EMC6D103 datasheet(74/92 Pages) SMSC

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Fan Control Device with High Frequency PWM Support and Hardware Monitoring Features

Datasheet

Revision 0.3 (03-01-07)

SMSC EMC6D103

DATASHEET

8.2.22

Registers 6D-6Eh: Zone Hysteresis Registers

These registers become read only when the Lock bit is set. Any further attempts to write to these

registers shall have no effect.

If the temperature is above the Zone x Low Temp Limit, then drops below Zone x Low Temp Limit, the

following will occur:

The fan will remain on, at Fan PWM Minimum, until the temperature goes a certain amount below the

associated zones low temperature limit (see Zone x Low Temp Limit registers). That is, when the

temperature is less than the temperature limit minus the hysteresis value, the fan will turn off.

The Hysteresis registers control this amount. See below table for details.

8.2.23

This register becomes read only when the Lock bit is set. Any further attempts to write to this register

shall have no effect.

°c50

32h

127

°c127

7Fh

Table 8.40 Registers 6D-6Eh: Zone Hysteresis Registers

Address

Read/

Write

Bit 7

(MSb)

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

(LSb)

Default

Value

6Dh

R/W

Zone 1, Zone 2 Hysteresis

H1-3

H1-2

H1-1

H1-0

H2-

H2-2

H2-1

H2-0

44h

6Eh

R/W

Zone 3, Hysteresis

H3-3

H3-2

H3-1

H3-0

RES

40h

Table 8.41 Hysteresis Settings

SETTING

HYSTERESIS

°C

Table 8.42 Register 6F: XOR Test Register

Address

Read/

Write

Bit 7

(MSb)

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

(LSb)

Default

Value

6Fh

R/W

XOR Test Register

RES

XEN

00h

Table 8.39 Absolute Limit vs. Register Setting (continued)

ABSOLUTE LIMIT

ABS LIMIT (DEC)

ABS LIMIT (HEX)

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