EMC1422 SMSC Corporation, EMC1422 Datasheet - Page 23

• Manufacturer Part Number: EMC1422
• Description: 1C Temperature Sensor
• Manufacturer: SMSC Corporation

1°C Temperature Sensor with Hardware Thermal Shutdown
Datasheet
SMSC EMC1422
5.12
1
64
65
127
127.875
128
190
191
>= 191.875
i.e. CPU substrate PNP
TEMPERATURE (°C)
substrate transistor
Typical remote
Local Ground
External Diode Connections
Note 5.1
Note 5.2
Note 5.3
Note 5.4
The EMC1422 is hard-wired to measure a specific kind of thermal diode and none of the measurement
options can be changed by software.
In default mode, all temperatures < 0°C will be reported as 0°C.
In the extended range, all temperatures < -64°C will be reported as -64°C.
For the default range, all temperatures > +127.875°C will be reported as +127.875°C.
For the extended range, all temperatures > +191.875°C will be reported as +191.875°C.
Table 5.3 EMC1422 Temperature Data Format (continued)
000 0000 1000
010 0000 0000
010 0000 1000
011 1111 1000
011 1111 1111
011 1111 1111
Note 5.3
011 1111 1111
011 1111 1111
011 1111 1111
DN
DP
to
to
DEFAULT RANGE 0°C TO 127°C
Figure 5.7 Diode Configurations
discrete PNP transistor
Typical remote
i.e. 2N3906
DATASHEET
Figure 5.7
23
shows the different diode configurations.
DP
DN
to
to
010 0000 1000
100 0000 0000
100 0000 1000
101 1111 1000
101 1111 1111
110 0000 0000
111 1111 0000
111 1111 1000
111 1111 1111
Note 5.4
EXTENDED RANGE RANGE -64°C
discrete NPN transistor
Typical remote
i.e. 2N3904
TO 191°C
Revision 1.16 (03-15-07)
DP
DN
to
to