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The PMBus specification (>= Rev1) specifies that the query command returns a data byte with a binary bit pattern of 001 in bits 4:2 if the format used for the queried command is a "16 bit signed number".

this is the only mention I can find of this data format (distinct from other 16 bit formats already covered by other bit patterns) within the PMBus standard.

What does this relate to? (AVS maybe?) Am I missing something silly?

*Note that I come at this from the device designer side rather than the host system side

Toby
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This is just a 2's complement signed integer, as I believe.

Mark
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  • Did you mean that this is a format made available for manufacturers to use as they wish? (I mean I know what a 16 bit unsigned integer consists of :D) But there are no specification defined commands mentioned that use it or any other mention of it in the spec *at all* – Toby Aug 05 '16 at 08:16
  • @Toby, no, I mean this just is the most widely used signed integer format. Please see https://en.wikipedia.org/wiki/Two%27s_complement. – Mark Aug 05 '16 at 09:05
  • Well this I know. I am asking *sepcifically* in the context of the PMBus specification however. All other formats used within this spec have information on *where* they are used, with which commands, etc. Conversely this format doesn't actually appear to be used! Thus my confusion in how it is included in the QUERY command. – Toby Aug 05 '16 at 09:28