AS3676 AMSCO
Document overview
- Manufacturer or author: Provided By digicamel.com
- PDF pages: 92
Technical content
Datasheet sections
- 1 General Description
- 2 Key Features
- 3 Applications
- 4 Pinout
- 4.1 Pin Definitions
- 5 Absolute Maximum Ratings
- 6 Electrical Characteristics
- 7 Typical Operating Characteristics
- 8 Detailed Description
- 8.1 Analog LDO
- 8.2 Step Up DC/DC Converter
- 8.3 Charge Pump
- 8.4 Current Sinks
- 8.5 General Purpose Input / Output
- 8.6 LED Test
- 8.7 Analog-to-Digital Converter
- 8.8 Audio controlled LEDs
- 8.9 Power-On Reset
- 8.10 Temperature Supervision
- 8.11 Serial Interface
- 8.12 Operating Modes
- 9 Register Map
- 10 External Components
- 11 Package Drawings and Markings
- 11.1 Tape & Reel Information
- 12 Ordering Information
The technical content of this austriamicrosystems datasheet is still valid. Contact information: Headquarters: ams AG Tobelbaderstrasse 30
8141 Unterpremstaetten, Austria
Tel: +43 (0) 3136 500 0 e-Mail: ams_sales@ams.com Please visit our website at www.ams.com
Flexible Lighting Management (CP, DCDC, 13 Current Sinks, ADC, LED Test, LDO, DLS and Ambient Light sensing) www.austriamicrosystems.com/AS3676 1v1-4 1 - 91 (ptr) Datasheet
1 General Description
The AS3676 is a highly-integrated CMOS Power and Lighting Management Unit for mobile telephones, and other 1-cell Li+ or 3-cell NiMH powered devices. The AS3676 incorporates one Step Up DC/DC Con- verter for white backlight LEDs, one high-power Charge Pump, one Analog-to-Digital Converter, 13 current sinks, LED in-circuit function test, a two wire serial interface, and control logic all onto a single device. It supports ambient light sensor processing and a Dynamic Lumi- nance Scaling (DLS) input. Output voltages and output currents are fully programmable. The AS3676 is part of the austriamicrosystems AS3675, AS3687/87XM and AS3689 lighting management unit family. It is software compatible to AS3687/87XM and AS3689 and pin and software compatible to AS3675.
2 Key Features
High-Efficiency Step Up DC/DC Converter - Up to 26V/50mA for White LEDs - Programmable Output Voltage with External Resis- tors and Serial Interface - Over voltage Protection High-Efficiency High-Power Charge Pump - 1:1, 1:1.5, and 1:2 Mode - Automatic Up Switching (can be disabled and 1:2 mode can be blocked) - Output Current up to 400mA/500mA pulsed - Efficiency up to 95% - Very Low effective Resistance (2.5 typ. in 1:1.5) - Only 4 External Capacitors Required: 2 x 1µF Flying Capacitors, 2 x 2.2µF Input/Output Capacitors - Supports LCD White Backlight LEDs, or RGB LEDs 13 Current Sinks - All 13 current sinks fully Programmable (8-bit) from: 0.15mA to 38.5mA (up to 75.6mA for CURR30...CURR33) - Three current sinks are High Voltage capable (CURR1, CURR2, CURR6) - Programmable Hardware Control (Strobe, and Pre- view or PWM) - Selectively Enable/Disable Current Sinks - Dynamic Luminance Scaling (DLS) support to improve backlight operating time (can adjust any current source) - Light Sensor input with internal hardware process- ing to control backlight according to ambient light using 3 groups - any current source can select one of the groups or no light sensor control Internal PWM Generation - 8 Bit resolution - Autonomous Logarithmic up/down dimming Led Pattern Generator - Autonomous driving for Fun RGB LEDs - Support indicator LEDs 10-bit Successive Approximation ADC - 27µs Conversion Time - Selectable Inputs: VANA/GPI, GPIO1/DLS, GPIO2/LIGHT, all current sources, VBAT, CPOUT, DCDC_FB - Internal Temp. Measurement - Light Sensor input with Java support (JSR-256): read ADC processed value Support for automatic LED testing (open and shorted LEDs can be identified) Strobe Timeout protection - Up to 1600ms - Three different timing modes Two General Purpose Inputs/Output - GPIO1/DLS, GPIO2/LIGHT - Digital Input, Digital Output using VANA/GPI sup- ply and Tristate - GPIOs Programmable Pull-Up/Down Programmable LDO - 1.8 to 3.35V, 150mA - Programmable via Serial Interface Standby LDO always on - Regulated 2.5V max. output 10mA - 3µA Quiescent Current Audio can be used to drive RGB LED(s) - Color and Brightness depends on audio amplitude Wide Battery Supply Range: 3.0 to 5.5V Two Wire Serial Interface Control Over current and Thermal Protection WL-CSP30 3x2.5mm, 0.5mm pitch Package
