 1-1/128

R/W

4 Touch Reporting

(I2C) Set which touches will be reported in

Touch Status (0x01)

0 : Report touches according to

CapSense Report Mode (0x32[1:0])

1 : Report all touches

R/W

3:2

Cap

Sense Digital

Gain

Set digital gain factor

00 : No gain, Delta Cin Range = Delta

Cin Range

01 : X2 gain, Delta Cin Range = Delta

Cin Range / 2

10 : X4 gain, Delta Cin Range = Delta

Cin Range / 4

11 : X8 gain, Delta Cin Range = Delta

Cin Range / 8

Delta Cin outside of range will saturate.

R/W

1:0

CapSense Report

Mode

Set mode for Reporting touches on LEDs

(and in reg 0x01 if 0x32[4] = 0)

00 : Single, only report the first touch

01 : Strongest, report the strongest touch

10 : Double, report the first touch for a BL

assigned to LED engine 1 and the first

touch for a BL assigned to LED engine 2

11 : Double LED, report the first two

touches for each LED engine but the

second touch goes directly from idle to

on or on to idle with no fading

Note: When prox detection is enabled,

LED engine 1 is dedicated to the prox

function and that limits these modes to

LED engine 2.

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Proximity Controller with Analog Outputs

4.4.6 CapSense Debounce

Address

Name

Acc

Bits

Field

Function

0x33

CapSenseDebounce

R/W

7:6

CapSense Prox Near

Debounce

Set number of consecutive

samples that proximity detection

must be true before proximity is

indicated on LEDs and in register

0x02

00 : Debouncer off, proximity

indicated on first sample

01 : 2 samples

10 : 4 samples

11 : 8 samples

R/W

5:4 CapSense Prox Far

Debounce Set number of consecutive

samples that proximity detection

must be false before los of

proximity is indicated on LEDs and

in register 0x02

00 : Debouncer off, loss of

proximity indicated on first sample

01 : 2 samples

10 : 4 samples

11 : 8 samples

R/W

3:2 CapSense Touch

Debounce Set number of consecutive

samples that touch detection must

be true before touch is indicated on

LEDs and in register 0x01

00 : Debouncer off, touch indicated

on first sample

01 : 2 samples

10 : 4 samples

11 : 8 samples

R/W

1:0 CapSense Release

Debounce Set number of consecutive

samples that touch detection must

be false before release is indicated

on LEDs and in register 0x01

00 : Debouncer off, release

indicated on first sample

01 : 2 samples

10 : 4 samples

11 : 8 samples

4.4.7 CapSense Negative Auto Compensation Threshold

Address

Name

Acc

Bits

Field

Function

0x34 CapSenseNegCompThresh

R/W

7:0 CapSense Neg Comp

Thresh Set negative level that

average data must cross

before triggering a negative

drift auto compensation.

Threshold = n * 128

Should not be set below 0x40.

4.4.8 CapSense Positive Auto Compensation Threshold

Address

Name

Acc

Bits

Field

Function

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8 Capacitive Buttons, LEDs and

Proximity Controller with Analog Outputs

0x35 CapSensePosCompThresh

R/W

7:0 CapSense Pos Comp

Thresh Set positive level that average

data must cross before

triggering a positive drift auto

compensation.

Threshold = n * 128

Should not be set below 0x40.

4.4.9 CapSense Positive Filter Coef, Positive Auto Compensation Debouce and Proximity Hyst

Address

Name

Acc

Bits

Field

Function

0x36

CapSensePosFilt

R/W

7:5

CapSense Prox Hyst

Set Proximity de

tection/loss

hysteresis

000 : 2

001 : 8

010 : 16

011 : 32

100 : 64

101 : 128

110 : 256

111 : 512

Prox detection when Delta Data >=

(Prox Thresh + Prox Hyst), Prox lost

when Delta Data <= (Prox Thresh -

Prox Hyst)

R/W

4:3 CapSense Pos Comp

Debounce Set number of consecutive samples

that average data is above the

positive compensation threshold

before a compensation is triggered

00 : Debouncer off, compensation

triggered on first sample

01 : 2 samples

10 : 4 samples

11 : 8 samples

R/W

2:0 CapSense Ave Pos Filt

Coef Set filter coefficient for turning positive

useful data into average data

000 : Off, no averaging of positive

data

001 : 1-1/2

010 : 1-1/4

011 : 1-1/8

100 : 1-1/16

101 : 1-1/32 (suggested)

