EMC1404 SMSC Corporation, EMC1404 Datasheet - Page 22

• Manufacturer Part Number: EMC1404
• Description: (EMC1403 / EMC1404) Temperature Sensor
• Manufacturer: SMSC Corporation

Revision 1.16 (03-15-07)
5.11
Diode Fault
-1
0
0.125
-64
TEMPERATURE (°C)
Substrate
PNP
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 EMC1403 and EMC1404 have 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
I
LOW
Resistance
Correction
shows the default and extended range formats.
Error
Figure 5.5 Block Diagram of Temperature Monitoring Circuit
Table 5.3 EMC1403 and EMC1404 Temperature Data Format
000 0000 0000
000 0000 0000
000 0000 0000
000 0000 0000
Note 5.1
000 0000 0001
DEFAULT RANGE 0°C TO 127°C
I
HIGH
DN
DP
DATASHEET
Aliasing
Filter
22
Anti-
1°C Temperature Sensor with Beta Compensation
000 0000 0000
000 0000 0000
Note 5.2
001 1111 1111
010 0000 0000
010 0000 0001
EXTENDED RANGE RANGE -64°C
TO 191°C
ADC
SMSC EMC1403/EMC1404
ΔΣ
Datasheet