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TLC5923 LOD - how to correctly obtain the LOD information?

Jozef Molnar
Prodigy 10 points
Other Parts Discussed in Thread: TLC5923

Dear Experts,

I want always to move in the dot correction data, the on/off data and obtain the LOD info in one frame, so I am using the TLC5923 in the following way:

1. MODE=1 -> shift-in 112 bits for dot correction -> toggle XLAT

2. MODE=0 -> shift-in 16 bits for on/off data -> toggle XLAT

So far so good. Now I understand from the datasheet, that I need some time (~2us) to let the LOD registes update. After that the XLAT rising edge moves the LOD data into the on/off shift register, so as next I do:

3. wait 2us, toggle XLAT, shift-out 16 bits of LOD data.

I get the correct LOD data but my problem is that the observed OUT15 switches off at this point and during the shift-out of the LOD data I have to provide the same on/off information, otherwise the switches get updated from some other information.

What is the correct procedure, if I want to shift-in on/off data and get the LOD data without disturbing the output states? In my application the outputs must have a defined state and cannot toggle for a few [us] as they do now for me.

I appreciate any advice in advance.

Best regards

Jozef Molnar