PC8374L datasheet(191/239 Pages) NSC

191 / 239 page

8.0 Health Management (HM) (Continued)

Revision 1.1

191

www.national.com

8.5.86 Extended FANPWM Control 2

Location: 77h

Type:

R/W or RO (Becomes read-only when LOCK bit in the Configuration register is set.)

SPIN_END (Spin-Up End Select). Selects the condition used by the HM to end the spin-up process.

When the condition is met, the spin-up process ends and the FANPWM duty cycle is set to one of the following

values:

• The value set in FANPWMn Current Duty register, in Manual Fan Control mode

• The value generated from the current normalized temperature by the automatic algorithm, in Automatic Fan

Control mode (this value is updated in the FANPWMn Current Duty register)

• The value set in FANPWMn MAX Duty register, in Continuously On mode

The conditions are:

0: Whichever occurs first: either the spin-up time (set in SPIN field in the FANPWMn Control Configuration regis-

ter) has ended or the current fan speed is equal to or higher than either the minimum value of all the associated

Fan Tachometer ‘n’ Low Limit (LSB and MSB) registers.

1: Spin-up time has ended (default).

SPIN_DUTY. Determines the value shown in the FANPWM1-3 Current Duty registers (see Section 8.5.17 on

page 161 to Section 8.5.19) during spin-up.

0: FANPWMn Current Duty registers show 0 during spin-up (default)

1: FANPWMn Current Duty registers show the target duty cycle during spin-up

3-0

STEP_LEN. The step length used for soft speed-change of the FANPWM duty-cycle (the steps performed above

the minimum duty cycle value).

00h:

Reserved

01h - 0Fh: The duration of a “soft” step equals the STEP_LEN value, multiplied by 22.75 ms (default is 08h=182

ms)

Bit

76543210

Name

Reserved

SPD_CHG3 SPD_CHG2 SPD_CHG1

Reset

00000000

Bit

Description

7-3

Reserved.

SPD_CHG3. Sets the speed-change mode for FANPWM3 output for all fan control modes.

0: Hard speed change - the speed change is done in one single and immediate step (default)

1: Soft speed change - speed change is done in steps of 3.125% duty-cycle

Note: Speed change between a duty-cycle of 0% and the minimum duty-cycle (which is deﬁned in the

FANPWM3 Minimum register) is done in one immediate step.

SPD_CHG2. Same as SPD_CHG3 for FANPWM2.

SPD_CHG1. Same as SPD_CHG3 for FANPWM1.

Bit

Description

Winbond Electronics Corp. Advanced PC Product Center

PC8374L Datasheet(PDF) 191 Page - National Semiconductor (TI)

PC8374L Datasheet(HTML) 191 Page - National Semiconductor (TI)

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL