AS3682
480mA Camera Lighting Management Unit
www.austriamicrosystems.com Revision 2.21 1 - 43
austria
micro
systems
Data Sheet
1 General Description
The AS3682 is a low-noise, high-current ch arge pump
designed for camera flash LEDs and LCD backlighting
applications. The device is capable of driving up to
480mA of load current.
The AS3682 integrates two independent LED blocks for
driving a single flash LED (CURR11 to CURR13) with up
to 480mA, and general purpose LEDs (CURR2 to
CURR4) with up to 160mA/LED. The general purpose
LEDs are controlled individually and can be used for
backlighting, but also in support of an RGB fun-light or a
movie indicator lamp.
The AS3682 utilizes austriamicrosystems' patent-pend-
ing Intelligent Adaptive Mode Setting (IAMS) to switch
between 1:1, 1:1.5, and 1: 2 modes. In combination with
very-low-drop-out current sinks, the device achieves
high efficiency over the full single-cell Li+ battery voltage
range. The charge pump opera tes at a fixed frequency
of 1MHz allowing for tiny external components and its
design ensures low EMI and low input-ripple.
The ultra-flexible brightness control scheme allows for
simple adaptation of the device to different system archi-
tectures.
In Normal and Soft Flash Modes the device is controlled
by an I2C interface. In these modes the LED brightness,
flash duration, GPIOs and various charge pump states
are controlled by internal register settings. The GPIO
pins can act as programmable input or output pins and
can also be set to trigger preview and flash light directly
by a camera module.
In Hard Flash Mode, the LED brightness is controlled by
the Enable pins. Those programming pins can be used
as simple enable pins, as PWM input, again offering
ample flexibility for setting the LED brightness.
2 Key Features
!High-Efficiency High-Power Charge Pump
- 1:1, 1:1.5, and 1:2 Intelligent Adaptive Mode Set-
ting (IAMS)
- Efficiency up to 95%
- Soft Start to Reduce Inrush Current
- Low-Noise Constant-Frequency Operation
!Current Sinks
- 400mA Continuous Flash Current (@VIN = 3.2 to
5V, VOUT = 5V)
- 480mA Maximum Pulsed Flash Current
- Programmable: 0 to 160mA, 0.625mA Resolution
!Flexible Brightness Control
- Three 0 to 160mA LEDs
- Individually Addressable via I 2C Interface
!Three Operating Mode s
- Normal Mode (I2C Interface)
- Soft Flash Mode (I2C Interface)
- Dedicated Control Pins for Hard Flash Modes
!Two General Purpose Inputs/Outputs
- Digital Input, Output, and Tristate
- Programmable Pull-Up and Pull-Down
- Strobe Pin can be used for Camera Flash Control
!LED Disconnect in Shutdown
!Open LED Detection
!Low Stand-By Current (6µA), Interface Fully
Operating
!Low Shut-Down Current (0.2µA)
!Wide Battery Supply Range: 3.0 to 5.5V
!Thermal Protection
!24-Pin, Small Form-Factor QFN Package
- 4 x 4 x 0.85mm, 0.5mm Pitch
- Enhanced Thermal Characteristics
3 Applications
Lighting management for cameras, mobile telephones,
PDAs, and other 1-cell Li+ or 3-cell NiMH powered
devices.
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Data Sheet
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4 Block Diagram
Figure 1. AS3682 Block Diagram
5 Application Diagrams
Figure 2. Normal and Soft Flash Mode Application Diagram
3 C1_P
RBIAS 23
CLK/P2 8
STROBE/F2 11
GPIO0/P0 10
SFL/F1 16
T1/F0 17
DATA/P1 9
VDD_GPIO 12
ADR 1
GND
Exposed Pad
2 VBAT1
6 VBAT2
5 C2_P
7 C2_N
24 C1_N
4 CP_OUT
13 CURR11
14 CURR12
15 CURR13
Digital
Supply
Bandgap
and
Current
Reference
Digital
Part
Serial
Interface
V2_5 22
Charge Pump
1:1, 1:1.5, 1:2
AS3682
Current Source
19 CURR2
20 CURR3
21 CURR4
Current Source
Mode
Selector
HFL 18
SFL Mode:
SFL/F1 = VDD_GPIO
Normal Mode:
SFL/F1 = GND
AS3682 Camera
Flash
LED
C3
1µF
ADR 1
RBIAS 23
CLK/P2 8
STROBE/F2 11
GPIO0/P0 10
SFL/F1 16
T1/F0 17
HFL 18
DATA/P1 9
2 VBAT1
6 VBAT2
5 C2_P
7 C2_N
24 C1_N
4 CP_OUT
13 CURR11
VDD_GPIO 12
R1
240kΩ
R4
1 - 10kΩ
14 CURR12
15 CURR13
19 CURR2
20 CURR3
21 CURR4
C6
2.2µF
Flash &
Preview
Battery or
CP_OUT
V2_5 22 Feature Normal
Mode Soft Flash
Mode
Interface I2CI
2C
Flash LEDs
Current
Sinks 33
Total Current 0 to 450mA 0 to 480mA
Addressable Block Block
Strobe
Trigger STROBE/F2
or software STROBE/F2
or software
Strobe
Preview GPIO0/P0
or software GPIO0/P0
or software
General Purpose
LEDs (CURR2,
CURR3, CURR4)
Current
Sinks 33
Current per
Sink 0 to 37.5mA 0 to 160mA
Addressable Individual Individual
C4
1µF
C1
2.2µF
C5
1µF
V2.5 = 41h
GND = 40h3 C1_P
Battery
GND
Exposed Pad
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Data Sheet
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Figure 3. Hard Flash Mode 1 Application Diagram
Figure 4. Hard Flash Mode 2 Application Diagram
3 C1_P
Feature Hard Flash Mode 1
Interface Dedicated Control Pins
for Strobe (3x) &
Preview (3x)
Flash LEDs
Current Sinks 6
Total Current Strobe: 0 to 450mA
Preview: 0 to 400mA
Addressable Block
Strobe Trigger By Strobe Control Pins
Strobe Preview By Preview Control
Pins
General Purpose
LEDs (CURR2,
CURR3, CURR4)
Current Sinks N/A
Current per
Sink N/A
Addressable N/A
Preview Control
(Active Low)
C3
1µF
ADR 1
V2_5 22
RBIAS 23
CLK/P2 8
GPIO0/P0 10
STROBE/F2 11
SFL/F1 16
T1/F0 17
HFL 18
DATA/P1 9
VDD_GPIO 12
Selectable
R1
240kΩ
Battery
Strobe Control
(Active Low) LSB Flash
MSB Flash
LSB Preview
MSB Preview AS3682 Camera
Flash
LED
2 VBAT1
6 VBAT2
4 CP_OUT
13 CURR11
14 CURR12
15 CURR13
19 CURR2
20 CURR3
21 CURR4
C6
2.2µF
Flash &
Preview
5 C2_P
7 C2_N
24 C1_N
C4
1µF
C1
2.2µF
C5
1µF
Battery
GND
Exposed Pad
3 C1_P
Feature Hard Flash Mode 2
Interface Dedicated Control Pins
for Flash (3x) & General
Purpose (3x)
Flash LEDs
Current Sinks 3
Total Current Flash: 0 to 450mA
Addressable Block
Strobe Trigger By Flash Control Pin
Strobe Preview
General Purpose
LEDs (CURR2,
CURR3, CURR4)
Current Sinks 3
Current per Sink 0 to 20/37.5mA
Addressable Block
Backlight Control
(Active Low)
C3
1µF
ADR 1
V2_5 22
RBIAS 23
CLK/P2 8
GPIO0/P0 10
STROBE/F2 11
SFL/F1 16
T1/F0 17
DATA/P1 9
VDD_GPIO 12
Selectable
R1
240kΩ
Flash Control
(Active Low) LSB Flash
MSB Flash
LSB Preview
MSB Preview AS3682
Camera
Flash
LED
2 VBAT1
6 VBAT2
4 CP_OUT
13 CURR11
14 CURR12
15 CURR13
C6
2.2µF
Flash &
Preview
5 C2_P
7 C2_N
24 C1_N
C4
1µF
C1
2.2µF
C5
1µF
19 CURR2
20 CURR3
21 CURR4
Battery
HFL 18
Battery
GND
Exposed Pad
AS3682 austria
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Data Sheet
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Revision History
Revision Date Owner Description
2.1 10 February 2005 ptr - Various minor updates implemented.
2.2 16 August 2005 ptr - Updated exposed pad size (D2 x E2).
- Updated parameter VIH max value.
- Updated parameter VIL max value.
- Added parameter VPOR_VBAT min and max values.
- Added bit Curr234_gpio0_ctrl (page 29).
- Added bit Curr234_strobe_ctrl (page 29).
- Added Fixed ID Register (Addr: 15).
2.21 6 July 2006 ptr - Updated gpio0_pulls bit settings.
- Updated strobe_pulls bit settings.
- Updated data sheet status to public viewable.
AS3682 austria
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Data Sheet
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Table of Contents
1 General Description ................................................................................................................................ 1
2 Key Features .......................................................................................................................................... 1
3 Applications ............................................................................................................................................ 1
4 Block Diagram ........................................................................................................................................ 2
5 Application Diagrams .............................................................................................................................. 2
6 Characteristics ........................................................................................................................................ 6
6.1 Absolute Maximum Ratings (Non-Operating) .................................................................................................. 6
6.2 Operating Conditions ....................................................................................................................................... 6
6.3 Electrical Characteristics ................................................................................................................................. 7
7 Typical Operation Characteristics ........................................................................................................... 9
8 Detailed Functional Descriptions ........................................................................................................ .. 11
8.1 Charge Pump ................................................................................................................................................ 11
8.1.1 Intelligent Adaptive Mode Switching (IAMS) ....................................................................................... 11
8.1.2 Soft Start ............................................................................................................................................. 11
8.1.3 Open LED Detection ........................................................................................................................... 11
9 Mode Settings ....................................................................................................................................... 12
10 Hard Flash Modes .............................................................................................................................. 14
10.1 Hard Flash Mode 1 ................. ... ................ ... ... ................. ... ................ ... ... ................. ................................. 15
10.2 Hard Flash Mode 2 ................. ... ................ ... ... ................. ... ................ ... ... ................. ................................. 17
11 Normal and Soft Flash Modes ............................................................................................................ 19
11.1 Current Settings in Normal Mode ................................................................................................................ 20
11.2 Current Settings in Soft Flash Mode ............................................................................................................ 23
11.3 T iming Control of CURR11, CURR12, CURR13 in Normal Mode and Soft Flash Mode ................................ 24
11.4 Control of CURR2, CURR3, CURR4 in Normal Mode and Soft Flas h Mode ............ ... ................. ... ............. 29
11.5 Charge Pump Control Registers ..................... ... ................. .. ... ................. ... ................. .. ... ......................... 30
11.6 General Purpose Inputs/Outputs .................. ................. ... ... ................ ... ................. ... ... ....... ....................... 31
11.7 Power-On Reset .......................................................................................................................................... 32
11.8 Temperature Supervision ............. ... ... ................. ... ................ ... ... ................. ... ............................................ 32
11.9 Serial Interface ............... ... ... ................. ... .. ................. ... ................. ... .. ................. ....................................... 33
11.9.1 Features ................. ... .............. ... ............................ ... .............. .. .......................... .............................. 33
11.9.2 Device Address Selection ................................................................................................................. 33
11.9.3 Data Transfer Formats ...................................................................................................................... 33
11.9.4 Fixed ID Register .............................................................................................................................. 35
11.10 Register Map .................. ... ................. ... ................ ... ................. ... ... ................ ... ....................................... 36
12 External Components ......................................................................................................................... 37
12.1 Capacitor and Resistor Selection ................................................................................................................ 37
12.2 Usage of PCB Wire Inductance ................................................................................................................... 37
12.3 External Component Specifications ............................................................................................................. 37
13 Pinout and Packaging ... ................ ... ... .... ... ... ... ... ................. ... ... ... .... ... ... ............................................ 38
13.1 Hard Flash Modes Pin Descriptions .............................................................................................................. 38
13.2 Normal Mode and Soft Flash Mode Pin Descriptions .................................................................................. 39
13.3 Package Drawings and Markings ................................................................................................................ 40
14 Ordering Information ........................................................................................................................... 42
AS3682 austria
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Data Sheet Absolute Maximum Ratings (Non-Operating)
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6 Characteristics
6.1 Absolute Maximum Ratings (Non-Operating)
Stresses beyond those li sted in Tab l e 1 ma y cau s e pe rmanent damage to the device. These are stress ratings only,
and functional operation of the device beyond thos e indicated in Table 2 is not implied.
