TMP411 datasheet(21/60 Pages) TI2

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offset of 64 (40h) is added to the standard binary value, as listed in the extended binary column of Table 7-1.

This configuration allows measurement of temperatures below 0°C. Note that binary values corresponding to

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

only measure within the range of –55°C to 150°C. Additionally, the TMP411-Q1 and TMP411D-Q1 devices are

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/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 1111

1011 1111

150

0111 1111

1101 0110

175

0111 1111

1110 1111

191

0111 1111

1111 1111

The TMP411-Q1 and TMP411D-Q1 devices' 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 the

TMP411-Q1 and TMP411D-Q1 devices express 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

Table 7-3. 12-Bit Q4 Bit Values in °C

—

0.5

0.25

0.125 0.0625

—

1/2

1/4

1/8

1/16

—

2-1

2-2

2-3

2–4

—

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TMP411-Q1, TMP411D-Q1

SBOS527G – DECEMBER 2010 – REVISED SEPTEMBER 2025

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