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AS3687XM

Part Number	AS3687XM
Manufacturer	austriamicrosystems
Description	Flexible Lighting Management
Published	Feb 18, 2015
Detailed Description	AS3687/87XM DDaatatsahseeht eet AS3687/87XM Flexible Lighting Management (Charge Pump, DCDC Step Up, Seven Current Sinks...
Datasheet	AS3687XM PDF File

Overview

AS3687/87XM DDaatatsahseeht eet AS3687/87XM Flexible Lighting Management (Charge Pump, DCDC Step Up, Seven Current Sinks, ADC, LED Test, Audio Light) Technical coantmesntAsGtill valid 1 General Description The AS3687/87XM is a highly-integrated CMOS Lighting Management Unit for mobile telephones, and other 1-cell Li+ or 3-cell NiMH powered devices.
The AS3687/87XM incorporates one Step Up DC/DC Converter for white backlight LEDs, one low noise Charge Pump for indicator- or RGB- LEDs, LED test circuit (production test of the soldered LEDs at the customer site), one Analog-to-Digital Converter, seven current sinks, a two wire serial interface, and control logic all onto a single device.
Output voltages and output currents are fully programmable.
The AS3687XM has an audio input to control one or two RGB LEDs.
The AS3687/87XM is a successor to the austrimicrosystems AS3689 and therefore software compatible to the AS3689 (software written for the AS3689 can be easily reused for the AS3687/87XM).
2 Key Features High-Efficiency Step Up DC/DC Converter − Up to 25V/50mA for White LEDs − Programmable Output Voltage with External Resistors and Serial Interface − Overvoltage Protection High-Efficiency Low Noise 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 150mA − Efficiency up to 95% − Only 4 External Capacitors Required: 2 x 500nF Flying Capacitors, 2 x 1µF Input/Output Capacitors − Supports LCD White Backlight or RGB LEDs Seven Current Sinks − All seven current sinks fully Programmable (8-bit) from: 0.
15mA to 38.
5mA (CURR1, CURR2, CURR6, CURR30, CURR31, CURR32, CURR33) − Three current sinks are High Voltage capable (CURR1, CURR2, CURR6) − 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 Approximatio...

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