SERIAL INTERFACE

SIN

SIN(a)

TLC5946(a)

SOUT

S

UT(b)

O

SCLK, XLAT,

BLANK,GSCLK,

MODE

SIN

TLC5946(b)

SOUT

MODE

XLAT

SIN(a)

SCLK

SOUT(b)

BLANK

GSCLK

OUT0/4/8/12

(Voltage)

OUT1/5/9/13

(Voltage)

OUT2/6/10/14

(Voltage)

OUT3/7/11/15

(Voltage)

1

1

1

1

192

384

384

DCb

MSB

DCa

LSB

DCb

MSB

GSb1

MSB

GSa1

LSB

GSb1

MSB

1

1

4096

GSa2

LSB

GSb2

MSB

SIDb2

MSB

SIDb2

MSB-1

SIDb1

MSB

SIDb1

MSB-1

SIDa1

LSB

GSb3

MSB

OFF

ON

¾

¾

¾

TLC5946

The TLC5946 has a flexible serial interface that can be connected to microcontrollers or digital signal processors

in various ways. Only three pins are needed to input data into the device. More than two TLC5946s can be

connected in series by connecting an SOUT pin from one device to the SIN pin of the next device. Cascaded two

TLC5946s are shown in Figure 30 and Figure 31. The SOUT pin can also be connected to the controller to

receive status information from the TLC5946; see the SCLK and GSCLK Frequency section.

Figure 30. Cascading Two TLC5946 Devices

Figure 31. Timing Diagram of Two Cascaded TLC5946 Devices (XHALF = High)

Copyright © 2008, Texas Instruments Incorporated

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Product Folder Link(s): TLC5946