ZHCSON0A August 2022 – September 2023 TPSM8D6B24
PRODUCTION DATA
| CMD Address | 41h |
| Write Transaction: | Write Byte |
| Read Transaction: | Read Byte |
| Format: | Unsigned Binary (1 byte) |
| Phased: | No |
| NVM Backup: | EEPROM |
| Updates: | On-the-fly |
The VOUT_OV_FAULT_RESPONSE command instructs the device on what action to take in response to an output overvoltage fault. Upon triggering the overvoltage fault, the TPSM8D6B24 controller responds according to the following data byte, and the following actions are taken:
| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| RW | RW | RW | RW | RW | RW | RW | RW |
| VO_OV_RESP | VO_OV_RETRY | VO_ OV_ DELAY | |||||
| LEGEND: R/W = Read/Write; R = Read only |
| Bit | Field | Access | Reset | Description |
|---|---|---|---|---|
| 7:6 | VO_OV_RESP | RW | NVM | Output overvoltage response 00b: Ignore. Continue operating without interruption. 01b: Shut down. Shut down and retry according to VO_OV_RETRY. 10b: Shut down. Shut down and retry according to VO_ OV_ RETRY. 11b: Invalid or unsupported |
| 5:3 | VO_OV_RETRY | RW | NVM | 0d: Do not attempt to restart (latch off). 1d - 6d: After shutting down, wait one HICCUP period, and attempt to restart up to one to six times. After one to six failed restart attempts, do not attempt to restart (latch off). 7d: After shutting down, wait one HICCUP period, and attempt to restart indefinitely, until commanded OFF, or a successful start-up occurs. |
| 2:0 | VO_OV_DELAY | RW | NVM | 0d: VO_OV HICCUP period is equal to TON_RISE. 1d - 7d: VO_OV HICCUP period is equal to one to seven times TON_RISE. |
Attempts to write VOUT_OV_FAULT_RESPONSE to any value outside those specified as valid are considered invalid or unsupported data and cause the TPSM8D6B24 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.
A restart attempt is successful and the restart limit counter is reset to 0 when no fault with a shutdown response is observed after one (61h) TON_RISE time after completing (61h) TON_RISE or after (62h) TON_MAX_FAULT_LIMIT if (62h) TON_MAX_FAULT_LIMIT is not set to 0 ms (Disabled).
If (41h) VOUT_OV_FAULT_RESPONSE is configured to ignore a VOUT_OV_FAULT, and a VOUT_OV_FAULT is present at the time of enabling the device, the device does not start up. To ensure the part ignores any potential VOUT_OV_FAULT at start-up, set the (40h) VOUT_OV_FAULT_LIMIT greater than the maximum possible input voltage applied during start-up.