IT8712F Datasheet, PDF (97/189 Pages) List of Unclassifed Manufacturers – Environment Control -Low Pin Count Input / Output(EC - LPC I/O)

Functional Description
Bit
R/W
Description
Temperature Limit.
2-0
R/W FAN_CTL3-1 Output Mode Selection
0: ON/OFF mode.
1: SmartGuardian mode.
9.5.2.2.17 FAN_CTL Control Register (Index=14h, Default=50h)
Bit
R/W
Description
7
R/W FAN_CTL Polarity
0: Active Low.
1: Active High.
6-4
R/W PWM base clock select.
000: 48Mhz (PWM Frequency=375Khz).
001: 24Mhz(PWM Frequency=187.5Khz).
010: 12Mhz(PWM Frequency=93.75Khz)
011: 8Mhz(PWM Frequency=62.5Khz)
100: 6Mhz(PWM Frequency=46.875Khz)
101: 3Mhz(PWM Frequency=23.43Khz)
110: 1.5Mhz(PWM Frequency=11.7Khz)
111: 0.75Mhz(PWM Frequency=5.86Khz).
3
R/W PWM Minimum Duty Select.
0: 0 %. For a given PWM value, the actual duty is PWM/128 X 100%.
1: 20 %. For a given PWM value (not 00h), the actual duty is (PWM+32)/160 X
100%. If the given PWM value is 00h, the actual duty will be 0%.
2-0
R/W FAN_CTL3-1 ON/OFF Mode Control
These bits are only available when the relative output modes are selected in ON/OFF
mode.
0: OFF.
1: ON.
9.5.2.2.18 FAN_CTL1 PWM Control Register (Index=15h, Default=00h or 40h)
This default value of this register is selected by JP5.
Bit
R/W
Description
7
R/W FAN_CTL1 PWM mode Automatic/Software Operation Selection
0: Software operation. 1: Automatic operation.
6-0
R/W 128 steps of PWM control when in Software operation (bit 7=0), or
Temperature input selection when in Automatic operation (bit 7=1).
Bits[1:0]:
00: TMPIN1
01: TMPIN2
10: TMPIN3
11: Reserved
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IT8712F V0.81