3 Applications
Power- and lighting-management for mobile telephones and other 1-cell Li+ or 3-cell NiMH powered devices. ams AG Technical content still valid
Figure 1. AS3676 Block Diagram
4 Pinout
Table 1. Pin Description for AS3676 A6 DATA DIO Serial interface data input/output. B5 DCDC_GATE AO DCDC gate driver. B6 CLK DI Clock input for serial interface. C4 VBAT S Supply pad. Connect to battery. C6 DCDC_SNS AI Sense input of shunt resistor for Step Up DC/DC Converter. D6 DCDC_FB AI DCDC feedback. Connect to resistor string.
4.1 Pin Definitions
Table 2. Pin Type Definitions
5 Absolute Maximum Ratings
6 Electrical Characteristics
Table 3. Absolute Maximum Ratings Table 4. Operating Conditions
7 Typical Operating Characteristics
Figure 2. DCDC Step Up Converter: Efficiency of +15V, Figure 3. Charge Pump: Efficiency vs. VBAT Figure 4. Charge Pump: Battery Current vs. VBAT Figure 5. Current Sink CURR1 vs. V(CURRx) Figure 6. Figure 7. Current Sink CURR3x vs. VBAT
Figure 8. Charge Pump Input and Output Ripple F igure 9. Charge Pump Input and Output Ripple VBAT = 3.6V, TA = +25ºC (unless otherwise specified).
8 Detailed Description
8.1 Analog LDO
best compromise between quiescent current and regulator performance for battery powered devices. enables the device to deliver up to 150mA even at nearly discharged batteries without any decrease in performance. The LDO is off by default after start-up. Figure 10. Analog LDO Block Diagram Table 5. Electrical Characteristics
- Not production tested – guaranteed by design and laboratory verification
- During startup of the LDO the current limit is half the value of ILIMIT
8.1.1 LDO Registers
Table 6. Reg. control Register current sinks, the Step Up DC/DC Converter, and low-power mode.
0 Analog LDO is switched off
1 Analog LDO is switched on
Table 7. LDO Voltage Register This register sets the output voltage (VANA/GPI) for the LDO. Controls LDO voltage selection.
8.2 Step Up DC/DC Converter
The Step Up DC/DC Converter is a high-efficiency current mode PWM regulator, providing output voltage up to e.g. 25V/50mA1. A constant switching-frequency results in a low noise on the supply and output voltages. Figure 11. Step Up DCDC Converter Block Diagram Option: Current Feedback with Over voltage protection
- The AS3676 internal driver structure allows output voltage higher than 25V. The Over voltage Protection in
nal components used (maximum voltage rating of Q1, C9 and D1). Table 8. Step Up DC/DC Converter Parameters For constant voltage control. on CURR1, CURR2 or CURR6 in regulation.
bit step_up_prot is set, the total startup time can exceed 2ms. constant voltage source), the capacitors C7 and C8 can be removed.
8.2.1 Feedback Selection
Register DCDC control1 and DCDC control2 selects the type of feedback for the Step Up DC/DC Converter. between CURR1, CURR2 and CURR6 (the lowest voltage of these current sinks is used). (unregulated) paths or enable the register bit step_up_fb_auto.
8.2.2 Over voltage Protection in Current Feedback Mode
DCDC_FB drops below 1.25V, the DCDC automatically resumes operation. If the over voltage protection is not used in current feedback mode, connect DCDC_FB to ground. Figure 12. Step Up DC/DC Converter Detail Diagram; Option: Regulated Output Current, Feedback is
- If the DCDC converter is only used in current feedback mode (CURR1, CURR2 or CURR6 - and not used
for a constant voltage source), the capacitors C7 and C8 can be removed.
