UCD3138064: UCD3138064 manually acknowledge to PMBUS slave address

Tina hsieh

Prodigy 230 points

Part Number: UCD3138064
Other Parts Discussed in Thread: UCD3138

Hi TI experts,

Can you provide sample code with UCD3138064 manually acknowledge to PMBUS slave address?

Thanks!

29 days ago

0 Jonathan Wong 29 days ago

TI__Genius 10230 points

Hello Tina,

I do not think we have any sample code besides the information in the TRM section 10.3.7, as referenced in the previous E2E post: UCD3138064: How can I set UCD3138064 that send I2C address 0x7F return NACK? However, I will look into this and get back to you.

Regards,

Jonathan Wong

0 Tina hsieh 29 days ago in reply to Jonathan Wong

Prodigy 230 points

Hi Jonathan

Thanks you for your reply.

I have another question. If register set manually acknowledged to address, command must also set manually acknowledged?

0 Jonathan Wong 26 days ago in reply to Tina hsieh

TI__Genius 10230 points

Hello Tina,

Can you please clarify what you mean by "register set manually" vs. "command set manually"?

To activate PMBus manual ack, you need to set PMBCTRL2.bit.MAN_CMD = 1. Then, you will need to make a custom PMBus handler in the firmware to manually say "if UCD3138 receives these PMBus commands, then send ACK. Else, then send NACK"

Regards,

Jonathan Wong

Power management

Power management forum

UCD3138064: UCD3138064 manually acknowledge to PMBUS slave address