BU21079FE2 - ROHM SEMICONDUCTOR

○Product structure：Silicon monolithic integrated circuit ○This product has no designed protection against radioactive rays

1/34 TSZ02201-0Y1Y0FZ00150-1-2

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Capacitive Controller ICs

Capacitive Switch Controller ICs

BU21079F

Key Specifications

■ Input voltage range

■ Operating temperature range

■ Operating current

■ Detect cycl e

3.0V to 5.5V

-25℃ to 85℃

2.5mA (Typ)

6msec (Typ)

General Description

BU21079F is a capacitive switch controller used for

operating sw itche s.

Low power consumption is achieved using the

intermittent operation mode.

In addition to a regular simple switch, it supports matrix

switches which are arranged in the matrix sensors. If

external noise and temperature drift are detected, the

automatic self-calibration is activated.

Features

■ 8 capacitiv e sen sor ports

■ Supports matrix switches. Maximum of 16

switches.

■ Automatic self-calibration

■ Continued touch detection

■ Sends an interrupt when there is a detected result

of switch operation

■ 2-wire serial bus interface

■ 3.3V or 5.0V single power supply

■ Built-in Power-On-Reset and Oscillator

Applications

■ Electronic devices with multiple switches.

■ Information appliances such as printers.

■ AV appliances such as digital TV and HDD

recorder.

■ Notebook PC.

■ Air-conditioner. Refrigerator. Electrical rice cooker.

Packages

BU21079F :

SOP16

10.00 ㎜×6.20 ㎜×1.71 ㎜

T y pical A pplication Circuit

4.7kΩ

Figure 1. Typical Application Circuit

2/34

Datasheet

BU21079F

TSZ02201-0Y1Y0FZ00150-1-2

www.rohm.com

TSZ22111・15・001

OVERVIEW

BU21079F is a capacitive sensor controller for switch operation.

BU21079F has the following blocks: AFE (Analog Front End) detecting capacitance, A/D converter, MPU, 2-wire serial bus

interface compatible with I2C protoc ol, power-on-reset, and oscillator. It is operated with a 3.0V to 5.5V single power supply.

The results detected during switch operations (Touch/Release/Hold) are stored in a register. An interrupt is sent from INT

port to the host when a register is updated during operations. If external noise and temperature drift are detected, automatic

self-calibration is activated. When continuous monitoring of the host is unnecessary, the load of the host will be reduced.

Intermittent operation

When touch ON is detected, its operation shifts from intermittent operation to normal operation. When touch OFF is

detected, its operation shifts from normal operation to intermittent operation, and the operating power is decreased.

Sensing during intermittent operation is called “check sensing” and sensing during normal operation is called “normal

sensing”.

Simple switch

One sensor is assigned to one switch. Each simple switch has the registers for the detected Touch/Release/Hold

operations. Simple switches support multi-detect Touch/Release/Hold. It is possible to mask unused switches.

Matrix switches

The cross points of the sensors which are arranged in a matrix can be assigned to individual switches. Each matrix

switch has registers for detected Touch/Release/Hold operations. Matrix switches do not support multi-detect

Touch/Release/Hold. It is possible to mask unused matrix switches. BU21079F supports 16 matrix switches configured by

4x4 sensors.

Automatic self-calibration

BU21079F checks the status of the sensors based on the detected result. If external noise and temperature drift are

detected, the automatic self-calibration is activated in order to get stable detection.

Host interface

BU21079F is slave device for the host device. 2-wire serial bus is compatible with I2C protocol.

Slave Address Is 0x5C.

Pin Configurations

Figure 2. Pin configuration of BU21079F

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Datasheet

BU21079F

TSZ02201-0Y1Y0FZ00150-1-2

www.rohm.com

TSZ22111・15・001

Pin Descriptions

Number

Name Type Function Note Power Initial

condition

I/O

Equivalence

circuit

1 SIN3 Ain

Capacitive Touch Sensor 3 AVDD Hi-Z

Fig.3

2 SIN2 Ain

Capacitive Touch Sensor 2 AVDD Hi-Z

Fig.3

3 SIN1 Ain

Capacitive Touch Sensor 1 AVDD Hi-Z

Fig.3

4 SIN0 Ain

Capacitive Touch Sensor 0 AVDD Hi-Z

Fig.3

5 AVDD Power

LDO output for analog blocks －－－

6 DVDD Power

LDO output for digital blocks －－－

7 VDD Power

Power －－－

8 VSS GND

Ground －－－

9 SCL In Host I/F:SCL input pin VDD Hi-Z

Fig.4

10 SDA InOut

Host I/F:SDA input/output pin VDD Hi-Z Fig.4

11 INT Out

Interrupt output Interrupt “H” VDD L Fig.4

12 TEST In Test input Fix “L” at the normal

operation VDD － Fig.5

13 SIN7 Ain

Capacitive Touch Sensor 7 AVDD Hi-Z Fig.3

14 SIN6 Ain

Capacitive Touch Sensor 6 AVDD Hi-Z

Fig.3

15 SIN5 Ain

Capacitive Touch Sensor 5 AVDD Hi-Z

Fig.3

16 SIN4 Ain

Capacitive Touch Sensor 4 AVDD Hi-Z

Fig.3

I/O Equivalent Circuits

PAD

CIN

VDD

OEN

Figure 3. I/O equivalent circuit (a) Figure 4. I/O equivalent circuit (b) Figure 5. I/O equivalent circuit (c)

4/34

Datasheet

BU21079F

TSZ02201-0Y1Y0FZ00150-1-2

www.rohm.com

TSZ22111・15・001

Block Diagram

Description of Blocks

Sensor AFE、C/V Converter

Converts capacitance from the sensors to voltage.

A/D Converts the voltage from C/V Converter to digital.

LDO27

2.7V output LDO for Sensor AFE, C/V Converter and A/D.

LDO15

1.5V output LDO for OSC and digital blocks.

OSC

Ring oscillator used for the system clock.

POR

Power-On-Reset monitoring LDO15 for system reset.

MPU

Controls switch operations based on the sensing results and run Auto-calibration.

INT port informs the host that switch operations are detected.

PROM

Programmable ROM for the built-in MPU.

WRAM

Work RAM for the built-in MPU.

HOST I/F

2-wire serial bus interface compatible with I2C protocol.

AFE_CNT

Sequencer of Sensor AFE, C/V converter and A/D.

WDTR

Watchdog Timer Reset. It operates as the system resets. If MPU hangs-up, Watchdog Timer Reset can reset the IC.

Figure 6. Block Diagram

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Datasheet

BU21079F

TSZ02201-0Y1Y0FZ00150-1-2

www.rohm.com

TSZ22111・15・001

Absolute Maximum Ratings (Ta = 25℃)

Parameter Symbol Rating Unit

Power supply vo ltage VDD -0.5 to 7.0 V

Input voltage VIN -0.5 to VDD + 0.3 V

Storage temperature range Tstg -55 to 125 ℃

Permissible loss Pd 0.30

*1 W

Maximum junction temperature Tjmax 125 ℃

*1 Derate by 3.00mW/℃ when operating above Ta =25℃. (IC only).

When mounted in a Rohm standard board (70mm x 70mm x 1.6t mm), Pd is 0.50W, and it reduces in 5.00mW/℃ over Ta=25℃.

Recommended Operating Conditions

Parameter Symbol Rating Unit

Power supply voltage VDD 3.0 to 5.5 V

Operating temperature range Topr -20 to 85 ℃

Electrical Characteristics (Ta = 25℃ , VDD = 3.3V , VSS = 0V)

Rating

Parameter Symbol

Min. Typ. Max.

Unit Condition

Input High voltage VIH VDD x 0.7 - VDD + 0 .3 V

Input Low volt age VIL VSS - 0.3 - VDD x 0.3 V

Output High voltage VOH VDD - 0.5 - VDD V IOH = -4mA

Output Low voltage VOL VSS - VSS + 0.5 V I OL = 4mA

Oscillator clock frequency1 fOSC1 45 50 55 MHz

Oscillator clock frequency2 fOSC2 51.2 64 76.8 KHz

DVDD LDO output voltage VDVDD 1.35 1.50 1.65 V

AVDD LDO output voltage VAVDD 2.61 2.71 2.81 V

Full scan operating current IDD - 2.5 - mA No load of sensors.

Intermittent operating current IINT 75 uA

Intermittent operation cycle

200ｍｓ

6/34

Datasheet

BU21079F

TSZ02201-0Y1Y0FZ00150-1-2

www.rohm.com

TSZ22111・15・001

No accessing to the reserved areas is allowed

GroupAddressNameR/WIni76543210

0x00 SIN_DATA0 R 0x00

0x01 SIN_DATA1 R 0x00

0x02 SIN_DATA2 R 0x00

0x03 SIN_DATA3 R 0x00

0x04 SIN_DATA4 R 0x00

0x05 SIN_DATA5 R 0x00

0x06 SIN_DATA6 R 0x00

0x07 SIN_DATA7 R 0x00

0x08 SIN_DATA8 R 0x00

0x09-0F reserved R 0x00

0x10 INTERRUPT R 0x00 CONTDET OFFDET ONDET PERCAL WDT ERCAL CAL INI

0x11 SIN_STATE R 0x00 SIN7_STAT SIN6_STAT SIN5_STAT SIN4_STAT SIN3_STAT SIN2_STAT SIN1_STAT SIN0_STAT

0x12 Reserved R 0x00

0x13 DETECT_SW_ON R 0x00 SW7_ON SW6_ON SW5_ON SW4_ON SW3_ON SW2_ON SW1_ON SW0_ON

0x14 DETECT_SLIDER_ON R 0x00 SLIDER_ON

0x15 DETECT_MAT_ON R 0x00 MAT_ON

0x16 DETECT_SW_OFF R 0x00 SW7_OFF SW6_OFF SW5_OFF SW4_OFF SW3_OFF SW2_OFF SW1_OFF SW0_OFF

0x17 DETECT_SLIDER_OFF R 0x00 SLIDER_OFF

0x18 DETECT_MAT_OFF R 0x00 MAT_OFF

0x19 DETECT_SW_CONT R 0x00 SW7_CONT SW6_CONT SW5_CONT SW4_CONT SW3_CONT SW2_CONT SW1_CONT SW0_CONT

0x1A Reserved R 0x00

0x1B DETECT_MAT_CONT R 0x00 MAT_CONT

0x1CSTATER0x00E_CALIB-----INTVLCALIB

0x1D Reserved R 0x00

0x1E RACT R 0x00

0x1F-84 Reserved R 0x00

0x85 SOFTRESET0 R/W 0x00

0x86-89 Reserved - -

0x8A SOFTRESET1 R/W 0x00

- 0x8B-BF Reserved - -

0xC0 CFG_SIN_1_0 R/W 0x00

0xC1 CFG_SIN_3_2 R/W 0x00

0xC2 CFG_SIN_5_4 R/W 0x00

0xC3 CFG_SIN_7_6 R/W 0x00

0xC4 CFG_SIN_x_8 R/W 0x00

0xC5-C7 Reserved R/W 0x00

0xC8 GAIN_1_0 R/W 0x00

0xC9 GAIN_x_2 R/W 0x00

0xCA ON_TH0 R/W 0x00

0xCB ON_TH1 R/W 0x00

0xCC ON_TH2 R/W 0x00

0xCD OFF_TH R/W 0x00 -

0xCE OVERSAMPLES R/W 0x00

0xCF CONTTIMES R/W 0x00 CONTSEL -

SLIDER_CNT

SD_SIN1

SD_SIN2

SD_SIN3

SD_SIN4

SD_SIN5

SD_SIN6

SD_SIN7

SD_SIN8

Detect

result

RACT

Detect

value

SD_SIN0

Reset

setting

SRST[7:0]

reserved

SRST[15:8]

reserved

Sensor

setting

GA_SIN1 ON_SIN1 GA_SIN0 ON_SIN0

GA_SIN3 ON_SIN3 GA_SIN2 ON_SIN2

GA_SIN5 ON_SIN5 GA_SIN4 ON_SIN4

GA_SIN7 ON_SIN7 GA_SIN6 ON_SIN6

- - GA_SIN8 ON_SIN8

GA1 GA0

GA2

ON0

ON1

ON2

OFF

OST -

CONT

KEY_ON-

KEY_OFF-

KEY_CONT-

7/34

Datasheet

BU21079F

TSZ02201-0Y1Y0FZ00150-1-2

www.rohm.com

TSZ22111・15・001

Access to reserved areas is restricted.