8.2.3 Voltage Feedback
be soldered in this operating mode.
8.2.4 PCB Layout Hints
AS3676 VSS. This ensures that local high-frequency currents will not flow to the battery.
8.2.5 Unused DCDC converter
If the DCDC converter is not used, connect DCDC_SNS to GND. DCDC_FB3 and DCDC_GATE can be left open. Table 9. Voltage Feedback Example Values
8.2.6 Step up Registers
- DCDC_FB can be used as a general purpose ADC input (see Analog-to-Digital Converter on page 65)
Table 10. Reg. control Register Table 11. DCDC control1 Register This register controls the Step Up DC/DC Converter.
01 M H z
00 DCDC_FB enabled (external resistor divider).
01 CURR1 feedback enabled (feedback via LEDs)
10 CURR2 feedback enabled (feedback via LEDs)
11 CURR6 feedback enabled (feedback via LEDs)
Defines the tuning current at pin DCDC_FB.
8.3 Charge Pump
- battery current = output current.
- battery current = 1.5 times output current.
Table 12. DCDC control2 Register
1 Select 1 if DCDC_FB is used with external
0 Accurate output voltage, more ripple
1 Elevated output voltage, less ripple
0 No over voltage protection
1 Over voltage protection on pin DCDC_FB
0 Normal current limit
current sinks CURR1, CURR2 and CURR6.
current sink and on the Charge Pump switch. Efficiency 95%. current sink and 250mV on the Charge Pump. Efficiency 66%. Figure 13. Charge Pump Pin Connections Note: The connections of the external capacitors C2, C3, C4 and C5 should be kept as short as possible. Table 13. Charge Pump External Components
The maximum voltage on the flying capacitors C3 and C4 is VBAT.
8.3.1 Charge Pump Mode Switching
To avoid switching into 1:2 mode (battery current = 2 times output current), set cp_mode_switching = 01. Table 14. Charge Pump Characteristics
Figure 14. Automatic Mode Switching
8.3.2 Soft Start
charge pump on and also at each switching condition. This precaution reduces electromagnetic radiation significantly.
8.3.3 Unused Charge Pump
CPOUT should be left open and keep register cp_on and cp_auto_on at 0 (default value).
8.3.4 Charge Pump Registers
Table 15. Reg. control Register This register controls the Charge Pump.
0 Set Charge Pump into 1:1 mode (off state) unless
1 Enable manual or automatic mode switching
Table 16. CP control Register
- Direct switching from 1:1.5 mode into 1:2 in manual mode and vice versa is not allowed. Always switch over 1:1
10 Manual Mode switching; register cp_mode defines
11 Reserved
0 Mode switching debounce timer is always 240µs
0 Charge Pump is switched on/off with cp_on
Table 17. CP mode Switch1 Register Table 18. CP mode Switch2 Register
Table 19. Curr low voltage status1 Register Table 20. Curr low voltage status2 Table 18. CP mode Switch2 Register (Continued)
8.4 Current Sinks
can also be used for buzzers or vibrators. All current sinks have an integrated over voltage protection. configuration) see Feedback Selection on page 12. lighting, indicator LEDs or RGB LEDs. Current sinks RGB1, RGB2, and RGB3 are general purpose current sinks e.g. for a fun LED. Current sinks CURR4x (CURR41, CURR42, and CURR43) are general purpose current sinks.
8.4.1 Unused Current Sinks
Unused current sinks can be left open or used as a ADC input (see Analog-to-Digital Converter on page 65). Table 21. Current Sink Function Overview
8.4.2 High Voltage Current Sinks CURR1, CURR2, CURR6
The high voltage current sinks have a resolution of 8 bits. Table 22. HV Current Sinks Characteristics
- Variation between currents within this group
- Variation between the programmed current and the actual current
Table 23. Curr1 current Register This register controls the High voltage current sink current. Table 24. Curr2 current Register This register controls the High voltage current sink current.
