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TPS546C23: PMBUS address verification

SATHYA SHREE S
Intellectual 650 points
Part Number: TPS546C23

Tool/software:

Hi,

We are using TPS546C23RVFR in our design for conversion of 12V to 5V. Since the regulator address is set in the form of octal digits.

We have used Resistor values for ADDR1 as 34.8K and ADDR0 as 14K. So the calculated hexadecimal address would be 0X31 but the address we got while testing is 0x19.

So, this means the octal value of 31 got converted to hexadecimal of 19?

Thanks

S Sathya shree

  • 0
    TI__Guru 56965 points

     

    The conversion of the the two 3-bit (Octal) values from ADDR0 and ADDR1 into the 7-bit PMBus address are:

    0 | ADDR1[2:0] |ADDR0[2:0]

    ADDR1 = 3 [011] and ADDR0 = 1 [001]  would be:

    0 | 01 1| |001| which would be 0x19 

    This can also be solved by: DEC2HEX ( 8 x ADDR1 + ADDR2)

    Which is 8 x 3 + 1 = 24 + 1 = 25d which is 0x19h