EMC1424 SMSC Corporation, EMC1424 Datasheet - Page 25

• Manufacturer Part Number: EMC1424
• Description: (EMC1423 / EMC1424) Temperature Sensor
• Manufacturer: SMSC Corporation

1°C Temperature Sensor with Hardware Thermal Shutdown
Datasheet
SMSC EMC1423/EMC1424
5.13
5.14
Diode Fault
-1
0
0.125
1
64
65
127
127.875
128
190
191
>= 191.875
-64
TEMPERATURE (°C)
Anti-parallel Diode Connections
External Diode Connections
Table 5.4
Note 5.1
Note 5.2
Note 5.3
Note 5.4
The EMC1424 supports reading two external diodes on the same set of pins (DP2, DN2). These
diodes are connected as shown in
diodes will be reverse biased by a V
only discrete thermal diodes (such as a 2N3904) are recommended to be placed on these pins.
The EMC1423 is hard-wired to measure a specific type of thermal diode on the External Diode 1
channel only (DP1 and DN1 pins). The External Diode 2 channel can be configured to measure a CPU
substrate transistor, a discrete thermal diode such as a 2N3904, or an AMD processor diode. The
supported configurations for the external diode channels are shown in
The EMC1424 is hard-wired to measure a specific type of thermal diode on the External Diode 1
channel only (DP1 and DN1 pins). The External Diode 2 and External Diode 3 channel are configured
shows the default and extended range formats.
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 5.4 EMC1423 and EMC1424 Temperature Data Format
000 0000 0000
000 0000 0000
000 0000 0000
000 0000 0000
Note 5.1
000 0000 0001
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
DEFAULT RANGE 0°C TO 127°C
Figure
DATASHEET
BE
voltage (approximately 0.7V). Because of this reverse bias,
5.2. Due to the anti-parallel connection of these diodes, both
25
000 0000 0000
000 0000 0000
Note 5.2
001 1111 1111
010 0000 0000
010 0000 0001
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
Figure
TO 191°C
5.8.
Revision 1.16 (03-15-07)