ZHCSIO9A August 2018 – June 2021 TPSM831D31
PRODUCTION DATA
The STATUS_BYTE command returns one byte of information with a summary of the most critical faults, such as over-voltage, overcurrent, over-temperature, etc.
The STATUS_BYTE command must be accessed through Read Byte transactions. STATUS_BYTE is a paged register. In order to access STATUS_WORD command for channel A, PAGE must be set to 00h. In order to access STATUS_WORD register for channel B, PAGE must be set to 01h. If PAGE is set FFh, the device return value will reflect the status of Channel A.
| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| 0 | R | R | R | R | R | R | R |
| BUSY | OFF | VOUT_OV | IOUT_OC | VIN_UV | TEMP | CML | OTHER |
| Bit | Field | Type | Reset | Description |
|---|---|---|---|---|
| 7 | BUSY | R | 0 | Not supported and always set to 0. |
| 6 | OFF | R | Current Status | This bit is asserted if the unit is not providing power to the output, regardless of the reason, including simply not being enabled. 0: Raw status indicating the IC is providing power to VOUT. 1: Raw status indicating the IC is not providing power to VOUT. |
| 5 | VOUT_OV | R | Current Status | Output Over-Voltage Fault Condition 0: Latched flag indicating no VOUT OV fault has occurred. 1: Latched flag indicating a VOUT OV fault occurred |
| 4 | IOUT_OC | R | Current Status | Output Over-Current Fault Condition 0: Latched flag indicating no IOUT OC fault has occurred. 1: Latched flag indicating an IOUT OC fault has occurred. |
| 3 | VIN_UV | R | Current Status | Input Under-Voltage Fault Condition 0: Latched flag indicating VIN is above the UVLO threshold. 1: Latched flag indicating VIN is below the UVLO threshold. |
| 2 | TEMP | R | Current Status | Over-Temperature Fault/Warning 0: Latched flag indicating no OT fault or warning has occurred. 1: Latched flag indicating an OT fault or warning has occurred. |
| 1 | CML | R | Current Status | Communications, Memory or Logic Fault 0: Latched flag indicating no communication, memory, or logic fault has occurred. 1: Latched flag indicating a communication, memory, or logic fault has occurred. |
| 0 | OTHER | R | Current Status | Other Fault (None of the Above) This bit is used to flag faults not covered with the other bit faults. In this case, UVF or OCW faults are examples of other faults not covered by the bits [7:1] in this register. 0: No fault has occurred 1: A fault or warning not listed in bits [7:1] has occurred. |
Per the description in the PMBus 1.3 specification, part II, TPSM831D31 does support clearing of status bits by writing to STATUS registers. However, the bits in the STATUS_BYTE are summary bits only and reflect the status of corresponding bits in STATUS_VOUT and STATUS_IOUT. To clear these bits individually, the user must clear them by writing to the corresponding STATUS_X register. For example: the output overcurrent fault sets the IOUT_OC bit in STATUS_BYTE, and the IOUT_OC_FLT bit in STATUS_IOUT. Writing a 1 to the IOUT_OC_FLT bit in STATUS_IOUT clears the fault in both STATUS_BYTE and STATUS_IOUT. Writes to STATUS_BYTE itself will be treated as invalid transactions.