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OPT3101: Frequency Calibration with external reference clock

Part Number: OPT3101


Tool/software:

Hi,

I am trying to implement the external frequency calibration into my calibration script ( as per OPT3101 Distance Sensor System Calibration (sbau310)).

Custom Hardware.

Opt runs fine without ext freq calib, trying for more precision.

Trimmed frequency works as expected, however setting EN_AUTO_FREQ_COUNT =1 tanks my measured phase (_H = 5, _L = 7) and the calibration is void.

My ext clock runs at 32789 +- 0.140 Hz

REF_COUNT_LIMIT=19518

SYS_CLK_DIVIDER=10

On another note, what order is required for setting the various frequency calibration register? Is there a required timing to set START_FREQ_CALIB = 0, or should i leave this high?

Appreciate the help.

Regards, Josh