GroupAddressNameR/WIni76543210

0xD0 MSK_DETECT_SW R/W 0x00 MSK_SW7 MSK_SW6 MSK_SW5 MSK_SW4 MSK_SW3 MSK_SW2 MSK_SW1 MSK_SW0

0xD1 Reserved R/W 0x00

0xD2 MSK_DETECT_MAT0 R/W 0x00 MSK_KEYH MSK_KEYG MSK_KEYF MSK_KEYE MSK_KEYD MSK_KEYC MSK_KEYB MSK_KEYA

0xD3 MSK_DETECT_MAT1 R/W 0x00 MSK_KEYP MSK_KEYO MSK_KEYN MSK_KEYM MSK_KEYL MSK_KEYK MSK_KEYJ MSK_KEYI

0xD4-D8 Reserved R/W 0x00

0xD9 EN_SLIDER R/W 0x00 EN_SLID_SIN7 EN_SLID_SIN6 EN_SLID_SIN5 EN_SLID_SIN4 EN_SLID_SIN3 EN_SLID_SIN2 EN_SLID_SIN1 EN_SLID_SIN

0xDA KEEP_SENS_NUM R/W 0x00

0xDB UNIT_SENS_NUM R/W 0x00

0xDC TH_SLEEP_H R/W 0x00

0xDD TH_SLEEP_L R/W 0x00

0xDE OUTPUT_OFFSET R/W 0x00

0xDF MSK_INTERRUPT R/W 0x00 - - - MSK_PERCAL MSK_WDT MSK_ERCAL MSK_CAL -

0xE0 MODE_CONFIG0 R/W 0x00 --

FIX_BASE_CY

FIX_SNS_CYC - SLID_LOOP EN_DSLP EN_SLP

0xE1 MODE_CONFIG1 R/W 0x00 DIS_SIN8 - PERCAL_DIS RET_DIS HOP_DIS ERROR_DIS DRIFT_DIS

0xE2 EN_SIN R/W 0x00 EN_SIN7 EN_SIN6 EN_SIN5 EN_SIN4 EN_SIN3 EN_SIN2 EN_SIN1 EN_SIN0

0xE3 SENS_NUM R/W 0x00

0xE4 SENS_RD_TIME R/W 0x00

0xE5 SENS_RST_TIME R/W 0x00

0xE6 SENS_IRST_TIME R/W 0x00

0xE7 CHK_NUM R/W 0x00

0xE8 CHK_RD_TIME R/W 0x00

0xE9 CHK_RST_TIME R/W 0x00

0xEA CHK_IRST_TIME R/W 0x00

0xEB DIG_GAIN R/W 0x00

0xEC CHK_WAIT_TIME R/W 0x00

0xED SENS_WAIT_TIME R/W 0x00

0xEE CALIB_CONFIG0 R/W 0x00

0xEF CALIB_CONFIG1 R/W 0x00

0xF0 CLR_INT R/W 0x00 - - - C_PERCAL C_WDT C_ERCAL C_CAL C_INI

0xF1 CLR_DETECT_SW_ON R/W 0x00 C_SW7_ON C_SW6_ON C_SW5_ON C_SW4_ON C_SW3_ON C_SW2_ON C_SW1_ON C_SW0_ON

0xF2 Reserved R/W 0x00

0xF3CLR_DETECT_MAT_ONR/W0x00C_MAT_ON-------

0xF4 CLR_DETECT_SW_OFF R/W 0x00 C_SW7_OFF C_SW6_OFF C_SW5_OFF C_SW4_OFF C_SW3_OFF C_SW2_OFF C_SW1_OFF C_SW0_OFF

0xF5

LR_DETECT_SLIDER_OF R/W 0x00 C_SLIDER_OF

-------

0xF6CLR_DETECT_MAT_OFFR/W0x00C_MAT_OFF-------

0xF7 CLR_DETECT_SW_CONT R/W 0x00 C_SW7_CONT C_SW6_CONT C_SW5_CONT C_SW4_CONT C_SW3_CONT C_SW2_CONT C_SW1_CONT C_SW0_CONT

0xF8 Reserved R/W 0x00

0xF9CLR_DETECT_MAT_CONTR/W0x00C_MAT_CONT-------

0xFA-FD Reserved R/W 0x00

0xFE WACT R/W 0x00

0xFF CONTROL R/W 0x00 FRCRLS CALOVF - CALMOD - CFG CAL ACT

DRIFT_SIN_NUM

RET_NUM

Control

WACT

Analog

setting

CHK_WAIT_TIME

SENS_NUM

Mask

setting KEEP_SENS_NUM

TH_SLEEP[15:8]

TH_SLEEP[7:0]

OUTPUT_OFFSET

UNIT_SENS_NUM

SENS_DIG_GAIN

SENS_RST_TIME

SENS_IRST_TIME

CHK_RST_TIME

CHK_IRST_TIME

SENS_WAIT_TIME

CHK_DIG_GAIN

PRECAL_PERIOD

CHK_RD_TIME

CHK_NUM

SENS_RD_TIME

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Datasheet

BU21079F

TSZ02201-0Y1Y0FZ00150-1-2

www.rohm.com

TSZ22111・15・001

【0x00-0x08 : Sensor Data】

Name: SIN_DATA

Address: 0x00-0x08

Description: This register shows the 8bit ADC values for each sensor.

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0x00 SD_SIN0[7] SD_SIN0[6] SD_SIN0[5] SD_SIN0[4] SD_SIN0[3] SD_SIN0[2] SD_SIN0[1] SD_SIN0[0]

0x01 SD_SIN1[7] SD_SIN1[6] SD_SIN1[5] SD_SIN1[4] SD_SIN1[3] SD_SIN1[2] SD_SIN1[1] SD_SIN1[0]

0x02 SD_SIN2[7] SD_SIN2[6] SD_SIN2[5] SD_SIN2[4] SD_SIN2[3] SD_SIN2[2] SD_SIN2[1] SD_SIN2[0]

0x03 SD_SIN3[7] SD_SIN3[6] SD_SIN3[5] SD_SIN3[4] SD_SIN3[3] SD_SIN3[2] SD_SIN3[1] SD_SIN3[0]

0x04 SD_SIN4[7] SD_SIN4[6] SD_SIN4[5] SD_SIN4[4] SD_SIN4[3] SD_SIN4[2] SD_SIN4[1] SD_SIN4[0]

0x05 SD_SIN5[7] SD_SIN5[6] SD_SIN5[5] SD_SIN5[4] SD_SIN5[3] SD_SIN5[2] SD_SIN5[1] SD_SIN5[0]

0x06 SD_SIN6[7] SD_SIN6[6] SD_SIN6[5] SD_SIN6[4] SD_SIN6[3] SD_SIN6[2] SD_SIN6[1] SD_SIN6[0]

0x07 SD_SIN7[7] SD_SIN7[6] SD_SIN7[5] SD_SIN7[4] SD_SIN7[3] SD_SIN7[2] SD_SIN7[1] SD_SIN7[0]

0x08 SD_SIN8[7] SD_SIN8[6] SD_SIN8[5] SD_SIN8[4] SD_SIN8[3] SD_SIN8[2] SD_SIN8[1] SD_SIN8[0]

R/W R R R R R R R R

Initial val. 0 0 0 0 0 0 0 0

【0x10 : Interrupt factor】

Name: INTERRUPT

Address: 0x10

Description: This register shows the interrupt factors. Port INT outputs this register’s OR operation.

INI : Initialization finish.

It is set at the time the initialization of the MPU is completed.

There is no corresponding mask register. The clear register is 0xF0 [0].

It is also set when initialization by WDT occurs.

CAL : Software-calibration finish.

It is set at the time the calibration is finished.

The corresponding mask register is 0xDF [1], and the clear register is 0xF0 [1].

ERCAL : Self-calibration finish.

It is set at the time the calibration is ended by an error. There are four errors in calibration (Drift

calibration, Calib-error calibration, Hopping calibration, and Return calibration).The corresponding

mask register is 0xDF [2] and the clear register is 0xF0[ 2].

WDT : Watch Dog Timer interrupt generation

It is WDT interruption generation time.

If WDT interrupt occurs again without clearing WDT, HW reset will start, all are initialized, and

INIT interruption of 0x10 [0] is active (low).

The corresponding mask register is 0xDF [3], and the clear register is 0xF0 [3].

The clearance of the WDT counter by MPU is not performed other than the time of a sense.

Therefore, in the state of deep sleep (0xE0 [1] =0), a WDT interrupt occurs periodically.

* The initial state is deep sleep.

PERCAL : Periodic calibration finish.

It is set at the time the periodic cali brat ion is completed.

The corresponding mask register is 0xDF [4], and the clear register is 0xF0 [4].

ONDET : Detection of switch-on.

The value of this register is '1 'when it detects ”ON” switch operation. This register is

cleared by clearing every bit of the “Detection Switch-On” register. (0x13, 0x15)

OFFDET : Detection of switch-o ff.

The value of this register is '1 'when it detects ”OFF” switch operation. This register is

cleared by clearing every bit of the “Detection Switch-Off” register.( 0x16, 0x18)

CONTDET : Detection of continued touch.

The value of this register is '1 'when it detects a continued touch switch operation. This register is

cleared by clearing every bit of the “Detection continued touch” register.( 0x19, 0x1B)

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0x10 CONTDET OFFDET ONDET PERCAL WDT ERCAL CAL INI

R/W R R R R R R R R

Initial val. 0 0 0 0 0 0 0 0

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Datasheet

BU21079F

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www.rohm.com

TSZ22111・15・001

【0x11 : Sensor State】

Name: SIN_STATE

Address: 0x11

Description: This register indicates the state of each sensor.

