EMC1063 Standard Microsystems Corp., EMC1063 Datasheet - Page 15

• Manufacturer Part Number: EMC1063
• Description: 1 Degree C Triple Temperature Sensor With Hotter Of Two Zones
• Manufacturer: Standard Microsystems Corp.

1°C Triple Temperature Sensor with Hotter of Two Zones
Datasheet
APPLICATION NOTE: When monitoring a substrate transistor or CPU diode and beta compensation is enabled, the
SMSC EMC1063
3.7
3.8
The External Diode 1 channel has the REC functionality disabled for use in monitoring an AMD K8
processor. The External Diode 2 channel defaults to REC functionality disabled but can be enabled by
writing to the Configuration 2 Register (see
as a diode-connected transistor as shown in
to minimize series resistance and improve accuracy
The EMC1063 default is for a diode ideality factor of 1.008 which is common for a 2N3904 diode and
for many processor transistors. When a diode or transistor is used that has a different ideality factor
value than 1.008 a temperature error is induced that is a linear function of temperature. Previous
solutions for this mismatch in ideality factor has been to supply a programmable offset to the
temperature reading which corrects the error at a single temperature but causes a residual error at all
other temperatures. The EMC1063 ideality factor register corrects this mismatch error at all
temperatures (see
The EMC1063 detects a fault if the DP pin is left floating or is shorted to VDD. In the case of a diode
fault, the corresponding status bit will be set and the output data will be set at 400h.
Programmable Ideality Factor
Diode Faults
Ideality Factor should not be adjusted. Beta Compensation automatically corrects for most
ideality errors.
Section
4.7).
DATASHEET
15
Section
Figure
4.5). If the External Diode 2 channel is connected
3.3, resistance error correction should be enabled
Revision 1.44 (04-14-08)