SLVSHH4 July 2024 TPS546E25
ADVANCE INFORMATION
CMD Address | 29h |
Write Transaction: | Write Word |
Read Transaction: | Read Word |
Format: | SLINEAR11 |
Updates: | Output disabled: see below. Output enabled: read-only. |
NVM Back-up: | EEPROM |
VOUT_SCALE_LOOP allows PMBus devices to map between the commanded voltage and the voltage at the control circuit input. The VOUT_SCALE_LOOP also programs an internal precision resistor divider so no external divider is required.
If MSEL1 pinstrap results in external resistor divider (VSEL/FB pin configured as a FB pin with external resistor divider), VOUT_SCALE_LOOP mantissa is set to 8.
The VOUT_SCALE_LOOP data can be written over PMBus only if:
Return to Supported PMBus Commands.
15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 |
R | R | R | R | R | R | R | R |
EXPONENT | VOUT_SCALE_LOOP | ||||||
7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
R | R | R | R | R/W | R/W | R/W | R/W |
VOUT_SCALE_LOOP |
LEGEND: R/W = Read/Write; R = Read-only |
Bit | Field | Access | Reset | Description |
---|---|---|---|---|
15:11 | EXPONENT | R | 1 1101b | Linear format two’s complement exponent. Fixed exponent of -3 resulting in 0.125 LSB. |
10:4 | VOUT_SCALE_LOOP | R | 0 | Not used and always set to 0. |
3:0 | VOUT_SCALE_LOOP | R/W | NVM or VSEL resistor | Linear format two’s complement mantissa. If the OVRD_VSEL bit in Section 7.70 is set to 0, this value is set by the resistance detected from the VSEL pin to ground. To program this to a different value through PMBus, the OVRD_VSEL bit must be set to 1 and stored to NVM, then the device's VCC reset. |
Every mantissa binary value in the writable bits is writeable and readable. However, the actual divider is set to the nearest supported value. Additionally, that mantissa value restored from EEPROM is fixed for each setting supported in hardware. Refer to Table 7-81.
VOUT_SCALE_LOOP mantissa (decimal) | Internal divider gain | VOUT_SCALE_LOOP mantissa EEPROM restore value (decimal) | |
---|---|---|---|
Greater than or equal to | Less than | ||
0 | 2 | 0.125 | 1 |
2 | 4 | 0.25 | 2 |
4 | 8 | 0.5 | 4 |
8 | 16 | 1.0 | 8 |