Table 25. curr6 current Register This register controls the High voltage current sink current. Table 26. curr12 control Register Table 27. curr rgb control This register select the mode of the current sinks CURR6.
8.4.3 Current Sinks CURR30, CURR31, CURR32, CURR33
vidually with curr30_current – curr33_current or common with curr3x_strobe or curr3x_preview. Table 28. Current Sinks CURR30,31,32,33 Parameters
- Variation between currents within this group
- Variation between the programmed current and the actual current
0.2 CPO
Table 29. Curr3 control2 Register This register selects the modes of the current sinks30..33 current.
1 CURR30 is strobe input; CURR1, CURR2,
Table 30. Curr3 strobe control Register This register selects the modes of the current sinks30..33 current. Table 29. Curr3 control2 Register (Continued) This register selects the modes of the current sinks30..33 current.
Table 31. Curr3x strobe Register Table 32. Curr3x preview Register Table 30. Curr3 strobe control This register selects the modes of the current sinks30..33 current.
Table 33. Curr3x other Register Table 34. Curr30 current Register Table 35. Curr31 current Table 36. Curr32 current
Table 37. Curr33 current Register Table 38. curr3 control1 Register
Table 39. Pattern control Register
8.4.4 Current Sinks RGB1, RGB2, RGB3
These current sinks have a resolution of 8 bits and can sink up to 38.25mA. Table 40. Current Sinks RGB1, RGB2, RGB3 Parameters
- Variation between currents within this group
- Variation between the programmed current and the actual current
Table 41. curr rgb control Register
Table 42. Rgb1 current Register This register controls the RGB current sink current. Table 43. Rgb2 current Register This register controls the RGB current sink current. Table 44. Rgb3 current This register controls the RGB current sink current.
8.4.5 General Purpose Current Sinks CURR4x
These low voltage current sinks have a resolution of 8 bits and can sink up to 38.25mA. Table 45. CURR4x Sinks Characteristics
- Variation between currents within this group
- Variation between the programmed current and the actual current
Table 46. curr4 control Register
8.4.6 LED Pattern Generator
each bit). The pattern itself can be started every second, every 2nd, 3rd up to 7th second4. 0 and their programmed current. on the pattern (set register cp_auto_on on page 20=1) to reduce the overall current consumption. crosystems Android driver to ensure this. Table 47. Curr41 current Register This register controls the curr41 current sink current. Table 48. Curr42 current Register This register controls the curr42 current sink current. Table 49. Curr43 current This register controls the curr43 current sink current.
- All times can be extended by a factor of 8 by setting pattern_slow=1 (this result in a delay of up to 56s)
With the AS3676 smooth fade-in and fade-out effects can be automatically generated. Figure 18. Soft dimming example Waveform for CURR30-32 Figure 19. Soft dimming example Waveform for CURR30-32 Table 50. Pattern data0...Pattern data3 Registers This registers contains the pattern data for the current sinks.
- Update any of the pattern register only if none of the current sources is connected to the pattern generator
0 R/W Pattern data0
Table 51. Pattern control Register
0 Pattern generator directly control current
- If softdim_pattern=1, don’t set curr30_mode, curr31_mode, curr32_mode or curr33_mode to 11b.
Table 52. gpio current Register Table 53. Pattern End Register
- pattern_end toggles whenever the AS3676 is in active mode (see Section 8.12 Operating Modes on page 80)
even if no pattern data has been setup. Table 54. LED Pattern timing
8.4.7 PWM Generator
the current sinks and therefore depending on its duty cycle change the brightness of an attached LED.
- Even by setting 000 for pattern delay, there is a small delay before the new patterns starts.
currX_adder must not exceed 255). currX_current - 1 must not be below zero). another channel e.g. CURR31 from 20% to 120% of curr31_current. dimming 0). This can be used to identify the exact time, when up/down dimming is finished. Table 55. PWM Dimming Table
Table 56. Pwm control Register 01b logarithmic up dimming (codes are increased).
