TLC59291_16 Datasheet, PDF (24/46 Pages) Texas Instruments – 8/16-Channel, Constant Current LED Driver

TLC59291
SLVSA96A – SEPTEMBER 2015 – REVISED MARCH 2016
8 Detailed Description
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8.1 Overview
The TLC59291 is a 8/16-channel constant current sink LED driver. Each channel can be turned on-off by writing
data to an internal register. The constant current value of all 16 channels is set by a single external resistor and
128 steps for the global brightness control (BC).
The TLC59291 has six type error flags: LED open detection (LOD), LED short detection (LSD), output leak
detection (OLD), reference terminal short detection (ISF), Pre thermal warning (PTW) and thermal error flag
(TEF). In addition, the LOD and LSD functions have invisible detection mode (IDM) that can detect those errors
even when the output is off. The error detection results can be read via a serial interface port.
8.2 Functional Block Diagram
VCC
SIN
SCLK
LAT
BLANK
IREF
GND
VCC
UVLO ^RESET
LSB
0
LSB
16 bit LOD or 16 bit LSD data or 16 bit OLD data
Common shift register
16
Output On-Off data Latch
MSB
LOAD
SELECT
15
2
MSB
All off
16
Bit 7/15
Select
1
Power
save
control
Thermal
Detector
0
15
LSB
16
Control data latch
MSB ₁₆
(Global brightness control, LSD voltage select,
loaded error select, other function control)
0
3
4 ¹⁵
To all ⁷
analog
circuit
OSC
BC
165C
138C
2
2
IDM timing
control
ERROR
2 _SELECT
RESET
1
Blank
Mode
SID
Selector
Temp
Error
ISF
Status
16
2
Reference ^ISF
current
control
On-Off control with output delay
16
16channels constant current sink driver
with 7bit global brightness control
SID
Holder
16
VLSD
SELECT
ERROR
SELECT
Detection
Voltage
LED Open Detection (LOD) / LED Short Detection (LSD)
/Output Leak Detection (OLD)
GND
SOUT
OUT0 OUT1 OUT2
OUT13 OUT14 OUT15
24
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