Caution: Exposure to absolute maximum rating conditions may affect device reliability.
Notes:
1. 5V pins are VBAT1, VBAT2, HFL, current sink pi ns (CURR11, CURR12, CURR13, CURR2, CURR3, and CURR4)
and the charge pump pins (C1_N, C2_N, C1_P, C2_P, and CP_OUT).
2. 3.3V pins are GPIO0/P0, STROBE/F2, interface pins (CLK/P2, DATA/P1, ADR) and all other pins.
6.2 Operating Conditions
Table 1. Absolute Maximum Ratings
Symbol Parameter Min Max Unit Notes
VIN_MV 5V Pins -0.3 7.0 V Applicable for 5V pins1
VIN_LV 3.3V Pins -0.3 5.0,
VDD_GPIO + 0.3 VApplicable for 3.3V pins2
IIN Input Pin Current -25 +25 mA At 25ºC, Norm: Jedec 17
TSTRG Storage Temperature Range -55 125 ºC
Humidity 5 85 % Non condensing
VESD Electrostatic Discharge -1000 1000 V Norm: MIL 883 E Method 3015
PT Total Power Dissipation 1 W TAMB = 70º
TBODY Body Temperature 260 º IPC/JEDEC J-STD-020C
Table 2. Operating Conditions
Symbol Parameter Min Typ Max Unit Notes
VBAT Battery V oltage 3.0 3.6 5.5 V VBAT1 and VBAT2
VDD_GPIO Periphery Supply Voltage 1.5 3.3 V
V2_5 Voltage on Pin V2_5 2.4 2.5 2.6 V Internally generate d; Hard Flash Mode:
always on; Soft Flash Mode: always on
except in shutdown.
TAMB Ambient Temperature -30 25 85 ºC
IBAT Operating Current 1 A Depending on load current and charge
pump mode.
ISTANDBY
Standby Mode Current 6 10.5 µA
Current consumption in standby mode;
Only 2.5V regulator on; temperature
supervision off.
VDD_GPIO (page 8) > VGPIO_Vdd_TH_RISING
(page 8).
Standby Mode Current
including Temperature
Supervision 814.5µA
Current consumption in standby mode;
Only 2.5V regulator on and temperature
supervision on .
VDD_GPIO > VGPIO_Vdd_TH_RISING.
This is also the minimum current
consumption in Hard Flash Mode.
ISHUTDOWN Shutdown Mode Current 0.2 1.5 µA Current consumption in shutdown mode;
VDD_GPIO < 0.3v.
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Data Sheet Electrical Characteristics
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6.3 Electrical Characteristics
Notes:
1. This parameter describes the efficiency of the charge pump only.
Table 3. Charge Pump Electrical Cha ra c teristics
Symbol Parameter Min Typ Max Unit Notes
VCPOUT
Output Voltage
Without Load VBAT x
CP-mode VInternally regulated.
Output Limitation 5.3 5.6 V
Output Voltage
With Load (I = 400mA)
3.32 1:1 Mode; V BAT = 3.5V
4.31 1:1.5 Mode; VBAT = 3.5V
5.24 1:2 Mode; V BAT = 3.5V
RCP Charge Pump
Effective Resistance
0.5
Ω
1:1 Mode; V BAT = 3.0V, ILOAD = 400mA
2.6 1:1.5 Mode; VBAT = 3.0V, ILOAD = 400mA
2.5 1:2 Mode; V BAT = 3.0V, ILOAD = 400mA
ICPOUT Continuous Output Current 400 mA In automa tic mode only; VBAT ≤ 4.2V.
ICP Power Consumption
Without Load,
FCLK = 1 MHz
0.1 mA 1:1 mode
4.5 1:1.5 mode
51:2 mode
Eta_1 Efficiency1175 93 % VIN = 3.0 to 4.5V, IOUT = 100mA
Eta_2 Efficiency2165 82 % VIN = 3.0 to 4.5V, IOUT = 10 to 350mA
tRRising T ime 1.0 ms
VORIP Output Ripple 10 mVpp VIN = 3.0 to 4.5V,
IOUT = 350mA, CP = 2.2uF, X5R
fCLK Clock Frequency -20% 1.0 20% MHz
Table 4. Current Sink Electrical Characteristics
Symbol Parameter Min Typ Max Unit Notes
ICURR1x-MAX CURR1x Maximum
Output Current
150 mA Normal Mode
160 Soft Flash Mode
150 Hard Flash Mo de
ICURR1x-RES CURR1x Resolution
15
mA
Normal Mode low range (I < 240mA)
30 Normal Mode high range (I > 240mA)
0.625 Soft Flash Mode
20 Hard Flash Mo de
ICURR2,3,4-MAX CURR2,3,4 Maximum
Output Current
37.5 mA Normal Mode
160 Soft Flash Mode
150 Hard Flash Mo de
ICURR2,3,4-RES CURR2,3,4 Resolution 2.5 mA Normal Mode
0.625 Soft Flash Mode
20 Hard Flash Mo de
Delta-abs Absolute Accuracy -20 +20 % All current sinks
Delta-rel Relative Accuracy 5 %
VPROTECT Voltage Above VBAT for
Protection VBAT + 2.0 V ISINK >= 20mA
VCOMPL Voltage Compliance 0.2 VBAT + 0.5 V During normal operation
V_LOW Under-Voltage Detection 50 150 200 mV
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Data Sheet Electrical Characteristics
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Table 5. GPIO0/P0 and STROBE/F2 Electrical Characteristics
Symbol Parameter Min Max Unit Notes
VDD_GPIO Supply Voltage 1.5 3.3 V
VIH High Level Input Voltage 0.7 x VDD_GPIO VDD_GPIO VVDD_GPIO > 1.85V
1.3V VDD_GPIO < 1.85V
VIL Low Level Input Voltage 0.0 0.3 x VDD_GPIO V
VHYS Hysteresis 0.1 x VDD_GPIO 0.4 V
ILEAK Input Leakage Current (if
not configured as
Pullup/Pulldown) -5 5 µA To VDD_GPIO and VSS.
IPD Pulldown Current
(if configured as Pulldown) 50 150 µA To VSS.
IPU Pullup Current
(if configured as Pullup and
in Hard Flash Modes) 20 347 µA To VDD_GPIO (1.5 to 3.3V)
VOH High Level Output Voltage 0.8 x VDD_GPIO V
VOL Low Level Output Voltage 0.2 x VDD_GPIO V
IOUT Driving Capability 4 mA VDD_GPIO = 2.8V
CLOAD Capacitive Load 50 pF
Table 6. CLK/P2, DATA/P1, SFL/F1, and T1/F0 Electrical Charac teristics
Symbol Parameter Min Max Unit Notes
VDD_GPIO Supply Voltage 1.5 3.3 V
VIH High Level Input Voltage 0.7 x VDD_GPIO VDD_GPIO VVDD_GPIO > 1.85V
1.3V VDD_GPIO < 1.85V
VIL Low Level Input Voltage 0.0 0.3 x VDD_GPIO V
VHYS Hysteresis 0.07 x VDD_GPIO 0.5 V
ILEAK Input Leakage Current (in
Soft Flash and Normal
Modes) -5 5 µA To VDD_GPIO and VSS.
IPU Pullup Resistor (in Hard
Flash Modes) 50k 200k ΩTo VDD_GPIO.
Table 7. Power-On Reset Electrical Characteristics
Symbol Parameter Min Typ Max Unit Notes
VPOR_VBAT Overall Power-On Reset 1.5 2.0 2.38 V Monitors voltage on pin V2_5;
power-on reset for all inte rnal
functions.
VVDD_GPIO_TH_
RISING Reset Level for
VDD_GPIO Rising 1.3 V Monitors voltage on VDD_GPIO; rising
level.
VVDD_GPIO_TH_
FALLING Reset Level for
VDD_GPIO Falling 1.0 V Monitors voltage on VDD_GPIO;
falling level.
Table 8. Over-Temperature Detection Electrical Characteristics
Symbol Parameter Min Typ Max Unit Notes
T140 ov_tem p Ri si n g Th re sh ol d 130 140 150 ºC
THYST ov_temp Hysteresis 5 ºC
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Data Sheet
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7 Typical Operation Characteristics
Figure 5. Efficiency vs. VBAT (with 1 Flash LED, Type LumiLed PWF-1)
Figure 6. Battery Current vs. VBAT (with 1 Flash LED, Type LumiLed PWF-1)
Figure 7. Efficiency vs. VBAT (with 1 Flash LED, Type Osram LWW5SG LED)
50
60
70
80
90
100
3.2 3.4 3.6 3.8 4 4.2
VBAT[V]
Efficiency Pled/Pbat
113mA Total
195mA Total
330mA Total
450mA Total
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
3 3.2 3.4 3.6 3.8 4 4.2
VBAT[V]
IBAT[A]
450m A Tot al
330mA Total
195mA Total
112.5m A Total
50
60
70
80
90
3.2 3.4 3.6 3.8 4 4.2
V BAT [V]
Efficiency Pled/Pbat
150mA Total 210mA Total 300mA Total 452mA Total
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Data Sheet
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Figure 8. Battery Current vs. VBAT (with 1 Flash LED, Type Osram LWW5SG LED)
Figure 9. Linearity of 1 Current Sink with 10mA and 100mA Load
0
100
200
300
400
500
600
700
800
900
1000
3 3.2 3.4 3.6 3.8 4 4.2
VBAT[V]
IBAT [mA]
452m A Total
300m A Total
210mA Total
105mA Total
0
20
40
60
80
100
120
0 200 400 600 800
Vcurrentsink[mV]
Icurrentsink [mA]
10mA
100mA
AS3682 austria
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Data Sheet Charge Pump
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8 Detailed Functional Descriptions
8.1 Charge Pump
The AS3682 charge pump uses two external flying capacitors to generate output voltages higher than the battery volt-
age.
