AS3675 AMSCO | Alldatasheet
Document overview
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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 Unit (Charge Pump, DCDC, 13 Current Sinks, ADC, LED Test, LDO, Audio Controlled Light) www.austriamicrosystems.com/AS3675 1v3 1 - 80 (ptr) Datasheet
1 General Description
The AS3675 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 AS3675 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, the RGB and white LEDs can be controlled by an audio input, LED in-circuit function test, a two wire serial inter- face, and control logic all onto a single device. Output voltages and output currents are fully programmable. The AS3675 is part of to the austriamicrosystems AS3676, AS3687/87XM and AS3689 lighting mange- ment units family. It is software compatible to AS3687/ 87XM and AS3689 and pin and software compatible to AS3676.
2 Key Features
High-Efficiency Step Up DC/DC Converter - Up to 16V/55mA (or 25V/35mA) 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 300mA/500mA pulsed - Efficiency up to 95% - Very Low effective Resistance (2.5Ω 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 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: GPIO, all current sources, VBAT, CPOUT, DCDC_FB - Internal Temp. Measurement - Light Sensor input Support for automatic LED testing (open and shorted LEDs can be identified) Support for external Temperature Sensor for high current LED protection (CURR3x) Strobe Timeout protection - Up to 1600ms - Three different timing modes Two General Purpose Inputs/Output - VANA/GPI Input, GPIO Input/Output - Digital Input, Digital Output using VANA/GPI sup- ply and Tristate - VANA/GPI internal pull down - GPIO Programmable Pull-Up/Down Programmable LDO - 1.85 to 3.4V, 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 or up to four white LEDs - RGB Color and Brightness is dependent on audio input amplitude or frequency White LEDs can be controlled by amplitude or fre- quency (different modes like bar-type or two and two LEDs driven by frequency filters) 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. Block Diagram
4 Pinout
Table 1. Pin Description for AS3675 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. Do not load this pin during device startup.
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. Current Sink CURR1 Protection Current Figure 7. Current Sink CURR3x vs. VBAT
8 Detailed Description
8.1 Analog LDO
mance 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 11. Analog LDO Block Diagram Table 5. Electrical Characteristics
8.1.1 LDO Registers
- Not production tested – guaranteed by design and laboratory verification
- During startup of the LDO the current limit is half the value of ILIMIT
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
0 Normal Operation
Table 7. LDO ANA1 Voltage Register This register sets the output voltage (VANA) 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/35mA or e.g. 16V/55mA. A constant switching-frequency results in a low noise on the supply and output voltages. Figure 12. Step Up DCDC Converter Block Diagram Option: Current Feedback with Over voltage protection Table 8. Step Up DC/DC Converter Parameters For constant voltage control. on CURR1, CURR2 or CURR6 in regulation.
converter. The total startup time for an output voltage of e.g. 25V is less than 2ms.
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
abled to avoid too high voltages on the output of the DCDC converter. If the over voltage protection is not used in current feedback mode, connect DCDC_FB to ground.
Figure 13. Step Up DC/DC Converter Detail Diagram; Option: Regulated Output Current, Feedback is
8.2.3 Voltage Feedback
Setting bit step_up_fb (see page 15) = 00 enables voltage feedback at pin DCDC_FB.
8.2.4 PCB Layout Hints
AS3675 VSS. This ensures that local high-frequency currents will not flow to the battery.
8.2.5 Step up Registers
Table 9. Voltage Feedback Example Values 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. Table 12. DCDC control2
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
8.3 Charge Pump
- battery current = output current.
- battery current = 1.5 times output current.
current sink and on the Charge Pump switch. Efficiency 95%. current sink and 250mV on the Charge Pump. Efficiency 66%. 600mV drop on the current sink and 2.5V on the Charge Pump. Efficiency 60%.
3 Step up_lowcur 1R / W
0 Normal current limit
pump (currX_on_cp must be 0). Table 12. DCDC control2 Register
Figure 14. Charge Pump Pin Connections Note: The connections of the external capacitors C2, C3, C4 and C5 should be kept as short as possible. The maximum voltage on the flying capacitors C3 and C4 is VBAT. Table 13. Charge Pump External Components Table 14. Charge Pump Characteristics
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.
Figure 15. 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 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. Table 21. Current Sink Function Overview
8.4.1 High Voltage Current Sinks CURR1, CURR2, CURR6
Table 22. HV Current Sinks Characteristics 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
8.4.2 Current Sinks CURR30, CURR31, CURR32, CURR33
vidually with curr30_current – curr33_current or common with curr3x_strobe or curr3x_preview. Table 27. curr rgb control Register This register select the mode of the current sinks CURR6. Table 28. DCDC control2 Register Table 29. Current Sinks CURR30,31,32,33 Parameters
0.2 CPO
Table 30. Curr3 control2 Register This register selects the modes of the current sinks30..33 current.