1 : Switch-on.(Register “SIN” > Register “ON”) 0 : switch-off. (Register “SIN” < Regi ster “OFF”)

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0x11 SIN7_STAT SIN6_STAT SIN5_STAT SIN4_STAT SIN3_STAT SIN2_STAT SIN1_STAT SIN0_STAT

R/W R R R R R R R R

Initial val. 0 0 0 0 0 0 0 0

【0x13, 0x15 : Detection Switch-On】

Name: DETECT_ON

Address: 0x13, 0x15

Description: This register indicates the transition from Off state to On state of every switch.

Since SW 0-7 supports multiple presses, each switch has bit recognition. And the matrix key does

not support multiple detection, so matrix switch is indicated by 1 bit for ON detection (MAT) and 4

bits (KEY switch). Logical OR of each SW and MAT will be ONDET interrupt source register.

1: Detect On. 0: No detect.

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0x13 SW7_ON SW6_ON SW5_ON SW4_ON SW3_ON SW2_ON SW1_ON SW0_ON

0x15 MAT_ON - - - KEY_ON[3] KEY_ON[2] KEY_ON[1] KEY_ON[0]

R/W R R R R R R R R

Initial val. 0 0 0 0 0 0 0 0

【0x14 : Detection slider On】

Name: DETECT_SLIDER_ON

Address: 0x14

Description: SLIDER_ON: The value of this register is “1” when SLIDER is detected.

1: Detect On. 0: No detect.

SLIDER_CNT[6:0] : The detected amount of movement is shown in 2’s complement. The amount of

movement detected in order of SIN0→SIN1→SIN2→…→SIN7 is expressed by a positive value, and

the amount of the movement detected in a reverse order is expressed by a negative value. The

amount of the movement is 2 when center of gravity moves to the next sensor, and when center of

gravity comes between 2 sensors, the amount of the movement is 1. It loops when the range where the

detected amount of movement that can be shown is exceeded. The next of 63(0111111) become

-64(1000000).

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0x14 SLIDER_ON SLIDER_

CNT[6] SLIDER_

CNT[5] SLIDER_

CNT[4] SLIDER_

CNT[3] SLIDER_

CNT[2] SLIDER_

CNT[1] SLIDER_

CNT[0]

R/W R R R R R R R R

Initial val. 0 0 0 0 0 0 0 0

【0x16, 0x18 : Detection Switch-Off】

Name: DETECT_OFF

Address: 0x16, 0x18

Description: This register indi cates the transition from On state to Off state of every switch.

Since SW 0-7 supports multiple presses, each switch has bit recognition. And the matrix k ey does not

support multiple detection, so matrix switch is indicated by 1 bit for ON detection (MAT) and 4 bits (KEY

switch). Logical OR of each SW and MAT will be OFFDET interrupt source register.

1 : Detect Off. 0 : No detect.

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0x16 SW7_OFF SW6_OFF SW5_OFF SW4_OFF SW3_OFF SW2_OFF SW1_OFF SW0_OFF

0x18 MAT_OFF - - - KEY _OFF[3] KEY_OFF[2] KEY _OFF[1] KEY _OFF[0]

R/W R R R R R R R R

Initial val. 0 0 0 0 0 0 0 0

10/34

Datasheet

BU21079F

TSZ02201-0Y1Y0FZ00150-1-2

www.rohm.com

TSZ22111・15・001

【0x17 : Detection slider Off】

Name: DETECT_SLIDER_OFF

Address: 0x17

Description: It is set when IC detects that the slider is in the off state. It is necessary to clear this flag to detect. The

corresponding clear register is 0xF5 [7]. 1 : Detect Off. 0 : No detect.

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0x17 SLIDER_OFF - - - - - - -

R/W R R R R R R R R

Initial val. 0 0 0 0 0 0 0 0

【0x19, 0x1B : Detection continued touch】

Name: DETECT_CONT

Address: 0x19, 0x1B

Description: This register indi cates the detec tion of continued touch for every switch.

Since SW 0-7 supports multiple presses, each switch has bit recognition. And the matrix k ey does not

support multiple detection, so matrix switch is indicated by 1 bit for ON detection (MAT) and 4 bits(KEY

switch). Logical OR of each SW and MAT will be CONTDET interrupt source register.

1 : Detect continued touch. 0 : No detect.

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0x19 SW7_CONT SW6_CONT SW5_CONT SW4_CONT SW3_CONT SW2_CONT SW1_CONT SW0_CONT

0x1B MAT_CONT - - - KEY_CONT[3] KEY_CONT[2] KEY_CONT[1] KEY_CONT[0]

R/W R R R R R R R R

Initial val. 0 0 0 0 0 0 0 0

【0x1C : State of IC】

Name: STATE

Address: 0x1C

Description: This register indicates the state of IC.

CALIB : Indicates whether the IC is in calibrat ion or not.

1: In calibration 0: Not in calibration

INTVL : Indicates whether the IC is in Intermittent Operation or not.

1: Intermittent Operation 0: Not in Intermittent Operation

E_CALIB : When the calibration fails for three consecutive times, it is set.

1: Calibration Error 0: No Error

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0x1C E_CALIB - - - - - INTVL CALIB

R/W R - - - - - R R

Initial val. 0 - - - - - 0 0

【0x1E : Read register for operation check of MPU】

Name: RACT

Address: 0x1E

Description: This register is a read register for operational check of the IC. The value written to the write register for

operation check (Address is 0xFE) is copied to this register. If the write value and the read value is equal,

MPU and I/F are operating normally.

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0x1E RACT[7] RACT[6] RACT[5] RACT[4] RACT[3] RACT[2] RACT[1] RACT[0]

R/W R R R R R R R R

Initial val. 0 0 0 0 0 0 0 0

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TSZ22111・15・001

【0x85, 0x8A : Software Reset】

Name: SRST

Address: 0x85, 0x8A

Description: These registers are used for hardware reset. If register 0x85=55h and register 0x8A=AAh, then a hardware

reset will be done.

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0x85 SRST[7] SRST[6] SRST[5] SRST[4] SRST[3] SRST[2] SRST[1] SRST[0]

0x8A SRST[15] SRST[14] SRST[13] SRST[12] SRST[11] SRST[10] SRST[9] SRST[8]

R/W R/W R/W R/W R/W R/W R/W R/W R/W

Initial val. 0 0 0 0 0 0 0 0

【0xC0 – 0xC4 : Select a setting for Gain and Threshold for “Off→On”】

Name: CFG_SIN

Address: 0xC0 – 0xC4

Description: You can set 3 values for gain and set 3 values for threshold to the “Off → On” registers of this IC.

These registers are used to select a setting for gain and threshold for every sensor. There are three

available sett ing s.

Gain：GA_SIN*[1:0] = 0x0 : Select GA0.

0x1 : Select GA1.

0x2 : Select GA2.

0x3 : Select GA0.

Threshold：ON_SIN*[1:0] = 0x0 : Select ON0.

0x1 : Select ON1.

0x2 : Select ON2.

0x3 : Select ON0.

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0xC0 GA_SIN1[1] GA_SIN1[0] ON_SIN1[1] ON_SIN1[0] GA_SIN0[1] GA_SIN0[0] ON_SIN0[1] ON_SIN0[0]

0xC1 GA_SIN3[1] GA_SIN3[0] ON_SIN3[1] ON_SIN3[0] GA_SIN2[1] GA_SIN2[0] ON_SIN2[1] ON_SIN2[0]

0xC2 GA_SIN5[1] GA_SIN5[0] ON_SIN5[1] ON_SIN5[0] GA_SIN4[1] GA_SIN4[0] ON_SIN4[1] ON_SIN4[0]

0xC3 GA_SIN7[1] GA_SIN7[0] ON_SIN7[1] ON_SIN7[0] GA_SIN6[1] GA_SIN6[0] ON_SIN6[1] ON_SIN6[0]

0xC4 - - - - GA_SIN8[1] GA_SIN8[0] ON_SIN8[1] ON_SIN8[0]

R/W R/W R/W R/W R/W R/W R/W R/W R/W

Initial val. 0 0 0 0 0 0 0 0

【0xC8 – 0xC9 : Value of GAIN】

Name: GA0、GA1、GA2

Address: 0xC8 – 0xC9

Description: This register is used for setting the gain of AFE. The smaller the value of GA, the higher the gain will be.

You can set 3 values for gain. These values are assigned to each sensor by register GA_SIN including

CFG_SIN.

The settable range： 0x1 ≦ GA ≦ 0xF

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0xC8 GA1[3] GA1[2] GA1[1] GA1[0] GA0[3] GA0[2] GA0[1] GA0[0]

0xC9 - - - - GA2[3] GA2[2] GA2[1] GA2[0]

R/W R/W R/W R/W R/W R/W R/W R/W R/W

Initial val. 0 0 0 0 0 0 0 0

【0xCA – 0xCC : Value of the threshold for "Off → On"】

Name: ON0、ON1、ON2

Address: 0xCA – 0xCC

Description: These registers are used for setting the threshold of the “Off → On” operation. You can set 3 values for

threshold. If the 8bit ADC value of each sensor (register SENS_DATA) is larger than this value, then the

“Off → On” operation of the sensor is valid. Thes e values are assigned to each sensor by register GA_SIN

including ON_SIN.

The settable range ： 0x00 ＜ OFF ＜ ON ＜ 0xFF

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0xCA ON0[7] ON0[6] ON0[5] ON0[4] ON0[3] ON0[2] ON0[1] ON0[0]

0xCB ON1[7] ON1[6] ON1[5] ON1[4] ON1[3] ON1[2] ON1[1] ON1[0]

0xCC ON2[7] ON2[6] ON2[5] ON2[4] ON2[3] ON2[2] ON2[1] ON2[0]

R/W R/W R/W R/W R/W R/W R/W R/W R/W

Initial val. 0 0 0 0 0 0 0 0

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TSZ22111・15・001

【0xCD : Value of the threshold for "On → Off"】

Name: OFF

Address: 0xCD

Description: This register is used for setting the threshold for “On → Off” operation. If the 8bit ADC value of each sensor

(register SENS_DATA) is smaller than this value, then the “On → Off” operation of the sensor is enabled.

The setting range ： 0x00 ＜ OFF ＜ ON ＜ 0xFF

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0xCD - OFF [6] OFF [5] OFF [4] OFF [3] OFF [2] OFF [1] OFF [0]

R/W - R/W R/W R/W R/W R/W R/W R/W

Initial val. - 0 0 0 0 0 0 0

【0xCE :Chattering cancel】

Name: OVERSAMPLES

Address: 0xCE

Description: OST[3:0]：This register has the number of times of over sampling for canceling chattering in the “ON” or

“OFF” operation.

The continuous button level of over sampling frequency + three times or less is disregarded.

If the register value is 0, then the number of times of over sampling is 1.

Sampling rate：About 6m se c.

