TLC5945

www.ti.com PWP RHB TLC5945 SLVS755 – MARCH 2007 16-CHANNEL LED DRIVER WITH DOT CORRECTION AND GRAYSCALE PWM CONTROL FEATURES 16 Channels 12-bit (4096 Steps) Grayscale PWM Control Dot Correction – 6 bit (64 Steps) Drive Capability (Constant-Current Sink) – 0 mA to 80 mA LED Power Supply Voltage up to 17 V VCC = 3.0 V to 5.5 V Serial Data Interface 30-MHz Data Transfer Rate CMOS Level I/O Error Information – LOD: LED Open Detection – TEF: Thermal Error Flag APPLICATIONS Monocolor, Multicolor, Full-Color LED Displays LED Signboards Display Back-lighting DESCRIPTION The TLC5945 is a 16-channel, constant-current sink, LED driver. Each channel has an individually adjustable 4096-step grayscale PWM brightness control and a 64-step constant-current sink (dot correction). The dot correction adjusts the brightness variations between LED channels and other LED drivers. Both grayscale control and dot correction are accessible via a serial interface. A single external resistor sets the maximum current value of all 16 channels. The TLC5945 features two error information circuits. The LED open detection (LOD) indicates a broken or disconnected LED at an output terminal. The thermal error flag (TEF) indicates an overtemperature condition. VCC GND SCLK SIN XLAT IREF Max. OUTn VREF Current =1.24V GSCLK BLANK GS Counter CNT 0 Status Information: LOD, TED, DC DATA 191 96 192 96 MODE 10 0 MODE 10 GS Register 11 0 DC Register 50 Input Shift Register...