Command

Decoder (3AAh)

Interface

Control

12

3

Upper 12 Bits

SDO

GND

48-Bit Shift Register

36-Bit GS Data Latch

GS Clock

Counter

3-Channel Constant Sink Current Driver

Switching Delay

LSB

MSB

0

47

LSB

MSB

0

35

VCC

SDI

36

OUT2

UVLO

Shunt

Regulator

reset

Internal

Oscillator

12-Bit PWM Timing Control

OUT0

OUT1

VCC

sin

sclk

12 MHz

3

Lower 36 Bits

IREF

reset

Pulse

Generator

reset

gslat

outen

TLC5973

www.ti.com

SBVS225B – MARCH 2013 – REVISED MAY 2014

8.2 Functional Block Diagram

8.3 Feature Description

8.3.1 Grayscale (GS) Control

This control feature is a 12-bit (4096-step) grayscale (GS) control that provides a wide range of color generation.

68 billion colors can be generated with the red, green, and blue LEDs. Connect the LEDs to the device OUTn

pins, as described in the Applications and Implementation section.

8.3.2 EasySet and Shunt Regulator

This device includes a single-wire serial interface (EasySet) and a shunt regulator. The total number of wires for

power supply and data write operations can be reduced with the EasySet and shunt regulator included in the

design.

Copyright © 2013–2014, Texas Instruments Incorporated

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