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0xCE OST[3] OST[2] OST[1] OST[0] - - - -

R/W R/W R/W R/W R/W - - - -

Initial val. 0 0 0 0 - - - -

【0xCF :Long press】

Name: CONTTIMES

Address: 0xCF

Description: CONTSEL：The output patt ern of an interru pt generat ed after recogniz in g long pre ss is set up.

1 : Every continuous touch period.

0 : First detect only.

CONT[5:0]：Continuous touch period is about 0.036 [sec] x CONT.

If the setting value is 0x0, continuous touch function is invalid.

(0.036sec ≦ Continuous touch period ≦2.3sec)

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0xCF CONTSEL - CONT[5] CONT[4] CONT[3] CONT[2] CONT[1] CONT[0]

R/W R/W - R/W R/W R/W R/W R/W R/W

Initial val. 0 - 0 0 0 0 0 0

【0xD0, 0xD2, 0xD3 : Mask switch operation 】

Name: MSK_SW_KEY

Address: 0xD0, 0xD2, 0xD3

Description: This register is used for masking the operation of each matrix switches and each simple switches. The

masked switches are excluded from the interrupt factor. It is prohibited to assign one sensor to both matrix

switch and a simple switch. Unused switches must be masked.

1 : Masked. 0 : Unmasked.

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0xD0 MSK_SW7 MSK_SW6 MSK_SW5 MSK_SW4 MSK_SW3 MSK_SW2 MSK_SW1 MSK_SW0

0xD2 MSK_KEYH MSK_KEYG MSK_KEYF MSK_KEYE MSK_KEYD MSK_KEYC MSK_KEYB MSK_KEYA

0xD3 MSK_KEYP MSK_KEYO MSK_KEYN MSK_KEYM MSK_KEYL MSK_KEYK MSK_KEYJ MSK_KEYI

R/W R/W R/W R/W R/W R/W R/W R/W R/W

Initial val. 0 0 0 0 0 0 0 0

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TSZ22111・15・001

【0xD9 : Slider】

Name: EN_SLIDER

Address: 0xD9

Description: EN_SLID_SIN [7:0]: It is used for enabling a sensor for a slider.

The sensor by which 1 was set is enabled as a slider. The order is SIN0, 1, 2, 3, 4, 5, 6, and 7, and the

disabled sensor is skipped. For example, when only SIN1, 2, 5, and 6 are enabled, the order is SIN1, 2, 5,

6. Moreover, when SLIDER_LOOP (0xE0 2) is enabled, SIN7 and SIN0 are processed as a consecutive

sensor. When touch is detected in any of the sensors operating in intermittent mode, all enabled sensors

start sen sing.

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0xD9 EN_SLID_SIN7 EN_SLID_SIN6 EN_SLID_SIN5 EN_SLID_SIN4 EN_SLID_SIN3 EN_SLID_SIN2 EN_SLID_SIN1 EN_SLID_SIN0

R/W R/W R/W R/W R/W R/W R/W R/W R/W

Initial val. 0 0 0 0 0 0 0 0

【0xDA : Keep intermittent sensing】

Name: KEEP_SENS_NUM

Address: 0xDA

Description: KEEP_SENS_NUM[7:0] : This is used for setting how long sensing operates from last intermittent

operation.

It works only in the intermittent operation.

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0xDA KEEP_SENS_

NUM[7] KEEP_SENS_

NUM[6] KEEP_SENS_

NUM[5] KEEP_SENS_

NUM[4] KEEP_SENS_

NUM[3] KEEP_SENS_

NUM[2] KEEP_SENS_

NUM[1] KEEP_SENS_

NUM[0]

R/W R/W R/W R/W R/W R/W R/W R/W R/W

Initial val. 0 0 0 0 0 0 0 0

【0xDB : Frequency of normal sensing during check sensing】

Name: UNIT_SENS_NUM

Address: 0xDB

Description: UNIT_SENS_NUM[3:0] : It is used to set the number of times normal sensing is done during check sensing

for intermittent return. It works only in the intermittent operation. The number of times normal sensing is

done is equal to the set value + 1.

For example, when 3 is set up, it becomes check -> Normal -> Normal -> Normal -> Normal -> check ->

Normal -> Normal --.

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0xDB - - - -

UNIT_SENS_NUM

[3] UNIT_SENS_NUM

[2] UNIT_SENS_NUM

[1] UNIT_SENS_NUM

[0]

R/W R/W R/W R/W R/W R/W R/W R/W R/W

Initial val. 0 0 0 0 0 0 0 0

【0xDC : Intermittent operation return threshold setting 】

Name: TH_SLEEP_H

Address: 0xDC

Description: TH_SLEEP[15:8] : It is the upper 8 bits of the return threshold value from intermittent operation to normal

operation. The lower 8 bits is register 0xDD. When the result of check sensing shifts from the median and

more than this threshold value, that sensor is returned from intermittent operation and normal sensing

operates.

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0xDC TH_SLEEP[15] TH_SLEEP[14] TH_SLEEP[13] TH_SLEEP[12] TH_SLEEP[11] TH_SLEEP[10] TH_SLEEP[9] TH_SLEEP[8]

R/W R/W R/W R/W R/W R/W R/W R/W R/W

Initial val. 0 0 0 0 0 0 0 0

【0xDD : Intermittent sensing return threshold setting 】

Name: TH_SLEEP_L

Address: 0xDD

Description: TH_SLEEP[7:0] : It is the lower 8 bits of the return threshold value from intermittent operation to normal

operation. Please refer to register 0xDC.

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0xDD TH_SLEEP[7] TH_SLEEP[6] TH_SLEEP[5] TH_SLEEP[4] TH_SLEEP[3] TH_SLEEP[2] TH_SLEEP[1] TH_SLEEP[0]

R/W R/W R/W R/W R/W R/W R/W R/W R/W

Initial val. 0 0 0 0 0 0 0 0

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TSZ22111・15・001

【0xDE : Sensor value offset setting 】

Name: OUTPUT_OFFSET

Address: 0xDE

Description: OUTPUT_OFFSET[7:0] : The offset added to the sensor value output to SD_SIN0-SD_SIN8(0x00-0x08) is

set. When the calibration is completed, these sensor values reach the value of about 0.Therefore, it is

shown as 0, and doesn't acquire an accurate value when swinging to negative. When offset is added,

monitoring data at the minus side and acquiring an accurate value becomes possible.

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0xDE OUTPUT_

OFFSET[7] OUTPUT_

OFFSET[6] OUTPUT_

OFFSET[5] OUTPUT_

OFFSET[4] OUTPUT_

OFFSET[3] OUTPUT_

OFFSET[2] OUTPUT_

OFFSET[1] OUTPUT_

OFFSET[0]

R/W R/W R/W R/W R/W R/W R/W R/W R/W

Initial val. 0 0 0 0 0 0 0 0

【0xDF : Mask interrupt】

Name: MSK_INTERRUPT

Address: 0xDF

Description: This register is for masking the interrupt factor. The masked interrupt factor is not shown on the register

"Interrupt factor (address 0x10)", so it does not affect the output port INT.

1 : Masked. 0 : Unmasked.

MSK_CAL : Mask for Software-calibration finish.

This bit is used for masking the interrupt of Software-calibration finish (the bit CAL in the register

INTERRUPT(address 0x10)).

MSK_ERCAL : Mask for Self-calibration finish.

This bit is used for masking the interrupt of Self-calibration finish (the bit ERCAL in the register

INTERRUPT(address 0x10)).

MSK_WDT : Mask for watch dog timer.

This bit is used for masking the interrupt of initialization by WDT.

WDT of register interrupt factor (address 0x10) is masked.

MSK_PERCAL : Mask for Periodic calibration finish.

This bit is used for masking the interrupt of Periodic calibration finish (the bit PERCAL in the register

INTERRUPT(address 0x10)).

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0xDF - - -

MSK_PERCAL MSK_WDT- MSK_ERCAL MSK_CAL -

R/W - - - R/W R/W R/W R/W -

Initial val. - - - 0 -0 0 0 -

【0xE0 : Operation mode setting0】

Name: MODE_CONFIG0

Address: 0xE0

Description: FIX_BASE_CYC : Sensing frequency is changed at the time of calibration failure, and returns the error

occurrence time. The noise measure function is disabled.

FIX_SNS_CYC : The noise measures function to change the frequency of sensing to each sensing is

invalidated.

SLID_LOOP : Process which treats CH recognized as a slider like a sensor continuous like

SIN6->SIN7->SIN0 and SIN1 ->SIN0 ->SIN7 is enabled.

EN_DSLP : The main clock is stopped when the main clock is not necessary while intermittent is operating

and the operating current is lowered.

EN_SLP : Inter mitt ent operat io n is activ ated and the operating current is lowered.

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0xE0 - - FIX_BASE

_CYC FIX_SNS

_CYC - SLID_LOOP EN_DSLP EN_SLP

R/W R/W R/W R/W R/W R/W R/W R/W R/W

Initial val. 0 0 0 0 0 0 0 0

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TSZ22111・15・001

【0xE1 : Operation mode setting1】

Name: MODE_CONFIG1

Address: 0xE1

Description: DIS_SIN8: Disables SIN8 for noise detection. Since sensing is not done when it is disabled, the operating

current decreases.

RERCAL_DIS : Disables regular calibration.

RET_DIS : Disables return calibration. 1: disable function.

HOP_DIS : Disables hopping calibration. 1: disable function.

ERROR_DIS : Disables error calibration. 1: disable function.

DRIFT_DIS : Disables drift calibration. 1: disable function.

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0xE1 DIS_SIN8 - -

RERCAL_DIS RET_DIS HOP_DIS ERROR_DIS DRIFT_DIS

R/W R/W R/W R/W R/W R/W R/W R/W R/W

Initial val. 0 0 0 0 0 0 0 0

【0xE2 : Effective sensor setting 】

Name: EN_SIN

Address: 0xE2

Description: EN_SIN[7:0]: Enables sensors

The sensor by which 1 was set is enabled. Sensing is done only when the sensor is enabled. Disabling

unnecessary sensors can lower current consumption.

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0xE2 EN_SIN[7] EN_SIN[6] EN_SIN[5] EN_SIN[4] EN_SIN[3] EN_SIN[2] EN_SIN[1] EN_SIN[0]

R/W R/W R/W R/W R/W R/W R/W R/W R/W

Initial val. 0 0 0 0 0 0 0 0

【0xE3 : Data compare frequency setting】

Name: SENS_NUM

Address: 0xE3

Description: SENS_NUM[7:0] : The number of times data comparison is performed during 1 time of sensing .

Increasing the value also increases the accuracy but time and its current consumption also increases.

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0xE3 SENS_NUM[7] SENS_NUM[6] SENS_NUM[5] SENS_NUM[4] SENS_NUM[3] SENS_NUM[2] SENS_NUM[1] SENS_NUM[0]

R/W R/W R/W R/W R/W R/W R/W R/W R/W

Initial val. 0 0 0 0 0 0 0 0

【0xE4 : Normal sensing timing setting 1 】

Name: SENS_RD_TIME

Address: 0xE4

Description: SENS_RD_TIME [7:0] : Comparator initial waiting time at normal sensing.

