TLC5973 Datasheet, PDF (11/34 Pages) Texas Instruments – TLC5973 3-Channel, 12-Bit, PWM Constant-Current LED Driver with Single-Wire Interface (EasySet)

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8.2 Functional Block Diagram
VCC
VCC
Shunt
Regulator
UVLO
reset
TLC5973
SBVS225B – MARCH 2013 – REVISED MAY 2014
SDI
IREF
GND
Internal
Oscillator
outen
Interface
Control
LSB
sin
sclk
0
Pulse
Generator
48-Bit Shift Register
MSB
Lower 36 Bits
47
Upper 12 Bits
Command
Decoder (3AAh)
12 MHz
reset
reset
LSB
gslat
MSB
36-Bit GS Data Latch
0
35
GS Clock
36
Counter
12
12-Bit PWM Timing Control
3
Switching Delay
3
3-Channel Constant Sink Current Driver
SDO
OUT0
OUT1
OUT2
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.
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