EMC2103 datasheet(46/85 Pages) MICROCHIP

46 / 85 page

RPM-Based Fan Controller with Hardware Thermal Shutdown

Datasheet

DS0005250A-page 46

 2013 Microchip Technology Inc.

The Pushed Temperature Registers store user programmed temperature values that can be used by

the look-up table to update the fan control algorithm. Data written in these registers is not compared

against any limits and must match the data format shown in Table 6.3.

6.5

TRIP_SET Voltage Register

The TRIP_SET Voltage Register stores data that is measured on the TRIP_SET Voltage input. Each

bit weight represents mV of resolution so that the final voltage can be determined by adding the

weighting of the set bits together.

6.6

Ideality Factor Registers

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

The External Diode 3 channel will use the settings for the External Diode 2 channel.

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 6.10 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.

Table 6.7 TRIP_SET Voltage Register

ADDR

R/W

DEFAULT

10h

R/W

TRIP_SET

Voltage

750.0

375.0

187.5

93.75

46.88

23.43

11.72

5.89

FFh

Table 6.8 Ideality Factor Registers

ADDR

R/W

DEFAULT

11h

R/W

External

Diode 1

Ideality

12h

12h **

R/W

External

Diode 2

Ideality **

12h

Table 6.9 Ideality Factor Look-Up Table

SETTING

FACTOR

10h

1.0053

11h

1.0066

12h

1.0080

13h

1.0093

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