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ADM1031 Datasheet(PDF) 24 Page - Analog Devices |
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ADM1031 Datasheet(HTML) 24 Page - Analog Devices |
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24 / 32 page  REV. 0 ADM1031 –24– Table XIV. Register 0x00 Configuration Register 1 Power-On Default 90h Bit Name R/ W Description 0 MONITOR Read/Write Setting this bit to a “1” enables monitoring of temperature and enables measurement of the fan tach signals. (Power-Up Default = 0.) 1 INT Enable Read/Write Setting this bit to a “1” enables the INT output. 1 = Enabled 0 = Disabled (Power-Up Default = 0.) 2 TACH/AIN Read/Write 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. (Power-Up Default = 0.) 3 PWM Invert Read/Write Setting this bit to “1” inverts the PWM signal on the output pins. (Power-Up Default = 0.) 4 Fan Fault Enable Read/Write Logic 1 enables FAN_FAULT pin; Logic 0 disables FAN_FAULT output. (Power-Up Default = 1.) 6–5 PWM Mode Read/Write 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 Read/Write Logic 1 selects Automatic Fan Speed Control; Logic 0 selects SW control. (Power-Up Default = 1) When under software control, PWM duty cycle or RPM values may be programmed for each fan. Table XV. Register 0x01 Configuration 2 Power-On Default = 7FH Bit Name R/ W Description 0 PWM 1 En Read/Write Enables Fan 1 PWM output when this bit is a “1.” 1 PWM 2 En Read/Write Enables Fan 2 PWM output when this bit is a “1.” 2 TACH 1 En Read/Write Enables Tach 1 input when set to “1.” 3 TACH 2 En Read/Write Enables Tach 2 input when set to “1.” 4 Loc Temp En Read/Write Enables Interrupts on Local Temperature Channel when set to “1.” 5 Remote 1 Temp En Read/Write Enables Interrupts on Remote 1 Channel when set to “1.” Default is normally enabled, except when a diode fault is detected on power-up. 6 Remote 2 Temp En Read/Write Enables Interrupts on Remote 2 Channel when set to “1.” Default is normally enabled, except when a diode fault is detected on power-up. 7 SW Reset Read/Write When set to “1,” resets the device. Self-clears. Power-Up Default = 0. |
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