Datasheet

20 Atmel AT30TS00 [Preliminary]
8585B−SEEPR−8/10
6.7.2. Temperature Register Format
This section will clarify the temperature register format and temperature bit value assignments used for
temperature for the following registers: Upper Alarm Trip, Lower Alarm Trip, Critical Alarm Trip and Temperature
Data. The temperatures expressed in the Upper Alarm Trip, Lower Alarm Trip, Critical Alarm Trip and temperature
registers are indicated in two’s complement format. In each of the trip registers, bits 12 through bit two are used
for temperature settings, or in the case of the temperature register, holds the internal temperature measurement
with bits 12 through bit one allowing 0.125ºC resolution.
Table 6-15 indicates the temperature register’s assigned bit values used for temperature. Table 6-16 below shows
examples for temperature register bit values for various temperature readings.
Table 6-15. Temperature Register Format
Bit Position 12 11 10 9 8 7 6 5 4 3 2 1 0
Bit Value
SIGN 128°C 64°C 32°C 16°C 8°C 4°C 2°C 1°C 0.5°C 0.25°C 0.125°C X
Table 6-16. Temperature Register Examples
Temperature Register Value Examples
Temperature Binary (Bit15 – Bit0)
+125°C xxx0 0111 1101 00xx
+99.75°C xxx0 0110 0011 11xx
+85°C xxx0 0101 0101 00xx
+39°C xxx0 0010 0111 00xx
+15.75°C xxx0 0000 1111 11xx
+0.25°C xxx0 0000 0000 01xx
0°C xxx0 0000 0000 00xx
-0.25°C xxx1 1111 1111 11xx
-1°C xxx1 1111 1110 00xx
-20°C xxx1 1110 1100 00xx