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UCD90160: PMBUS address question

Nir Flysher
Expert 3367 points
Part Number: UCD90160


Dear Team,

Can you please help with the customer question below ?

I would like you to clarify a topic I found to be not well defined, regarding the UCD90160.

 Data sheet Ch. 7.4.20 guides how to select the device PMBUS address and which addresses should be avoided.

 Table 8 looks to be incoherent due to the fact that the first and last rows seems to have a lack of information- "open" and "short"  represents the resistance and so it should be in the other column. Furthermore, no address bin is associated with "open" and "short".

 As example, table 9 states that 13 is a valid address. According to formula right above table 8, VAD0x are both needs to be set to 1. But, table 8 do not provide the required resistance value in order to set this address. According to table 8, the first available address is 52 (12*4+4), which contradict table 9.

Reagrds,

Nir.

  • 0
    TI__Guru 66840 points

    HI

    If you look the first sentence after the Table, it clearly says that 126(0x7E) is the address for short or open case.

    Table 9 is the addresses that allowed by the PMBus spec, but the address that supported by the UCD90160 is defined by the formula 12 X Bin(Vad01) + bin(Vad00).

    address 52 is a valid address allowed by PMBus spec and supported by UCD90160. Please refer the row "13-125" in the Table 9.  

    Regards

    Yihe

  • 0 in reply to yihe
    TI__Expert 3367 points

    Response from customer (had issues with replying directly)

     

    Well, I guess I've missed the first sentence right below the table, but yet it didn’t answer my question. The last paragraph in my original message asks how to set address 13 for example, which is 12*1+1 but table 8 address bin start from 4. What resistors to connect if I want address bin 1/2/3?

  • 0 in reply to Nir Flysher
    TI__Guru 66840 points

    Hi

    As explained in the previous reply, Table 9 defines the address that allowed by the PMBus spec. but not all address allowed by PMBus are supported by UCD90160. You can only get the address defined by 12XBIN(Vad01) + bin(Vad00).

    Regards

    Yihe