SLUSEJ1 Data sheet

SLUSEJ1A December 2021 – November 2023 TPSM8D6C24

PRODUCTION DATA

Package Options

Mechanical Data (Package|Pins)

MOW|59

Thermal pad, mechanical data (Package|Pins)

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 Backup:	EEPROM
Updates:	On-the-fly

The OT_WARN_LIMIT command sets the temperature, in degrees Celsius, of the unit, at which, it indicates an overtemperature warning alarm. The units are degrees C.

Upon triggering the overtemperature fault, the converter responds per the following data byte, 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 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.

Command Resolution and NVM Store or Restore Behavior

The (51h) OT_WARN_LIMIT command is implemented using the TPSM8D6C24 internal telemetry system. As a result, the value of this command can be programmed with very high resolution using the linear format. However, the TPSM8D6C24 provides only limited NVM-backed options for this command. Following a power-cycle or NVM Store or Restore operation, the value is 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 disables 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 is used instead.