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PC8374L Datasheet(PDF) 137 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # PC8374L
Description  SensorPathTM SuperI/O with Glue Functions
PDF  239 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

PC8374L Datasheet(HTML) 137 Page - National Semiconductor (TI)

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8.0 Health Management (HM) (Continued)
Revision 1.1
137
www.national.com
Figure 33. Soft Spin-Up and Soft Speed-Up Example
Figure 34. Soft Slow-Down and Soft Stop Example
Other Features
The FANPWM frequency is configured by the FREQ field in the Zone ‘n’ Auto Speed Range and FANPWMn Frequency reg-
isters.
The FANPWM signal polarity (whether 0% duty-cycle represents a low-level or a high-level signal) is configured by INV bit
in the FANPWMn Control Configuration registers (see Section 8.5.76 on page 187). INV bit is write-only; its value is reflected
in the respective FANOUTn_INV bit in the HMCFG1 register (see Section 3.15.3 on page 79), which is read-only.
FANOUTn_INV bit is powered by VBAT, thus preserving the polarity of the FANPWM signal during power failures (i.e., when
VSB3 power is off).
Duty Cycle
Time
85%
35%
20
21
22
12
13
23
23
Spin-up end by speed
Spin-up end by time
Minimum
Duty Cycle
Soft Speed-Up
Cycle “a”
0%
1
10
11
Duty
19
13
14
12
26
27
25
16
24
15
13
(PWM_MIN)
24
25
Time
85%
57%
Soft Slow-Down
Soft Stop
0%
Cycle “a”
Duty
8
9
1
6
7
17
18
16
Cycle “b”
Duty
20
21
19
23
22
24
27
26
25
Duty
Cycle
18.75%
Minimum Duty Cycle (PWM_MIN)
Winbond Electronics Corp. Advanced PC Product Center



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