EMC1212-AGZQ-TR Ver la hoja de datos (PDF) - SMSC -> Microchip

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EMC1212-AGZQ-TR

BBUS Compliant Dual Temperature Monitor with Beta Compensation

SMSC -> Microchip 

3.4

3.5

Beta Compensation

BBUS Compliant Dual Temperature Monitor with Beta Compensation

Datasheet

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.

Conversion Rate

The conversion rate is fixed to the value given in Section 2.2, but conversions may be halted by

periodically placing the device in standby as described in Section 3.1, "Power Modes".

Revision 1.1 (02-07-07)

10

DATASHEET

SMSC EMC1212

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