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TLC5930 Datasheet, PDF (13/39 Pages) Texas Instruments – 12-CHANNEL LED DRIVER | |||
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TLC5930
PRINCIPLES OF OPERATION
SLLS528 â MARCH 2002
There are two different methods available as shown in Figure 6 for entering the gray-scale clock when in
light-ON mode. When the gray-scale clock is sequential, lighting-ON by the device is initiated after the HSYNC
packet operation for each device has been completed. When the external clock is used as gray-scale clock, all
the devices can be lighted-ON simultaneously by entering the gray scale clock after the HSYNC packet is
entered for the last device (in this example, just after OVM information reading packet has entered to IC1).
When Light-ON in a 4 Gray Scale With 16 ICs
When Gray Scale Clock Is Sequential (Including Use of Internally Generated Gray-Scale Clock)
GRAY SCALE
CLOCK
IC1 D/STIN
ÃÃÃÃ IC2 D/STIN
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ HSYNC Packet 32 bits
OVM Information Reading Packet 32bits
IC1 Constant Current Output
HSYNC Packet 32 bits
ON
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ OVM Information Reading Packet 32bits
IC2 Constant Current Output
ON
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ IC15 D/STIN
Other Packet
IC15 Constant Current Output
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ IC16 D/STIN
Other Packet
IC16 Constant Current Output
HSYNC Packet 32 bits
HSYNC Packet 32 bits
ÃÃÃÃÃÃONÃÃÃÃÃÃ
ÃÃÃÃÃÃOÃÃN ÃÃÃÃ
When Gray Scale Clock Is Not Sequential (External Input Only)
GRAY SCALE
CLOCK
IC1 D/STIN
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ HSYNC Packet 32 bits
OVM Information Reading Packet 32bits
IC1 Constant Current Output
ON
ÃÃÃÃ IC2 D/STIN
HSYNC Packet 32 bits
IC2 Constant Current Output
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ OVM Information Reading Packet 32bits
ON
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ IC15 D/STIN
Other Packet
IC15 Constant Current Output
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ IC16 D/STIN
Other Packet
IC16 Constant Current Output
HSYNC Packet 32 bits
HSYNC Packet 32 bits
ÃÃÃÃÃÃÃÃÃÃÃÃ
ÃÃÃÃÃÃÃÃONÃÃÃÃ
ON
Figure 6. Lighting-ON Operation With 16 Devices
www.ti.com
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