PC8374L datasheet(187/239 Pages) NSC

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8.0 Health Management (HM) (Continued)

Revision 1.1

187

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8.5.76 FANPWM1 Control Configuration

Location: 5Ch

Type:

Varies per bit (The R/W bits become read-only when LOCK bit in the Configuration register is set.)

Table 60. Fan Operating Mode Conﬁguration

6-4

TEMP_FILT2. Sets temperature low-pass ﬁltering for temperature input to FANPWM2 Duty Cycle generator

according to Table 59. Filter rise time is from 0% to 95% of the input temperature change. This ﬁeld may be

changed only when the START bit in Conﬁguration register is set to 0.

FILT3_EN. Enable temperature ﬁltering for Zone3.

2-0

TEMP_FILT3. Sets temperature low-pass ﬁltering for temperature input to FANPWM3 Duty Cycle generator

according to Table 59. Filter rise time is from 0% to 95% of the input temperature change. This ﬁeld may be

changed only when the START bit in Conﬁguration register is set to 0.

Bit

76543210

Name

MODE

INV

SPIN

Reset

01100010

Bit

Type

Description

7-5

R/W or

MODE. Sets fan operation mode and temperature zone association according to Table 60.

In Auto Mode the FANPWM duty cycle is controlled by the temperature data supplied by the associated

Zone or by the hottest of the associated Zones. In Manual Mode the FANPWM is controlled by the

contents of the associated PWM Current Duty Register.

4WO

INV (FANPWM1 Output Invert). Sets polarity of FANPWM1 output signal. The value of INV is reﬂected

by the respective (read-only) FANOUTn_INV bit in the HMCFG1 register (see Section 3.15.3 on page 79).

INV bit is write-only; reading it returns an unpredictable value.

0: Normal signal - 100% duty cycle represents a high-level signal (default)

1: Inverted signal - 100% duty cycle represents a low-level signal

3-0

R/W or

SPIN. Sets maximum spin-up time according to Table 61. During spin-up, the FANPWM duty cycle is the

value contained in the associated FANPWMn MAX Duty register.

MODE

Meaning

‘000’

FANPWM on Zone1 auto

‘001’

FANPWM on Zone2 auto

‘010’

FANPWM on Zone3 auto

‘011’

FANPWM always on full (default)

‘100’

FANPWM disabled

‘101’

FANPWM controlled by hottest of zones 2,3

‘110’

FANPWM controlled by hottest of zones 1,2,3

‘111’

FANPWM manually controlled

Bit

Description

Winbond Electronics Corp. Advanced PC Product Center

PC8374L Datasheet(PDF) 187 Page - National Semiconductor (TI)

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