SLVSDF3F MARCH 2017 – JANUARY 2019 TPSM846C23
The output voltage of the TPSM846C23 is designed to be set via the PMBus using the VOUT_COMMAND (21h).
To set the output voltage to 1.2 V, using Equation 15, the calculated VOUT_COMMAND value is 614, which converted to hex is 266h. This value can be written to RAM using the VOUT_COMMAND and saved as the new default value to non-volatile memory using the STORE_DEFAULT_ALL command.
The actual output voltage is also dependant on the value of VOUT_SCALE_LOOP (29h) and the presence of a resistor, RSET. Because the desired output voltage is between 0.35 V and 1.65 V (VOUT_SCALE_LOOP = 1), the RSET resistor must be left open.