EMC1404 SMSC Corporation, EMC1404 Datasheet - Page 23

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

1°C Temperature Sensor with Beta Compensation
Datasheet
SMSC EMC1403/EMC1404
5.12
5.13
1
64
65
127
127.875
128
190
191
>= 191.875
TEMPERATURE (°C)
Anti-parallel Diode Connections
External Diode Connections
Note 5.1
Note 5.2
Note 5.3
Note 5.4
The EMC1404 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 EMC1403 can be configured to measure a CPU substrate transistor, a discrete 2N3904 thermal
diode, or an AMD processor diode. The diodes can be connected in a variety of ways as indicated in
Figure
The EMC1404 can be configured to measure a CPU substrate transistor, a discrete 2N3904 thermal
diode, or an AMD processor diode on the External Diode 1 channel only. The External Diode 2 and
External Diode 3 channels are configured to measure a pair of discrete anti-parallel diodes (shared on
pins DP2 and DN2). The supported configurations for the external diode channels are shown in
Figure
Table 5.3 EMC1403 and EMC1404 Temperature Data Format (continued)
5.6.
5.6.
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.
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
23
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
TO 191°C
Revision 1.16 (03-15-07)