TLC5947 Datasheet, PDF (7/27 Pages) Texas Instruments – 24-Channel, 12-Bit PWM LED Driver with

TLC5947
www.ti.com ................................................................................................................................................. SBVS114A – JULY 2008 – REVISED SEPTEMBER 2008
TERMINAL
NAME
DAP
SIN
4
RHB
32
SCLK
3
31
XLAT
30
26
BLANK
2
30
IREF
31
27
SOUT
29
25
OUT0
5
1
OUT1
6
2
OUT2
7
3
OUT3
8
4
OUT4
9
5
OUT5
10
6
OUT6
11
7
OUT7
12
8
OUT8
13
9
OUT9
14
10
OUT10
15
11
OUT11
16
12
OUT12
17
13
OUT13
18
14
OUT14
19
15
OUT15
20
16
OUT16
21
17
OUT17
22
18
OUT18
23
19
OUT19
24
20
OUT20
25
21
OUT21
26
22
OUT22
27
23
OUT23
28
24
VCC
32
28
GND
1
29
TERMINAL FUNCTIONS
I/O
DESCRIPTION
I Serial input for grayscale data
Serial data shift clock. Schmitt buffer input. Data present on the SIN pin are shifted into the shift
I
register with the rising edge of the SCLK pin. Data are shifted to the MSB side by 1-bit
synchronizing of the rising edge of SCLK. The MSB data appears on SOUT at the falling edge of
SCLK. A rising edge on the SCLK input is allowed 100 ns after an XLAT rising edge.
The data in the grayscale shift register are moved to the grayscale data latch with a low-to-high
I
transition on this pin. When the XLAT rising edge is input, all constant current outputs are forced
off until the next grayscale display period. The grayscale counter is not reset to zero with a rising
edge of XLAT.
Blank (all constant current outputs off). When BLANK is high, all constant current outputs (OUT0
I
through OUT23) are forced off, the grayscale PWM timing controller initializes, and the grayscale
counter resets to '0'. When BLANK is low, all constant current outputs are controlled by the
grayscale PWM timing controller.
I/O
This pin sets the constant current value. OUT0 through OUT23 constant sink current is set to the
desired value by connecting an external resistor between IREF and GND.
Serial data output. This output is connected to the shift register placed after the MSB of the
O
grayscale shift register. Therefore, the MSB data of the grayscale shift register appears at the
falling edge of SCLK. This function reduces the data shifting errors caused by small timing
margins between SIN and SCLK.
O
Constant current output. Multiple outputs can be tied together to increase the constant current
capability. Different voltages can be applied to each output.
O Constant current output
O Constant current output
O Constant current output
O Constant current output
O Constant current output
O Constant current output
O Constant current output
O Constant current output
O Constant current output
O Constant current output
O Constant current output
O Constant current output
O Constant current output
O Constant current output
O Constant current output
O Constant current output
O Constant current output
O Constant current output
O Constant current output
O Constant current output
O Constant current output
O Constant current output
O Constant current output
— Power-supply voltage
— Power ground
Copyright © 2008, Texas Instruments Incorporated
Product Folder Link(s): TLC5947
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