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The TLC5940 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. The dot correction data is stored in an integrated EEPROM. Both grayscale control and dot correction are accessible through a serial interface. A single external resistor sets the maximum current value of all 16 channels.
The TLC5940 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.
* 16 Channels * 12 bit (4096 Steps) Grayscale PWM Control * Dot Correction – 6 bit (64 Steps) – Storable in Integrated EEPROM drivers * Drive Capability (Constant-Current Sink) – 0 mA to 60 mA (VCC < 3.6 V) – 0 mA to 120 mA (VCC > 3.6 V) * LED Power Supply Voltage up to 17 V * VCC = 3 V to 5.5 V * Serial Data Interface * Controlled In-Rush Current * 30 MHz Data Transfer Rate * CMOS Level I/O * Error Information – LOD: LED Open Detection – TEF: Thermal Error Flag