The charge pump can operate in three different modes:
!1:1 Bypass Mode
- Battery input and output are connected by a low-impeda nce switch
- Battery current = output current
!1:1.5 Mode
- The output voltage is 1.5 times the battery voltage (without load)
- Battery current = 1.5 times output current
!1:2 Mode
- The output voltage is 2 times the battery voltage (without load)
- Battery current = 2 times output current
8.1.1 Intelligent Adaptive Mode Switching (IAMS)
The integrated charge pump determines the best compromise between the required LED supply voltage (Vf) and the
lowest internal power dissipation. The AS3682 examines the voltage at each current sink and automatically switches
into a higher charge pump mode; the switch-down procedure is achieved after the AS3682 performs analog signal pro-
cessing of all relevant param eters: the battery voltage, the actual charge pump voltage, the load current, and the resis-
tance of the next charge pump mode. By predicting the efficiency of the next state, the AS3682 will accurately
determine the switching point.
8.1.2 Soft Start
An implemented soft start mechanism reduces the inrush current. Battery current is smoothed when switching the
charge pump on and also at each switching condition. This precaution reduces electromagnetic radiation significantly.
8.1.3 Open LED Detection
The voltages at the current sinks are used to determine the mode switching of the charge pump up, thus an open wire
to the LED could lead to a to high-power dissipation of the circuit.
The AS3682 scans and compares all voltages on the current sinks continuously, so that if the charge pump is already
at 1:2 mode and the required current cannot be provided, the circuit stops that current sink sensing until the next
power-on condition. Using the circuit via the I2C interface (Normal Mode and Soft Flash Mode) the system can get
information on th e failing path from the GPIO_output (page 31) register.
Scanning occurs automatically upon first entering 1:2 mode.
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Data Sheet
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9 Mode Settings
The AS3682 can operate in four different application modes which can be easily selected either by external pins or will
be factory preset.
!Normal Mode – The AS3682 is fully programmable via an I2C interface allowing for access to all control registers.
The maximum total Flash Current of 450mA can be set in 15 or 30mA steps. Preview and strobe timing can be con-
trolled either by internal registers or by dedicated pins (STROBE/F2, GPIO0/P0) connected to the BB or a camera
module. The 3 Flash LED current sinks can only be addressed as a single block.
The three General Purpose LED current sinks can be addressed individually allowing for the realization of Back-
lighting, Movie Indicator LEDs or an RGB Fun Light or can be connected to the Flash LED. The ma ximum current
per sink is 37.5mA whereas the current can be set in 2.5mA steps per channel.
!Soft Flash Mode – The AS3682 is fully programmable via an I2C interface allowing for access to all control regis-
ters. The maximum total Flash Current of 480mA can be set in 1.875mA steps. Preview and strobe timing can be
controlled either by internal registers or by dedicated pins (STROBE/F2, GPIO0/P0) connected to the BB or a Cam-
era Module. The 3 Flash LED current sinks can only be addressed as a single block.
The three General Purpose LED current sinks can be addressed individually allowing for the realization of Back-
lighting, Movie Indicator LEDs or an RGB Fun Light or can be connected to the Flash LED. The ma ximum current
per sink is 160mA whereas the current can be set in 2.5mA steps per channel.
!Hard Flash Mode 1 – All AS3682 functions are controlled by dedicated Enable Pins. Seven different current levels
can be set independently for Preview and Flash by the Preview pins (GPIO0/P0, DATA/P1, CLK/P2) and the Flash
pins (T1/F0, SFL/F1, STROBE/F2). The maximum total current is 450mA for strobe and 240mA for preview when
connecting 3 current sinks to the LED. Since Hard Flash Mode 1 addresses all 6 current sinks, higher preview and
strobe currents can be programmed, however the total absolute maximum current must not exceed 480mA.
!Hard Flash Mode 2 – All AS3682 functions are controlled by dedicated Enable Pins. The three Flash Current sinks
(Curr11, Curr12, Curr13) act as a single block being controlled by the Flash control pins (T1/F0, SFL/F1, STROBE/
F2). The maximum total Flash current of 450mA can be adjusted in 60mA steps.
The three General Purpose LED current sinks (Curr11, Curr12, Curr13)) can be addressed inde pendently from the
Flash LEDs by dedicated pins (GPIO0/P0, DATA/P1, CLK/P2). The current per-sink can be adjusted in 6 levels up
to 20mA per channel with a resolution of 2.5mA. A seventh level allows for a maxim of 37.5mA which can be used
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Data Sheet
www.austriamicrosystems.com Revision 2.21 13 - 43
to address e.g., six white LEDs. After presetting the current with the dedicated pins the actual brightness can also
be adjusted by PWM applied to the related pins.
Note: The Hard Flash Modes are factory preset. Refer to Ordering Information on page 42.
Note: The AS3682 has been designed and qualified for the following operating conditions:
- Continuous output current of 400mA if operated in automatic switch mode at VBAT = 3.2 to 4.2V.
- Maximum Pulsed Output current: 480mA.
Table 9. AS3682 Function Settings
Feature Normal Mode Soft Flash
Mode Hard Flash Mode 1 Hard Flash Mode 2
Interface I2CI
2CDedicated Control
Pins for Strobe (3x)
and Preview (3x)
Dedicated Control Pins
for Flash (3x) and
General Purpose (3x)
Flash LEDs
Current Sinks 3 3 6 3
Total Current 0 to 450mA 0 to 480mA Strobe:
0 to 450mA
Preview:
0 to 400mA
Flash:
0 to 450mA
Addressable Block Block Block Block
Strobe Trigger STROBE/F2
or software STROBE/F2
or software By St robe
Control Pins By Flash Control Pin
Stro be Preview GPIO0/P0
or software GPIO0/P0
or software By Preview
Control Pins
General Purpose
LEDs (CURR2,
CURR3, CURR4)
Current Sinks 3 3 N/A 3
Current per Sink 0 to 37.5mA 0 to 160mA N/A 0 to 20/37.5mA
Addressable Individual Individual N/A Block
AS3682 austria
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Data Sheet Charge Pump
www.austriamicrosystems.com Revision 2.21 14 - 43
10 Hard Flash Modes
The Hard Flash Modes allow for simple and efficient control of the AS3682 using dedicated Enable Pins. While the
Hard Flash Mode can be sele cted by defined pin connectio ns (see Table 10 Hard Flash Mode Setting by Pin Con figu-
ration) the distinction between Hard Flash Mode 1 and Hard Flash Mode 2 is set by the factory (refer to Ordering Infor-
mation on page 42 for more information).
An integrated temperature sensor provi des over-temperature protection for the AS3682. If the device temperature
exceeds the value of T140 (page 8), the current sources will be switched off. The device will resume operation when the
temperatu r e drops bel ow T140 - THYST (page 8).
!Hard Flash Mode 1 (page 15) Allows for individual control of Strobe and Pre view Signals or in other words Flash
and Torch engaging all 6 current sinks.
!Hard Flash Mode 2 (page 17) Addresses the Flash LEDs and General Purpose LEDs independently of each other
providing the possibility to realize Flash and Backlight Functions in parallel.
Note: In both Hard Flas h Modes pins STROBE/F2 , SFL/F1, T1/F0, CLK/P2, DAT A/P1, and GPIO0/P0 are Active-Low
(with internal pull-up resistors).
Hard Flash Modes 1 and 2 are factory prese t. See Orde ring Information on page 42.
Table 10. Hard Flash Mode Setting by Pin Configuration
Pin HFL Pin SFL/F1 Mode
GND GND Normal Mode
GND VDD_GPIO Soft Fl a s h Mo de
VBAT Don't Care Hard Flash Mode
AS3682 austria
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Data Sheet Hard Flash Mo de 1
www.austriamicrosystems.com Revision 2.21 15 - 43
10.1 Hard Flash Mode 1
Figure 10. Hard Flash Mode 1 Functional Diagr am
Table 11. Hard Flash Mode 1 Functions
Feature Hard Flash Mode 1 Hard Flash Mode 2
Interface Dedicated Control Pins for St robe
(3x) and Preview (3x) Dedi ca te d Co nt ro l Pi ns fo r Fl ash
(3x) and General Purpose (3x)
Flash LEDs
Current Sinks 6 3
Total Current Stro be: 0 to 450mA
Preview: 0 to 400mA Flash: 0 to 450mA
Total Current Reso l ut i on Strobe: 60mA
Preview: 30mA Flash: 60mA
Addressable Block Block
Strobe Trigger By Strobe Control Pins By Flash Control Pin
Strobe Preview By Preview Control Pins
General Purpose
LEDs (CURR2,
CURR3, CURR4)
Current Sinks N/A 3
Current per Sink N/A 0 to 20/37.5mA
Addressable N/A Block
3 C1_P
Preview Control
(Active Low)
C3
1µF
ADR 1
V2_5 22
RBIAS 23
CLK/P2 8
GPIO0/P0 10
STROBE/F2 11
SFL/F1 16
T1/F0 17
HFL 18
DATA/P1 9
VDD_GPIO 12
Selectable
R1
240kΩ
Battery
Strobe Control
(Active Low) LSB Flash
MSB Flash
LSB Preview
MSB Preview AS3682 Camera
Flash
LED
2 VBAT1
6 VBAT2
4 CP_OUT
13 CURR11
14 CURR12
15 CURR13
19 CURR2
20 CURR3
21 CURR4
C6
2.2µF
Flash &
Preview
5 C2_P
7 C2_N
24 C1_N
C4
1µF
C1
2.2µF
C5
1µF
Battery
GND
Exposed Pad
AS3682 austria
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Data Sheet Hard Flash Mo de 1
www.austriamicrosystems.com Revision 2.21 16 - 43
Figure 11 . Hard Flash Mode 1 Timing Diagram
Notes:
1. Do not exceed maximum current of 480mA.
Note: Do not exceed maximum current of 400mA in Preview Mode (continuous operation).
The AS3682 allows for the parallel connection of up to six curren t sinks to obtain the desired current range in Hard
Flash Mode (unused current sinks can be left open). For example, to obtain 280mA for Preview current, connect
CURR11, CURR12, CURR13, and CURR2 togeth er and set CLK/P2 and DATA/P1 = 0 and GPIO0/P0 = 1.
