EMC2104 datasheet(69/101 Pages) SMSC

69 / 101 page

Dual RPM-Based PWM Fan Controller with Hardware Thermal Shutdown

Datasheet

SMSC EMC2104

Revision 1.74 (05-08-08)

DATASHEET

6.24

Gain Registers

The Gain Register stores the gain terms used by the proportional and integral portions of each of the

RPM based Fan Speed Control Algorithms. These gain terms are used as the KD, KI, and KP gain

terms in a classic PID control solution.

6.25

Fan Spin Up Configuration Registers

The Fan Spin Up Configuration Register controls the settings of Spin Up Routine. The Fan Spin Up

Configuration Register is software locked.

Bit 7 - 6 - DRIVE_FAIL_CNTx[1:0] - Determines how many update cycles are used for the Drive Fail

detection function as shown in Table 6.38. This circuitry determines whether the fan can be driven to

the desired tach target.

Table 6.35 Gain Registers

ADDR

R/W

DEFAULT

45h

R/W

Gain 1

GAIND[1:0]

GAINI[1:0]

GAINP[1:0]

2Ah

85h

R/W

Gain 2

GAIND[1:0]

GAINI[1:0]

GAINP[1:0]

2Ah

Table 6.36 Gain Decode

GAIND OR GAINP OR GAINI [1:0]

RESPECTIVE GAIN FACTOR

4x (default)

Table 6.37 Fan Spin Up Configuration Registers

ADDR

R/W

DEFAULT

46h

R/W

Fan 1 Spin Up

Configuration

DRIVE_FAIL

_CNT1 [1:0]

NOK

ICK1

SPIN_LVL[2:0]

SPINUP_TIM

E [1:0]

0Dh

86h

R/W

Fan 2 Spin up

Configuration

DRIVE_FAIL

_CNT2 [1:0]

NOK

ICK2

SPIN_LVL[2:0]

SPINUP_TIM

E [1:0]

0Dh

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