UCD3138: PMBus timing requirement for 100Khz and 1Mhz

Harry Ma

Intellectual 2580 points

Part Number: UCD3138

Hi Team

as showing in following, Data hold time requirement is 0ns for 400khz, how about for 100k and 1Mhz? 0ns is ok?

over 1 year ago

0 Jonathan Wong over 1 year ago

TI__Expert 8580 points

Hello Harry,

The Data Hold Time (HD:DAT) is specified to be 0ns by the current SMBus and I2C standards. This is also set for all speeds, including 100kHz and 1MHz. See page 85 of the SMBus specs sheet v3.2 (http://smbus.org/specs/). PMBus follows the same specs as SMBus.

Regards,

Jonathan Wong

Power management

Power management forum

UCD3138: PMBus timing requirement for 100Khz and 1Mhz