SLVSH95 July 2024 TPS546C25
ADVANCE INFORMATION
| CMD Address | 2Ah |
| Write Transaction: | Write Word (if external feedback resistor is selected via MSEL1 pinstrap) |
| Read Transaction: | Read Word |
| Format: | LINEAR11 |
| Updates: | On-the-fly when writable |
| NVM Back-up: | EEPROM or VSEL resistor |
VOUT_SCALE_MONITOR indicates how VOUT scaling should be done if the external feedback resistor option is selected via MSEL1 pinstrap. VOUT_SCALE_MONITOR is set to VOUT_SCALE_LOOP when an internal feedback resistor is used and this command is then read only. If an external feedback resistor divider is selected, the user must select a value for VOUT_SCAL_MONITOR, which will then be used internall in place of the VOUT_SCALE_LOOP value.
Return to Supported PMBus Commands.
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 |
| R | R | R | R | R | R | R | R |
| EXPONENT | VOUT_SCALE_MONITOR | ||||||
| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| R | R | R | R | R/W | R/W | R/W | R/W |
| VOUT_SCALE_MONITOR | |||||||
| 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_MONITOR | R | 0 | Not used and always set to 0. |
| 3:0 |
VOUT_SCALE_MONITOR |
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. If the VOUT_SCALE_MONITOR value is chosen such that the maximum allowed VOSNS-GOSNS from the table is violated, then the reported READ_VOUT will not be accurate.
| VOUT_SCALE_MONITOR mantissa (decimal) | Internal divider gain | VOUT_SCALE_MONITOR mantissa EEPROM restore value (decimal) | Maximum allowed VOUT (VOSNS-GOSNS) (V) | |
|---|---|---|---|---|
| Greater than or equal to | Less than | |||
| 0 | 2 | 0.125 | 1 | 5.5 |
| 2 | 4 | 0.25 | 2 | 3 |
| 4 | 8 | 0.5 | 4 | 1.5 |
| 8 | 16 | 1.0 | 8 | 0.75 |