The time of one normal sens ing increases by increasing the value.

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0xE4 SENS_RD_

TIME[7] SENS_RD_

TIME[6] SENS_RD_

TIME[5] SENS_RD_

TIME[4] SENS_RD_

TIME[3] SENS_RD_

TIME[2] SENS_RD_

TIME[1] SENS_RD_

TIME[0]

R/W R/W R/W R/W R/W R/W R/W R/W R/W

Initial val. 0 0 0 0 0 0 0 0

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TSZ22111・15・001

【0xE5 : Normal sensing timing setting 2 】

Name: SENS_RST_TIME

Address: 0xE5

Description: SENS_RST_TIME [7:0] : Setting of normal sensing at impressed time.

The time of normal sensing increases by increasing the value.

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0xE5 SENS_RST_

TIME[7] SENS_RST_

TIME[6] SENS_RST_

TIME[5] SENS_RST_

TIME[4] SENS_RST_

TIME[3] SENS_RST_

TIME[2] SENS_RST_

TIME[1] SENS_RST_

TIME[0]

R/W R/W R/W R/W R/W R/W R/W R/W R/W

Initial val. 0 0 0 0 0 0 0 0

【0xE6 : Normal sensing timing setting 3 】

Name: SENS_IRST_TIME

Address: 0xE6

Description: SENS_IRST_TIME [7:0] : Setting of normal sensing at initial impressed time.

The time of normal sensing increases by increasing the value.

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0xE6 SENS_IRST_

TIME[7] SENS_IRST_

TIME[6] SENS_IRST_

TIME[5] SENS_IRST_

TIME[4] SENS_IRST_

TIME[3] SENS_IRST_

TIME[2] SENS_IRST_

TIME[1] SENS_IRST_

TIME[0]

R/W R/W R/W R/W R/W R/W R/W R/W R/W

Initial val. 0 0 0 0 0 0 0 0

【0xE7 : Datacompare frequency setting at check sensing】

Name: CHK_NUM

Address: 0xE7

Description: CHK_NUM[7:0] : Frequency of data comparison by check sensing and one time of calibration sensing.

Increasing the value also increases the accuracy but sensing time and its current consumption also

increases.

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0xE7 CHK_NUM[7] CHK_NUM[6] CHK_NUM[5] CHK_NUM[4] CHK_NUM[3] CHK_NUM[2] CHK_NUM[1] CHK_NUM[0]

R/W R/W R/W R/W R/W R/W R/W R/W R/W

Initial val. 0 0 0 0 0 0 0 0

【0xE8 : Check sensing timing setting1 】

Name: CHK_RD_TIME

Address: 0xE8

Description: CHK_RD_TIME [7:0] :Setting of comparator initial waiting time for check sensing and calibration sensing.

Increasing the value also increases the time for one sensing.

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0xE8 CHK_RD_

TIME[7] CHK_RD_

TIME[6] CHK_RD_

TIME[5] CHK_RD_

TIME[4] CHK_RD_

TIME[3] CHK_RD_

TIME[2] CHK_RD_

TIME[1] CHK_RD_

TIME[0]

R/W R/W R/W R/W R/W R/W R/W R/W R/W

Initial val. 0 0 0 0 0 0 0 0

【0xE9 : Check sensing timing setting 2 】

Name: CHK_RST_TIME

Address: 0xE8

Description: CHK_RST_TIME [7:0] : Setup time setting for check sen sin g and cali brat ion sensing.

Increasing the value also increases the time for one sensing.

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0xE9 CHK_RST_

TIME[7] CHK_RST_

TIME[6] CHK_RST_

TIME[5] CHK_RST_

TIME[4] CHK_RST_

TIME[3] CHK_RST_

TIME[2] CHK_RST_

TIME[1] CHK_RST_

TIME[0]

R/W R/W R/W R/W R/W R/W R/W R/W R/W

Initial val. 0 0 0 0 0 0 0 0

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TSZ22111・15・001

【0xEA : Check sensing timing setting 3 】

Name: CHK_IRST_TIME

Address: 0xEA

Description: CHK_IRST_TIME [7:0] : Setup time setting for check sensing and calibration sensing. The value also

increa ses the time for one s ensing.

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0xEA CHK_IRST_

TIME[7] CHK_IRST_

TIME[6] CHK_IRST_

TIME[5] CHK_IRST_

TIME[4] CHK_IRST_

TIME[3] CHK_IRST_

TIME[2] CHK_IRST_

TIME[1] CHK_IRST_

TIME[0]

R/W R/W R/W R/W R/W R/W R/W R/W R/W

Initial val. 0 0 0 0 0 0 0 0

【0xEB : Digital gain setting 】

Name: DIG_GAIN

Address: 0xEB

Description: CHK_DIG_GAIN [3:0]: The digital gain result at the time of check sensing and calibration sensing is shifted

to the right only by the set value. The sensor value obtained with 0x00-0x08 is the value after the digital

gain is applie d.

SENS_DIG_GAIN [3:0]: Digital gain at the time of normal sensing

The result is shifted to the right only by the set value.

Moreover, the sensor value obtained with 0x00-0x08 is the value after the digital gain is applied.

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0xEB CHK_DIG_

GAIN[3] CHK_DIG_

GAIN[2] CHK_DIG_

GAIN[1] CHK_DIG_

GAIN[0] SENS_DIG_

GAIN[3] SENS_DIG_

GAIN[2] SENS_DIG_

GAIN[1] SENS_DIG_

GAIN[0]

R/W R/W R/W R/W R/W R/W R/W R/W R/W

Initial val. 0 0 0 0 0 0 0 0

【0xEC : Setting at intermittent operation time 】

Name: CHK_WAIT_TIME

Address: 0xEC

Description: CHK_WAIT_TIME [7:0] : It decides the execution interval between the check sensing and the next check

sensing. Corresponds to check intervals when all sensors are judged OFF through touch judgement of

check sens ing. Check interval = (set value + 1) X 4 ms

When ON judgment is done, the check sensing interval is decided by the sensing execution interval.

Intermittent sensing is applied only when it is enabled.

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0xEC CHK_WAIT

TIME[7] CHK_WAIT

TIME[6] CHK_WAIT

TIME[5] CHK_WAIT

TIME[4] CHK_WAIT

TIME[3] CHK_WAIT

TIME[2] CHK_WAIT

TIME[1] CHK_WAIT

TIME[0]

R/W R/W R/W R/W R/W R/W R/W R/W R/W

Initial val. 0 0 0 0 0 0 0 0

【0xED : Setting at normal sensing waiting time 】

Name: SENS_WAIT_TIME

Address: 0xED

Description: SENS_WAIT_TIME [7:0] : Waiting time until the next sensing starts.

Normal sensing interval = set value x 4 ms

When 0 is set, the next sensing starts after the MPU calculation ends.

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0xE0 SENS_WAIT

_TIME[7] SENS_WAIT

_TIME[6] SENS_WAIT

_TIME[5] SENS_WAIT

_TIME[4] SENS_WAIT

_TIME[3] SENS_WAIT

_TIME[2] SENS_WAIT

_TIME[1] SENS_WAIT

_TIME[0]

R/W R/W R/W R/W R/W R/W R/W R/W R/W

Initial val. 0 0 0 0 0 0 0 0

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【0xEE : Calibration setting 0 】

Name: CALIB_CONFIG0

Address: 0xEE

Description: RET_NUM[7:0] : Frequency setting for Calibration

The return calibration starts when the sensing that touch detection is not performed and it is operated

continuously more than the setting value after returning from intermittent operation to normal operation.

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0xE0 RET_NUM[7] RET_NUM[6] RET_NUM[5] RET_NUM[4] RET_NUM[3] RET_NUM[2] RET_NUM[1] RET_NUM[0]

R/W R/W R/W R/W R/W R/W R/W R/W R/W

Initial val. 0 0 0 0 0 0 0 0

【0xEF : Calibration setting 1 】

Name: CALIB_CONFIG1

Address: 0xEF

Description: PRECAL_PERIOD [7:4]: Setting at cyclic calibration execution intervals

When either of the next conditions is filled, a cyclic calibration is executed.

Sleep function disabled and (setting value +1) x 500 >= the number of sensing

Sleep function enabled and (setting value +1) x 50 >= the number of check sensing

DRIFT_SIM_NUM[3:0]: Number of drift calibration detection sensor channels

When the drift detected with the sensor channel is more than this setting value, the drift calibration is

activated.

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0xE0 PRECAL_

PERIOD [7] PRECAL_

PERIOD [6] PRECAL_

PERIOD [5] PRECAL_

PERIOD [4] DRIFT_SIM_

NUM[3] DRIFT_SIM_

NUM[2] DRIFT_SIM_

NUM[1] DRIFT_SIM_

NUM[0]

R/W R/W R/W R/W R/W R/W R/W R/W R/W

Initial val. 0 0 0 0 0 0 0 0

【0xF0 : Clear inte rrupt】

Name: CLR_INTERRUPT

Address: 0xF0

Description: Clear Interrupt Register

C_INI : Clear Interrupt of Initialization finish.

Clears the INI interrupt by writing ‘0’ in this register.

C_CAL : Clear Interrupt of Software-calibration finish.

Clears the CAL interrupt by writing ‘0’ in this regi ster.

C_ERCAL : Clear Interrupt of Self-calibration fi nish.

Clears the ERCAL interrupt by writing ‘0’ in this register.

C_WDT : '0' is set when clearing the bit WDT of the interrupt factor register.

C_PERCAL : Clear Interrupt of Periodic calibration finish.

Clears the PERCAL interrupt by writing ‘0’ in this register.

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0xF0 - - - C_PERCAL C_WDT C_ERCAL C_CAL C_INI

R/W - - - R/W R/W R/W R/W R/W

Initial val. - - - 0 0 0 0 0

【0xF1, 0xF3 : Clear Switch-ON】

Name: CLR_DETECT_ON

Address: 0xF1, 0xF3

Description: DETECT_ON Clear Register. Clear the DETECT_ON by writing ‘0’ in these registers. If you write ‘1’,

the operation is disabled. SW 0-15 has individual clear bit because SW 0-15 supports multiple

presses. The matrix key’s DETECT_ON clear bit is 1bit for MAT because the matrix key does not

support mult ipl e press.

1 : Invalid. 0 :Clear.

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0xF1 C_SW7_ON C_SW6_ON C_SW5_ON C_SW4_ON C_SW3_ON C_SW2_ON C_SW1_ON C_SW0_ON

0xF3 C_MAT_ON - - - - - - -

R/W R/W R/W R/W R/W R/W R/W R/W R/W

Initial val. 0 0 0 0 0 0 0 0

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【0xF4, 0xF6 : Clear Switch-OFF】

Name: CLR_DETECT_OFF

Address: 0xF4, 0xF6

Description: DETECT_OFF Clear Register. Clears the DETECT_OFF by writing ‘0’ in these registers. If you write

‘1’, the operation is disabled. SW 0-7 has individual clear bit because SW 0-7 supports multiple

press. The matrix key’s DETECT_OFF clear bit is 1bit for MAT because the matrix key does not

support mult ipl e press.

