EMC2113 datasheet(47/88 Pages) MICROCHIP

47 / 88 page

RPM-Based Fan Controller with Multiple Temperature Zones & Hardware Thermal Shutdown

Datasheet

 2013 Microchip Technology Inc.

DS20005251A-page 47

These registers store the ideality factors that are applied to the external diodes.

Beta Compensation and Resistance Error Correction automatically correct for most diode ideality

errors, therefore it is not recommended that these settings be updated without consulting Microchip.

For CPU substrate transistors that require the BJT transistor model, the ideality factor behaves slightly

differently than for discrete diode-connected transistors. Refer to Table 7.11, "Substrate Diode Ideality

Factor Look-Up Table (BJT Model)" when using a CPU substrate transistor.

Only the lower three bits can be written. Writing to any other bit will be ignored.

The Ideality Factor Registers are software locked.

APPLICATION NOTE: When measuring a 65nm Intel CPUs, the Ideality Setting should be the default 12h. When

measuring 45nm Intel CPUs, the Ideality Setting should be 15h.

Table 7.10 Ideality Factor Look-Up Table

SETTING

FACTOR

10h

1.0053

11h

1.0066

12h

1.0080

13h

1.0093

14h

1.0106

15h

1.0119

16h

1.0133

17h

1.0146

Table 7.11 Substrate Diode Ideality Factor Look-Up Table (BJT Model)

SETTING

FACTOR

10h

0.9973

11h

0.9986

12h

1.0000

13h

1.0013

14h

1.0026

15h

1.0039

16h

1.0053

17h

1.0066

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