SLVSHH4 July 2024 TPS546E25
ADVANCE INFORMATION
CMD Address | 4Fh |
Write Transaction: | Write Word |
Read Transaction: | Read Word |
Format: | LINEAR11 |
Phased: | Yes |
NVM Backup: | EEPROM |
Updates: | On-the-fly |
The OT_FAULT_LIMIT command sets the temperature of the unit at which it indicates an overtemperature fault condition. The unit of this command is degrees Celsius. This feature utilizes a digital comparator that compares the output of the IC TEMPERATURE telemetry to the fault threshold selected in this register.
The device response to an overtemperature event is described in (50h) OT_FAULT_RESPONSE.
Return to Supported PMBus Commands.
15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 |
R | R | R | R | R | RW | RW | RW |
Reserved | OT_FAULT_LIMIT | ||||||
7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
RW | RW | RW | RW | RW | RW | RW | RW |
OT_FAULT_LIMIT |
15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | |||||||
R | R | R | R | R | RW | RW | RW | |||||||
Reserved | OT_FAULT_LIMIT | |||||||||||||
7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |||||||
RW | RW | RW | RW | RW | RW | RW | RW | |||||||
OT_FAULT_LIMIT |
LEGEND: R/W = Read/Write; R = Read only |
Bit | Field | Access | Reset | Description |
---|---|---|---|---|
15:11 | EXPONENT | R | 00010b | Linear format two’s complement exponent with a result of 4 degrees Celcius LSB. |
10:6 | Reserved | R | 00000b | Not used and always set to 0. |
5:0 | OT_FAULT_LIMIT | R/W | NVM (default 10 0010b (145 degrees C) | These bits select the over-temperature fault threshold in the controller die, based on the precision temperature sensor in the telemetry system. |
Every mantissa binary value in the writable bits is writeable and readable. However, the actual divider is set to the nearest supported value. Additionally, that mantissa value restored from EEPROM is fixed for each setting supported in hardware.
Attempts to change the read-only bits (OT_FAULT_LIMIT[15:6]) will be considered invalid/unsupported data. The device will NACK the unsupported data and the received value will be ignored. The ’cml’ bit in the STATUS_BYTE and the ‘ivd’ bit in the (7Eh) STATUS_CML registers will be set.
OT_FAULT_LIMIT [5:0] | OTF (deg C) | |
---|---|---|
Greater than or equal to | Less than | |
30d | 115 | |
30d | 31d | 120 |
31d | 32d | 125 |
32d | 34d | 130 |
34d | 35d | 135 |
35d | 36d | 140 |
36d | 37d | 145 |
37d | 150 |