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How to change TPS40400 switch frequency

Chiajung Hsu
Intellectual 280 points
Other Parts Discussed in Thread: TPS40400

Hi Sir,

I have a TPS40400 design. The processor is DM8168. I want to change FREQUENCY_SWITCH(33h) and MFR_SPECIFIC_00(D0h). So, I use the processor’s I2C interface to change these registers. But it doesn’t works. Our I2C command can read these registers correctly. So, I am not sure if any register needs to be set first so that I can change FREQUENCY_SWITCH(33h) and MFR_SPECIFIC_00(D0h).