Table 57. pwm code Register This register controls the Pwm code. Table 58. Adder Current 1 Register Table 56. Pwm control Register (Continued)
Table 59. Adder Current 2 Register Table 60. Adder Current 3 Register Table 61. Adder Current 4 Register Table 62. Adder Enable 1 Register
0 Normal Operation of the current source
Table 63. Adder Enable 2 Table 62. Adder Enable 1
8.4.8 ALS - Ambient Light Sensing
amb_on=1, this filter is pre-loaded with the initial value from the ADC to startup the filter at a defined condition. Table 64. Subtract Enable
0 Direct Operation (no inversion)
- adc_select=0 (select GPIO2/LIGHT input)
Table 63. Adder Enable 2 Register (Continued)
www.austriamicrosystems.com/AS3676 1v1-4 48 - 91 AS3676 Datasheet - Detailed Description This filtered signal can be readout from the register amb_result<7:0>. Each of the available three channels (N=1, 2 or 3) has six 8-bit registers: - groupN_y0: define current multiplier for values below groupN_X1 - groupN_y3: define current multiplier for high values (actual starting point defined by groupN_x1,groupN_k1 and groupN_x2,groupN_k2) - groupN_x1, groupN_k1: If ADC reading is > groupN_x1 then groupN_k1 divided by 32 defines the slope of the first ramp - groupN_x2, groupN_k2: If ADC reading is > groupN_x2 then groupN_k2 divided by 32 defines the slope of the second ramp Each current sources has a 2 bit register (currX_amb_group) to select None, Group1, Group2 or Group3 of ambient light sensing. The calculations are done every 1ms resulting in a flicker-free 1000Hz update rate of the current sources. Note: A current source should not use adder or subtractor current at the same time together with ALS (e.g. curr1_adder=1 and curr1_amb_group=01, 10 or 11). For details see austriamicrosystems application note AN3676_ALS_with_adder_current. ams AG Technical content still valid
Figure 23. Ambient Light Sensor internal circuit Table 65. ALS control Register
Table 66. ALS filter Register Table 67. ALS offset Register Table 68. ALS result Register Table 65. ALS control Register (Continued)
Table 69. ALS curr12 group Register
00 None - no ambient light sensor control
01 Group 1
10 Group 2
11 Group 3
Table 70. ALS rgb group Register
Table 71. ALS curr3x group Register Table 72. ALS curr4x group Register
Table 73. ALS group 1 Y0 Register Table 74. ALS group 1 Y3 Register Table 75. ALS group 1 X1 Register Table 76. ALS group 1 K1 Register Table 77. ALS group 1 X2 Register Table 78. ALS group 1 K2 Register Table 72. ALS curr4x group Register (Continued)
Table 79. ALS group 2 Y0 Register Table 80. ALS group 2 Y3 Register Table 81. ALS group 2 X1 Register Table 82. ALS group 2 K1 Register Table 83. ALS group 2 X2 Register Table 84. ALS group 2 K2 Register Table 85. ALS group 3 Y0 Register Table 86. ALS group 3 Y3 Register
8.4.9 DLS - Dynamic Luminance Scaling Input
sate for a reduced brightness backlight. Note: If the input signal from the PWM (e.g. for DLS) is '0', the voltage on the current sink is captured with a S/H. Do not enable DLS operation using the DCDC step up converter if the input GPIO1/DLS is continuously at 0. Table 87. ALS group 3 X1 Register Table 88. ALS group 3 K1 Register Table 89. ALS group 3 X2 Register Table 90. ALS group 3 K2 Register Table 91. DLS Input Parameters
Figure 24. DLS (Dynamic Luminance Scaling) internal circuit shown for a single current sink Table 92. DLS mode control1 Register
0 CURR30 current sink is not combined with DLS
1 CURR30 current sink is combined with DLS
0 CURR31 current sink is not combined with DLS
1 CURR31 current sink is combined with DLS
0 CURR32 current sink is not combined with DLS
1 CURR32 current sink is combined with DLS
0 CURR33 current sink is not combined with DLS
1 CURR33 current sink is combined with DLS
0 RGB1 current sink is not combined with DLS
1 RGB1 current sink is combined with DLS
0 RGB2 current sink is not combined with DLS
1 RGB2 current sink is combined with DLS
0 RGB3 current sink is not combined with DLS
1 RGB3 current sink is combined with DLS
Table 93. DLS mode control2
0 CURR1 current sink is not combined with DLS
1 CURR1 current sink is combined with DLS
8.5 General Purpo se Input / Output
0 CURR2 current sink is not combined with DLS
1 CURR2 current sink is combined with DLS
0 CURR41 current sink is not combined with DLS
1 CURR41 current sink is combined with DLS
0 CURR42 current sink is not combined with DLS
1 CURR42 current sink is combined with DLS
0 CURR43 current sink is not combined with DLS
1 CURR43 current sink is combined with DLS
0 CURR6 current sink is not combined with DLS
1 CURR6 current sink is combined with DLS
Table 94. GPIO Pin Function Summary
- As VANA/GPI is used as a power supply for GPIO1/DLS, GPIO2/LIGHT, it is not recommended to use it as a
Table 93. DLS mode control2 Register (Continued)
Figure 25. GPIOs and VANA/GPI Blockdiagram
8.5.1 Unused GPIO Pins
default, will pull them to GND).