110 : 1-1/64

111 : 1-1/128

4.4.10 CapSense Negative Filter Coef, Negative Auto Compensation Debounce and Touch Hyst

Address

Name

Acc

Bits

Field

Function

0x37

CapSenseNegFilt

R/W

7:5

CapSense Touch Hyst

Set touch detection/loss hys

teresis

000 : 2

001 : 8

010 : 16

011 : 32

100 : 64

101 : 128

110 : 256

111 : 512

Touch detection when Delta Data

>= (Touch Thresh + Touch Hyst),

Touch lost when Delta Data <=

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(Touch Thresh - Touch Hyst)

R/W

4:3

CapSense Neg Comp

Debounce

Set number of consecutive

samples that average data is below

the negative compensation

threshold before a compensation is

triggered

00 : Debouncer off, compensation

triggered on first sample

01 : 2 samples

10 : 4 samples

11 : 8 samples

R/W

2:0 CapSense Ave Neg Filt Coef Set filter coefficient for turning

negative useful data into average

data

000 : Off, no averaging of positive

data

001 : 1-1/2

010 : 1-1/4 (suggested)

011 : 1-1/8

100 : 1-1/16

101 : 1-1/32

110 : 1-1/64

111 : 1-1/128

4.4.11 CapSense Stuck-at Timer and Periodic Compensation Timer

Address

Name

Acc

Bits

Field

Function

0x38 CapSenseStuck

R/W

7:4 CapSense Stuck at

Timer Set stuck at timeout timer. If touch lasts

longer than timer, touch is disqualified and a

compensation is triggered.

0000 : Off

00bb : Timeout = bb * FrameTime * 64

01bb : Timeout = bb * FrameTime * 128

1bbb : Timeout = bbb * FrameTime * 256

FrameTime = (CapSense time + LED Frame

time) * 9

CapSense time = 648us

LED Frame time = 255 / LED Frequency

(0x0E)

R/W

3:0

CapSense Periodic

Comp

Set periodic compensation interval

0000 : Off, no periodic compensations

bbbb : Periodic compensation triggered every

bbbb * 128 frames

FrameTime = (CapSense time + LED Frame

time) * 9

CapSense time = 648us

LED Frame time = 255 / LED Frequency

(0x0E)

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4.4.12 CapSense Frame Skip setting fro Active and Sleep

Address

Name

Acc

Bits

Field

Function

0x39

CapS

enseFrameSkip

R/W

7:4

CapSense Active Frame

Skip

Set number of frames to skip

measuring BL pins between frames

that do measure the BL pins in

active mode. Timing and LED drive

remains constant.

Frames to skip = n

R/W

3:0

CapSense Sleep Frame

Skip

Set nu

mber of frames to skip

measuring BL pins between frames

that do measure the BL pins in sleep

mode. Timing and LED drive

remains constant.

Frames to skip = n * 4

4.4.13 CapSense Sleep Enable, Auto Compensation Channels Threshold, Inactive BL Control

Address

Name

Acc

Bits

Field

Function

0x3A CapSenseMisc

R/W

7:6 Reserved Reserved, set to 00

R/W

5:4 Comp Chan Num Thresh Set how many channels must request

compensation before a compensation is

done on all channels.

00 : Each channel is compensated

individually when compensation is

requested for that channel

bb : Compensation for all channels is

triggered when bb channels request

compensation

R/W

3

CapSense Sleep Mode

Enable

0 : Disable sleep mode

1 : Enable sleep mode

R/W

2

Reserved

Reserved, set to 0

R/W

1:0 CapSense Inactive BL

Mode Set what is done with BL pins when other

BL pins are being measured.

00 : Inactive BLs are driven to LS levels

01 : Inactive BLs are driven to LS levels

10 : Inactive BLs are HiZ

11 : Inactive BLs are connected to GND

4.4.14 Proximity Combined Channel Mode Channel Mapping

Address

Name

Acc

Bits

Field

Function

0x3B ProxCombChanMask

R/W

7:0 Prox Combined Chan

Mask Assign indicated BL channel to be

used in combined channel mode for

proximity detection

Bit 7 = BL7 … Bit 0 = BL0

0 : Do not use in combined channel

mode

1 : Use in combined channel mode

4.5 SPO Control

4.5.1 SPO Channel Mapping

Address

Name

Acc

Bits

Field

Function

0x3E SPOChanMap

R/W

7:0 SPO Channel

Mapping Assign each BL pin to report touches on either

SPO1 or SPO2.

