EMC1813 datasheet(23/102 Pages) MICROCHIP

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default for EMC1813. This is the default for EMC1814 for External Diode 1 only and it is disabled and

cannot be enabled for External Diode 2 or 3. If the auto-detection circuitry is disabled, these bits will

determine the beta configuration setting that is used for their respective channels.

It is recommended to be cautious when setting the BETA(N)<2:0> bits when the auto-detection circuitry

is disabled. If the beta compensation factor is set at a beta value that is higher than the transistor beta,

the circuit may generate measurement errors. When measuring a discrete thermal diode (such as

2N3904) or a CPU diode that functions like a discrete thermal diode (such as an CPU/GPU processor

diode), the BETA(N)<2:0> bits should be set to 111b.

Table 5-6. CPU Beta Values

DI_BETA<3:0>

Minimum Beta

0.050

0.066

0.087

0.114

0.150

0.197

0.260

0.342

0.449

0.591

0.778

1.024

1.348

1.773

2.333

Diode Mode

5.14

Resistance Error Correction (REC)

Parasitic resistance, in series with the external diodes, limits the accuracy obtainable from temperature

measurement devices. The voltage developed across this resistance by the switching diode currents

causes the temperature measurement to read higher than the true temperature. Contributors to 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. Typically, the error caused by series resistance is

+0.7°C/Ω. The EMC1812/13/14/15/33 devices automatically correct up to 100 Ω of series resistance.

Multi-Channel Low-Voltage Remote Di...

System Block Diagram

Datasheet

DS20005751A-page 23

EMC1813 Datasheet(PDF) 23 Page - Microchip Technology