TLC5921

LED DRIVER

SLLS390 – SEPTEMBER 1999

4

POST OFFICE BOX 655303

Terminal Functions

TERMINAL

I/O

DESCRIPTION

NAME

NO.

I/O

DESCRIPTION

SIN

5

I

1 bit serial data input

SOUT

28

O

1 bit serial data output

SCLK

4

I

Clock input for data transfer. All the data in the shift register is shifted to MSB by 1 bit

synchronizing to the rising edge of SCLK, and data at SIN is shifted to LSB at the same time.

(Schmitt buffer input)

XLAT

3

I

Latch. When XLAT is high, data on shift register goes through latch. When XLAT is low, data

is latched. Accordingly, if data on shift register is changed during XLAT high, this new value

is latched (level latch). This terminal is internally pulled down with 100k

Ω.

SOMODE

30

I

Timing select for serial data output. When SOMODE is low, output data on SOUT is changed

synchronizing to the rising edge of SCLK. When SOMODE is high, output data on SOUT

is changed synchronizing to the falling edge of SCLK.

OUT0 – OUT15

7,8,10,11,12,13,

15,16,17,18,20,

21,22,23,25,26

O

Constant current output.

BLANK

2

I

Blank(Light off). When BLANK is high, all the output of constant current driver is turned off.

When BLANK is low and data written to latch is 1, the corresponding constant current output

turns on (LED on). This terminal is internally pulled up with 100k

Ω.

IREF

31

I

Constant current value setting. LED current is set to desired value by connecting external

resistor between IREF and GND. The 38 times current compared to current across external

resistor sink on output terminal.

XDOWN

29

O

Error output. XDOWN is configured as open collector. It goes low when TSD or LOD

functions.

VCC

32

Power supply voltage

GND

1

Ground

PGND

6,9,14,19,24,27

Ground for LED driver. (Internally connected to GND)

THERMAL PAD

package bottom

Heat sink pad. This pad is connected to the lowest potential to IC or thermal layer.

– 0.3 V to 7 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

90 mA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

– 0.3 V to 18 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–40

°C to 150°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.9 W

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

31.4 mW/

°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and

functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTE 1: All voltage values are with respect to GND terminal.