TMP411CD datasheet(22/61 Pages) TI2

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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

/* 12-bit format will have 4 bits discarded by right shift

q4 is 0.062500 resolution

the following bytes represent 24.5C

there is no cast into signed type */

uint8_t byte1 = 0x18;

uint8_t byte2 = 0x80;

float f = ((byte1 << 8 | byte2) >> 4) * 0.0625f;

int mC = ((byte1 << 8 | byte2) >> 4) * 1000 >> 4;

int C = byte1;

Note

Whenever changing between standard and extended temperature ranges, be aware that the

temperatures stored in the temperature limit registers are NOT automatically reformatted to

correspond to the new temperature range format. These temperature limit values must be

reprogrammed in the appropriate binary or extended binary format.

Local and remote temperature data uses two bytes for data storage. The high byte stores the temperature with

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

higher measurement resolution, as listed in Table 7-4. The measurement resolution for the remote channel is

0.0625°C, and is not adjustable. The measurement resolution for the local channel is adjustable, and can be set

for either 0.5°C, 0.25°C, 0.125°C, or 0.0625°C by setting the RES1 and RES0 bits listed in Table 8-4.

Table 7-4. Decimal Fraction Temperature Data Format (Local and Remote Temperature Low Bytes)

TEMP

(°C)

REMOTE TEMPERATURE

LOCAL TEMPERATURE REGISTER LOW BYTE VALUE

0.0625°C RESOLUTION

0.5°C RESOLUTION

0.25°C RESOLUTION

0.125°C RESOLUTION

0.0625°C RESOLUTION

STANDARD AND

EXTENDED BINARY

HEX

STANDARD AND

EXTENDED BINARY

HEX

STANDARD

AND EXTENDED

BINARY

HEX

STANDARD AND

EXTENDED BINARY

HEX

STANDARD AND

EXTENDED BINARY

HEX

0.0000

0000 0000

0.0625

0001 0000

0000 0000

0001 0000

0.1250

0010 0000

0000 0000

0010 0000

0.1875

0011 0000

0000 0000

0010 0000

0011 0000

0.2500

0100 0000

0000 0000

0100 0000

0.3125

0101 0000

0000 0000

0100 0000

0101 0000

0.3750

0110 0000

0000 0000

0100 0000

0110 0000

0.4375

0111 0000

0000 0000

0100 0000

0110 0000

0111 0000

0.5000

1000 0000

0.5625

1001 0000

1000 0000

1001 0000

0.6250

1010 0000

1000 0000

1010 0000

0.6875

1011 0000

1000 0000

1010 0000

1011 0000

0.7500

1100 0000

1000 0000

1100 0000

0.8125

1101 0000

1000 0000

1100 0000

1101 0000

0.8750

1110 0000

1000 0000

1100 0000

1110 0000

0.9375

1111 0000

1000 0000

1100 0000

1110 0000

1111 0000

TMP411, TMP411D

SBOS383E – DECEMBER 2006 – REVISED JULY 2025

www.ti.com

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