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OPT4048: How to use OPT4048 Register trigger mode via i2c

Part Number: OPT4048


Dear, the chip can trig measurement via Hardware trigger and Register trigger in one-shot mode .I see ,an I2C write to the M register triggers a measurement in Register trigger way.  But I can't find M register in the datasheet. Could you tell me the details on the register? Thank you.