austriamicrosystems AG is now ams AG 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 Datasheet AS3661 Programmable 9-channel LED Driver 1 General Description 2 Key Features Three independent program execution engines 9 The AS3661 is a 9-channel LED driver designed to programmable outputs with 25.5 mA full-scale produce lighting effects for mobile devices. A high- current, 8- bit current setting resolution and 12-bit efficiency charge pump enables LED driving over full Li- PWM control resolution Ion battery voltage range. The device is equipped with an internal program memory, which allows operation Adaptive charge pump with 1x and 1.5x gain without processor control. The AS3661 maintains provides up to 95% LED drive efficiency excellent efficiency over a wide operating range by Charge pump with soft start and overcurrent/short autonomously selecting the best charge pump gain circuit protection based on LED forward voltage requirements. AS3661 is able to automatically enter power-save mode when LED Built-in LED test outputs are not active, thus lowering idle current Automatic power save mode IVDD = 10 A (typ.) consumption down to 10 A (typ). Two wire, I2C-compatible, control interface The AS3661 has an I2C-compatible control interface with four pin selectable addresses. Also, the device has Flexible instruction set a flexible General Purpose Output (GPO), which can be Large SRAM program memory used as a digital control pin for other devices. INT pin Small application circuit can be used to notify processor when a lighting sequence has ended (interrupt - function). Also, the Source (high side) drivers device has a trigger input interface, which allows Minimum number of external components synchronization between multiple devices.The device requires only four small and low-cost ceramic Architecture supports color control capacitors. The AS3661 is available in a tiny WL-CSP-25 3 Applications (2.285x2.285mm) 0.4mm pitch package. The product is ideal for fun and indicator lights, LED backlighting, and programmable current source. Figure 1. AS3661 LED Driver Block Diagram / 0 12- / / 0 12- / 7 8 7 8 +, -./ -./ 2 % 3 :4 : & 4 9 1 5 9 + ( - ) * 6 9 & www.austriamicrosystems.com Revision 1.3 1 - 85 ams AG Technical content still valid < &