TLC5973D Datasheet, PDF (22/27 Pages) Texas Instruments – 3-Channel, 12-Bit, PWM Constant-Current LED Driver

TLC5973
SBVS225A – MARCH 2013 – REVISED MAY 2013
V_LED Power
1st Device SDI
1st Device SDO
MSB
LSB
MSB
LSB
MSB
48-Bit Data Packet
for 1st Device
EOS
48-Bit Data Packet
for 2nd Device
EOS
For 3rd
Device
LSB
MSB
LSB
For
N-1th
EOS
48-Bit Data Packet
for Nth Device
GSLAT
48-Bit Data Packet
for 2nd Device
EOS
For 3rd
Device
For
N-1th
EOS
48-Bit Data Packet
for Nth Device
GSLAT
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MSB
LSB
Next Data Packet
for 1st Device
N-2nd Device SDO
N-1st Device SDO
OUTn
For 3rd
Device
For
N-1st
EOS
48-Bit Data Packet
for Nth Device
GSLAT
48-Bit Data Packet
for Nth Device
GSLAT
Figure 24. Data Packet Input Order for N TLC5973 Units
PWM Control Starts
with new GS Data
CONNECTOR DESIGN APPLICATION
When the connector pin of the device application printed circuit board (PCB) is connected or disconnected to
other PCBs, the power must be turned off to avoid device malfunction or failure. Furthermore, designing the
connector GND pin to be longer than other pins (as shown in Figure 25) is preferable. This arrangement allows
the GND line to either be connected first or disconnected last, which is imperative for proper device function.
GND
VCC (V_LED)
To N-1st
Device
PCB or
Controller
and Power
Supply
Nth Device PCB
N+1st Device PCB
To
N+2nd
Device
PCB
SDI
Connector (Male)
Figure 25. Connector Pin Design Application
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