Other Parts Discussed in Thread: UCD90120A, UCD9090, UCD90160A, UCD90160, UCD90320U, UCD90120, UCD9090A, UCD90124, UCD90124A, UCD90320
It is optional. UCD90xxx devices send and receive a packet error code (PEC) if the PMBus host supports it. No special configuration is needed.
A PEC is a CRC-8 checksum appended after each transaction. It enables devices to detect communication errors and discard corrupted messages. It is always recommended to implement PECs in the host.
For more FAQ please check the following document.
UCD90xxx Family Frequently Asked Questions and Answers
UCD9090 UCD9090A UCD90120 UCD90120A UCD90124 UCD90124A UCD90160 UCD90160A UCD90320 UCD90320U