Bit 7 = BL7 … Bit 0 = BL0

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0 : Report touches on SPO1

1 : Report touches on SPO2

4.5.2 SPO Analog Output Levels (BL0 through BL7 Touch, Idle and Proximity)

Address

Name

Acc

Bits

Field

Function

0x3F SPOLevelBL0 R/W

7:6 Reserved Reserved, set to 00

R/W

5:0

SPO Level BL0

Specify analog output level for BL0

V = (n / 63) * SVDD

0x40

SPOLevelBL1

R/W

7:6

Reserved

Reserved, set to 00

R/W

5:0 SPO Level BL1 Same as SPOLevelBL0 but for BL1

0x41

SPOLevelBL2

R/W

7:6

Reserved

Reserved, set to 00

R/W

5:0 SPO Level BL2 Same as SPOLevelBL0 but for BL2

0x42

SPOLevelBL3

R/W

7:6

Reserved

Reserved, set to 00

R/W

5:0 SPO Level BL3 Same as SPOLevelBL0 but for BL3

0x43

SPOLevelBL4

R/W

7:6

Reserved

Reserved, set to 00

R/W

5:0 SPO Level BL4 Same as SPOLevelBL0 but for BL4

0x44

SP

OLevelBL5

R/W

7:6

Reserved

Reserved, set to 00

R/W

5:0 SPO Level BL5 Same as SPOLevelBL0 but for BL5

0x45

SPOLevelBL6

R/W

7:6

Reserved

Reserved, set to 00

R/W

5:0 SPO Level BL6 Same as SPOLevelBL0 but for BL6

0x46

SPOLevelBL7

R/W

7:6

Reserved

Reser

ved, set to 00

R/W

5:0 SPO Level BL7 Same as SPOLevelBL0 but for BL7

0x47

SPOLevelIdle

R/W

7:6

Reserved

Reserved, set to 00

R/W

5:0 SPO Level Idle Specify analog output level for idle

V = (n / 63) * SVDD

0x48 SPOLevelProx

R/W

7 SPO Report Prox Enable reporting of proximity on SPO

0 : Do not report proximity on SPO

1 : Report proximity on SPO

R/W

6 SPO Prox Channel

Mapping 0 : Report proximity on SPO1

1 : Report proximity on SPO2

R/W

5:0 SPO Level Prox Specify analog output level for proximity

V = (n / 63) * SVDD

4.6 Buzzer Control

4.6.1 Buzzer Trigger Event Selection

Address

Name

Acc

Bits

Field

Function

0x4B

BuzzerTrigger

R/W

7:5

Reserved

Reserved, set to 000

R/W

4

Buzzer Near

0 : Do not activate buzzer on proximity

detection

1 : Activate buzzer on proximity detection

R/W

3 Buzzer Far 0 : Do not activate buzzer on proximity loss

1 : Activate buzzer on proximity loss

R/W

2

Buzzer Touch

0 : Do not activate buzzer on touch detection

1 : Activate buzzer on touch detection

R/W

1 Buzzer

Release 0 : Do not activate buzzer on touch release

1 : Activate buzzer on touch release

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R/W

0 Buzzer Idle

Level Set SPO2 pin drive level in buzzer mode when

buzzer is not active.

0 : GND

1 : VDD

4.6.2 Buzzer Duration and Frequency

Address

Name

Acc

Bits

Fi

eld

Function

0x4C

BuzzerFreq

R/W

7:6

Buzzer Phase 1 Duration

00 : 5ms

01 : 10ms

10 : 15ms

11 : 30ms

R/W

5:4 Buzzer Phase 1

Frequency 00 : 1KHz

01 : 2KHz

10 : 4KHz

11 : 8KHz

R/W

3:2 Buzzer Phase 2 Duration 00 : 5ms

01 : 10ms

10 : 15ms

11 : 30ms

R/

W

1:0

Buzzer Phase 2

Frequency

00 : 1KHz

01 : 2KHz

10 : 4KHz

11 : 8KHz

4.7 Real Time Sensor Data Readback

4.7.1 CapSense Channel Select for Readback

Address

Name

Acc

Bits

Field

Function

0x63 CapSenseChanSelect

R 7:4 Reserved Reserved, will read 0000

R 3:0 CapSense Chan Select Set which BL channel data will be

present in registers 0x64 through

0x6B

0000 : BL0

…

0111 : BL7

1000 : Combined channel proximity

4.7.2 CapSense Useful Data MSB and LSB

Address

Name

Acc

Bits

Field

Function

0x64

CapSenseUsefulDataMsb

R

7:0

CapSense Useful Data

Msb

Selected channel useful data.

Signed, 2's complement format

0x65 CapSenseUsefulDataLsb R 7:0 CapSense Useful Data

Lsb

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4.7.3 CapSense Average Data MSB and LSB

Address

Name

Acc

Bits

Field

Function

0x66 CapSenseAverageDataMsb

R 7:0 CapSense Average

Data Msb Selected channel average

data.

Signed, 2's complement format

0x67 CapSenseAverageDataLsb R 7:0 CapSense Average

Data Lsb

4.7.4 CapSense Diff Data MSB and LSB

Address

Name

Acc

Bits

Field

Function

0x68

CapSenseDiffDataMsb

R

7:0

CapSen

se Diff Data

Msb

Selected channel diff data.

