1°C Triple Temperature Sensor with Resistance Error Correction & Hotter of Two Zones

Datasheet

SMSC EMC1053

13

Revision 1.37 (02-05-07)

DATASHEET

Figure 3.2 shows a block diagram of the temperature measurement circuit. The negative terminal for

the remote temperature diode, DN, is internally biased with a forward diode voltage referenced to

ground.

The external diodes in the EMC1053 are compatible with a broad range of thermal diodes that may

be connected as shown in Figure 3.3.

Figure 3.2 Block Diagram of Temperature Monitoring Circuit

Figure 3.3 External Diode Configurations

DP

DN

Anti-

Aliasing

Filter

ΔΣ

ADC

Resistance

Error

Correction

Substrate

PNP

I

LOW

I

HIGH

Local Ground

to

DP

Typical remote

substrate transistor

i.e. CPU substrate PNP

Typical remote

discrete NPN transistor

i.e. 2N3904

to

DN

to

DP

to

DN

Typical remote

discrete PNP transistor

i.e. 2N3906

to

DP

to

DN