I am using the OPT8241-CDK-EVM with an attached debug connector J2. Using J2 I am supplying the trigger signal EXT_VD_IN to the sensor board for applying an externally initiated image capture. I am programming the OPT9221 TG:0x81 register as documented with value 0x0000A1 to activate the slave mode of the sensor. However when starting the sensor by writing 0x000000 to TG:0x80 the sensor will not care about the trigger signal but will deliver data just as if no slave mode would be selected. So it seems like it does not matter whether I write 0x0000A0 or 0x0000A1 to TG:0x81 (prior to starting the TG) the sensor is always free running (like master mode).
I have checked the EXT_VD_IN signal going into J2 with a scope and can see the trigger pulses but they seem to be neglected by the OPT9221.
What detail am I missing?