Datasheet

TMP431
TMP432
www.ti.com SBOS441F –SEPTEMBER 2009–REVISED AUGUST 2013
TEMPERATURE MEASUREMENT DATA For data captured in the extended temperature range
configuration, an offset of 64 (40h) is added to the
Temperature measurement data are taken over a
standard binary value, as shown in Table 1, Extended
default range of 0°C to +127°C for both local and
Binary column. This configuration allows
remote locations. However, measurements from
measurement of temperatures as low as –64°C, and
–55°C to +150°C can be made both locally and
as high as +191°C; however, most temperature-
remotely by reconfiguring the TMP431/32 for the
sensing diodes only measure with the range of –55°C
extended temperature range, as described in this
to +150°C.
section. Temperature data resulting from conversions
within the default measurement range are Additionally, the TMP431/32 are rated only for
represented in binary form, as shown in Table 1, ambient local temperatures ranging from –40°C to
Standard Binary column. Note that any temperature +125°C. Parameters in the Absolute Maximum
below 0°C results in a data value of zero (00h). Ratings table must be observed.
Likewise, temperatures above +127°C result in a
Both local and remote temperature data use two
value of 127 (7Fh). The device can be set to measure
bytes for data storage. The high byte stores the
over an extended temperature range by changing bit
temperature with 1°C resolution. The second or low
2 of Configuration Register 1 from low to high. The
byte stores the decimal fraction value of the
change in measurement range and data format from
temperature and allows a higher measurement
standard binary to extended binary occurs at the next
resolution, as shown in Table 2.
temperature conversion.
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)
STANDARD BINARY
(1)
EXTENDED BINARY
(2)
TEMP (°C) BINARY HEX BINARY HEX
−64 0000 0000 00 0000 0000 00
−50 0000 0000 00 0000 1110 0E
−25 0000 0000 00 0010 0111 27
0 0000 0000 00 0100 0000 40
1 0000 0001 01 0100 0001 41
5 0000 0101 05 0100 0101 45
10 0000 1010 0A 0100 1010 4A
25 0001 1001 19 0101 1001 59
50 0011 0010 32 0111 0010 72
75 0100 1011 4B 1000 1011 8B
100 0110 0100 64 1010 0100 A4
125 0111 1101 7D 1011 1101 BD
127 0111 1111 7F 1011 1111 BF
150 0111 1111 7F 1101 0110 D6
175 0111 1111 7F 1110 1111 EF
191 0111 1111 7F 1111 1111 FF
(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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