1 : Invalid. 0 :Clear.

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0xF4 C_SW7_OFF C_SW6_OFF C_SW5_OFF C_SW4_OFF C_SW3_OFF C_SW2_OFF C_SW1_OFF C_SW0_OFF

0xF6 C_MAT_OFF - - - - - - -

R/W R/W R/W R/W R/W R/W R/W R/W R/W

Initial val. 0 0 0 0 0 0 0 0

【0xF5 : Slider Off recognition clea r 】

Name: CLR_DETECT_SLIDER_OFF

Address: 0xF5

Description: C_SLIDER_OFF: Clear Slider off detection flag

SLIDER_OFF (0x17 7) is cleared by writing 0. The next slider is not detected until this flag is cleared.

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0xF4 C_SLIDER

_OFF - - - - - - -

R/W R/W R/W R/W R/W R/W R/W R/W R/W

Initial val. 0 0 0 0 0 0 0 0

【0xF7-0xF9 : Clear continuous touch】

Name: CLR_DETECT_CONT

Address: 0xF7-0xF9

Description: DETECT_CONT Clear Register. Clears the DETECT_CONT by writing ‘0’ in these registers. If you

write ‘1’, the operation is disabled. SW 0-7 has individual clear bit because SW 0-7 supports multiple

press. The matrix key’s DETECT_CONT clear bit is 1bit for MAT because the matrix key does not

support mult ipl e press.

1 : Invalid. 0 :Clear.

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0xF7 C_SW7_CONT C_SW6_CONT C_SW5_CONT C_SW4_CONT C_SW3_CONT C_SW2_CONT C_SW1_CONT C_SW0_CONT

0xF9 C_MAT_CONT - - - - - - -

R/W R/W R/W R/W R/W R/W R/W R/W R/W

Initial val. 0 0 0 0 0 0 0 0

【0xFE : Write register for operation check of MPU】

Name: WACT

Address: 0xFE

Description: This register is a write register for operational check of the IC. The value written to this register is copied to

the register for operation check (Address is 0x1E). If the write value with the read value is equal then the

MPU and I/F are operating normally.

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0xFE WACT[7] WACT[6] WACT[5] WACT[4] WACT[3] WACT[2] WACT[1] WACT[0]

R/W R/W R/W R/W R/W R/W R/W R/W R/W

Initial val. 0 0 0 0 0 0 0 0

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【0xFF : AFE control】

Name: CNT

Address: 0xFF

Description: This register is for controlling AFE.

ACT : Scan Enable：

This bit is the scan enable for sensors. 1:Normal Scan Enable. 0 :Normal S can D i sable.

CAL : Act Softw are-calibration：

The calibration is operated by setting '1'.

CFG : Enable Configuration Value：

Writing ‘1’ to this bit renew the values of Sensor Configuration (Address 0xC0-0xCF), Mask Configuration

except for 0xDF(Address 0xD0-0xDE), Analog setting Configuration (Address 0xE0-0xEF), FRCRLS and

CALOVF. Also It affect the IC’s operation.

CALMOD : Select Software-calibration mode：

0: All sensors are the targets for software-calibration. If some sensor has the value more than the threshold

for "Off→On", the sensors are changed to OFF, and DETECT_OFF registers are enabled. (default)

1: Sensors with value more than the threshold for "Off→On are not included”

CALOVF : Select Self-calibration mode detected overflow：

When the periodic calibration is active, it selects whether to activate self-calibration or not to activate in the

case that the sensor values are over the dynamic range of included ADC.

0: Deactivate self-calibration (default) 1: Activate self-c alibration.

FRCRLS : Select Force OFF at continued touch：

When the continued touch is active, select whether to activate force OFF or not in the case that the max

value after detect continued touch minus the current sensor value is more than the threshold for "Off→On”.

0: Deactivate force OFF(default) 1:Activate force OFF.

The continued touch sensor is changed to OFF, and DETECT_OFF register is enabled.

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0xFF FRCRLS CALOVF - CALMOD - CFG CAL ACT

R/W R/W R/W - R/W - R/W R/W R/W

Initial val. 0 0 - 0 - 0 0 0

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Tim ing Charts

●Host interface

2-wire serial bus.

Compatible with I2C protocol.

Support s slave mod e only.

Slave Address = 0x5C

Supports Standard-mode (data transfer rate is 100 kbit/s) and Fast-mode (data transfer rate is 400 kbit/s ).

Support s sequential read.

START

SDA

SCL

STOP

Address R/W ACK ACK ACK

Data Data

Standard-mode Fast-mode

Parameter Symbol MIN MAX MIN MAX Unit

Hold time (repeated) START condition fSCL 0 100 0 400 kHz

LOW period of the SCL clock tHD;STA 4.0 - 0.6 - µsec

HIGH period of the SCL clock tLOW 4.7 - 1.3 - µsec

Data hold ti me tHIGH 4.0 - 0.6 - µsec

Data set-up time tHD;DAT 0.1 3.45 0.1 0.9 µsec

Set-up time for a repeated START condition tSU;DAT 0.25 - 0.1 - µsec

Set-up time for STOP condition tSU;STA 4.7 - 0.6 - µsec

Bus free time between a STOP and START condition tSU;STO 4.0 - 0.6 - µsec

Hold time (repeated) START condition tBUF 4.7 - 1.3 - µsec

Fig 8. 2-wire serial bus timing chart

Fig 7. 2-wire serial bus data format

SDA

SCL

START Address ACK Data Data ACK STOP

NACK

/ ACK

R/W

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Slave Address

=0x5C

(n)

Write Data

to Register

(Register Address

=n)

●Byte Write

Slave Address

=0x5C

(n)

Slave Address

=0x5C

●Random Read

Read Data

from Register

(Register Address

=n)

Slave Address

=0x5C

(n)

Slave Address

=0x5C

●Sequential Read

Read Data

from Register

(Register Address

=n)

Read Data

from Register

(Register Address

=n+x)

SA : Slave Address

RA : Register Address

RD : Read Data

WD : Write Data

Figure 9. 2-wire serial bus protocol

Scan rate

After scanning each sensor in time series, MPU converts the detected results to switch operations. One scan rate is

about 6msec at typical.

Figure 10. Timing chart of scan rate

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Power on sequence

The power supply pin is only VDD. Because AVDD and DVDD are generated by a built-in LDO, there is no need for an

external supply. The internal reference voltage is started up by the VDD supply, and DVDD starts up continuously.

Power-on reset is released when DVDD reaches the required voltage.

When power-on-reset is released, MPU starts initial sequence. INT port informs the host that the initialization

has been completed. After verifying if the initialization is completed, the host will need to send the command to the

IC. In the case that WDTR is released as well, MPU starts initial sequence. If WDTR is released, all registers have

been initialized so the host will need to resend the command to the IC.

C1 0.1µF VDD decoupling capacitor

C2 1.0µF DVDD decoupling capacitor

C3 2.2µF AVDD decoupling capacitor

Recommended value of external capacitors

Figure 11. Arrangement of external decoupling capacitors

Figure 13. Timing chart of initialization

VDD

Power

on reset

I2C

STATE

INT

RST CPUON

(Initialize)

CPUON

(Sensing)

INTE

CLR

Start

sensing

VDD

DVDD

Power

On Reset

3.3V

1.5V

Internal

Signal

Over 100usec

GND

VDD

C1BU21079F

VDD

VSS

AVDD

DVDD

Figure 12. Power on sequence

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Operational mo de

This IC has three operational modes, [Stop mode], [Intermittent mode], and [Normal mode].

【Stop mode】

It is the state where detection is disabled.

Detection is stopped by setting '0' to ACT of the sensor motion control register CNT (address 0xFF).

A detection process is stopped and consumption current decreases by performing the power down of AFE.

【

Normal mode 】

In normal mode, dete cti on is cont inuo us.

Sensing is started by setting '1' to ACT of the sensor motion control register CNT (address 0xFF).

Starting detection and soft calibration is operated simultaneously.

Sensing in normal mode is def ined as norm al sen si ng.

【Intermittent mode】

Detection is thinned out. If the touch detection beyond a definite period of time is not recognized, it will shift to

intermittent operation. In this state, since the frequency of sensing is low, current consumption can be reduced.

Sensing in intermittent operation is defined as check sensing.

Operation

Standby

Normal

Standby

calculation

Operation

Standby

Normal

Standby

calculation

【　Normal operation　】

①An effective sensor is sensing by the SENS setting.

Operation

MPU

Analog

SIN0

SIN1

SIN2

SIN3

Standby

Operation

Standby

Normal

calculation

Standby

Operation

Standby

Normal

Standby

calc ulati on

Standby

BBB

D: Sensing time of each sensor

【　Intermittent operation　】

①All sensors are checked sensing by each CHK setting of the register.

②The sensor of ON judgment is done normal sensing by the check sensing result, and it uses it for the touch judgment that outputs only the result.

③It stands by until time equal with all channel sensing when sensors of ON judgment are less than 8 channels in the check sensing result.

④It stands by at time that even the next check timing was set when there is no sensor of ON judgment in the check sensing result.

⑤The frequency of the sensor while check sensing is operated is specified by the register. Minimum is 1 time. (A below figure is shown twice.)

A: Check waiting time. It is possible to set it at CHK_WAIT_TIME. (About 4 to 1024ms)

B: Sense wait ing time . It is possible to set it at SENS_WA IT_TIME. (About 0 to 1020ms)

C: Sense adjustment time. It changes accord ing to the number of sensors in which not sensing. (About 4ms unit)

StandbyOperation

calculation

Standby

Check

Operation

Standby

Normal

Standby

calculation

Operation

Standby

Normal

Standby

calculation

StandbyOperation

calcu lati on

Standby

Check

Operation

Standby

Normal

Standby

calculation

OFF

Standby

Standby Operation

Standby

Normal

Standby

calculation

Standby

StandbyStandbyOperation

calculation

Standby

Check

OFF

Standby

Opetration

MPU

Analog

SIN0

SIN1

SIN2

SIN3

Standby

A B B

Standby

BC C

Standby Standby

Standby

Figure14. Operation sequence of normal operation and intermittent operation

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Initialized operation

This IC is initialized and all registers are cleared by Power-on reset, WDT time-out reset, and Software reset command.

When initialization is complete, the register INI is '1' and I/O port INT is “H”.

After the IC is initialized, write the configuration values to registers. After setting configuration values, the next action is

sensor calibration. Set ‘1’ to the registers ACT, CFG and CAL on Address 0xFF, and calibration sequence is performed.

The initialization process after the ROM hardware reset

- Power activation

- WDT timeout

- Software reset

Also in the case of hardware reset by any, all the register is cleared.

Since reset to MPU is also operated, MPU follows the firmware in Program ROM and initializes IC.

