STTS424E02BDA3F datasheet(24/51 Pages) STMICROELECTRONICS

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Temperature sensor registers

STTS424E02

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4.3

Temperature register (read-only)

This 16-bit, Read-only register stores the temperature measured by the internal band gap

TS as shown inTable 12. The STTS424E02 meets the JEDEC mandatory 0.25°C resolution

requirement. When reading this register, the MSBs (Bit 15 to Bit 8) are read first, and then

the LSBs (Bit 7 to Bit 0) are read. The result is the current-sensed temperature. The data

format is 2s complement with one LSB = 0.25°C. The MSB has a 128°C resolution.

The Trip status bits represent the internal temperature trip detection, and are not affected by

the status of the Event or Configuration bits (e.g. Event output control or Clear Event). If

neither of the Above or Below values are set (i.e. both are 0), then the Temperature is

exactly within the user-defined alarm window boundaries.

4.3.1

Temperature format

The 16-bit value used in the Trip Point Set and Temperature Read-back registers is 2s

complement, with the LSB equal to 0.0625°C (see Table 13). For example:

a value of 019Ch represents 25.75°C,

a value of 07C0h represents 124°C, and

a value of 1E74h represents –24.75°C

All unused resolution bits are set to zero. The MSB will have a resolution of 128°C. The

STTS424E02 supports the 0.25°C/LSB only.

The upper 3 bits indicate Trip status based on the current temperature, and are not affected

by the Event output status.

Table 12.

Temperature register format

Sign

MSB

LSB

Bit

Above

critical

input(1)

See Table 13 for explanation.

Above

alarm

window(1)

Below

alarm

window(1)

Temperature

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