JAJSP25 November 2023 TPS546A24S
PRODUCTION DATA
| CMD Address | 40h |
| Write Transaction: | Write Word |
| Read Transaction: | Read Word |
| Format: | ULINEAR16 Relative or Absolute per VOUT_MODE |
| Phased: | No |
| NVM Back-up: | EEPROM |
| Updates: | On-the-fly |
The VOUT_OV_FAULT_LIMIT command sets the value of the output voltage measured at the sense or output pins that causes an output overvoltage fault. VOUT_OV_FAULT_LIMIT sets an over-voltage threshold relative to the current VOUT_COMMAND. Updates to VOUT_COMMAND do not update the value of VOUT_OV_FAULT_LIMIT when the absolute format is used. Note that even with VOUT_MODE configured in absolute format, the true overvoltage fault limit remains relative to the current VOUT_COMMAND. VOUT_OV_FAULT_LIMIT is active as soon as the TPS546A24S completes its Power-On Reset, even if output conversion is disabled.
Following an overvoltage fault condition, the TPS546A24S responds according to VOUT_OV_FAULT_RESPONSE.
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 |
| RW | RW | RW | RW | RW | RW | RW | RW |
| VOUT_OVF (High Byte) | |||||||
| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| RW | RW | RW | RW | RW | RW | RW | RW |
| VOUT_OVF (Low Byte) | |||||||
| LEGEND: R/W = Read/Write; R = Read only |
| Bit | Field | Access | Reset | Description |
|---|---|---|---|---|
| 15:0 | VOUT_ OVF | RW | See Below | Sets the overvoltage fault limit. Format is per VOUT_ MODE. |
Hardware Support and Value Mapping
The Hardware for VOUT_OV_FAULT_LIMIT is implemented as a fixed percentage of the current output voltage target. Depending on the VOUT_MODE setting, the value written to VOUT_OV_FAULT_LIMIT must be mapped to the hardware percentage.
Programmed values not exactly equal to one of the hardware relative values shall be rounded up to the next available relative value supported by hardware. The hardware supports values from 105% to 140% of VOUT_COMMAND in 2.5% steps. When output conversion is disabled, the hardware supports values from 110% to 140% of VOUT_COMMAND in 10% steps.
Attempts to write VOUT_OV_FAULT_LIMIT to any value outside those specified as valid will be considered invalid/unsupported data and cause the TPS546A24S 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.