PC87365 datasheet(172/215 Pages) NSC

172 / 215 page

10.0 Temperature Sensor (TMS) (Continued)

172

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10.2.5

Temperature Data Format

Temperature data is stored in the RDCHT, CHTH, CHTL and CHOTL registers as an 8-bit, 2’s complement word with a Least

Significant Bit (LSB) equal to 1

° C.

Table 51. Temperature Formats

Figure 36. Temperature-to-Digital Transfer Function (Non-linear scale for clarity)

10.2.6

Standby Mode

Standby mode is enabled by setting the Standby Mode bit in the TMSCFG register to 1 (default). Standby mode disables

the conversion process to reduce power supply current. During standby mode, all registers retain their values and can be

accessed by software (as usual).

10.2.7

Diode Fault Detection

At the beginning of each conversion, the TMS goes through a diode fault detection sequence. If the DxP input is shorted to VDD

or floating, the temperature reading will be +127

° C and the Open bit of the TCHCFST register is set, which activates the

ALERT and OTS outputs on completion of a conversion. If DxP is shorted to GND or DxN, the temperature reading is O

° C

and the Temperature Low Limit bit of the TCHCFST register is not set.

Temperature

(

°C)

Digital Output

Binary

Hex

+125

0111 1101

7Dh

+25

0001 1001

19h

0000 0001

01h

0000 0000

00h

-1

1111 1111

FFh

-25

1110 0111

E7h

0001,1001

0000,0001

0111,1101

1111,1111

1110,0111

1100,1001

+125

°C

Temperature

+25

°C

0000,0000

°C

-25

°C

-55

°C

-1

°C

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