SLVSH95 July 2024 TPS546C25
ADVANCE INFORMATION
| CMD Address | 44h |
| Write Transaction: | Write Word |
| Read Transaction: | Read Word |
| Format: | ULINEAR16, Relative, per (20h) VOUT_MODE |
| NVM Backup: | EEPROM |
| Updates: | On-the-fly |
The VOUT_UV_FAULT_LIMIT command sets the value of the output voltage sensed at the (VOSNS − GOSNS) pins that causes an output undervoltage fault. The SEL_UVF bits set an undervoltage fault threshold relative to the current VOUT setting that is commanded by VOUT_COMMAND. The VOUT Tracking UVF function is activated after the soft-start ramp completes.
When the undervoltage fault condition is triggered, the device responds according to VOUT_UV_FAULT_RESPONSE.
Return to Supported PMBus Commands.
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 |
| R | R | R | R | R | R | RW | RW |
| Reserved | VOUT_UV_FAULT_LIMIT | ||||||
| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| RW | RW | RW | RW | RW | RW | RW | RW |
| VOUT_UV_FAULT_LIMIT | |||||||
| LEGEND: R/W = Read/Write; R = Read only |
| Bit | Field | Access | Reset | Description |
|---|---|---|---|---|
| 15:10 | Reserved | R | 000000b | Not used and always set to 0. |
| 9:0 | VOUT_UV_FAULT_LIMIT | R/W | NVM | Sets the undervoltage fault threshold. |
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.
Attempts to write VOUT_UV_FAULT_LIMIT to any value outside those specified as valid will be considered invalid/unsupported data and cause the device to respond by flagging the appropriate status bits and notifying the host according to the PMBus 1.3.1 Part II specification section 10.9.3.
| VOUT_UV_FAULT_LIMIT [10:0] | VOUT_UVF (V) | |
|---|---|---|
| Greater than or equal to | Less than | |
| 410d | 1024d | -16% |
| 369d | 410d | -24% |
| 328d | 369d | -32% |
| 328d | -50% | |