ZHCSNL3A December 2021 – November 2023 TPSM8D6C24
PRODUCTION DATA
| CMD Address | 56h |
| Write Transaction: | Write Byte |
| Read Transaction: | Read Byte |
| Format: | Unsigned Binary (1 byte) |
| Phased: | No |
| NVM Backup: | EEPROM |
| Updates: | On-the-fly |
The VIN_OV_FAULT_RESPONSE command instructs the device on what action to take in response to a PVIN overvoltage fault. Upon triggering the PVIN overvoltage fault, the converter responds per 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 |
| VINOVF_RESP | VINOVF_RETRY | VIN_OVF_DLY | |||||
| LEGEND: R/W = Read/Write; R = Read only |
| Bit | Field | Access | Reset | Description |
|---|---|---|---|---|
| 7:6 | VIN_OVF_ RESP | RW | NVM | PVIN overvoltage fault response 00b: Ignore. Continue operating without interruption. 01b: Delayed shutdown continue operating for a number of switching cycles defined by VIN_OVF_DLY, then if fault persists, shut down and restart according to VIN_OV_RETRY. 10b: Immediate shutdown. Shut down and restart according to VIN_OV_RETRY. 11b: Invalid or not supported |
| 5:3 | VIN_OVF_ RETRY | RW | NVM | PVIN overvoltage retry 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). Restart attempts that occur while PVIN voltage is above VIN_OV_FAULT_LIMIT is not observable but is counted. 7d: After shutting down, wait one HICCUP period, and attempt to restart indefinitely, until commanded OFF, or a successful start-up occurs. |
| 2:0 | VIN_OVF_ DLY | RW | NVM | PVIN overvoltage delay time for respond after delay and HICCUP 0d: Shutdown delay of one PWM_CLK, HICCUP equal to TON_RISE 1d: Shutdown delay of one PWM_CLK, HICCUP equal to TON_RISE 2d - 4d: Shutdown delay of three PWM_CLK, HICCUP equal to two to four times TON_RISE 5d - 7d: Shutdown delay of seven PWM_CLK, HICCUP equal to five to seven times TON_RISE |
If (56h) VIN_OV_FAULT_RESPONSE is configured to ignore a VIN_OV_FAULT and a VIN_OV_FAULT is present at the time of enabling the device, the device does not start up. To ensure the part ignores any potential VIN_OV_FAULT at start-up, set the (55h) VIN_OV_FAULT_LIMIT greater than the maximum possible input voltage applied during start-up.
Attempts to write (56h) VIN_OV_FAULT_RESPONSE to any value outside those specified as valid are considered invalid or unsupported data and cause the TPSM8D6C24 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.