1°C Temperature Sensor with Hardware Thermal Shutdown
Datasheet
Table 5.3 EMC1422 Temperature Data Format (continued)
EXTENDED RANGE RANGE -64°C
TO 191°C
TEMPERATURE (°C)
DEFAULT RANGE 0°C TO 127°C
64
010 0000 0000
010 0000 1000
011 1111 1000
011 1111 1111
100 0000 0000
100 0000 1000
101 1111 1000
101 1111 1111
110 0000 0000
65
127
127.875
128
011 1111 1111
Note 5.3
190
011 1111 1111
011 1111 1111
011 1111 1111
111 1111 0000
111 1111 1000
191
>= 191.875
111 1111 1111
Note 5.4
Note 5.1 In default mode, all temperatures < 0°C will be reported as 0°C.
Note 5.2 In the extended range, all temperatures < -64°C will be reported as -64°C.
Note 5.3 For the default range, all temperatures > +127.875°C will be reported as +127.875°C.
Note 5.4 For the extended range, all temperatures > +191.875°C will be reported as +191.875°C.
5.12
External Diode Connections
The EMC1422 is hard-wired to measure a specific kind of thermal diode and none of the measurement
options can be changed by software. Figure 5.7 shows the different diode configurations.
to
to
to
DP
DP
DP
to
DN
to
to
DN
DN
Local Ground
Typical remote
substrate transistor
i.e. CPU substrate PNP
Typical remote
discrete PNP transistor
i.e. 2N3906
Typical remote
discrete NPN transistor
i.e. 2N3904
Figure 5.7 Diode Configurations
SMSC EMC1422
Revision 1.24 (02-05-08)
DATA2S3HEET
SMSC [ SMSC CORPORATION ]
