EMC1212-AGZG-TR SMSC, EMC1212-AGZG-TR Datasheet - Page 10

• Manufacturer Part Number: EMC1212-AGZG-TR
• Description: Board Mount Temperature Sensors BBUS CMPLINT DUAL TEMP MNTR/BETA COMP
• Manufacturer: SMSC

Specifications of EMC1212-AGZG-TR

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Revision 1.1 (02-07-07)
3.4
3.5
The beta compensation circuitry corrects for beta variation in PNP substrate transistors used as
thermal diodes. The EMC1212 is designed to work with 65nm processors manufactured by Intel.
For discrete transistors connected with collector to base as a diode, the beta is generally sufficiently
high to make this relative beta variation very small (a variation of 10% from low current to high current
when beta = 50 contributes approximately 0.25°C error at 100°C). However, for substrate transistors
where the VBE junction is used for temperature measurement and the collector is tied to the substrate,
the proportional beta variation causes more error (a variation of 10% from low current to high current
when beta = 0.5 contributes approximately 8.25°C at 100°C).
Because the beta compensation circuit is designed to work with PNP substrate transistors, the
EMC1212 should not be used with diode-connected transistors (such as the 2N3904) or CPUs that
implement the thermal diode as a two-terminal diode. The beta compensation circuit is not present in
the EMC1202 availabe from SMSC, and this device is an excellent companion to AMD CPUs.
The conversion rate is fixed to the value given in
periodically placing the device in standby as described in
Beta Compensation
Conversion Rate
DATASHEET
BBUS Compliant Dual Temperature Monitor with Beta Compensation
10
Section
Section 3.1, "Power
2.2, but conversions may be halted by
Modes".
SMSC EMC1212
Datasheet