Table 12. Hard Flash Mode 1 Strobe Current
STROBE/
F2 Bit 2 SFL/F1
Bit 1 T1/F0
Bit 0 Current/
Current
Sink
Cumulative Active Current Sink1
CURR11 CURR12 CURR13 CURR2CURR3CURR4
1 1 1 0mA 0mA 0mA 0mA 0mA 0mA 0mA
1 1 0 30mA 30mA 60mA 90mA 120mA 150mA 180mA
1 0 1 50mA 50mA 100mA 150mA 200mA 250mA 300mA
1 0 0 70mA 70mA 140mA 210mA 280mA 350mA 420mA
0 1 1 90mA 90mA 180mA 270mA 360mA 450mA 540mA
0 1 0 110mA 110mA 220mA 330mA 440mA 550mA 660mA
0 0 1 130mA 130mA 260mA 390mA 520mA 650mA 780mA
0 0 0 150mA 150mA 300mA 450mA 600mA 750mA 900mA
Table 13. Hard Flash Mode 1 Preview Current
CLK/P2
Bit 2 DATA/P1
Bit 1 GPIO0/P0
Bit 0 Current/
Current
Sink
Cumulative Active Current Sink
CURR11 CURR12 CURR13 CURR2CURR3CURR4
111
0mA 0mA 0mA 0mA 0mA 0mA 0mA
110
20mA 20mA 40mA 60mA 80mA 100mA 120mA
101
30mA 30mA 60mA 90mA 120mA 150mA 180mA
100
40mA 40mA 80mA 120mA 160mA 200mA 240mA
011
50mA 50mA 100mA 150mA 200mA 250mA 300mA
010
60mA 60mA 120mA 180mA 240mA 300mA 360mA
001
70mA 70mA 140mA 210mA 280mA 350mA 420mA
000
80mA 80mA 160mA 240mA 320mA 400mA 480mA
I
t
Strobe Current. See
Table 12 on page 16
Preview Current. See
Table 13 on page 16
Preview Control. See
Figure 10 on page 15
Strobe Control. See
Figure 10 on page 15
AS3682 austria
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Data Sheet Hard Flash Mo de 2
www.austriamicrosystems.com Revision 2.21 17 - 43
10.2 Hard Flash Mode 2
Figure 12. Hard Flash Mode 2 Functional Diagr am
Table 14. Hard Flash Mode 2 Functions
Feature Hard Flash Mode 1 Hard Flash Mode 2
Interface Dedicated Control Pins for St robe
(3x) and Preview (3x) Dedi ca te d Co nt ro l Pi ns fo r Fl ash
(3x) and General Purpose (3x)
Flash LEDs
Current Sinks 63
Total Current Stro be: 0 to 450mA
Preview: 0 to 400mA Flash: 0 to 450mA
Total Current Reso l ut i on Strobe: 60mA
Preview: 30mA Flash: 60mA
Addressable Block Block
Strobe Trigger By Strobe Control Pins By Flash Control Pin
Strobe Preview By Preview Control Pins
General Purpose
LEDs (CURR2,
CURR3, CURR4)
Current Sinks N/A 3
Current per Sink N/A 0 to 20/37.5mA
Addressable N/A Block
3 C1_P
Backlight Control
(Active Low)
C3
1µF
ADR 1
V2_5 22
RBIAS 23
CLK/P2 8
GPIO0/P0 10
STROBE/F2 11
SFL/F1 16
T1/F0 17
DATA/P1 9
VDD_GPIO 12
Selectable
R1
240kΩ
Flash Control
(Active Low) LSB Flash
MSB Flash
LSB Preview
MSB Preview AS3682
Camera
Flash
LED
2 VBAT1
6 VBAT2
4 CP_OUT
13 CURR11
14 CURR12
15 CURR13
C6
2.2µF
Flash &
Preview
5 C2_P
7 C2_N
24 C1_N
C4
1µF
C1
2.2µF
C5
1µF
19 CURR2
20 CURR3
21 CURR4
Battery
HFL 18
Battery
GND
Exposed Pad
AS3682 austria
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Data Sheet
www.austriamicrosystems.com Revision 2.21 18 - 43
Figure 13. Hard Flash Mode 2 Timing Diagram
The AS3682 allows for the parallel connection of up to three current sinks in Hard Flash Mode to obtain the desired
current range for the strobe current (unused current sinks can be left open).
Table 15. Hard Flash Mode 2 Strobe Current
STROBE/F2
Bit 2 SFL/F1
Bit 1 T1/F0
Bit 0 Current/
Current Sink
Cumulative Active Current Sink
(CURR11, CURR12, CURR13)
11 12 13
1 1 1 0mA 0mA 0mA 0mA
1 1 0 30mA 30mA 60mA 90mA
1 0 1 50mA 50mA 100mA 150mA
1 0 0 70mA 70mA 140mA 210mA
0 1 1 90mA 90mA 180mA 270mA
0 1 0 110mA 110mA 220mA 330mA
0 0 1 130mA 130mA 260mA 390mA
0 0 0 150mA 150mA 300mA 450mA
Table 16. Hard Flash Mode 2 Backlight Current
CLK/P2
Bit 2 DATA/P1
Bit 1 GPIO0/P0
Bit 0 Current/Current Sink
(CURR2, CURR3, CURR4)
111 0mA
110 5mA
101 7mA
100 10mA
011 12mA
010 15mA
001 17mA
000 37mA
I
t
t
Strobe Current. See
Table 15 on page 18
Flash Control. See
Figure 12 on page 17
Backlight Current. See
Table 16 on page 18
Backlight Control. See
Figure 12 on page 17
AS3682 austria
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Data Sheet Hard Flash Mo de 2
www.austriamicrosystems.com Revision 2.21 19 - 43
11 Normal and Soft Flash Modes
Figure 14. Normal Mode and Soft Flash Mode Functional Diagram
Table 17. Normal and Soft Flash Mode Settings
Pin HFL Pin SFL/F1 Mode
GND GND Normal Mode
GND VDD_GPIO Soft Fl a s h Mo de
VBAT Don't Care Hard Flash Mode
Table 18. Normal Mode and Soft Flash Mode Functions
Feature Normal Mode Soft Flash Mode
Interface I2CI
2C
Flash LEDs
Current Sinks 3 3
Total Current 0 to 450mA 0 to 480mA
Total Current Resolution 4-Bit: 15/30mA 8-Bit: 1.875mA
Addressable Block Block
Strobe Trigger Pin STROBE/F2 (active high)
or software Pin STROBE/F2 (active low)
or software
Strobe Preview Pin GPIO0/P0 (active high)
or software Pin GPIO0/P0 (active low)
or software
General Purpose
LEDs (CURR2,
CURR3, CURR4)
Current Sinks 3 3
Current per Sink 0 to 37.5mA 0 to 160mA
Current Resolution per Sink 4-Bit: 2.5mA 8-Bit: 0.625mA
Addressable Individual Individual
SFL Mode:
SFL/F1 = VDD_GPIO
Normal Mode:
SFL/F1 = GND
AS3682 Camera
Flash
LED
C3
1µF
ADR 1
RBIAS 23
CLK/P2 8
STROBE/F2 11
GPIO0/P0 10
SFL/F1 16
T1/F0 17
HFL 18
DATA/P1 9
2 VBAT1
6 VBAT2
5 C2_P
7 C2_N
24 C1_N
4 CP_OUT
13 CURR11
VDD_GPIO 12
R1
240kΩ
R4
1 - 10kΩ
14 CURR12
15 CURR13
19 CURR2
20 CURR3
21 CURR4
C6
2.2µF
Flash &
Preview
Battery or
CP_OUT
V2_5 22
C4
1µF
C1
2.2µF
C5
1µF
V2.5 = 41h
GND = 40h3 C1_P
Battery
GND
Exposed Pad
AS3682 austria
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Data Sheet Current Settings in Normal Mode
www.austriamicrosystems.com Revision 2.21 20 - 43
11.1 Current Settings in Normal Mode
Table 19. Current Sink_1x Preview Current Definition Register
Addr: 01 Current1_preview
This register sets the current values of the current sinks used during preview.
Bit Bit Name Default Access Description
0curr_hp 0R/W
Used with bits current1_preview.
3:1 N/A
7:4 current1_
preview 0R/W
curr_hp = 0 curr_hp = 1
MSB (Bit 7) LSB (Bit 4) mA mA
0000 0 0
0001 15 30
0010 30 60
0011 45 90
0100 60120
0101 75150
0110 90180
0 1 1 1 105 210
1 0 0 0 120 240
1 0 0 1 135 270
1 0 1 0 150 300
1 0 1 1 165 330
1 1 0 0 180 360
1 1 0 1 195 390
1 1 1 0 210 420
1 1 1 1 225 450
Table 20. Current Sink_1x Strobe Current Definition Register
Addr: 02 Current1_strobe
This register sets the current values of the current sinks used during strobe.
Bit Bit Name Default Access Description
0curr_hs 0R/W
Used with bits current1_strobe.
3:1 N/A
7:4 current1_strobe 0R/W
curr_hs = 0 curr_hs = 1
MSB (Bit 7) LSB (Bit 4) mA mA
0000 0 0
0001 15 30
0010 30 60
0011 45 90
0100 60120
0101 75150
0110 90180
0 1 1 1 105 210
1 0 0 0 120 240
1 0 0 1 135 270
1 0 1 0 150 300
1 0 1 1 165 330
1 1 0 0 180 360
1 1 0 1 195 390
1 1 1 0 210 420
1 1 1 1 225 450
AS3682 austria
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Data Sheet Current Settings in Normal Mode
www.austriamicrosystems.com Revision 2.21 21 - 43
Table 21. Current Sink2,3,4 Control Registers
Addr: 06 Current2
This register sets the current values of the CURR2. Any value not equal 0 activates the sink.
Bit Bit Name Default Access Description
3:0 Current2 0hR/W
MSB (Bit 3) LSB (Bit 0) mA
00000.0
00012.5
00105.0
00117.5
010010.0
010112.5
011015.0
011117.5
100020.0
100122.5
101025.0
101127.7
110030.0
110132.5
111035.0
111137.5
7:4 N/A
Addr: 07 Current3
This register sets the current values of CURR3. Any value not equal 0 activates the sink.
Bit Bit Name Default Access Description
3:0 Current3 0hR/W
MSB (Bit 3) LSB (Bit 0) mA
00000.0
00012.5
00105.0
00117.5
010010.0
010112.5
011015.0
011117.5
100020.0
100122.5
101025.0
101127.7
110030.0
110132.5
111035.0
111137.5
7:4 N/A
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Data Sheet Current Settings in Normal Mode
www.austriamicrosystems.com Revision 2.21 22 - 43
Addr: 08 Current4
This register sets the current values of CURR4. Any value not equal 0 activates the sink.
Bit Bit Name Default Access Description
3:0 Current4 0hR/W
MSB (Bit 3) LSB (Bit 0) mA
00000.0
00012.5
00105.0
00117.5
010010.0
010112.5
011015.0
011117.5
100020.0
100122.5
101025.0
101127.7
110030.0
110132.5
111035.0
111137.5
7:4 N/A
AS3682 austria
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Data Sheet Current Settings in Soft Flash Mode
www.austriamicrosystems.com Revision 2.21 23 - 43
11.2 Current Settings in Soft Flash Mode
Caution: The total current of the charge pump (480mA) must not be exceeded.
Table 22. Current Sink_1x Preview Current Definition Register
Addr: 01 Current1_preview
This register sets the current values of the current sinks CURR1x used during preview.