1 CURR30 is strobe input; CURR1, CURR2,
Table 31. Curr3 strobe control Register This register selects the modes of the current sinks30..33 current.
Table 32. Curr3x strobe Register Table 33. Curr3x preview Register Table 31. Curr3 strobe control This register selects the modes of the current sinks30..33 current.
Table 34. Curr3x other Register Table 35. Curr30 current Register Table 36. Curr31 current Table 37. Curr32 current
Table 38. Curr33 current Register Table 39. curr3 control1 Register
8.4.3 Current Sinks RGB1, RGB2, RGB3
These current sinks have a resolution of 8 bits and can sink up to 38.25mA. Table 40. Pattern control Register Table 41. Current Sinks RGB1, RGB2, RGB3 Parameters
Table 42. curr rgb control Register Table 43. Rgb1 current Register This register controls the RGB current sink current. Table 44. Rgb2 current This register controls the RGB current sink current.
8.4.4 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. Rgb3 current Register This register controls the RGB current sink current. Table 46. CURR4x Sinks Characteristics Table 47. curr4 control Register
Table 48. Curr41 current Register This register controls the curr41 current sink current. Table 49. Curr42 current Register This register controls the curr42 current sink current. Table 47. curr4 control
8.4.5 LED Pattern Generator
each bit). The pattern itself can be started every second, every 2nd, 3rd up to 7th second1. 0 and their programmed current. on the pattern (set register cp_auto_on on page 20=1) to reduce the overall current consumption. Figure 16. LED Pattern Generator AS3675 for pattern_color = 0 description of the different current sinks. Figure 17. LED Pattern Generator AS3675 for pattern_color = 1 Table 50. 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)
Figure 20. Soft dimming example Waveform for CURR30-32 Table 51. 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 52. Pattern control Register
- If softdim_pattern=1, don’t set curr30_mode, curr31_mode, curr32_mode or curr33_mode to 11b.
0 Pattern generator directly control current
Table 53. gpio current Register
8.4.6 PWM Generator
Table 54. Pattern End Register
- pattern_end toggles whenever the AS3675 is in active mode (see Section 8.12 Operating Modes on page 71)
even if no pattern data has been setup. Table 55. LED Pattern timing
- Even by setting 000 for pattern delay, there is a small delay before the new patterns starts.
Table 53. gpio current
Figure 23. PWM Control Circuit (currX_mode = 10b (PWM controlled)); X = any current sink ming is defined by 0 + currX_adder and the end current is defined by currX_current + currX_adder. 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 56. PWM Dimming Table
Table 57. Pwm control Register 01b logarithmic up dimming (codes are increased). Table 58. pwm code Register This register controls the Pwm code.
Table 59. Adder Current 1 Register Table 60. Adder Current 2 Register Table 61. Adder Current 3 Register Table 62. Adder Current 4 Register
Table 63. Adder Enable 1 Register
0 Normal Operation of the current source
Table 64. Adder Enable 2
Table 65. Subtract Enable
0 Direct Operation (no inversion)
Table 64. Adder Enable 2 Register (Continued)
8.5 General Purpo se Input / Output
Figure 24. GPIO and VANA/GPI Blockdiagram
8.5.1 Unused GPIO Pin
Table 66. GPIO Pin Function Summary Table 65. Subtract Enable Register (Continued)
8.5.2 GPIO Characteristics
8.5.3 GPIO Registers
Table 67. GPIO DC Characteristics Table 68. GPIO output 1 Register This register controls GPIO outputs.
Table 69. GPIO signal 1 Register This register controls GPIO outputs.
3 N/A not used
Table 70. GPIO output 2 This register controls GPIO outputs. other bit setting e.g., gpio_mode Table 72. Table 68. GPIO output 1 Register (Continued) This register controls GPIO outputs.
Table 71. GPIO signal 2 Register This register controls GPIO outputs. Table 72. 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
This register controls GPIO outputs.
00 None
01 Pulldown
10 Pullup
11 ADC input (gpio_mode = XX); recommended for
Table 73. GPIO driving cap Register This register enables low current mode for GPIOs.
1 Iout /4
Table 72. GPIO control This register controls GPIO and GPIO1 pin functions.
8.6 LED Test
Figure 25. 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 74. 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 75. 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 76. ADC Input Ranges, Compliances and Resolution Table 77. ADC Parameters
Table 78. ADC_MSB result Register 6:0 D9:D3 N/A R ADC results register.
