RTQ

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Thermal

PAD

(Solder side)

(GND terminal)

15 16

17 18 19

20 21 22

52 51 50 49

42

41

40

39

38

37

56

55 54 53

1

2

3

4

5

6

7

8

SOUT

OUTB9

OUTG9

OUTR9

OUTB8

OUTG8

OUTR8

OUTB7

OUTG7

OUTR7

OUTB6

OUTG6

OUTR6

GCLK

IREF

OUTR14

OUTG14

OUTB14

OUTR15

OUTG15

OUTB15

OUTR0

OUTG0

OUTB0

OUTR1

OUTG1

OUTB1

OUTR2

36

35

34

33

32

31

30

29

9

10

11

12

13

14

23 24 25 26

27 28

48 47

46 45 44 43

TLC5958

www.ti.com

SLVSCE7A – MAY 2014 – REVISED SEPTEMBER 2014

6 Description (Continued)

The TLC5958 has one error flag: LED open detection (LOD), which can be read via a serial interface port. The

TLC5958 also has a power-save mode that sets the total current consumption to 0.8mA (typ) when all outputs

are off.

7 Pin Configuration and Functions

56 Pin

Pin Functions

PIN

I/O

DESCRIPTION

NAME

NO.

Grayscale(GS) pulse width modulation (PWM) reference clock control for OUTXn.

GCLK

29

I

Each GCLK rising edge increase the GS counter by1 for PWM control.

GND

ThermalPad

–

Power ground. The thermal pad must be soldered to GND on PCB.

Maximum constant-current value setting. The OUTR0 to OUTB15 maximum constant output

current are set to the desired values by connecting an external resistor between IREF and

IREF

1

–

IREFGND. See equation 1 for more detail. The external resistor should be placed close to

the device.

Analog ground. Dedicated ground pin for the external IREF resistor. This pin should be

IREFGND

56

–

connected to analog ground trace which is connected to power ground near the common

GND point of board.

The LAT falling edge latches the data from the common shift register into the GS data

LAT

27

I

memory or Function control(FC) register FC1 or FC2.

8, 11, 14, 17,

20, 23, 30,

Constant current output for RED LED. Multiple outputs can be tied together to increase the

OUTR0-R15

33, 36, 39,

O

constant current capability. Different voltages can be applied to each output. These outputs

44, 47, 50,

are turned on-off by GCLK signal and the data in GS data memory.

53 ,2, 5

Copyright © 2014, Texas Instruments Incorporated

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