SLUSF27 Data sheet

SLUSF27 November 2023 TPS546B24S

PRODUCTION DATA

Package Options

Mechanical Data (Package|Pins)

RVF|40
- MPQF268C

Thermal pad, mechanical data (Package|Pins)

RVF|40
- QFND333E

Orderable Information

6.6.44 (51h) OT_WARN_LIMIT

CMD Address	51h
Write Transaction:	Write Word
Read Transaction:	Read Word
Format:	SLINEAR11 per CAPABILITY
Phased:	Yes
NVM Back-up:	EEPROM
Updates:	On-the-fly

The OT_WARN_LIMIT command sets the temperature, in degrees Celsius, of the unit at which it must indicate an Overtemperature Warning alarm. The units are degrees C.

Upon triggering the overtemperature fault, the converter responds per the data byte below, and the following actions are taken:

Set the TEMP bit in the STATUS_BYTE.
Set the OTW bit in the STATUS_TEMPERATURE register.
Notify the host per PMBus 1.3.1 Part II specification, section 10.2.

Figure 6-50 (51h) OT_WARN_LIMIT Register Map

15	14	13	12	11	10	9	8
RW	RW	RW	RW	RW	RW	RW	RW
OTW_EXP					OTW_MAN

7	6	5	4	3	2	1	0
RW	RW	RW	RW	RW	RW	RW	RW
OTW_MAN

LEGEND: R/W = Read/Write; R = Read only

Table 6-61 Register Field Descriptions

Bit	Field	Access	Reset	Description
15:11	OTW_ EXP	RW	00000b	Linear format two’s complement exponent
10:0	OTW_ MAN	RW	NVM	Linear format two’s complement mantissa. Refer to the following text.

Attempts to write (51h) OT_WARN_LIMIT to any value outside those specified as valid will be considered invalid/unsupported data and cause the TPS546B24S 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.

Command Resolution and NVM Store/Restore Behavior

The (51h) OT_WARN_LIMIT command is implemented using the TPS546B24S internal telemetry system. As a result the value of this command can be programmed with very high resolution using the linear format. However, the TPS546B24S provides only limited NVM-backed options for this command. Following a power-cycle or NVM Store/Restore operation, the value will be restored to the nearest NVM supported value. The NVM supports values from 0°C to 160°C in 1°C steps. Programming OT_WARN_LIMIT to a value of 255°C will disable the OT_WARN_LIMIT function.

OT_WARN_LIMIT is used to provide hysteresis to OT_FAULT_LIMIT faults. If OT_WARN_LIMIT is programmed greater than OT_FAULT_LIMIT, including disabling OT_WARN_LIMIT with a value of 255°C, a default hysteresis of 20°C will be used instead.