8.3.6.1 Converting from Temperature to Digital Codes

For positive temperatures:

Twos complement is not performed on positive numbers. Therefore, simply convert the number to binary code in a 12-bit, left justified format with the MSB = 0 to denote the positive sign.

Example: 50°C / (0.125°C/count) = 400 = 190h = 0001 1001 0000

For negative temperatures:

Generate the twos complement of a negative number by complementing the absolute binary number and adding 1. Then, denote the negative sign with the MSB = 1.

Example: |–25°C| / (0.125/count) = 200 = 0C8h = 0000 1100 1000

Twos complement format: 1111 0011 01111 + 1 = 1111 0011 1000