EMC1187 datasheet(24/47 Pages) MICROCHIP

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Triple Channel 1°C Temperature Sensor with Hardware Thermal Shutdown and 1.8V SMBus Communications

Datasheet

Revision 1.0 (07-11-13)

SMSC EMC1187

DATASHEET

5.11

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 temperature 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 register. All other bits of the low byte register are set to zero.

The EMC1187 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

equivalent to a temperature higher than +127°C.

Table 5.3 shows the default and extended range formats.

Table 5.3 Temperature Data Format

TEMPERATURE (°C)

DEFAULT RANGE 0°C TO 127°C

EXTENDED RANGE -64°C TO 191°C

Diode Fault

000 0000 0000

-64

000 0000 0000

-1

000 0000 0000

001 1111 1000

000 0000 0000

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

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

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