Bit Bit Name Default Access Description
7:0 current1_preview 0 R/W 00h = 0mA
FFh = 160mA per current sink
Table 23. Current Sink_1x Strobe Current Definition Register
Addr: 02 Current1_strobe
This register sets the current values of the current sinks CURR1x used during strobe.
Bit Bit Name Default Access Description
7:0 current1_strobe 0 R/W 00h = 0mA
FFh = 160mA per current sink
Table 24. Current Sink_2 Control Register
Addr: 06 Current2
This register sets the current values of current sink CURR2. Any value ≠ 0 activates the
sink. Exceptions are Curr234_gpio0_ctrl (page 29) and Curr234_strobe_ctrl (page 29).
Bit Bit Name Default Access Description
7:0 current2 0 R/W 00h = 0mA
FFh =160mA
Table 25. Current Sink_3 Control Register
Addr: 07
Current3
This register sets the current values of current sink CURR3. Any value not-equal 0
activates the sink. Exceptions are Curr234_gpio0_ctrl (page 29) and
Curr234_strobe_ctrl (page 29).
Bit Bit Name Default Access Description
7:0 current3 0 R/W 00h = 0mA
FFh = 160mA
Table 26. Current Sink_4 Control Register
Addr: 08
Current4
This register sets the current values of current sink CURR4. Any value not-equal 0
activates the sink. Exceptions are Curr234_gpio0_ctrl (page 29) and
Curr234_strobe_ctrl (page 29).
Bit Bit Name Default Access Description
7:0 current4 0 R/W 00h = 0mA
FFh = 160mA
AS3682 austria
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Data Sheet Timing Con trol of CURR11, CURR12, CURR13 in Normal Mode a nd Soft Flash Mode
www.austriamicrosystems.com Revision 2.21 24 - 43
11.3 Timing Control of CURR11, CURR12, CURR13 in Normal Mode and Soft Flash
Mode
Connecting the Current Sinks
The load of current sinks CURR11, CURR12, and CURR13 must be connected to the charge pump output (CP_OUT).
Setting the Current Values
Current sinks CURR11, CURR12, and CURR13 are all programmed by the same register settings (registers
current1_preview (page 20) and Current1_strobe (page 20)). They should be connected in parallel (pins CURR11,
CURR12, and CURR13 must be connected externally) to increase the driving capability, e.g., for a photo camera flash
LED.
The current defined in these registers (current1_preview and Current1_strobe) is the total current, which means each
current sink contributes one-third of the preset current value.
Turning the Current Sinks On/Off in Preview Mode
The current sinks in preview mode are controlled programmatically by bit preview_on (page 25) or by pin GPIO0/P0. Bit
preview_on defines which sink is selected.
Turning the Current Sinks On/Off in Strobe Mode
The current sinks in strobe mode are controlled by pin STROBE/F2. This signal is called STROBE_SIGNAL. The duration
of the strobe current is dependent on the following parameters:
!In Mode 1 (selected by bit Strobe_mode (page 25)) the strobe current is started by the rising edge of the
STROBE_SIGNAL. The duration of the strobe current is defined by the value in register Strobe_mode1 (page 25) only.
The minimum duration of the strobe current is 100ms, the maximum is 800ms.
!In Mode 2 (selected by bit Strobe_mode (page 25)) the strobe current is started by the rising edge of the
STROBE_SIGNAL. The duration of the strobe current is dependent on the length of the STROBE_SIGNAL and the value in
register Strobe_mode2 (page 26).
If register Strobe_mode2 setting = 000 to 111, strob e current stops with the falling edge of STROBE_SIGNAL but is lim-
ited to the value defined in the register (100ms to 800ms).
!In Mode 3 (selected by bit Strobe_mode (page 25)) the strobe current is started by the rising edge of the
STROBE_SIGNAL and it stop s with the falling edge of the STROBE_SIGNAL. In Mode 3 there is no limitation of the strobe
time.
Table 27. Current Sink_1x Control Register
Addr: 00 Powerdown_control
This register switches the charge pump and current sinks 1x on and off.
Bit Bit Name Default Access Description
0cp_led_on See cp_led_on (page 30).
1 curr11_on 0 R/W CURR11 enable/disable signal.
0 = Switch CURR11 off.
1 = Switch CURR11 on.
2 curr12_on 0 R/W CURR12 enable/disable signal.
0 = Switch CURR12 off.
1 = Switch CURR12 on.
3 curr13_on 0 R/W CURR13 enable/disable signal.
0 = Switch CURR13 off.
1 = Switch CURR13 on.
7:4 N/A
AS3682 austria
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Data Sheet Timing Con trol of CURR11, CURR12, CURR13 in Normal Mode a nd Soft Flash Mode
www.austriamicrosystems.com Revision 2.21 25 - 43
Table 28. Current Sink_1x Mode and Control Registers
Addr: 03 Current1_control
This register controls the function of the current sinks.
Bit Bit Name Default Access Description
1:0 Strobe_mode 01b R/W
00 = S trobe mode 1 is selected. The strobe time is defined by
the value in regi st er Strobe_mode1 (page 25) the maximum
strobe time is limited to 800ms.
01 = S trobe mode 2 is selected. The strobe time is defined by
the pulse length of the STROBE_SIGNAL and in addition it is
affected by the setting of register Strobe_mode2 (page 26).
1x = S trobe mode 3 is selected. The strobe time is defined by
the pulse length of STROBE_SIGNAL. The maximum strobe time
is unlimited.
3:2 N/A
4preview_on 0R/W
0 = Current of current sinks is 0mA.
1 = Current of current sinks is defined by register
current1_preview. If preview is controlled via pin GPIO0/P0
(see bit preview_ctrl), this bit has no effect.
5preview_ctrl 0R/W
0 = Preview mode is controlled by bit preview_on (page 25).
1 = Preview mode is controlled by pin GPIO0/P0.
6strobe_on 0R/W
0 = Current of current sinks is 0mA.
1 = Current of current sinks is defined by register
Current1_strobe (page 20). If pre vi ew mode is controll e d vi a
pin STROBE/F2 (see bit xstrobe_ctrl), this bit has no effect
7xstrobe_ctrl 0R/W
0 = Strobe mode is controlled by pin STROBE/F2.
1 = Strobe mode is control l e d by bi t strobe_on (page 25).
Addr: 04 Strobe_mode1
This register se ts the strobe time in mode 1.
Bit Bit Name Default Access Description
2:0 Strobe_mode 001b R/W
000 = TS is equal to 100ms.
001 = TS is equal to 200ms.
010 = TS is equal to 300ms.
011 = TS is equ al to 400ms.
100 = TS is equal to 500ms.
101 = TS is equal to 600ms.
110 = TS is equ al to 700ms.
111 = TS is equal to 800ms.
7:3 N/A
AS3682 austria
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Data Sheet Timing Con trol of CURR11, CURR12, CURR13 in Normal Mode a nd Soft Flash Mode
www.austriamicrosystems.com Revision 2.21 26 - 43
Addr: 05 Strobe_mode2
This register sets the strobe time in mode 2.
Bit Bit Name Default Access Description
2:0 Mode2 111 R/W
000 = TS is equal to TSTROBE_SIGNAL if T_STROBE_SIGNAL. ≤ 100ms.
000 = TS is equal to 100ms is T_STROBE_SIGNAL ≥ 100ms.
001 = TS is equal to TSTROBE_SIGNAL if T_STROBE_SIGNAL ≤ 200ms.
001 = TS is equal to 200ms if T_STROBE_SIGNAL ≥ 200ms.
010 = TS is equal to TSTROBE_SIGNAL if T_STROBE_SIGNAL ≤ 300ms.
010 = TS is equal to 300ms if T_STROBE_SIGNAL ≥ 300ms.
011= TS is equal to TSTROBE_SIGNAL if T_STROBE_SIGNAL ≤ 400ms.
011 = TS is equal to 400ms if T_STROBE_SIGNAL ≥ 400ms.
100 = TS is equal to TSTROBE_SIGNAL if T_STROBE_SIGNAL ≤ 500ms.
100 = TS is equal to 500ms if T_STROBE_SIGNAL ≥ 500ms.
101 = TS is equal to TSTROBE_SIGNAL if T_STROBE_SIGNAL ≤ 600ms.
101 = TS is equal to 600ms if T_STROBE_SIGNAL ≥ 600ms.
110 = TS is equ al to TSTROBE_SIGNAL if T_STROBE_SIGNAL ≤ 700ms.
110 = TS is equ al to 700ms if T_STROBE_SIGNAL ≥ 700ms.
111 = TS is equal to TSTROBE_SIGNAL if T_STROBE_SIGNAL ≤ 800ms.
111 = TS is equal to 800ms if T_STROBE_SIGNAL ≥ 800ms.
7:3 N/A
Table 29. Current Sink_1x Undervo ltage Indicati on Register
Addr: 0F
Curr_voltage_control
This register indicates if the voltage at any current sink has dropped below a predefined
value. If the charge pump is operating in automatic-mode (default), the contents of this
register can be disregarded. The voltages at current sinks 1x are used for automatic
mode selection of the charge pump. The voltages at current sinks 2, 3, and 4 can be
optionally used for automatic mode selection of the charge pump (see register
Curr234_ctrl (page 29)).
Bit Bit Name Default Access Description
0curr11_low_voltage N/A R 0 = Normal operation.
1 = Undervoltage occurred.
1curr12_low_voltage N/A R 0 = Normal operation.
1 = Undervoltage occurred.
2curr13_low_voltage N/A R 0 = Normal operation.
1 = Undervoltage occurred.
3Curr2_low_voltage N/A R See Curr2_low_voltage (page 29).
4Curr3_low_voltage N/A R See Curr3_low_voltage (page 29).
5Curr4_low_voltage N/A R See Curr4_low_voltage (page 29).
7:6 cp_status N/A R See cp_status (page 30).
AS3682 austria
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Data Sheet Timing Con trol of CURR11, CURR12, CURR13 in Normal Mode a nd Soft Flash Mode
www.austriamicrosystems.com Revision 2.21 27 - 43
Figure 15. Preview and Strobe Timing – Mode 1
Figure 16. Preview and Strobe Timing – Mode 2
I
t
TS
TS
Maximum Strobe Time is 800ms
Strobe Time (TS) is Controlled by
Register Strobe_mode1 (page 25)
TSTROBE_SIGNAL
Bit strobe_on (page 25)
or Pin STROBE/F2
TSTROBE_SIGNAL
Normal Mode: See Register
Current1_strobe (page 20).
Soft Flash Mode: See Register
Current1_strobe (page 23).
Normal Mode: See Register
Current1_preview (page 20).
Soft Flash Mode: See Register
Current1_preview (page 23).
