MCP9902 datasheet(15/50 Pages) MICROCHIP

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 2015-2016 Microchip Technology Inc.

DS20005382C-page 15

MCP9902/3/4

4.15

Temperature Measurement

Results and Data

The temperature measurement results are stored in

the internal and external temperature registers. These

are then compared with the values stored in the high

and low limit registers. Both external and internal tem-

perature measurements are stored in 11-bit format

with the eight (8) most significant bits stored in a high

byte register and the three (3) least significant bits

stored in the three (3) MSB positions of the low byte

zero.

The MCP9902/3/4 has two selectable temperature

ranges. The default range is from 0°C to +127°C and

the temperature is represented as binary number able

to report a temperature from 0°C to +127.875°C in

0.125°C steps.

The extended range is an extended temperature

range from -64°C to +191°C. The data format is a

binary number offset by +64°C. The extended range is

used to measure temperature diodes with a large

known offset (such as AMD processor diodes) where

the diode temperature plus the offset would be equiva-

lent to a temperature higher than +127°C.

Table 4-7 shows the default and extended range

formats.

TABLE 4-7:

TEMPERATURE DATA

FORMAT

Temperature

(°C)

Default Range

0°C to +127°C

Extended Range

-64°C to +191°C

Diode Fault 000 0000 0000 000 0000 0000

-64

000 0000 0000 000 0000 0000

(Note 2)

-1

000 0000 0000 001 1111 1000

000 0000 0000

(Note 1)

010 0000 0000

0.125

000 0000 0001 010 0000 0001

000 0000 1000 010 0000 1000

010 0000 0000 100 0000 0000

010 0000 1000 100 0000 1000

127

011 1111 1000 101 1111 1000

127.875

011 1111 1111 101 1111 1111

128

011 1111 1111

(Note 3)

110 0000 0000

190

011 1111 1111 111 1111 0000

191

011 1111 1111 111 1111 1000

≥ 191.875

011 1111 1111 111 1111 1111

(Note 4)

Note 1:

In default mode, all temperatures < 0°C

will be reported as 0°C

In the extended range, all temperatures

less than -64°C will be reported as -64°C.

For the default range, all temperatures

greater than +127.875°C will be reported

as +127.875°C.

For the extended range, all temperatures

greater than +191.875°C will be reported

as +191.875°C.

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