LM93 datasheet(66/92 Pages) NSC

66 / 92 page

16.0 Registers (Continued)

16.8.8 Register C3h

Zones 1/2 MinPWM and Hysteresis

Address

Read/

Write

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Default

Value

C3h

R/W

Zones 1/2

MinPWM and

Hysteresis

MinPWM

FC_TH

N/D

Bit

Name

R/W

Description

3:0

FC_TH

R/W

This field sets the amount of hysteresis (in degrees

C) that is used by the auto-fan control for zones 1

and 2. This should be set greater than 0 to avoid

unwanted oscillation between two steps in the look-up

table.

7:4

MinPWM

R/W

This field determines the duty cycle that the auto-fan

control requests for zones 1 and 2 if the temperature

for the given zone falls below the programmed base

temperature for that zone. This field accepts 16

possible values that are mapped to duty cycles

according the table in the Auto-Fan Control section.

16.8.9 Register C4h

Zones 3/4 MinPWM and Hysteresis

Address

Read/

Write

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Default

Value

C4h

R/W

Zones 3/4

MinPWM and

Hysteresis

MinPWM

FC_TH

N/D

Bit

Name

R/W

Description

3:0

FC_TH

R/W

This field sets the amount of hysteresis (in degrees

C) that is used by the auto-fan control for zones 3

and 4. This should be set greater than 0 to avoid

unwanted oscillation between two steps in the look-up

table.

7:4

MinPWM

R/W

This field determines the duty cycle that the auto-fan

control requests for zones 3 and 4 if the temperature

for the given zone falls below the programmed base

temperature for that zone. This field accepts 16

possible values that are mapped to duty cycles

according the table in the Auto-Fan Control section.

LM93 Datasheet(PDF) 66 Page - National Semiconductor (TI)

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