TLC5930 Datasheet, PDF (24/39 Pages) Texas Instruments – 12-CHANNEL LED DRIVER

TLC5930
SLLS528 – MARCH 2002
PRINCIPLES OF OPERATION
all output force off
By writing 0 to force-ON flag and 1 to force-OFF flag in this packet, all the outputs can be turned off
simultaneaously. Also, in this mode, by writing 0 to force-ON flag and 0 to force-OFF flag, it returns to the normal
operation.
all output force on
By writing 1 to force-ON flag and 0 to force-OFF flag in this packet, all the output are turned on independent
of the gray scale data from next HSYNC packet after this packet. At this time, the current value depends on the
plane brightness adjustment data and dot correction data. However, when both DCEN and BCEN are 0, it is
100% of the current value set by R_IREF. Also, in this mode, by writing 0 to force-ON flag and 0 to force-OFF flag,
it returns to the normal operation after sending the HSYNC packet.
Table 10. All Outputs Forced ON Sequence Example
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 1 Plane brightness, dot corection data setting packet
2 Operation mode setting packet: force ON = 1 and force OFF = 0
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{3 HSYNC synchronization packet}
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{4 Operation mode setting packet: force ON = 0 and force OFF = 0}
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 5 HSYNC synchronization packet
Set desired value for output current.
Demand all output force ON.
Al outputs force ON.
Demand return to normal operation
Return to normal operation
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{Figure 8 shows the operation concept for this mode. All the constant-current outputs are turned on with the}
current value set independent of the gray-scale data by HSYNC packet after writing 1 to force-ON flag and 0
to force-OFF flag in operation mode setting packet (these are not turned on if the dot correction value is 0). It
remains in that state independent of gray scale clock until all output force off mode in the packet is sent or
HSYNC packet is sent after writing 0 to force-ON flag and 0 to force-OFF flag in the packet.
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