Hello,
We have a mode where we have to dim to really low levels. Is there a trick to doing this? We been able to use the grey scale for brightness and on/off without any trouble, and have just left the DOT register at 1's.
Our assumption has been the DOT correction is supposed to be 6 bits/LED, or 96 bits for each device. We've played with sending various combinations/patterns to the DC mode register, but we are struggling to see any correlation between the values we send and the results we see in terms of brightness. The brightness does change, but we just can't predict what values/patterns we should be sending. We've even tried sending values in other bit alignments, from 2 bits, to 16 bits per value, and every size in between. Again, just can't figure out what works.
Also, the datasheet says that "the TEST pin must be connected to VCC to ensure proper operation of the DOTcorrection circuitry". We are doing that. The only other thing to note is that we aren't conecting a couple of the LED outputs. I wouldn't expect that to be an issue, but if that would cause some sort of error state, I wanted to mention that.
Any thoughts?
Thanks