TLC5946_17 Datasheet, PDF (21/41 Pages) Texas Instruments – 16-Channel, 12-Bit PWM LED Driver with 6-Bit Dot Correction

TLC5946
www.ti.com .......................................................................................................................................................... SLVS824B – MARCH 2008 – REVISED JUNE 2008
SERIAL INTERFACE
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.
TLC5946 (a)
TLC5946 (b)
SIN(a)
SIN
SOUT
SIN
SOUT
SOUT(b)
SCLK, XLAT,
BLANK, GSCLK,
MODE
Figure 30. Cascading Two TLC5946 Devices
MODE
XLAT
SIN(a) ^DCb
DCa
MSB
LSB
GSb1
MSB
SCLK
1
SOUT(b)
192
DCb
¾
MSB
1
¾
¾
GSa1
LSB
384
GSb1
MSB
GSb2
MSB
1
SIDb1 SIDb1
MSB MSB-1
GSa2
LSB
384
SIDa1
LSB
GSb3
MSB
1
SIDb2 SIDb2
MSB MSB-1
BLANK
GSCLK
1
1
4096
OUT0/4/8/12
(Voltage)
OUT1/5/9/13
(Voltage)
OFF
ON
OUT2/6/10/14
(Voltage)
OUT3/7/11/15
(Voltage)
Figure 31. Timing Diagram of Two Cascaded TLC5946 Devices (XHALF = High)
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