SLVSHH4 July 2024 TPS546E25
ADVANCE INFORMATION
| CMD Address: | 79h |
| Write Transaction: | N/A |
| Read Transaction: | Read Word |
| Format: | Unsigned Binary (2 bytes) |
| NVM Back-up: | No |
| Updates: | On-the-fly |
The STATUS_WORD command returns two bytes of information with a summary of the most critical faults, such as overvoltage, overcurrent, overtemperature, and so forth. The low byte of the STATUS_WORD is the same register as the STATUS_BYTE. The supported STATUS_WORD message content is described in the following table. The conditions in the STATUS_BYTE are summary information only.
All of these bits can trigger SMB_ALERT# and have a corresponding bit in SMBALERT_MASK.
Attempts to write STATUS_WORD 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.
Secondary devices will set bits PGOOD_Z and OVF to 0b.
Return to Supported PMBus Commands.
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 |
| R | R | R | R | R | R | R | R |
| VFW | OCFW | INPUT | MFR | PGOOD_Z | 0 | OTHER | 0 |
| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| R | R | R | R | R | R | R | R |
| STATUS_BYTE | |||||||
| LEGEND: R/W = Read/Write; R = Read only |
| Bit | Field | Access | Reset | Description |
|---|---|---|---|---|
| 15 | VFW | R | 0b | Output Voltage Fault or Warning. A fault or warning in (7Ah) STATUS_VOUT is
present (OVF + OVW + UVF + UVW + VOUT_MAX_Warning). 0b: An output voltage related fault has NOT occurred. 1b: An output voltage fault has occurred. The host should check STATUS_VOUT for more information. |
| 14 | OCFW | R | 0b | Output Current Fault or Warning. A fault or warning in (7Bh) STATUS_IOUT is
present (OCF + OCW). 0b: An output current related fault has NOT occurred. 1b: An output current fault has occurred. The host should check STATUS_IOUT for more information |
| 13 | INPUT | R | 0b | INPUT fault or warning in (7Ch) STATUS_INPUT is present. Depends on LOW_VIN that
may come up as a 1, if initially VIN<VIN_ON. 0b: An input related fault has NOT occurred. 1b: An input fault has occurred. The host should check (7Ch) STATUS_INPUT for more information. |
| 12 | MFR | R | 0b | Manufacturer specific fault/warning condition. A fault or warning in STATUS_MFR_SPECIFIC is present, with the exception of
bit 7 DCM. 0b: A Manufacturer-defined fault has NOT occurred. 1b: A Manufacturer-defined fault has occurred. The host should check STATUS_MFR_SPECIFIC for more information. |
| 11 | PGOOD_Z | R | 0b | Power Good Inverted. The Power Not Good is used to flag when the converter output
voltage drops below the FAULT_LIMIT as defined by VOUT_OV_FAULT_LIMIT and VOUT_UV_FAULT_LIMIT. The signal is unlatched and always
represents the current state of the device. 0b: The output voltage is within the regulation window. PG pin is floating. 1b: The output voltage is NOT within the regulation window. PG pin is pulled low. Note: Per PMBus spec v1.4 10.2.5.3, PGOOD_Z cannot be cleared by a PMBus write. It always reflects the current state of the device. Please reference the SMBALERT_MASK command for specific details regarding access to the PGOOD_Z mask bit. In secondary devices PGOOD_Z will always be set to 0 and the primary device will communicate the POWER_GOOD status of the stack. |
| 10 | Not Supported | R | 0b | Not supported and always set to 0. |
| 9 | OTHER | R | 0b | STATUS_OTHER fault/warning condition. A fault or
warning (FRST_2_ALRT) in STATUS_OTHER is present. 0b: A STATUS_OTHER fault or warning has not occured. 1b: A STATUS_OTHER fault or warning has occured. |
| 8 | Not Supported | R | 0b | Not supported and always set to 0. |
| 7:0 | STATUS_BYTE | R | 00h | Always equal to the STATUS_BYTE value. |