AL5822112-CHANNEL RGB LED DRIVERDescriptionPin Assignments The AL58221 is a 12-channel (R/G/B x 4), constant-current, Adaptive Pulse Density Modulation (APDM) LED driver which operates over a (3D Photo – Not to Scale) 3V~5.5V input voltage range. The device provides 12 open-drain constant-current sinking outputs that are rated to 24V and delivers up to 60mA of high-accuracy current to each string of LED. Each channel’s average output current can be individually programmable through a digital interface. The current at each output is set by three external current-setting resistors. The AL58221 features a 10MHz double-edge trigger data clock input to reduce EMI. It offers a 2-wire serial interface to send grayscale (3D Step file available upon request) data, control commands including 16/14/12/8-bit grayscale selection, grayscale clock frequency division selection, output polarity selection for high-power LED driving, output Trise and Tfall timing selection, (Top View – Not to Scale) current output waveform selection, and internal-latch function.
The device provides an adaptive pulse density modulation method to REXT_C 1 24 GND increase the visual refresh rate up to 1000 Hz @ 16-bit grayscale. It REXT_B 2 23 VDD reduces flickers and provides output current bilateral processing for EMI reduction. REXT_A 3 22 NC OUTC[0] 4 21 OUTA[3] The AL58221 utilizes a clock duty recovery technique and pulse re- OUTB[0] 5 20 OUTB[3] AL58221 timing to support longer distance connection and multiple devices’ OUTA[0] 6 Thermal 19 OUTC[3] cascading applications. It also provides typical ±1% channel-to- Exposed OUTC[1] 7 18 OUTA[2] channel LED current accuracy. Additional features include a ±0.1% Pad regulated output current capability and fast output transient response. OUTB[1] 8 17 OUTB[2] OUTA[1] 9 16 OUTC[2] The AL58221 is available in the TSSOP-24EP (Type A1-B) package GCKI 10 15 GCKO and is specified over the -40°C to +85°C ambient temperature range. DCKI 11 14 DO DCKO 12 13 DI Features • TSSOP - 24EP (Type A1-B) Input Voltage VDD: 3V to 5.5V •