Signed, 2's complement format

0x69 CapSenseDiffDataLsb R 7:0 CapSense Diff Data

Lsb

4.7.5 CapSense Compensation DAC Value MSB and LSB

Address

Name

Acc

Bits

Field

Function

0x6A CapSenseCompMsb R/W

7:0 CapSense Comp Msb Offset compensation DAC code.

Read : Read the current value from

the last compensation for the

selected channel

Write : Manually set the

compensation DAC for the selected

channel.

When written, the internal DAC

code is updated after the write of

the LSB reg. MSB and LSB regs

should be written in sequence.

0x6B CapSenseCompLsb R/W

7:0 CapSense Comp Lsb

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5 I2C

I

NTERFACE

The I2C implemented on the SX9512/12B/13/13B is compliant with:

- standard (100kb/s), fast mode (400kb/s)

- slave mode

- 7 bit address : SX9512/13->0x2B ; SX9512B/13B ->0x2D.

The host can use the I2C to read and write data at any time.

Three types of registers are considered:

- status (read). These registers give information about the status of the capacitive buttons, GPIs, operation modes

etc…

- control (read/write). These registers control the soft reset, operating modes, GPIOs and offset compensation.

- REGISTERS gateway (read/write). These registers are used for the communication between host and the

REGISTERS. The REGISTERS gateway communication is done typically at power up and is not supposed to be

changed when the application is running. The REGISTERS needs to be re-stored each time the

SX9512/12B/13/13B is powered down.

The REGISTERS can be stored permanently in the NVM memory of the SX9512/12B/13/13B. The REGISTERS

gateway communication over the I2C at power up is then not required.

The I2C will be able to read and write from a start address and then perform read or writes sequentially, and the

address increments automatically.

The supported I2C access formats are described in the next sections.

5.1 I2C Write

The format of the I2C write is given in Figure 36.

After the start condition [S], the slave address (SA) is sent, followed by an eighth bit (‘0’) indicating a Write. The

SX9512/12B/13/13B then acknowledges [A] that it is being addressed, and the master sends an 8 bit Data Byte

consisting of the SX9512/12B/13/13B Register Address (RA). The slave acknowledges [A] and the master sends

the appropriate 8 bit Data Byte (WD0). Again the slave acknowledges [A]. In case the master needs to write more

data, a succeeding 8 bit Data Byte will follow (WD1), acknowledged by the slave [A]. This sequence will be

repeated until the master terminates the transfer with the Stop condition [P].

Figure 36 I2C write

The register address is incremented automatically when successive register data (WD1...WDn) is supplied by the

master.

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5.2 I2C read

The format of the I2C read is given in Figure 37.

After the start condition [S], the slave address (SA) is sent, followed by an eighth bit (‘0’) indicating a Write. The

SX9512/12B/13/13B then acknowledges [A] that it is being addressed, and the master responds with an 8 bit data

consisting of the Register Address (RA). The slave acknowledges [A] and the master sends the Repeated Start

Condition [Sr]. Once again, the slave address (SA) is sent, followed by an eighth bit (‘1’) indicating a Read.

The SX9512/12B/13/13B responds with acknowledge [A] and the Read Data byte (RD0). If the master needs to

read more data it will acknowledge [A] and the SX9512/12B/13/13B will send the next read byte (RD1). This

sequence can be repeated until the master terminates with a NACK [N] followed by a stop [P].

Figure 37 I2C read

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6 P

ACKAGING

I

NFORMATION

6.1 Package Outline Drawing

SX9512/12B and SX9513/13B are assembled in a QFN-20 package as shown in Figure 38 and TSSOP-24 as

show in Figure 39.

Figure 38 QFN Package outline drawing

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Figure 39 TSSOP Package outline drawing

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6.2 Land Pattern

The land pattern of QFN-20 package is shown in Figure 40.

The land pattern of TSSOP-24 package is shown in Figure 41.

Figure 40 QFN-20 Land Pattern

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Figure 41 TSSOP-24 Land Pattern

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CONTACT INFORMATION

3

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believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the

publisher for any consequence of its use. Publication thereof does not convey nor imply any license under

patent or other industrial or intellectual property rights. Semtech assumes no responsibility or liability

whatsoever for any failure or unexpected operation resulting from misuse, neglect improper installation, repair

or improper handling or unusual physical or electrical stress including, but not limited to, exposure to

parameters beyond the specified maximum ratings or operation outside the specified range.

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Notice: All referenced brands, product names, service names and trademarks are the property of their

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Wireless and Sensing Products Division

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Phone: (805) 498-2111 Fax: (805) 498-3804

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