STTS2004 datasheet(26/58 Pages) STMICROELECTRONICS

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Temperature sensor registers

STTS2004

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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 13. 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 for the default resolution. 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 019C h represents 25.75 °C

a value of 07C0 h represents 124 °C, and

a value of 1E74 h represents –24.75 °C

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

STTS2004 supports programmable resolutions (9-12 bits) which is 0.5 to 0.0625 °C/LSB.

The default is 0.25 °C/LSB (10 bits) programmable.

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

by the event output status.

Table 13. Temperature register format

Sign

MSB

LSB(1)

Bit

1(2)

Bit

0(3)

Flag bit

Sign 128 64 32 16

1 0.5

0.25

0.125 0.0625 °C/LSB

Above

critical

input(4)

Above

alarm

window(4)

Below

alarm

window(4)

Temperature (default - 10 bit)

Flag bits

Example hex value of 07C0 corresponds to 124 °C (10-bit)

07C0 h

Flag bits

Example hex value of 1EC0 corresponds to –20 °C (10-bit)

1EC0 h

1. Bit 2 is LSB for default 10-bit mode.

2. Depending on status of the resolution register, bit 1 may display 0.125 °C value.

3. Depending on status of the resolution register, bit 0 may display 0.0625 °C value.

4. See Table 15 for explanation.

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