TMP411CD datasheet(21/61 Pages) TI2

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Temperature data resulting from conversions within the default measurement range are represented in binary

form, as listed in the standard binary column of Table 7-1. Note that any temperature below 0°C results in a data

value of zero (00h). Likewise, temperatures above 127°C results in a value of 127 (7Fh). The device can be

set to measure over an extended temperature range by changing bit 2 of the Configuration Register 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 listed in the extended binary column in Table 7-1. This

configuration allows measurement of temperatures below 0°C. Having binary values in the range of –64°C to

191°C is possible, but most temperature-sensing diodes measure in the range of –55°C to 150°C. The TMP411/

TMP411D device is rated only for ambient local temperatures ranging from –40°C to 125°C. Parameters in the

Absolute Maximum Ratings table must be observed.

Table 7-1. Temperature Data Format (Local and Remote Temperature High Bytes)

TEMP (°C)

LOCAL AND REMOTE TEMPERATURE REGISTER HIGH BYTE VALUE (1°C RESOLUTION)

STANDARD BINARY

EXTENDED BINARY

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 1101

1011 1111

150

0111 1111

1101 0110

175

0111 1111

1110 1111

191

0111 1111

1111 1111

TMP411/TMP411D temperature sensor does not utilize 2's complement format to read in temperature values.

For this reason, the decode does not cast them into a signed type. The way that TMP411/TMP411D device

expresses a negative temperature is by enabling a RANGE bit which adds 64°C to the result. When RANGE is

enabled, the decode must subtract 64, causing a raw value of 0 to become -64°C output.

Table 7-2. 12-Bit Q4 Parameters

PARAMETER

VALUE

Bits

Resolution

0.0625

Range (+)

127.9375

Range (–)

First Byte Integer C

Yes

25˚C

0x1900

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TMP411, TMP411D

SBOS383E – DECEMBER 2006 – REVISED JULY 2025

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