TMP126 datasheet(17/45 Pages) TI

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8.5 Programming

8.5.1 Temperature Data Format

Temperature data is represented by a 14-bit, two's complement word with an LSB (Least Significant Bit) equal to

0.03125 °C. The last two bits of the register are always 00b.

Table 8-1. 14-Bit Temperature Data Format

Temperature

Digital Output

Binary

Hex

175 °C

0100 1011 0000 0000

5780

150 °C

0100 1011 0000 0000

4B00

125 °C

0011 1110 1000 0000

3E80

25 °C

0000 1100 1000 0000

0C80

0.03125 °C

0000 0000 0000 0100

0004

0 °C

0000 0000 0000 0000

0000

−0.03125 °C

1111 1111 1111 1100

FFFC

−25 °C

1111 0011 1000 0000

F380

−40 °C

1110 1100 0000 0000

EC00

−55 °C

1110 0100 1000 0000

E480

The first data byte is the most significant byte with most significant bit first, permitting only as much data as

necessary to be read to determine temperature condition. For example, if the first four bits of the temperature

data indicate an over temperature condition, the host controller could immediately abort communication and take

action to remedy the excessive temperature condition.

8.5.2 Serial Bus Interface

Figure 8-9 shows an overview of the TMP126 protocol. The /CS pin must be taken low between communication

transactions. Data is clocked out on the falling edge of the serial clock (SCLK), while data is clocked in on the

rising edge of SCLK. The 16-bit write words are latched to the respective registers after the 16th rising clock

edge including during burst write mode. If a software reset is enabled, the device will immediately reset after the

16th rising clock edge and will not respond to SPI communication until a new falling edge of the CS is observed.

If a software reset is triggered during burst write, any data after the configuration register write will be ignored.

The SIO buffer is tri-state during reset.

Each transaction with the TMP126 will consist of a command word, followed by the data block, and the optional

CRC that is enabled in the command word.

Host R/W

SI/O

SCLK

16-bit

Host R/W

16-bit

Command

CRC

16-bit

Figure 8-9. TMP126 Communication Overview

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TMP126

SNIS209 – JULY 2021

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