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| TLC5971_15 Datasheet, PDF (14/45 Pages) Texas Instruments – 12-Channel, 16-Bit, Enhanced Spectrum, PWM, RGB, LED Driver | |||
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TLC5971
SBVS146D â AUGUST 2010 â REVISED DECEMBER 2015
8 Detailed Description
www.ti.com
8.1 Overview
The TLC5971 is a 12-channel constant current sink driver. Each channel has an individually-adjustable, 65535-
step, pulse width modulation (PWM) grayscale (GS) control. Each color has a 128-step brightness control (BC).
GS data and BC data are input through a serial single-wire interface port.
The TLC5971 has a 60-mA current capability. The maximum current value of each channel is determined by the
external resistor. The TLC5971 can work without external CLK signals since it can select to use internal oscillator
or external GS clock.
The TLC5971 is integrated with a linear regulator that can be used for higher VCC power-supply voltage from 6
V to 17 V.
8.2 Functional Block Diagram
VCC
SDTI
SCKI
IREF
GND
3.3 V
REG
LSB
MSB
224-Bit Shift Register
Clock
0
Timing
Adjust
wrtena
223
6
218
Write
Command
Decode
Data
Latch
Control
LSB
intlat
reset
0
EXTCLK
1
intlat
Clock
Select
218-Bit Data Latch
2 BLANK
TMGRST
192
GS Clock
Counter
16
GSX
MSB
217
26
3
BLANK
DSPRPT
OUTTMG
Internal
Oscillator
Reference
Current
Control
16-Bit ES-PWM Timing Control
21
BCX
12
3-Grouped Switching Delay
12
12-Channel Constant Sink Current Driver
with 7-Bit, 3-Grouped BC
UVLO
reset
Thermal
Detection
VREG
SDTO
SCKO
OUTR0 OUTG0 OUTB0
OUTR3 OUTG3 OUTB3
14
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