TLC5930PWPR Datasheet, PDF (13/40 Pages) Texas Instruments – 12-CHANNEL LED DRIVER

TLC5930
PRINCIPLES OF OPERATION
SLLS528 – 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
ÔÔÔÔ _{IC2 D/STIN}
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÌÌÌÌÌÌÌÌÌÌÌÌ _{HSYNC Packet 32 bits}
OVM Information Reading Packet 32bits
IC1 Constant Current Output
HSYNC Packet 32 bits
ON
ÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÓÓÓÓÓÓÓÓÓÓ _{OVM Information Reading Packet 32bits}
IC2 Constant Current Output
ON
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ ^{IC15 D/STIN}
Other Packet
IC15 Constant Current Output
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ ^{IC16 D/STIN}
Other Packet
IC16 Constant Current Output
HSYNC Packet 32 bits
HSYNC Packet 32 bits
ÏÏÏÏÏÏ_ONÏÏÏÏÏÏ
ÎÎÎÎÎÎ_OÎÎ_N ÎÎÎÎ
When Gray Scale Clock Is Not Sequential (External Input Only)
GRAY SCALE
CLOCK
IC1 D/STIN
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÌÌÌÌÌÌÌÌÌÌÌÌ _{HSYNC Packet 32 bits}
OVM Information Reading Packet 32bits
IC1 Constant Current Output
ON
ÔÔÔÔ ^{IC2 D/STIN}
HSYNC Packet 32 bits
IC2 Constant Current Output
ÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÏÓÓÓÓÓÓÓÓÓÓ OVM Information Reading Packet 32bits
ON
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ IC15 D/STIN
Other Packet
IC15 Constant Current Output
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ _{IC16 D/STIN}
Other Packet
IC16 Constant Current Output
HSYNC Packet 32 bits
HSYNC Packet 32 bits
ÏÏÏÏÏÏÏÏÏÏÏÏ
ÎÎÎÎÎÎÎÎ^ONÎÎÎÎ
ON
Figure 6. Lighting-ON Operation With 16 Devices
www.ti.com
13