TPS55289: Inquiries that NACK occurs in I2C communication of TPS55289

Hi Kim,

Have you checked the EN, VCC voltage of TPS55289?

From the waveforms, I don't think the I2C address is 75H. Please double check about this.

BRs,

Bryce

Dear, Bryce Xun,

I measured the place you mentioned again.

It still outputs NACK.

1. EN/UVLO (PIN 1) measured at 3.3 V.
2. VCC (PIN 18) is measured at 5.27 V.

3. Address waveform :0x75

jaehyung kim,

Dear, Bryce Xun,

Problem solved.
I didn't know I had to shift 1bit to the left.

Thanks alot.

jaehyung kim,