EMC2113 datasheet(64/85 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 Fan Spin Up Configuration Register is software locked.

7.28

Fan Step Register

The Fan Step Register, along with the Update Time, control the ramp rate of the fan driver response.

The value of the registers represents the maximum step size each fan driver will take between update

times (see Section 7.24, "Fan Configuration 1 Register").

All modes of operation have the options to use the Fan Step Register (and update times) for ramp rate

control based on the Fan Configuration 2 Register settings. The Fan Speed Control Algorithm will

always use the Fan Step Register settings (but see application note below).

The Fan Step Register is software locked.

7.29

Fan Minimum Drive Register

The Fan Minimum Drive Register stores the minimum drive setting for the RPM-based Fan Speed

Control Algorithm. This register is not used if the FSC is not active. The RPM-based Fan Speed Control

Algorithm will not drive the fan at a level lower than the minimum drive unless the target TACH Target

is set at FFh. (See Section 7.32, "TACH Target Register".)

During normal operation, if the fan stops for any reason (including low drive), the RPM-based Fan

Speed Control Algorithm will attempt to restart the fan. Setting the Fan Minimum Drive Registers to a

setting that will maintain fan operation is a useful way to avoid potential fan oscillations as the control

circuitry attempts to drive it at a level that cannot support fan operation.

The Fan Minimum Drive Register is software locked.

Table 7.44 Spin Time

SPINUP_TIME[1:0]

TOTAL SPIN UP TIME

250 ms

500 ms (default)

1 sec

2 sec

Table 7.45 Fan Step Register

ADDR

R/W

DEFAULT

47h

R/W

Fan Max Step

10h

Table 7.46 Minimum Fan Drive Register

ADDR

R/W

DEFAULT

48h

R/W

Fan Minimum

Drive

128

66h

(40%)

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