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TLC5945 Datasheet(PDF) 11 Page - Texas Instruments

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Part No. TLC5945
Description  16-CHANNEL LED DRIVER WITH DOT CORRECTION AND GRAYSCALE PWM CONTROL
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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TLC5945 Datasheet(HTML) 11 Page - Texas Instruments

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PRINCIPLES OF OPERATION
SERIAL INTERFACE
MODE
XLAT
SIN
SCLK
SOUT
BLANK
GSCLK
OUT0
(current)
OUT1
(current)
OUT15
(current)
XERR
1
96
DC
MSB
DC
LSB
DC
MSB
1
192
193
1
192
193
1
1
4096
tsu4
th4
twh3
1
GS1
MSB
GS1
LSB
GS1
MSB
GS2
MSB
GS2
LSB
GS2
MSB
SID2
MSB
SID2
MSB-1
SID1
MSB
SID1
MSB-1
SID1
LSB
GS3
MSB
-
-
-
twh2
tsu2
tsu1
twh0
twl0
tsu0
th0
tpd0
tpd1
tpd3
tpd2
tpd3
tpd3
tpd4
twl1
twh1
DCDataInputMode
GSDataInputMode
1stGSDataInputCycle
2ndGSDataInputCycle
1stGSDataOutputCycle
2ndGSDataOutputCycle
tsu3
th3
th2
th1
tsu5
Tgsclk
touton
SIN
SOUT
SIN(a)
SOUT(b )
TLC5945(a)
GSCLK,
BLANK,
SIN
SOUT
TLC5945(b)
SCLK,XLAT,
MODE
TLC5945
SLVS755 – MARCH 2007
The TLC5945 has a flexible serial interface, which can be connected to microcontrollers or digital signal
processors in various ways. Only 3 pins are needed to input data into the device. The rising edge of SCLK
signal shifts the data from the SIN pin to the internal register. After all data is clocked in, a high-level pulse of
XLAT signal latches the serial data to the internal registers. The internal registers are level-triggered latches of
XLAT signal. All data are clocked in with the MSB first. The length of serial data is 96 bit or 192 bit, depending
on the programming mode. Grayscale data and dot correction data can be entered during a grayscale cycle.
Although new grayscale data can be clocked in during a grayscale cycle, the XLAT signal should only latch the
grayscale data at the end of the grayscale cycle. Latching in new grayscale data immediately overwrites the
existing grayscale data. Figure 6 shows the timing chart. More than two TLC5945s can be connected in series
by connecting an SOUT pin from one device to the SIN pin of the next device. An example of cascading two
TLC5945s is shown in Figure 7. The SOUT pin can also be connected to the controller to receive status
information from TLC5945 as shown in Figure 16.
Figure 6. Serial Data Input Timing Chart
Figure 7. Cascading Two TLC5945 Devices
11
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