Bit preview_on (page 25)
or Pin GPIO0/P0
Bit strobe_on (page 25)
or Pin STROBE/F2
Soft Flash Mode
Normal Mode
TSTROBE_SIGNALTS
Bit preview_on (page 25)
or Pin GPIO0/P0
TSTROBE_SIGNAL
TS
TS
TS
Maximum Strobe Time is 800ms
Strobe Time (TS) is Controlled by
Register Strobe_mode2 (page 26)
I
t
TSTROBE_SIGNAL
Bit preview_on (page 25)
or Pin GPIO0/P0
Bit strobe_on (page 25)
or Pin STROBE/F2
Soft Flash Mode
Normal Mode
TSTSTSTROBE_SIGNAL
Normal Mode: See Register
Current1_strobe (page 20).
Soft Flash Mode: See Register
Current1_strobe (page 23).
Normal Mode: See Register
Current1_preview (page 20).
Soft Flash Mode: See Register
Current1_preview (page 23).
Bit preview_on (page 25)
or Pin GPIO0/P0
Bit strobe_on (page 25)
or Pin STROBE/F2
AS3682 austria
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Data Sheet Timing Con trol of CURR11, CURR12, CURR13 in Normal Mode a nd Soft Flash Mode
www.austriamicrosystems.com Revision 2.21 28 - 43
Figure 17. Preview and Strobe Timing – Mode 3
TS =
Maximum Strobe Time is Unlimited
I
t
TSTROBE_SIGNAL TS =
TSTROBE_SIGNAL
Bit preview_on (page 25)
or Pin GPIO0/P0
Bit strobe_on (page 25)
or Pin STROBE/F2
Normal Mode
Normal Mode: See Register
Current1_strobe (page 20).
Soft Flash Mode: See Regis-
ter Current1_strobe (page 23).
Normal Mode: See Register
Current1_preview (page 20).
Soft Flash Mode: See Register
Current1_preview (page 23).
Soft Flash Mode
TS =
TSTROBE_SIGNAL TS =
TSTROBE_SIGNAL
Bit preview_on (page 25)
or Pin GPIO0/P0
Bit strobe_on (page 25)
or Pin STROBE/F2
AS3682 austria
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Data Sheet Control of CURR2, CURR3, CURR4 in Normal Mode and Soft Flash Mode
www.austriamicrosystems.com Revision 2.21 29 - 43
11.4 Control of CURR2, CURR3, CURR4 in Normal Mode and Soft Flash Mode
CURR2, CURR3, and CURR4 are independent current sinks. The current value is determined by registers
Current2 (page 21), Current3 (page 21), and Current4 (page 22).
Any value other than zero will start the current sink. To stop the current, the register value must be set to zero.
Note: Unused current sinks should be left open and any associated register values must be set to 0mA.
Table 30. Current Sink2,3,4 Undervoltage Indication Registers
Addr: 0F
Curr_voltage_control
This register indicates if the voltage at any current sink has dropped below a predefined
value. If the charge pump is operating in automatic-mode (default), the contents of this
register can be disregarded. The voltages at current sinks 1x are used for automatic mode
selection of the charge pump. The voltages at current sinks 2, 3, and 4 can be optionally
used for automatic mode selection of the charge pump (see register Curr234_ctrl (page
29)).
Bit Bit Name Default Access Description
0curr11_low_voltage N/A R See curr11_low_voltage (page 26).
1curr12_low_voltage N/A R See curr12_low_voltage (page 26).
2Curr13_low_voltage N/A R See curr12_low_voltage (page 26).
3Curr2_low_voltage N/A R 0 = Normal operation.
1 = Undervoltage occurred.
4Curr3_low_voltage N/A R 0 = Normal operation.
1 = Undervoltage occurred.
5Curr4_low_voltage N/A R 0 = Normal operation.
1 = Undervoltage occurred.
7:6 cp_status N/A R See cp_status (page 30).
Addr: 09
Curr234_ctrl
This register defines wether th e load of the current sink is connected to pin VBAT or to pin
CP_OUT. If the load of the current sink is connected to CP_OUT, that current sink will
contribute to the charge pump mode-selection algorithm.
Bit Bit Name Default Access Description
0Curr2_onCP 0R/W
0 = The output of the current sink will not be used for automatic
mode selection of the charge pump.
1 = The output of the current sink is used for automatic mode
selection of the charge pump.
1Curr3_onCP 0R/W
0 = The output of the current sink will not be used for automatic
mode selection of the charge pump.
1 = The output of the current sink is used for automatic mode
selection of the charge pump.
2Curr4_onCP 0R/W
0 = The output of the current sink will not be used for automatic
mode selection of the charge pump.
1 = The output of the current sink is used for automatic mode
selection of the charge pump.
3Curr234_gpio0_ctrl 0R/W
0 = Curr2, Curr3, and Curr4 are switched on/off directly by
registers Current2 (page 23), Current3 (page 23), and
Current4 (page 23).
1 = Curr2, Curr3, Curr4 are switched on/off by pin GPIO0/P0 (set
bit preview_ctrl (page 25) = 1 and bit Curr234_strobe_ctrl = 0.
6:4 N/A
7Curr234_strobe_ctrl 0R/W
0 = Curr2, Curr3, and Curr4 are switched on/off directly by
registers Current2 (page 23), Current3 (page 23), and
Current4 (page 23).
1 = Curr2, Curr3, Curr4 are controlled by Strobe mode (enable at
least one of curr11_on (page 24), curr12_on (page 24), or
curr13_on (page 24).
AS3682 austria
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Data Sheet Charge Pump Control Registers
www.austriamicrosystems.com Revision 2.21 30 - 43
11.5 Charge Pump Control Registers
Addr: 00 Powerdown_control
This register switches the charge pump and current sinks_1x on and off.
Bit Bit Name Default Access Description
0cp_led_on 0 R/W Charge pump enable/disable.
0 = Switches the charge pump off.
1 = Switches the charge pump on.
1curr11_on See curr11_on (page 24).
2curr12_on See curr12_on (page 24).
3curr13_on See curr13_on (page 24).
7:4 N/A
Addr: 0D CP_control
This register sets the charge pump mode and reads the current charge pump mode.
Bit Bit Name Default Access Description
0 cp_clk 0 R/W Charge pump clock frequency selection.
0 = 1MHz
1 = 500 kHz
1cp_man 0 R/W
Charge pump mode control.
0 = Automatic mode.
1 = Manual mode.
3:2 cp_mode 00b R/W
Charge pump mode selection.
01 = N/A
01 = Charge pump mode 1:1.
10 = Charge pump mode 1:1.5.
11 = Charge pump mode 1:2.
4 cp_mode2 0 R/W Used for test purposes only.
5:7 N/A
Addr: 0F
Curr_voltage_control
This register indicates if the voltage at any current sink has dropped below a predefined
value. If the charge pump is operating in automatic-mode (default), the contents of this
register can be disregarded. The voltages at current sinks 1x are used for automatic
mode selection of the charge pump. The voltages at current sinks 2, 3, and 4 can be
optionally used for automatic mode selection of the charge pump (see register
Curr234_ctrl (page 29)).
Bit Bit Name Default Access Description
0curr11_low_voltage N/A R See curr11_low_voltage (page 26).
1curr12_low_voltage N/A R See curr12_low_voltage (page 26).
2Curr13_low_voltage N/A R See curr13_low_voltage (page 26).
3Curr2_low_voltage N/A R See Curr2_low_voltage (page 29).
4Curr3_low_voltage N/A R See Curr3_low_voltage (page 29).
5Curr4_low_voltage N/A R See Curr4_low_voltage (page 29).
7:6 cp_status N/A R 01 = Charge pump mode 1:1.
10 = Charge pump mode 1:1.5.
11 = Charge pump mode 1:2.
AS3682 austria
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Data Sheet General Purpose Inputs/Outputs
www.austriamicrosystems.com Revision 2.21 31 - 43
11.6 General Purpose Inputs/Outputs
The general purpose input/output pins (GPIO0 /P0, STROBE/F2) are highly configurable and can be used for the fol-
lowing functionality:
!Digital Schmidt-Trigger Input
!Digital Output with 4mA Driving Capability at 2.8V Supply (VDD_GPIO)
!Tristate Output
!Current Selection for CURR1x
The default mode for pins GPIO0/P0 and STROBE/F2 is input (pull-down for normal mode and pull-up for soft flash or
hard flash modes).
Note: Each general purpose pin is indepe ndent of the other general purpose pin.
Table 31. GPIO Registers
Addr: 0A GPIO_control
This register controls pins GPIO0/P0 and STROBE/F2.
Bit Bit Name Default Access Description
1:0 gpio0_mode 00b R/W
Defines the direction for pin GPIO0/P0.
00 = Input only.
01 = Output (push and pull).
10 = Output (open drain, only NMOS is active).
11 = Outp ut (open drain, only PMOS is active).
3:2 gpio0_pulls 01b Normal
Mode
10b Soft Flash
Mode R/W
Adds pullup/pulldow n functionality to pin GPIO0/P0.
00 = None
01 = Pulldown
10 = Pullup
11 = Analog input (for test purposes only).
5:4 strobe_mode 00b R/W
Defines the direction for pin STROBE/F2.
00 = Input only.
01 = Output (push and pull).
10 = Output (open drain, only NMOS is active).
11 = Outp ut (open drain, only PMOS is active).
7:6 strobe_pulls 01b Normal
Mode
10b Soft Flash
Mode R/W
Adds pullup/pulldown functionality to pin STROBE/F2.
00 = None
01 = Pulldown
10 = Pullup
11 = Analog input (for test purposes only)
Addr: 0B GPIO_output
This register selects internal signals to be switched to pins GPIO0/P0 and STROBE/F2
(if selected as output).
Bit Bit Name Default Access Description
0gpio0_out 0R/W
In normal mode, if pin GPIO0/P0 is set to output, this bit is
transferred to that output.
1strobe_out 0R/W
In normal mode, if pin STROBE/F2 is set to output, this bit
is transferred to that output.
2:7 N/A
Addr: 0C GPIO_input
This register reads the signals at pins GPIO0/P0 and STROBE/F2 (if selected as input).
Bit Bit Name Default Access Description
0gpio0_in N/A R
1strobe_in N/A R
AS3682 austria
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Data Sheet Power-On Reset
www.austriamicrosystems.com Revision 2.21 32 - 43
11.7 Power-On Reset
The internal reset is controlled by two inputs:
!VBAT1 Supply
!VDD_GPIO
If either of these voltages is lower than their limit, an internal reset is forced.
The reset levels control the state of all registers. As long as VBAT and VDD_GPIO are below their reset thresholds, the
register contents are set to default.
Access by serial interface is possible once the reset thresholds are exceeded.
Note: VVDD_GPIO_TH – Use rising or falling th reshold levels, depending on the slope of VDD_GPIO (power up/power
down).
11.8 Temperature Supervision
An integrated temperature sensor provi des over-temperature protection for the AS3682. This sensor generates a fl ag
if the device temperature reaches the over-temperature threshold (T140 page 8). The threshold has a hysteresis
(T140 page 8) to prevent oscillation effects.
If the device temperature exceeds the T140 threshold, the current sources are switched off, and bit ov_temp in register
Overtemp_control (page 32) is set to 1.
After dec r ea si n g th e te mp e rature by THYST, the current sources resume operation.
