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[FAQ] TPS549A20: SMBus Device ID for TPS549A20, TPS53819A, TPS53915, and TPS53913

Kadeem Samuel
Genius 17080 points
Part Number: TPS549A20
Other Parts Discussed in Thread: TPS53915, TPS53819A

How do I find the PMBus device ID for the TPS549A20?

The command code 0xFC is used for PMBus self-discovery for the TPS549A20. The expected response is either 0x0089 or 0x0090.

The data returned is 0x89, 0x00. Is 0x00 the revision code and 0x89 is the Device ID?

There is no revision code for the TPS549A20. PMBus returns data in the order of low byte, high byte, so the returned data, while read in the order 0f 0x89 0x00, when interpreted properly is the correct device ID 0x0089.

Are there other devices that share the same self-discovery code as the TPS549A20?

Yes: the TPS53819A, TPS53915, and TPS53913 all share the same self-discovery code.