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ADM1031
Table 18. REGISTER 0X00 CONFIGURATION REGISTER 1 POWER-ON DEFAULT = 90H
Bit
0
1
2
3
4
6 ? 5
Name
MONITOR
INT Enable
TACH/AIN
PWM Invert
FAN_FAULT Enable
PWM Mode
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Description
Setting this bit to a “1” enables monitoring of temperature and enables measurement
of the fan tach signals. (Powerup Default = 0)
Setting this bit to a “1” enables the INT output. 1 = Enabled 0 = Disabled
(Powerup Default = 0)
Clearing this bit to “0” selects digital fan speed measurement via the TACH pins.
Setting this bit to “1” configures the TACH pins as analog inputs that can measure the
speed of 2-wire fans via a sense resistor. (Powerup Default = 0)
Setting this bit to “1” inverts the PWM signal on the output pins. (Powerup Default = 0)
Logic 1 enables FAN_FAULT pin; Logic 0 disables FAN_FAULT output.
(Powerup Default = 1)
These two bits control the behavior of the fans in auto fan speed control mode.
00 = Remote Temp 1 controls Fan 1; Remote Temp 2 controls Fan 2.
01 = Remote Temp 1 controls Fan 1 and Fan 2.
10 = Remote Temp 2 controls Fan 1 and Fan 2.
11 = Max of Local Temp and Remote Temp 1 and 2 drives Fans 1 and 2.
These two bits have the following effect in software control mode.
00 = Program PWM duty cycles for Fans 1 and 2.
11 = Program RPM Speeds for Fans 1 and 2.
7
Auto/SW Ctrl
R/W
Logic 1 selects automatic fan speed control; Logic 0 selects SW control. (Powerup
Default = 1). When under software control, PWM duty cycle or RPM values can be
programmed for each fan.
Table 19. REGISTER 0X01 CONFIGURATION 2 POWER-ON DEFAULT = 7FH
Bit
0
1
2
3
4
5
6
7
Name
PWM 1 En
PWM 2 En
TACH 1 En
TACH 2 En
Loc Temp En
Remote 1 Temp En
Remote 2 Temp En
SW Reset
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Description
Enables Fan 1 PWM output when this bit is a “1.”
Enables Fan 2 PWM output when this bit is a “1.”
Enables Tach 1 input when set to “1.”
Enables Tach 2 input when set to “1.”
Enables Interrupts on local temperature channel when set to “1.”
Interrupts on Remote 1 Channel when set to “1.” Default is normally enabled, except
when a diode fault is detected on powerup.
Enables Interrupts on Remote 2 Channel when set to “1.” Default is normally enabled,
except when a diode fault is detected on powerup.
When set to “1,” resets the device. Self-clears. Powerup Default = 0.
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