The ov_temp flag will only be reset (by the circuit when the temperatu re has reached operating condition aga in) after
the software has written a 1 and then a 0 to bit rst_ov_temp (page 32).
Bit ov_temp_on activates temperature supervision.
Table 32. Reset Contro l
Reset Control Register State (All Reg is ters)
VBAT < VPOR_VBAT and VVDD_GPIO < VGPIO_VDD_TH Undefined
VBAT < VPOR_VBAT and VVDD_GPIO > VGPIO_VDD_TH Undefined
VBAT > VPOR_VBAT an d V VDD_GPIO < VGPIO_VDD_TH Default
VBAT > VPOR_VBAT and VVDD_GPIO > VGPIO_VDD_TH Default
Access by serial interface possible.
Table 33. Overtemperature Bit Definitions
Addr: 0E Overtemp_control
This register reads and resets the overtemperature flag.
Bit Bit Name Default Access Description
0ov_temp_on 1R/W
Activates/deactivates device temp erature supervision.
0 = Temperature supervision is disabled. No current source
will be switched off if the device temperature exceeds the
over-temperature rising threshold (T140).
1 = Temperature supervision is enabled.
1ov_temp NA R
1 = Indicates that the over-temperature rising threshold
(T140) has been reached. To clear this flag, it is mandatory
to use bit rst_ov_temp. Bit ov_temp is only active if
temperature supervision is activated.
2rst_ov_temp NA R/W The ov_temp flag is cleared by first setting this bit to 1, and
then setting this bit to 0. Bit rst_ov_temp is only active if
temperature supervision is activated.
7:3 N/A
AS3682 austria
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Data Sheet Serial Interface
www.austriamicrosystems.com Revision 2.21 33 - 43
11.9 Serial Interface
The AS3682 is controlled by serial interface pins DATA/P1 and CLK/P2.
11.9.1 Features
!Fast Mode Capability (Maximum Clock Frequency is 400 kHz)
!7-Bit Addressing Mode
!4 x 8-Bit Read/Write Data Registers (Word Address 0x0 to 0x3)
!Write Formats
- Single-Byte Write
- Page-Write
!Read Formats
- Current-Address Read
- Random-Read
- Sequential-Read
!Asynchronous Reset Input (Active 0)
!No Internal System Clock
!DATA/P1 Input Delay and CLK/P2 S pike Filtering by Integrated RC Components
11.9.2 Device Address Selection
The serial interface address of the AS3682 can be selected between tw o fi xed settings. The address is selected by
connecting pin ADR to either GND or to V2_5 as shown in Table 34.
11.9.3 Dat a Transfer Formats
Definitions used in the serial data transfer format diagrams (Figures 19 to 23) are listed in Table 35.
Table 34. AS3682 Device Address Selection
ADR Connected To Serial Interface Address
GND 40h
V2_5 (Max Voltage = 2.5V) 41h
Table 35. Serial Data Transfer Byte Defi nitions
Symbol Definition
S Start Condition after Stop
Sr Repeated Start
DA Device Address
WA Word Address
A Acknowledge
N Not Acknowledge
P Stop Condition
White Field Slave as Receiver
Grey Field Slave as Transmitter
WA ++ Increment Word Address Internally
AS3682 austria
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Data Sheet Serial Interface
www.austriamicrosystems.com Revision 2.21 34 - 43
Figure 18. Complete Data Transfer
Figure 19. Byte Write
Figure 20. Page Write
Byte Write and Page Write are used to write data to the slave.
The transmission begins with the START condition, which is generated by the master when the bus is in IDLE state
(the bus is free). The device-write address is followed by the word address. After the word address any number of data
bytes can be send to the slave. The word address is incremented internally, in order to write subsequent data bytes on
subsequent address locations.
For reading data from the slave device, the master has to change the transfer direction. This can be done either with a
repeated START condition followed by the device-read address, or simply with a new transmission ST AR T followed by
the device-read address, when the bus is in IDLE state. The device-read address is always followed by the 1st register
byte transmitted from the slave. In Read Mode any number of subse quent register bytes can be read from the slave.
The word address is incremented internally.
The following diagrams show the various read formats available.
Figure 21. Random Read
Random Read and Sequential Read are combined formats. The repeated START condition is used to change the
direction after the data transfer from the master.
The word address transfer is initiated with a START condition issued by the master while the bus is idle. The START
condition is followed by the device-write address and the word address.
S
Start
Condition Address R/W ACK Data ACK Data ACK
Stop
Condition
P
SDA
SCL
1-7 8 9 1-7 89 1-7 8 9
S DA W A WA A reg_data A P
Writ e Re gis ter
WA++
S DA W A WA A reg_data 1 A reg_data 2 A … reg_data nAP
Writ e Re gis ter
WA++ Write Register
WA++ Write Re gis ter
WA++
SDAWA WA ASrDARAdata NP
Read Register
WA++ WA++
AS3682 austria
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Data Sheet Serial Interface
www.austriamicrosystems.com Revision 2.21 35 - 43
In order to change the data direction a repeated START condition is issued on the 1st SCL pulse after the ACKNOWL-
EDGE bit of the word address transfer. After the reception of the device read address, the slave becomes the transmit-
ter. In this state the slave transmits register data located by the previous received word address vector. The master
responds to the data byte with a NOT ACKNOWLEDGE, and issues a STOP condition on the bus.
Figure 22. Sequential Read
Sequential Read is the extended form of Random Read, as multiple register-data bytes are subsequently transferred.
In contrast to the Random Read, in a Sequential Read the tran sferred register-data bytes are responded to by an
ACKNOWLEDGE from the master. The number of data bytes transferred in one sequence is unlimited (consider the
behavior of the word-address counter). To terminate the transmission the master has to send a not-acknowledge fol-
lowing the last data byte and subsequently generate the STOP condition.
Figure 23. Current Address Read
To keep the access time as small as possible, this format allows a read access without the word address transfer in
advance to the data transfer. The bus is idle and the master issues a START condition followed by the Device Read
address. Analo go u s to Ran d om Read, a single byte transfer is termin at e d wi th a not-acknow l ed g e after the first regis-
ter byte. Analogous to Sequential Read an unlimited number of data bytes can be transferred, where the data bytes
must be responded to with an ACKNOWLEDGE from the master. For termination of the transmission the master sends
a NOT ACKNOWLEDGE following the last data byte and a subsequent STOP condition.
11.9.4 Fixed ID Register
Reading register 15h always returns CDh and can be used to verify the correct operation of the serial interface.
Table 36. Fixed ID Register
Addr: 15 Fixed_ID
This register holds the device ID value.
Bit Bit Name Default Access Description
7:0 Device_ID 11001101 R This is the device ID.
SDAWA WAASrDARAdata 1Adata 2 ... A data nNP
WA++Read Register
WA++
S DA R A data 1 A data 2 … A data nNP
Read Registe r
WA++ WA++Read Register
WA++
Read Register
WA++
Read Register
WA++
AS3682 austria
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Data Sheet Register Map
www.austriamicrosystems.com Revision 2.21 36 - 43
11.10 Register Map
The AS3682 control register addresses, default values, and pages where they are described are listed in Table 37
(Normal Mode) and Table 38 (Soft Flash Mode).
Table 37. Register Summary – Normal Mode
Register Name Address Default B7 B6 B5 B4 B3 B2 B1 B0 Page
Powerdown_control Addr: 00 00h N/A curr13_on curr12_on curr11_on cp_led_on 24,
30
Current1_preview Addr: 01 00h current1_preview N/A curr_hp 20
Current1_strobe Addr: 02 00h current1_strobe N/A curr_hs 20
Current1_control Addr: 03 01h xstrobe_ctrl strobe_on preview_ctrl preview_on N/A Strobe_mode 25
Strobe_mode1 Addr: 04 07h N/A Strobe_mode 25
Strobe_mode2 Addr: 05 07h N/A Mode2 26
Current2 Addr: 06 00h N/A Current2 21
Current3 Addr: 07 00h N/A Current3 21
Current4 Addr: 08 00h N/A Current4 22
Curr234_ctrl Addr: 09 00h Curr234_str
obe_ctrl N/A Curr234_g
pio0_ctrl Curr4_onCP Curr3_onCP Curr2_onCP 29
GPIO_control Addr: 0A 44h strobe_pulls strobe_mode gpio0_pulls gpio0_mode 31
GPIO_output Addr: 0B 00h N/A strobe_out gpio0_out 31
GPIO_input Addr: 0C N/A N/A strobe_in gpio0_in 31
CP_control Addr: 0D 00h N/A cp_mode2 cp_mode cp_man cp_clk 30
Overtemp_control Addr: 0E 01h N/A rst_ov_temp ov_temp ov_temp_on 32
Curr_voltage_control Addr: 0F N/A cp_status Curr4_low_
voltage Curr3_low_
voltage Curr2_low_
voltage curr13_low_
voltage curr12_low_
voltage curr11_low_
voltage 30
Curr_voltage_control Addr: 0F N/A cp_status Curr4_low_
voltage Curr3_low_
voltage Curr2_low_
voltage curr13_low_
voltage curr12_low_
voltage curr11_low_
voltage 26
Curr_voltage_control Addr: 0F N/A cp_status Curr4_low_
voltage Curr3_low_
voltage Curr2_low_
voltage curr13_low_
voltage curr12_low_
voltage curr11_low_
voltage 29
Fixed_ID Addr: 15 CDh 1 1 0 0 1 1 0 1 35
Table 38. Register Summary – Soft Flash Mode
Register Name Address Default B7 B6 B5 B4 B3 B2 B1 B0 Page
Powerdown_control Addr: 00 00h N/A curr13_on curr12_on curr11_on cp_led_on 24,
30
Current1_preview Addr: 01 00h current1_preview 23
Current1_strobe Addr: 02 00h current1_strobe 23
Current1_control Addr: 03 01h xstrobe_ctrl strobe_on preview_ctrl preview_on N/A Strobe_mode 25
Strobe_mode1 Addr: 04 07h N/A Strobe_mode 25
Strobe_mode2 Addr: 05 07h N/A Mode2 26
Current2 Addr: 06 00h Current2 23
Current3 Addr: 07 00h Current3 23
Current4 Addr: 08 00h Current4 23
Curr234_ctrl Addr: 09 00h Curr234_str
obe_ctrl N/A Curr234_g
pio0_ctrl Curr4_onCP Curr3_onCP Curr2_onCP 29
GPIO_control Addr: 0A 88h strobe_pulls strobe_mode gpio0_pulls gpio0_mode 31
GPIO_output Addr: 0B 00h N/A strobe_out gpio0_out 31
GPIO_input Addr: 0C N/A N/A strobe_in gpio0_in 31
CP_control Addr: 0D 00h N/A cp_mode2 cp_mode cp_man cp_clk 30
Overtemp_control Addr: 0E 01h N/A rst_ov_temp ov_temp ov_temp_on 32
Curr_voltage_control Addr: 0F N/A cp_status Curr4_low_
voltage Curr3_low_
voltage Curr2_low_
voltage curr13_low_
voltage curr12_low_
voltage curr11_low_
voltage 30
Curr_voltage_control Addr: 0F N/A cp_status Curr4_low_
voltage Curr3_low_
voltage Curr2_low_
voltage curr13_low_
voltage curr12_low_
voltage curr11_low_
voltage 26
Curr_voltage_control Addr: 0F N/A cp_status Curr4_low_
voltage Curr3_low_
voltage Curr2_low_
voltage curr13_low_
voltage curr12_low_
voltage curr11_low_
voltage 29
Fixed_ID Addr: 15 CDh 1 1 0 0 1 1 0 1 35
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Data Sheet Capacitor and Resistor Selection
www.austriamicrosystems.com Revision 2.21 37 - 43
12 External Components
12.1 Capacitor and Resistor Selection
Use low-ESR ceramic capacitors with X7R or X5R dielectric – these capacitors allow good filte r ing and have a wide
temperature range. The connections of all external capacitors should be kept as short as possible.
