TMP431 datasheet(12/47 Pages) TI1

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TMP431, TMP432

SBOS441G – SEPTEMBER 2009 – REVISED DECEMBER 2015

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8.3 Feature Description

8.3.1 Temperature Measurement Data

Temperature measurement data are taken over a default range of 0°C to 127°C for both local and remote

locations. However, measurements from –55°C to 150°C can be made both locally and remotely by reconfiguring

the TMP43x for the extended temperature range, as described in this section. Temperature data resulting from

conversions within the default measurement range are represented in binary form, as shown in Table 1,

Standard Binary column. Note that any temperature below 0°C results in a data value of zero (00h). Likewise,

temperatures above 127°C result in a value of 127 (7Fh). The device can be set to measure over an extended

temperature range by changing bit 2 of Configuration Register 1 from low to high. The change in measurement

range and data format from standard binary to extended binary occurs at the next temperature conversion.

For data captured in the extended temperature range configuration, an offset of 64 (40h) is added to the

standard binary value, as shown in Table 1, Extended Binary column. This configuration allows measurement of

temperatures as low as –64°C, and as high as 191°C; however, most temperature-sensing diodes only measure

with the range of –55°C to 150°C.

Additionally, the TMP43x are rated only for ambient local temperatures ranging from –40°C to 125°C.

Parameters in Absolute Maximum Ratings must be observed.

Both local and remote temperature data use two bytes for data storage. The high byte stores the temperature

with 1°C resolution. The second or low byte stores the decimal fraction value of the temperature and allows a

higher measurement resolution, as shown in Table 2.

The measurement resolution for both the local and remote channels is 0.0625°C, and cannot be adjusted.

Table 1. Temperature Data Format (Local and Remote Temperature High Bytes)

LOCAL/REMOTE TEMPERATURE REGISTER

HIGH BYTE VALUE (1°C RESOLUTION)

TEMP (°C)

STANDARD BINARY(1)

EXTENDED BINARY(2)

BINARY

HEX

BINARY

HEX

−64

0000 0000

−50

0000 0000

0000 1110

−25

0000 0000

0010 0111

0000 0000

0100 0000

0000 0001

0100 0001

0000 0101

0100 0101

0000 1010

0100 1010

0001 1001

0101 1001

0011 0010

0111 0010

0100 1011

1000 1011

100

0110 0100

1010 0100

125

0111 1101

1011 1101

127

0111 1111

1011 1111

150

0111 1111

1101 0110

175

0111 1111

1110 1111

191

0111 1111

1111 1111

(1)

Resolution is 1°C/count. Negative numbers are represented in twos complement format.

(2)

Resolution is 1°C/count. All values are unsigned with a –64°C offset.

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