I have integrated the TLC5973 into a design, a section of the schematic is shown below:
There are 11 of these ICs in a chain.
When I attempt to program the devices, the data successfully cascades through the chain of devices, and a GSLAT sequence will allow the first device in the chain to be programed again:
However, no output is observed from the LEDs connected to the chips.
Here's a closer view of the signal sent to the first chip:
What reasons could cause this strange behavior?