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DS90UB935-Q1: I2C frequency issue in 935 side

Hao Wang14
Expert 4415 points

Part Number: DS90UB935-Q1

Hi Team,

The reference clock for 935 and 936 is 24MHz, the I2C is set to fast mode(400kHz), the processor sends command through I2C in 936 side to configure the EEPROM in camera side which is connected to 935, it's found that the I2C frequency in 936 is 400kHz, however, the decoded I2C signal frequency changes to 138kHz, the waveforms are as below:

Could you please help explain why the I2C signal frequency is far away from 400kHz? 

How to solve this issue such as registers configuration or hardware change?

Thanks and Best Regards!

Hao