Figure15. The init ial iz atio n pr oc ess af ter hardw are reset

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The relation of sequence after power on and interrupt

After power on, a system reset is performed by the power-on-reset circuit inside the IC, and download of firmware from ROM

is started. When downloading of the firmware is completed, the initialization is finished. Since interrupt is active, please send an

interrupt clear command. Calibration starts to setup CNT (0xFF) =03h. Since interrupt is active after finishing, please send an interrupt

clear command.

Figure16. The setting processes after a system reset and interrupt, and interrupt clear.

IC is initialized About 300μsec Update sensor

setting value

In calibration

Send soft calibration command

Send detect enable command

Send clear command for interrupt of finishing initialization

Send clear command for interrupt of finishing calibration

Firmware download

VDD

RESET

(Active Low)

CPU RESET

(Active Low)

Soft calibration

Detect enable

Interrupt of finishing initialization

Interrupt of finishing calibration

INT

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Calibration

There are three kinds of calibration: soft calibration, period calibration and recalibration according to error.

There are four kinds of recalibration according to error: drift calibration, calib-error calibration, hopping calibration and

return calibration .

Soft calibration (CAL)

When the sensor setting value is changed, it is necessary to execute a soft calibration.

When a soft calibration ends, soft calibration end interrupt bit is '1' and INT (interrupt) pin is active.

Interrupt by soft calibration completion have mask func tion. (0: Off mask 1: On mask).

Bit of the soft calibration end interrupt is cleared by writing '0'.

When a soft calibration is operated, the register by the result of detecting the sensor value and the switch operation

that has been detected is cleared.

IC doesn’t update sensor value during calibration, therefore, the sensor operation is also disabled.

The calibration is operated by the next sampling while a soft calibration is sent during the sensor sampling.

0xFF(CALMOD) can set soft calibration execution for ON detection sensor in touch.

Period calibr atio n (PERCAL)

The execution of self calibration can be selected at each passage at a fixed time. The selection of the

execution/non-execution selects registers 0xE1[4] (PERCAL_DIS 0: Execute period calibration, 1: disable period

calibration )

Calibration is not done for ON detection sensor in touch even when the period calibration is executed.

When the finger does not touch the sensor, the calibration is executed.

Whenever the period calibration is executed, an interrupt factor PERCAL is set '1' and INT (interrupt) pin is active.

Interrupt by period calibration completion have mask function (0: MASK Off , 1: MASK On).

Recalibration according to error (ERCAL)

When the next four situations are generated, the calibration is automatically executed. The completion of the

recalibration can be identified through the INT interrupt.

The mask function is prepared in the interrupt factor recalibration completion. (0: MASK Off, 1: MASK On).

The complet ion int errupt bit of the recali brati on is cleared by wr iting '0'.

１． Drift calibration

When the IC detects the drift condition, the IC activates self-calibration. When calibration is complete, the interrupt

factor register CAL is '1' and I/O port INT is “H”. When there is a sensor with a value more than the threshold for

"Off→On”, IC does not detect drift condition.

２．Calib-error calibration

When the finger is on the sensor at the calibration, the sensor base state is with the finger. Without the finger, the

sensor value is under the base state value. This abnormal condition is defined to be an incorrect operation. When

incorrect operation is detected, the IC activates self-calibration.

３．Hopping calibration

When the IC detects noise, the IC changes the scan rate so it does not synchronize with the noise, and the IC

activates self-calibration. When calibration is complete, the Interrupt factor register CAL is '1' and I/O port INT is “H”.

４．Return calibrat io n

Though it returned to normal operation from intermittent operation, when sensing not on detected is more than the

regulated frequency, self-calibration is executed, recalibration end interrupt bit become '1' and INT is output.

The frequency can be set by register 0xEE.

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Matrix Switch

The cross points of the sensors which are arranged in a matrix can be assigned to individual switches. The matrix

layout of the sensors is shown in Figure 17.

Each matrix switch has the registers of detected Touch (DETECT_ON) / Release (DETECT_OFF) / Hold

(DETECT_COND) operations. It is recommended to mask unused matrix switches. If there are unstructured matrix

switches (in the case that under 4x4 matrix layout), it is a must that the unstructured matrix switches are masked.

Matrix switches do not support multi-detect Touch/Release/Hold. The condition of acceptable matrix switch operation is

that every sensor’s value is under the threshold for "On→Off” and DETECT_OFF register of matrix switch is cleared. It

is a must that the matrix switches that are made by the sensor assigned to a simple switch are masked.

KEYA : KEY[3:0] = 0x00 KEYI : KEY[3:0] = 0x08

KEYB : KEY[3:0] = 0x01 KEYJ : KEY[3:0] = 0x09

KEYC : KEY[3:0] = 0x02 KEYK : KEY[3:0] = 0x0A

KEYD : KEY[3:0] = 0x03 KEYL : KEY[3:0] = 0x0B

KEYE : KEY[3:0] = 0x04 KEYM : KEY[3:0] = 0x0C

KEYF : KEY[3:0] = 0x05 KEYN : KEY[3:0] = 0x0D

KEYG : KEY[3:0] = 0x06 KEYO : KEY[3:0] = 0x0E

KEYH : KEY[3:0] = 0x07 KEYP : KEY[3:0] = 0x0F

SIN3（Sensor ON/OFF）

SIN5（Sensor ON/OFF）

←Sensor value SIN5 > SIN6

SIN6（Sensor ON/OFF）

Switch On recognition(MAT)

Switch Off recognition(MAT)

Object KEY 0xX 0x4(=KEYE) 0x8(=KEYI)

INT pin

Send interrupt clear command for recognition KEY OFF

When one is OFF in matrix switch,

the other is off as matrix switch.

Send interrupt clear command for recognition KEY ON

It is possible to recognise following key

after clear for interrupt of recognition key.

SIN3（Sensor ON/OFF）

SIN5（Sensor ON/OFF）

Recognition KEY ON(MAT)

Recognition long push(MAT)

Recognition KEY OFF(MAT)

Object KEY 0xX 0x4(=KEYE)

INT pin

Setting of long push (time) Setting of long push (time)

Send interrupt clear command for recognition long push Send interrupt clear command for recognition KEY OFF

Send interrupt clear command for recognition KEY ON

Figure 17. Layout for matrix sw itch

Figure 18. Interrupt of matrix switch (1)

Figure19. Interrupt of matrix switch (2)

KEYA KEYB KEYC KEYD

KEYE KEYF KEYG KEYH

KEYI KEYJ KEYK KEYL

KEYM KEYN KEYO KEYP

SIN7

SIN6

SIN5

SIN4

SIN3 SIN2 SIN1 SIN0

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Simple Switch

Every sensor is used for simple switch. Each simple switch has the registers of detected Touch/Release/Hold

operations. Simple switches support multi-detect Touch/Release/Hold. It is possible to mask each switch.

Case1 Long push setting CONTSEL = 1

SIN0（sensor ON/OFF）

key ON recognition(SW0)

key long push recognition(SW0)

key OFF recognition(SW0)

INT pin

Case2 Long push setting CONTSEL = 0

SIN0（sensor ON/OFF）

key ON recognition(SW0)

key long push recognition(SW0)

key OFF recognition(SW0)

INT pin

Setting of lon g push time Settin

of lon

ush time

Send clear command for interrupt of SW0 ON Send clear command for interrupt of SW0 long push Send clear command for interrupt of SW0

Setting of long push time

Send clear command for interrupt of SW0 ON Send clear command for interrupt of SW0 long push Send clear command for interrupt of SW0 OFF

SIN0（sensor ON/OFF）

key ON recognition(SW0)

key OFF recognition(SW0)

SIN1（sensor ON/OFF）

key ON recognition(SW1)

key OFF recognition(SW1)

INT pin

end clear command for interrupt of SW1 OFF

Send clear command for interrupt of SW1 ON

Send clear command for interrupt of SW0 ON Send clear command for interrupt of SW0 OFF

Figure 20. Interrupt of simple s w itch (1)

Figure21. Interrupt of simple switch (2)

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Application Examples

BU21079F offers 2 methods of switch. One method is simple switch, another method is matrix switch.

The maximum number of matrix switches that BU21079F can handle is 16.

BU21079F

TOP VIEW

0.1uF

VDD

2.2uF

HOST

SIN3

SIN2

SIN1

SIN0

SIN4

SIN5

SIN6

SIN7

AVDD

DVDD

VDD

VSS

1.0uF

VDD

12 TEST

INT

SDA

SCL

Figure 22. Application example 1. (Matrix 4 x 4 composition by BU21079F)

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Operational Notes

(1) Absolute Maximum Ratings

An excess in the absolute maximum ratings, such as supply voltage, temperature range of operating conditions,

etc., can break down the device, thus making it impossible to identify the reason for breakdown such as a short

circuit or an open circuit. If any special mode exceeding the absolute maximum ratings is assumed, consideration

should be given and apply safety measures including the use of fuses, etc.

(2) Operating conditions

These conditions represent the range within which characteristics can be provided approximately as expected.

The electrical characteristics are guaranteed under these conditions for each parameter.

(3) Reverse connection of power supply connector

The reverse connection of power supply can break down the IC. Take protective measures agains t the breakdown

due to the reverse connection by using methods such as mounting an external diode between the power supply

and the IC's power supply terminal.

(4) Power supply line

Design PCB trace to provide low impedance for the wiring between the power supply and the GND lines. In this

regard, for the digital block power supply and the analog block power supply, even though these power supplies

has the same level of potential, separate the power supply trace for the digital block from that of the analog block,

thus suppressing the diffraction of digital noises to the analog block power supply resulting from impedance

common to the trace. For the GND line, give consideration to design the trace in a similar manner.

Furthermore, for all power supply terminals of the ICs, mount a capacitor between the power supply and the GND

terminal. At the same time, when using an electrolytic capacitor, be sure that the characteristics of the capacitor to

be used will introduce no problem including the occurrence of capacity dropout at a low temperature, thus

determining the constant.

(5) GND voltage

Set the potential of the GND terminal so that it will be maintained at the minimum in any operating state.

Furthermore, ensure that no terminals are at a potential lower than the GND voltage including transient

conditions.

(6) Short circuit between terminals and erroneous mounting

When mounting ICs on a PCB, pay attention to the orientation of the ICs. Erroneous mounting can break down the

ICs. Furthermore, if a short circuit occurs due to foreign objects entering between terminals or between the

terminal and the power supply or the GND terminal, the ICs can break down.

(7) Operation in strong electromagnetic field

Please note that using the ICs in the presence of a strong electromagnetic field can cause malfunction.

(8) Inspection with set PCB

On the inspection wi th the set PCB, if a capacitor is connected to a low-impedance IC terminal, the IC can suffer

str ess. Th erefo re, be sure to disc harge capacit ors con nected t o the set PCB a fter e ach proc ess. Furthe rmore, i n

mounting or dismounting the set PCB to/from the jig for the inspection process, be sure to turn OFF the power

supply and then mount the set PCB to the jig. After the completion of the inspection, be sure to turn OFF the

power supply and then dismount it from the jig. In addition, for protection against static electricity, establish a

ground for the assembly process and pay thorough attention to the transportation and the storage of the set PCB.