8.5.2 GPIO Characteristics
Table 95. GPIO DC Characteristics
8.5.3 GPIO Registers
Table 96. GPIO output 1 Register This register controls GPIO outputs.
Table 97. GPIO signal 1 Register This register controls GPIO outputs. Table 98. GPIO output 2 Register This register controls GPIO outputs. of any other bit setting e.g., gpio1_mode Table 100.
Table 99. GPIO signal 2 Register This register controls GPIO outputs. Table 100. GPIO control Register This register controls GPIO and GPIO1 pin functions.
00 Input only
01 Output (push and pull)
10 Output (open drain, only push; only NMOS is
11 Output (open drain, only pull; only PMOS is
00 None
01 Pulldown
10 Pullup
11 ADC input (gpio1_mode = XX); recommended
11 ADC input (gpio2_mode = XX); recommended
Table 101. GPIO driving cap Register This register enables low current mode for GPIOs.
1 Iout /4
Table 100. GPIO control This register controls GPIO and GPIO1 pin functions.
8.6 LED Test
Figure 26. LED Function Testing disabled (to avoid unnecessary currents). LEDs. If this forward voltage is within the specified limits of the LEDs, the external circuitry is assumed to operate.
8.6.1 Function Testing for single LE Ds connected to the Charge Pump
Table 102. Function Testing for LEDs connected to the Charge Pump
2 Switch on the current sink for the LED to be tested
3 Measure with the ADC the voltage on CPOUT Reg 26h 95h (adc_select=CPOUT,start ADC)
4 Measure with the ADC the voltage on the switched
5 Switch off the current sink for the LED to be tested Reg 03h 00h (curr31_mode = off)
8.6.2 Function Testing for LEDs connected to the Step Up DCDC Converter
7 Do the same procedure for the next LED starting
8 Switch off the charge pump
Table 103. Function Testing for LEDs connected to the DCDC converter
1 Switch on the current sink for the LED string to be
5 Switch on the DCDC converter Reg 00h 08h
6 Wait 80ms (DCDC_FB settling time)
7 Measure the voltage on DCDC_FB (ADC) Reg 26h 96h (adc_select=DCDC_FB, start ADC;
9 Switch off the over voltage protection
12 Switch off the DCDC converter Reg 00h 00h
R2 – 0.5V (current sinks feedback voltage: VFB2).
14 Compare the calculated value against the
8.7 Analog-to-Digital Converter
Table 104. ADC Input Ranges, Compliances and Resolution Table 105. ADC Parameters
Table 106. ADC_MSB result Register 6:0 D9:D3 N/A R ADC results register.
0 Result is ready
1 Conversion is running
Table 107. ADC_LSB result Register
Table 108. ADC_control Register 7 start_conversion N/A W Writing a 1 into this bit starts one ADC conversion cycle.
- See Table Table 104 for ADC ranges and resolution.
Figure 27. ADC Circuit
8.8 Audio controlled LEDs
green, cyan, yellow, red and for high amplitudes white is used (internal lookup table if audio_color=000b).
Figure 28. Audio controlled LED internal circuit curr126_aud_on, rgbx_aud_on or curr4x_aud_on not equal zero. Table 109. Audio input Parameters
Figure 29. Audio controlled LED digital processing internal circuit These three output channels (ch1, ch2, ch3) can be routed to any of the current sources according to Figure 28. yellow, red and eventually to white (for high input amplitudes).
