LM3631: I2C access with NACK by 0x52

Jeff Liu3

Part Number: LM3631

LM3631 I2C communication problem, with tool, access 0x52 (8bit) as good, but with firmware, access 0x52, always NACK from LM3631.

How to deal with?

Regards,

Jeff

over 5 years ago

0 Angelos Tsiros over 5 years ago

TI__Intellectual 2140 points

Hi,

The LM3631 utilizes a standard I2C interface. I assume you are following the format below per LM3631 datasheet description on pages 37-39? I suspect the issue is with the formatting of the I2C data transfer.

0 Jeff Liu3 over 5 years ago in reply to Angelos Tsiros

Prodigy 20 points

Thank you for your prompt reply.

Please refer to attached waveform, seems match the request of I2C in datasheet, but can't get ACK somehow.

0 Angelos Tsiros over 5 years ago in reply to Jeff Liu3

TI__Intellectual 2140 points

Hi,

This looks okay, the part should acknowledge. Can you verify that the nRST pin is held high?

Regards,
Angelos Tsiros

Power management

Power management forum

LM3631: I2C access with NACK by 0x52