(9) Input terminals

In terms of the construction of IC, parasitic elements are inevitably formed in relation to potential. The operation of

the parasitic element can cause interference with circuit operation, thus resulting in a malfunction and then

breakdown of the input terminal. Therefore, pay thorough attention not to handle the input terminals, such as to

apply to the input terminals a voltage lower than the GND respec tively, so that any parasitic element will operate.

Furthermore, do not apply a voltage to the input terminals when no power supply voltage is applied to the IC. In

addition, even if the power supply voltage is applied, apply to the input terminals a voltage lower than the power

supply voltage or within the guaranteed value of electrical characteristics.

32/34

Datasheet

BU21079F

TSZ02201-0Y1Y0FZ00150-1-2

www.rohm.com

TSZ22111・15・001

(10) Ground wiring pattern

If small-signal GND and large-current GND are provided it is recommended to separate the large-current GND

trace from the small-signal GND trace and establish a single ground at the reference point of the set PCB so that

resistance to the wiring pattern and voltage fluctuations due to a large current will cause no fluctuations in

voltages of the small-signal GND. Pay attention not to cause fluctuations in the GND wiring pattern of external

parts as well.

(11) External capacitor

When using a ceramic capacitor as the external capacitor, determine the value while also considering the

degradation in the nominal capacitance due to DC bias and changes in the capacitance due to temperature, etc.

(12) Rush current

When supplying power to the IC, a rush of current may occur due to the procedure and delay at power-on. Pay

attention to the capacitance of the coupling capacitors and the wiring pattern width and routing of the power

supply and the GND lines.

33/34

Datasheet

BU21079F

TSZ02201-0Y1Y0FZ00150-1-2

www.rohm.com

TSZ22111・15・001

Ordering Information

BU21079F

E 2

Part Number

Package

F: SOP16 Packaging and forming specification

E2: Embossed tape and reel

Line-up

Sensor ports Package Orderable Part Number

8ch SOP16 BU21079F-E2

Physical Dimension Tape and Reel Information

Marking Diagrams (TOP VIEW )

SOP16 (TOP VIEW)

BU21079

Part Number Marking

LOT Number

1PIN MARK

(Unit : mm)

SOP16

0.1

1.27

0.11

0.3MIN

10±0.2

0.15±0.1

0.4±0.1

1.5±0.1 6.2±0.3

4.4±0.2

(MAX 10.35 include BURR)

∗

Order quantity needs to be multiple of the minimum quantity.

Embossed carrier tapeTape

Quantity

Direction

of feed The direction is the 1pin of product is at the upper left when you hold

reel on the left hand and you pull out the tape on the right hand

2500pcs

()

Direction of feed

Reel 1pin

34/34

Datasheet

BU21079F

TSZ02201-0Y1Y0FZ00150-1-2

www.rohm.com

TSZ22111・15・001

Revision History

Date Revision Changes

2013.9.25 Rev.001 New

－－－

Datasheet

Notice - GE Rev.002

Notice

Precaution on using ROHM Products

1. Our Products are designed and manufactured for application in ordinary electronic equipments (such as AV equipment,

OA equipment, telecommunication equipment, home electronic appliances, amusement equipment, etc.). If you

intend to use our Products in devices requiring extremely high reliability (such as medical equipment (Note 1), transport

equipment, traffic equipment, aircraft/spacecraft, nuclear power controllers, fuel controllers, car equipment including car

accessories, safety devices, etc.) and whose malfunction or failure may cause loss of human life, bodily injury or

serious damage to property (“Specific Applications”), please consult with the ROHM sales representative in advance.

Unless otherwise agreed in writing by ROHM in advance, ROHM shall not be in any way responsible or liable for any

damages, expenses or losses incurred by you or third parties arising from the use of any ROHM’s Products for Specific

Applications.

(Note1) Medical Equipment Classification of the Specific Applications

JAPAN USA EU CHINA

CLASSⅢ CLASSⅢ CLASSⅡb CLASSⅢ

CLASSⅣ CLASSⅢ

2. ROHM designs and manufactures its Products subject to strict quality control system. However, semiconductor

products can fail or malfunction at a certain rate. Please be sure to implement, at your own responsibilities, adequate

safety measures including but not limited to fail-safe design against the physical injury, damage to any property, which

a failure or malfunction of our Products may cause. The following are examples of safety measures:

[a] Installation of protection circuits or other protective devices to improve system safety

[b] Installation of redundant circuits to reduce the impact of single or multiple circuit failure

3. Our Products are designed and manufactured for use under standard conditions and not under any special or

extraordinary environments or conditions, as exemplified below. Accordingly, ROHM shall not be in any way

responsible or liable for any damages, expenses or losses arising from the use of any ROHM’s Products under any

special or extraordinary environments or conditions. If you intend to use our Products under any special or

extraordinary environments or conditions (as exemplified below), your independent verification and confirmation of

product performance, reliability, etc, prior to use, must be necessary:

[a] Use of our Products in any types of liquid, including water, oils, chemicals, and organic solvents

[b] Use of our Products outdoors or in places where the Products are exposed to direct sunlight or dust

[c] Use of our Products in places where the Products are exposed to sea wind or corrosive gases, including Cl2,

H2S, NH3, SO2, and NO2

[d] Use of our Products in places where the Products are exposed to static electricity or electromagnetic waves

[e] Use of our Products in proximity to heat-producing components, plastic cords, or other flammable items

[f] Sealing or coating our Products with resin or other coating materials

[g] Use of our Products without cleaning residue of flux (even if you use no-clean type fluxes, cleaning residue of

flux is recommended); or Washing our Products by using water or water-soluble cleaning agents for cleaning

residue after soldering

[h] Use of the Products in places subject to dew condensation

4. The Products are not subject to radiation-proof design.

5. Please verify and confirm characteristics of the final or mounted products in using the Products.

6. In particular, if a transient load (a large amount of load applied in a short period of time, such as pulse. is applied,

confirmation of performance characteristics after on-board mounting is strongly recommended. Avoid applying power

exceeding normal rated power; exceeding the power rating under steady-state loading condition may negatively affect

product performance and reliability.

7. De-rate Power Dissipation (Pd) depending on Ambient temperature (Ta). When used in sealed area, confirm the actual

ambient temperature.

8. Confirm that operation temperature is within the specified range described in the product specification.

9. ROHM shall not be in any way responsible or liable for failure induced under deviant condition from what is defined in

this document.

Precaution for Mounting / Circuit board design

1. When a highly active halogenous (chlorine, bromine, etc.) flux is used, the residue of flux may negatively affect product

performance and reliability.

2. In principle, the reflow soldering method must be used; if flow soldering method is preferred, please consult with the

ROHM representative in advance.

For details, please refer to ROHM Mounting specification

Datasheet

Notice - GE Rev.002

Precautions Regarding Application Examples and External Circuits

1. If change is made to the constant of an external circuit, please allow a sufficient margin considering variations of the

characteristics of the Products and external components, including transient characteristics, as well as static

characteristics.

2. You agree that application notes, reference designs, and associated data and information contained in this document

are presented only as guidance for Products use. Therefore, in case you use such information, you are solely

responsible for it and you must exercise your own independent verification and judgment in the use of such information

contained in this document. ROHM shall not be in any way responsible or liable for any damages, expenses or losses

incurred by you or third parties arising from the use of such information.

Precaution for Electrostatic

This Product is electrostatic sensitive product, which may be damaged due to electrostatic discharge. Please take proper

caution in your manufacturing process and storage so that voltage exceeding the Products maximum rating will not be

applied to Products. Please take special care under dry condition (e.g. Grounding of human body / equipment / solder iron,

isolation from charged objects, setting of Ionizer, friction prevention and temperature / humidity control).

Precaution for Storage / Transportation

1. Product performance and soldered connections may deteriorate if the Products are stored in the places where:

[a] the Products are exposed to sea winds or corrosive gases, including Cl2, H2S, NH3, SO2, and NO2

[b] the temperature or humidity exceeds those recommended by ROHM

[c] the Products are exposed to direct sunshine or condensation

[d] the Products are exposed to high Electrostatic

2. Even under ROHM recommended storage condition, solderability of products out of recommended storage time period

may be degraded. It is strongly recommended to confirm solderability before using Products of which storage time is

exceeding the recommended storage time period.

3. Store / transport cartons in the correct direction, which is indicated on a carton with a symbol. Otherwise bent leads

may occur due to excessive stress applied when dropping of a carton.

4. Use Products within the specified time after opening a humidity barrier bag. Baking is required before using Products of

which storage time is exceeding the recommended storage time period.

Precaution for Product Label

QR code printed on ROHM Products label is for ROHM’s internal use only.

Precaution for Disposition

When disposing Products please dispose them properly using an authorized industry waste company.

Precaution for Foreign Exchange and Foreign Trade act

Since our Products might fall under controlled goods prescribed by the applicable foreign exchange and foreign trade act,

please consult with ROHM representative in case of export.

Precaution Regarding Intellectual Property Rights

1. All information and data including but not limited to application example contained in this document is for reference

only. ROHM does not warrant that foregoing information or data will not infringe any intellectual property rights or any

other rights of any third party regarding such information or data. ROHM shall not be in any way responsible or liable

for infringement of any intellectual property rights or other damages arising from use of such information or data.:

2. No license, expressly or implied, is granted hereby under any intellectual property rights or other rights of ROHM or any

third parties with respect to the information contained in this document.

Other Precaution

1. This document may not be reprinted or reproduced, in whole or in part, without prior written consent of ROHM.

2. The Products may not be disassembled, converted, modified, reproduced or otherwise changed without prior written

consent of ROHM.

3. In no event shall you use in any way whatsoever the Products and the related technical information contained in the

Products or this document for any military purposes, including but not limited to, the development of mass-destruction

weapons.

4. The proper names of companies or products described in this document are trademarks or registered trademarks of

ROHM, its affiliated companies or third parties.

DatasheetDatasheet

Notice – WE Rev.001

General Precaution

1. Before you use our Pro ducts, you are requested to care fully read this document and fully understand its contents.

ROHM shall n ot be in an y way responsible or liabl e for fa ilure, malfunction or acci dent arising from the use of a ny

ROHM’s Products against warning, caution or note contained in this document.

2. All information contained in this docume nt is current as of the issuing date and subj ect to change without any prior

notice. Before purchasing or using ROHM’s Products, please confirm the la test information with a ROHM sale s

representative.

3. The information contained in this doc ument is provi ded on an “as is” basis and ROHM does not warrant that all

information contained in this document is accurate an d/or error-free. ROHM shall not be in an y way responsible or

liable for an y damages, expenses or losses incurred b y you or third parties resulting from inaccur acy or errors of or

concerning such information.

Datasheet

Part Number bu21079f

Package SOP16

Unit Quantity 2500

Minimum Package Quantity 2500

Packing Type Taping

Constitution Materials List inquiry

RoHS Yes

bu21079f - Web Page

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