8.8.1 AGC
ensure no light output for low signals especially for noisy input signals). Figure 30. AGC curve A (x-axis: input amplitude, y-axis: output amplitude; actual value: gain between output to
Figure 31. AGC curve B (x-axis: input amplitude, y-axis: output amplitude; actual value: gain between output to Figure 32. AGC curve C (x-axis: input amplitude, y-axis: output amplitude; actual value: gain between output to
8.8.2 Audio Contro lled LED Registers
Table 110. Audio Control Register
Table 111. Audio input Register
000 AGC off
001 Attenuate low amplitude signals otherwise linear
010 AGC curve A; slow decay of amplitude detection
011 AGC curve A; fast deca y of amplitude detection
100 AGC curve B; slow decay of amplitude detection
101 AGC curve B; fast deca y of amplitude detection
110 AGC curve C; slow decay of amplitude detection
111 AGC curve C; fast decay of amplitude detection
Table 110. Audio Control Register (Continued)
- Its safe to keep default value
- Its safe to keep default value
Table 112. Audio output Register Table 113. CURR3x audio source
00 All other modes
Table 114. Audio Control 2
0 NA not used
Table 113. CURR3x audio source Register (Continued)
8.9 Power-On Reset
The internal reset is forced if VBAT is low or if both interface pins (CLK, DATA) are low for more than tPOR_DEB (typ. 100ms)6. Then device enters shutdown mode. For details see section Operating Modes on page 80. register contents are set to default. Access by serial interface is possible once the reset thresholds are exceeded. Figure 33. Zero Power Device Wakeup block diagram
00 CURR33
01 DCDC_FB
10 GPIO1/DLS
11 GPIO2/LIGHT
Table 115. Power On Reset Parameters Table 114. Audio Control 2 Register (Continued)
8.9.1 Reset control register
8.10 Temperature Supervision
disabled and the ov_temp flag is set. After decreasing the temperature by THYST operation is resumed. The ov_temp flag can only be reset by first writing a 1 and then a 0 to the register bit rst_ov_temp. Bit ov_temp_on = 1 activates temperature supervision (Table 118). It is recommend to leave this bit set (default state).
- Guaranteed by design - min./max. limits not production tested
Table 116. Reset and Overtemp control Register This register reads and resets the overtemperature flag. Enable Shutdown mode and serial interface reset. Table 117. Overtemperature Detection Table 118. Reset and Overtemp control Register This register reads and resets the overtemperature flag. Activates/deactivates device temperature supervision.
1 Temperature supervision is enabled
8.11 Serial Interface
Figure 34. Serial interface block diagram The clock line CLK is never held low by the AS3676 (as the AS3676 does not use clock stretching of the bus). 39340011.pdf, Version 2.1, January 2000 for standard and fast mode (no high speed mode).
8.11.1 Serial Interface Features
Table 119. Serial Interface Voltages and Timings
1.38 VBAT V
Table 118. Reset and Overtemp control Register (Continued) This register reads and resets the overtemperature flag.
8.11.2 Device Address Selection
Figure 35. Complete Serial Data Transfer Figure 36. Serial Interface Byte Write Table 120. Serial Data Transfer Byte Definitions DW Device Address for Write R 10000000b (80h).
Figure 40. Serial Interface Current Address Read be responded to with an ACKNOWLEDGE from the master.
8.12 Operating Modes
Figure 41. Startup and Operating Mode Selection
9 Register Map
Table 121. Registermap
10 External Components
Table 122. External Components List
size (coil L1, transistor Q1, diode D1).
- in 1/100 inch (unless otherwise specified)
- Specified >1µF at 20V; use up to 20V DCDC output voltage
- Results in improved efficiency compared to 10µH
Figure 42. WL-CSP30 3x2.5mm 6x5 Balls Package Drawing Figure 43. WL-CSP30 3x2.5mm 6x5 Balls Detail Dimensions
11.1 Tape & Reel Information
Figure 44. Tape & Reel Dimensions
The devices are available as the standard products shown in Table 123. Note: All products are RoHS compliant and austriamicrosystems green. Table 123. Ordering Information
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