All resistors should have a tolerance of ±1%.
12.2 Usage of PCB Wire Inductance
The inductance between the battery and pins VBAT1 and VBAT2 can be used as a filter to reduce disturbance on the bat-
tery. Instead of using one capacitor (C1) it is recommended to split C1 into C11 and C12 with the capacitance equal:
C11 = C12 = 1/2 x C1(EQ 1)
It is recommended to apply a minimum of 20nH (maximum 200nH) with low impedance. Th is inductance can be real-
ized on the PCB without any discrete coil. Assuming that 1mm signal line corresponds to approximately 1nH (valid if
the length (L) is significantly bigger than the width (W) of the line (L/W <10)). Thus a line length of:
20mm < L < 200mm (EQ 2)
is recommended. The shape of the line is not important.
Figure 24. PCB Wire Inductance Example 1
Figure 25. PCB Wire Inductance Example 2
12.3 External Component Specifications
Notes:
1. See Usage of PCB Wire Inductance on page 37.
Table 39. External Components List
Part
Number Value Tol
(Min) Rating
(Max) Notes Package
(Min)
Min Typ Max
C112.2µF ±20% 6.3V Ceramic, X5R 0603
C3 1µF 4.7µF ±20% 6.3V Ceramic, X5R 0603
C4 1µF ±20% 6.3V Ceramic, X5R 0603
C5 1µF ±20% 6.3V Ceramic, X5R 0603
C6 2.2µF ±20% 6.3V Ceramic, X5R 0603
R1 240kΩ±1% B ias Resistor 0201
L
PIN VBAT
BATTERY
Connector
L_total=L
CinCbat
GNDGND
C11C12
Pins VBAT1
and VBAT2
PIN VBAT
BATTERY
Connector CinCbat
GNDGND
L1
L2
L_total=L1+10xL2
C11C12
Pins VBAT1
and VBAT2
AS3682 austria
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Data Sheet Hard Flash Mode Pin Descriptions
www.austriamicrosystems.com Revision 2.21 38 - 43
13 Pinout and Packaging
13.1 Hard Flash Modes Pin Descriptions
Table 40. Pin Type Definitions
Type Description
DI Digital Input
DI3 3.3V Digital Input
DIO3 3.3V Digital Input/Ou tput
AIO Analog Pad
AI Analog Input
AO Analog Output
S Supply Pad
GND Ground Pad
Table 41. Pin List QFN24 – Hard Flash Modes
Pin Name Type (See
Table 40) Description
1 ADR DI Test input.
2V
BAT1 AIO Charge pu mp supply pad; always connect to VBAT.
3C
1_P AIO Charge pump flying capacitor; connect to a ceramic capacitor of 2.2µF (±20%).
4CP_OUT AIO
Charge pump output voltage; connect to a ceramic capacitor of 1µF (±20%) or 2.2µF
(+100%/-50%).
5C
2_P AIO Charge pump flying capacitor; connect to a ceramic capacitor of 2.2µF (±20%).
6V
BAT2 SCharge pu mp supply pad; always connect to VBAT.
7C
2_N AIO Charge pump flying capacitor; connect to a ceramic capacitor of 1µF (±20%).
8CLK/P2 DI3
MSB of Preview Control; internal pullup, active low.
9 DATA/P1 DIO3 LSB+1/MSB of Preview Control; internal pullup, active low.
10 GPIO0/P0 DIO3 LSB of Preview Control; internal pullup, active low.
11 STROBE/F2 DIO3 MSB of Flash Con trol; internal pullup, active low.
12 VDD_GPIO SGPIO and serial interface suppl y pad.
13 CURR11 AI Analog current sink input.
14 CURR12 AI Analog current sink input.
15 CURR13 AI Analog current sink input.
16 SFL/F1 DI3 LSB+1 of Flash Control; internal pullup, active low.
17 T1/F0 DI3 LSB of Flash Control; internal pullup, active low .
18 HFL DI Hard Flash mode selection pin; connect to VBAT.
19 CURR2AI Analog current sink input.
20 CURR3AI Analog current sink input.
21 CURR4AI Analog current sink input.
22 V2_5 AO Low-power LDO output voltage; always connect to a ceramic capacitor of 1µF
(±20%) or 2.2µF (+100%/-50%).
Caution: Do not load this pin durin g start-up.
23 RBIAS AIO External resistor; always connect to a resistor of 240kΩ (±1%) to ground.
Caution: Do not load this pin.
24 C1_N AIO Charge pump flying capacitor; connect to a ceramic capacitor of 1µF (±20%).
25 VSS GND Exposed pad.
AS3682 austria
micro
systems
Data Sheet Normal Mode and Soft Flash Mode Pin Descriptions
www.austriamicrosystems.com Revision 2.21 39 - 43
13.2 Normal Mode and Soft Flash Mode Pin Descriptions
Table 42. Pin List QFN24 – Normal Mode and Soft Flash Mode
Pin Name Type (See
Table 40) Description
1 ADR DI Inpu t pin to select serial interface address. Connect to V2_5 or VSS.
2V
BAT1 SCharge pu mp supply pad; always connect to VBAT.
3C
1_P AIO Charge pump flying capacitor; connect to a ceramic capacitor of 2.2µF (±20%).
4CP_OUT AIO
Charge pump output voltage; connect to a ceramic capacitor of 1µF (±20%) or 2.2µF
(+100%/-50%).
5C2_P AIO Charge pump flying capacitor; connect to a ceramic capacitor of 2.2µF (±20%).
6V
BAT2 SCharge pu mp supply pad; always connect to VBAT.
7C
2_N AIO Charge pump flying capacitor; connect to a ceramic capacitor of 1µF (±20%).
8CLK/P2 DI3
Serial interface clock input.
9 DATA/P1 DIO3 Serial interface data I/O.
10 GPIO0/P0 DIO3 General purpose I/O; active high in Normal Mode, active low in Soft Flash Mode.
11 STROBE/F2 DIO3 Gene ral purpose I/O; active high in Normal Mode, active low in Soft Flash Mode.
12 VDD_GPIO SGPIO and serial interface supply pad.
13 CURR11 AI Analog current sink input (intended for LED flash).
14 CURR12 AI Analog current sink input (intended for LED flash).
15 CURR13 AI Analog current sink input (intended for LED flash).
16 SFL/F1 DI3 Soft Flash mode selection pin.
17 T1/F0 DI3 Test input.
18 HFL DI Hard Flash mode sel e cti o n pi n ; active high.
19 CURR2AI Analog current sink input.
20 CURR3AI Analog current sink input.
21 CURR4AI Analog current sink input.
22 V2_5 AO Low-power LDO output voltage; always connect to a ceramic capacitor of 1µF
(±20%) or 2.2µF (+100%/-50%).
Caution: Do not load this pin durin g start-up.
23 RBIAS AIO External resistor; always connect to a resistor of 240kΩ (±1%) to ground.
Caution: Do not load this pin.
24 C1_N AIO Charge pump flying capacitor; connect to a ceramic capacitor of 1µF (±20%).
25 VSS GND Exposed pad.
AS3682 austria
micro
systems
Data Sheet Package Drawings and Markings
www.austriamicrosystems.com Revision 2.21 40 - 43
13.3 Package Drawings and Markings
Figure 26. QFN 24 – 4x4mm with Exposed Paddle
Marking: Line 1: austriamicrosystems Logo
Line 2: AYWWIZZ
A = Pb-Free Identifier
Y = Year
WW = Week
I = Plant Identifier
ZZ = Letters of Free Choice
Line 3: AS3682A
Line 4: <Empty> = Normal Mode, Soft Flash Mode, and Hard Flash Mode 1
HFL2 = Hard Flash Mode 2
AS3682 austria
micro
systems
Data Sheet Package Drawings and Markings
www.austriamicrosystems.com Revision 2.21 41 - 43
Figure 27. QFN 24 – Detail Dimensions
AS3682 austria
micro
systems
Data Sheet
www.austriamicrosystems.com Revision 2.21 42 - 43
14 Ordering Information
Where:
Device
ID Part
Number Package
Type Delivery
Form* Mode Description
AS3682-PDM
AS3682-EA1
QFN 24
Tape and Reel Normal Mode, Soft
Flash Mode, H ar d
Flash Mode 1 4x4x0.85mm,
Pitch = 0.5mm
AS3682-EB1 Tube
AS3682-EA2 Tape and Reel Hard Flash Mode 2
AS3682-EB2 Tube
P = Package Type:
E = QFN 4x4x0.85mm
D = Delivery Form:
A = Tape and Reel
B = Tube
M = Mode
1 = Normal Mode, Soft Flash Mode, and Hard Flash Mode 1
2 = Hard Flash Mode 2
* Dry-pack sensitivity level = 3 in accordance with IPC/JEDEC J-STD-033A.
AS3682 austria
micro
systems
Data Sheet
www.austriamicrosystems.com Revision 2.21 43 - 43
Copyrights
Copyright © 1997-2006, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe.
Tr ademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged, trans-
lated, stored, or used without the prior written consent of the copyright owner.
All products and companies mentioned are trademarks or registered trademarks of their respective companies.
Disclaimer
Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing
in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutor y, implied, or by description regarding
the information set forth herein or rega rd i ng th e fre e do m of the described devices from patent infringement. austriami-
crosystems AG reserves the right to change specifications and prices at any time and withou t notice. Therefore, prior
to designing this product into a system, it is necessary to check with austriamicrosystems AG for current information.
This product is intended for use in normal commercial applications. Applicati ons requiring extended temperature
range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-
sustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for
each application. For shipments of less than 100 parts the manufacturing flow might show deviations from the standard
production flow, such as test flow or test location.
The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However,
austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but no t limited to
personal injury, property damage, loss of profits, loss of use, interrup ti on of business or indirect, special, incidental or
consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the tech-
nical data herein. No obligation or liability to recipient or any third party shall arise or flow out of
austriamicrosystems AG rendering of technical or other services.
Cont act Information
Headquarters
austriamicrosystems AG
A-8141 Schloss Premstaetten, Austria
Tel: +43 (0) 3136 500 0
Fax: +43 (0) 3136 525 01
For Sales Offices, Distributors and Representatives, please visit:
http://www.austriamicrosystems.com
austria
micro
systems
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