TLC5943_17 Datasheet, PDF (8/40 Pages) Texas Instruments – 16-Channel, 16-Bit PWM LED Driver with 7-Bit Global Brightness Control

TLC5943
SBVS101 – DECEMBER 2007
TERMINAL
NAME
PWP
SIN
5
RHB
2
SCLK
4
1
XLAT
BCSEL
GSCLK
BLANK
IREF
SOUT
XERR
OUT0
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
OUT8
OUT9
OUT10
OUT11
OUT12
OUT13
OUT14
OUT15
VCC
GND
XTEST
NC
3
32
6
3
25
24
2
31
27
26
24
23
23
22
7
4
8
5
9
6
10
7
11
8
12
9
13
10
14
11
15
14
16
15
17
16
18
17
19
18
20
19
21
20
22
21
28
27
1
30
26
25
—
12, 13,
28, 29
TERMINAL FUNCTIONS
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I/O
DESCRIPTION
I Serial data input for grayscale and brightness control data. Schmitt buffer input.
Serial data shift clock for GS shift register and BC shift register. Schmitt buffer input. The shift
register is selected by BCSEL. Data present on the SIN pin are shifted into the shift register
I selected by BCSEL with the rising edge of the SCLK pin. Data in the selected shift register are
shifted to the MSB side by 1-bit synchronizing to the rising edge of SCLK. The MSB data of the
selected register appears on SOUT.
I
Data in the Grayscale and Brightness shift register are moved to the respective first data latch
with a low-to-high transition of this pin.
Shift register and data latch select. Schmitt buffer input. When BCSEL is low, Grayscale shift
I register and first data latch are selected. When BCSEL is high, Brightness Control shift register
and first data latch are selected. BCSEL should not be changed while SCLK is high.
I
Reference clock for Grayscale PWM control. Schmitt buffer input. If BLANK is low, then each
rising edge of GSCLK increments the grayscale counter for PWM control.
Blank (all constant current outputs off). Schmitt buffer input. When BLANK is high, all constant
I
current outputs (OUT0 through OUT15) are forced off, the Grayscale counter is reset to '0', and
the Grayscale PWM timing controller is initialized. When BLANK is low, all constant current
outputs are controlled by the Grayscale PWM timing controller.
I/O
Constant current value setting. OUT0 through OUT15 sink constant current is set to desired
value by connecting an external resistor between IREF and GND.
O
Serial data output. This output is connected to Grayscale/Status Information shift register or
Brightness Control shift register. The connected register is selected by BCSEL.
O Error output. Open-drain output. XERR goes low when LOD or TEF is detected.
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
I Factory test pin. XTEST must be connected to VCC or GND.
— No internal connection
8
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