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Original question:

TPS546C23: TPS546C23: Query related to TPS546C20A and TPS546C23 Excel Calculator and Layout Checklist

TPS546C23: TPS546C23 PMBus Address Value in Octal/Decimal

Kapil Kesharvani
Prodigy 250 points
Part Number: TPS546C23


Hello TI Team,

In TPS546C23 calculator the value of PMBus address in which coded system?  is it Octal or decimal form?

Can someone clarify it?  Your quick response in this regard will be highly appreciable.

  • 0
    TI__Guru 56985 points

     

    (corrected)

    That Excel tool is using the OCTAL (00oct - 77oct) value for the PMBus Address.  Each digit of the octal value selects 1 of the 2 resistors.  The Left digit selects the value of ADDR1 while the Right Digit selects the value of VDDR0.

    44 oct is

    24h

    b'010 0100

    36d 

    My apologies for the confusion.

  • 0 in reply to Peter James Miller
    Prodigy 250 points

    Hello Peter, 

    I have some confusion with respect to webbench tool and design calculator address.

    1. Design Calculator provide the value of address resistor R_addro= 51K and R_addr1= 51K for decimal value of 44 (0x2ch- 0101100)b).

    The Same, I checked 0n webbench by selecting the device address 44d, The respective values of R_addro= 51K and R_addr1= 78.7K.

    So  this device address is different from PMBUS Address? 

    Would you please clear this point and and tell me, what value I should take to communicate (PMBUS-i2c) with regulator?

  • 0 in reply to Kapil Kesharvani
    TI__Guru 56985 points

    My deepest apologies, I was looking at a different tool.

    That excel tool is using the OCTAL value (00 - 77) to calculate the resistor values.  I will correct my response above.