TLC5928

TERMINAL FUNCTIONS

TERMINAL

DBQ/PW/

NAME

PWP

RGE

I/O

DESCRIPTION

Serial data input for driver on/off control. When SIN = high level, data '1' are written into LSB

SIN

2

23

I

of the on/off control shift register at the rising edge of SCLK.

Serial data shift clock. Schmitt buffer input. All data in the on/off control shift register are

SCLK

3

24

I

shifted toward the MSB by 1-bit synchronization of SCLK. A rising edge on SCLK is allowed

100 ns after a rising edge of LAT.

Edge triggered latch. The data in the on/off control data shift register are transferred to the

on/off control data latch at this rising edge. At the same time, the data in the on/off control shift

LAT

4

1

I

register are replaced with LED open detection (LOD) and pre-thermal warning (PTW) data.

LAT must be toggled only once after the shift data are updated to avoid the on/off control latch

data being replaced with LOD and PTW data in the shift register.

Blank, all outputs. When BLANK = high level, all constant current outputs (OUT0–OUT15) are

forced off. When BLANK = low level, all constant current outputs are controlled by the on/off

BLANK

21

18

I

control data in the data latch. LOD and PTW data are latched into the SID data latch at the

rising edge of BLANK and are present at the output of the SID data latch when BLANK is low.

Constant current value setting, OUT0–OUT15 sink constant current is set to desired value by

IREF

23

20

I/O

connection to an external resistor between IREF and GND.

Serial data output. This output is connected to the MSB of the on/off data shift register. SOUT

SOUT

22

19

O

data changes at the rising edge of SCLK.

Constant current output. Each output can be tied together with others to increase the constant

OUT0

5

2

O

current. Different voltages can be applied to each output.

OUT1

6

3

O

Constant current output

OUT2

7

4

O

Constant current output

OUT3

8

5

O

Constant current output

OUT4

9

6

O

Constant current output

OUT5

10

7

O

Constant current output

OUT6

11

8

O

Constant current output

OUT7

12

9

O

Constant current output

OUT8

13

10

O

Constant current output

OUT9

14

11

O

Constant current output

OUT10

15

12

O

Constant current output

OUT11

16

13

O

Constant current output

OUT12

17

14

O

Constant current output

OUT13

18

15

O

Constant current output

OUT14

19

16

O

Constant current output

OUT15

20

17

O

Constant current output

VCC

24

21

—

Power-supply voltage

GND

1

22

—

Power ground

Copyright © 2008, Texas Instruments Incorporated

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