F75373S datasheet(15/49 Pages) FINTEK

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F75373S Datasheet(PDF) 15 Page - Feature Integration Technology Inc.

Part #	F75373S

Description	Fintek Hardware Monitor IC Datasheet

Download	49 Pages

Scroll/Zoom	100%

Manufacturer	FINTEK [Feature Integration Technology Inc.]

Direct Link	http://www.fintek.com.tw/eng

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15 / 49 page

Fintek

Feature Integration Technology Inc.

V0.25P

F75373

5.4.3.3 PWMOUT Duty-cycle operating process

In both “FAN SPEED” and “TEMPERATURE” modes, F75373S adjust PWMOUT duty-cycle according to current

fan count and expected fan count. It will operate as follows:

(1). When expected count is FFFFh, PWMOUT duty-cycle will be set to 00h to turn off fan.

(2). When expected count is 0000h, PWMOUT duty-cycle will be set to FFh to turn on fan with full speed.

(3). If both (1) and (2) are not true and KEEP_DROP_DUTY(see INDEX 60h) is set to 0,

(a). When PWMOUT duty-cycle decrease to DROP_DUTY(≠ 00h), obviously the duty-cycle will be 00h next,

F75373S will keep duty-cycle at 00h 3 seconds

1. After that, F75373S starts to compare current fan count and

expected count in order to increase or decrease its duty-cycle. This ensures that if there is any glitch during the 3

seconds

1 period, F75373S will ignore it.

(b). When PWMOUT duty-cycle increase from 00h to RAISE_DUTY(≠ 00h), F75373S also will keep duty-cycle

at RAISE-DUTY 3 seconds

1. After that, F75373S starts to compare current fan count and expected count in order

to increase or decrease its duty-cycle. This ensures that if there is any glitch during the 3 seconds

1 period,

F75373S will ignore it.

Note 1: The period can be programmed at INDEX 6Eh.

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