0 Result is ready
1 Conversion is running
Table 79. ADC_LSB result Register
Table 80. ADC_control Register 7 start_conversion N/A W Writing a 1 into this bit starts one ADC conversion cycle.
- See Table Table 76 for ADC ranges and resultion.
Figure 26. ADC Circuit
8.8 Audio controlled LEDs
white is used (internal lookup table if audio_color=000b). filter, bandpass filter, highpass filter).
Figure 27. Audio controlled LED internal circuit curr126_aud_on, rgbx_aud_on or curr4x_aud_on not equal zero. Table 81. Audio input Parameters
Figure 28. 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 27.
8.8.1 Amplitude Mode
This mode is selected by freq_mode=0. yellow, red and eventually to white (for high input amplitudes).
8.8.2 Frequency Mode
This mode is selected by freq_mode=1. Figure 29. Audio controlled LED frequency filter amicrosystems ‘Demoboard Software’ for simple control of the filter cutoff frequencies and filter type. Note: Do not set filter cutoff frequencies below 500Hz.
8.8.3 AGC
input amplitude signals (this is performed to ensure no light output for low signals especially for noisy input signals).
8.8.4 Audio Contro lled LED Registers
Table 82. Audio Control Register Table 83. 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
- Its safe to keep default value
- Its safe to keep default value
Table 84. Audio output Register Table 83. Audio input Register (Continued)
Table 85. CURR3x audio source Register
00 All other modes
Table 84. Audio output Register (Continued)
Table 86. filt_type Table 85. CURR3x audio source
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)2. Then device enters shutdown mode. register contents are set to default. Access by serial interface is possible once the reset thresholds are exceeded. Table 87. Filter Definitions Register
Figure 33. Zero Power Device Wakeup block diagram
8.9.1 Reset control register
8.10 Temperature Supervision
Table 88. Audio input Parameters
- Guaranteed by design - min./max. limits not production tested
Table 89. Overtemp control Register This register reads and resets the overtemperature flag. Enable Shutdown mode and serial interface reset.
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 91. It is recommend to leave this bit set (default state).
8.11 Serial Interface
Figure 34. Serial interface block diagram Table 90. Overtemperature Detection Table 91. Overtemp control Register This register reads and resets the overtemperature flag. Activates/deactivates device temperature supervision.
1 Temperature supervision is enabled
The clock line CLK is never held low by the AS3675 (as the AS3675 does not use clock stretching of the bus).
8.11.1 Serial Interface Features
8.11.2 Device Address Selection
Figure 35. Complete Serial Data Transfer Table 92. Serial Interface Timing
1.38 VBAT V
direction after the data transfer from the master. condition is followed by the device-write address and the word address. responds to the data byte with a NOT ACKNOWLEDGE, and issues a STOP condition on the bus. Figure 39. Serial Interface Sequential Read Sequential Read is the extended form of Random Read, as multiple register-data bytes are subsequently transferred. last data byte and subsequently generate the STOP condition. Figure 40. Serial Interface Current Address Read be responded to with an ACKNOWLEDGE from the master.
8.12 Operating Modes
sumption is minimized (IBAT = ISHUTDOWN) and all internal registers are reset to their default values.
www.austriamicrosystems.com/AS3675 1v3 72 - 80 AS3675 Datasheet - Detailed Description If all these blocks are disabled, a write instruction to enable these blocks is delayed by 64 CLK cycles (oscillator will startup, within max 200µs). ams AG Technical content still valid
9 Register Map
Table 94. Registermap
10 External Components
Table 95. External Components List
Figure 41. WL-CSP30 3x2.5mm 6x5 Balls Package Drawing Figure 42. WL-CSP30 3x2.5mm 6x5 Balls Detail Dimensions
11.1 Tape & Reel Information
Figure 43. Tape & Reel Dimensions
The devices are available as the standard products shown in Table 96. Table 96. Ordering Information
www.austriamicrosystems.com/AS3675 1v3 80 - 80 AS3675 Datasheet - Ordering Information Copyrights Copyright © 1997-2010, austriamicrosystems AG, Tobelbaderstrasse 30, 8141 Unterpremstaetten, Austria-Europe. Trademarks 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, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. austriami- crosystems AG reserves the right to change specifications and prices at any time and without 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. Applications 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, austriami- crosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or conse- quential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical 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. Contact Information Headquarters austriamicrosystems AG Tobelbaderstrasse 30 Schloss Premstätten A-8141 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/contact ams AG Technical content still valid