EMC2113 datasheet(46/85 Pages) SMSC

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

Datasheet

Revision 1.2 (10-08-09)

SMSC EMC2113

DATASHEET

The Pushed Temperature Registers store user programmed temperature values or temperature values

polled from one or more slave devices. This temperature 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 7.3, "Temperature Data Format".

7.5

PWM Input Duty Cycle Register

The PWM Input Duty Cycle register stores the calculated duty cycle of the signal on the PWM_IN pin.

The value is stored as an 7-bit PWM setting ranging from 0 to 127 and represents the duty cycle as

shown in Equation [1]. When used by the Fan Control Look Up Table (LUT), the 7-bit PWM Input Duty

Cycle register setting is used as a temperature input and compared against the programmed

thresholds.

7.6

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.

7.7

Ideality Factor Registers

Table 7.7 PWM Duty Cycle Register

ADDR

R/W

DEFAULT

0Fh

PWM Input

Duty Cycle

643216

00h

[1]

Table 7.8 TRIP_SET Voltage Register

ADDR

R/W

DEFAULT

10h

TRIP_SET

Voltage

750.0

375.0

187.5

93.75

46.88

23.43

11.72

5.86

FFh

Table 7.9 Ideality Factor Registers

ADDR

R/W

B7B6

B5B4

B3B2

B1B0

DEFAULT

11h

R/W

External Diode

1 Ideality

B012h

12h

R/W

External Diode

2 Ideality

B012h

13h

R/W

External Diode

3 Ideality

B012h

PWM Duty Cycle

VALUE

128

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