EMC1212 View Datasheet(PDF) - SMSC -> Microchip

Part Name

Description

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EMC1212

BBUS Compliant Dual Temperature Monitor with Beta Compensation

SMSC -> Microchip 

BBUS Compliant Dual Temperature Monitor with Beta Compensation

Datasheet

Table 3.1 EMC1212 Temperature Data Format (continued)

TEMPERATURE (°C)

1

63

64

65

128

191

191.875

2’S COMPLEMENT FORMAT

BINARY

110 0000 1000

111 1111 1000

000 0000 0000

000 0000 1000

010 0000 0000

011 1111 1000

011 1111 1111

608h

7F8h

000h

008h

200h

3F8h

3FFh

HEX

The external diode supported by the EMC1212 must be connected as shown in Figure 3.3. The

EMC1202 availabe from SMSC will support other diode configurations.

to

DP

to

DN

3.3

Local Ground

Typical remote

substrate transistor

i.e. CPU substrate PNP

Figure 3.3 External Diode Configuration

Resistance Error Correction

The EMC1212 includes resistance error correction implemented in the analog front end of the chip.

Resistance error correction is an automatic feature that eliminates the need to characterize and

compensate for the series resistance in the external diode lines.

When using a temperature sensor that does not include resistance error correction, voltage developed

across the parasitic resistance in the remote diode path produces an error in the reported temperature.

The error introduced by this resistance is approximately 0.7°C per ohm. Sources of series resistance

are PCB trace resistance, on die (i.e. on the processor) metal resistance, bulk resistance in the base

and emitter of the temperature transistor.

SMSC EMC1212

9

DATASHEET

Revision 1.1 (02-07-07)

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