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ADM1029 Datasheet(PDF) 4 Page - Analog Devices |
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ADM1029 Datasheet(HTML) 4 Page - Analog Devices |
4 / 48 page REV. 0 ADM1029 –4– PIN FUNCTION DESCRIPTIONS Pin No. Mnemonic Description 1 DRIVE1 Open Drain Digital Output. Pulsewidth Modulated (PWM) output to control the speed of Fan 1. Requires 10 k Ω typical pull-up resistor. 2 FAULT1 Open Drain Digital I/O. When used with a fan having a fault output, a Logic 0 input to this pin signals a fault on Fan 1. Also used as a fault output. 3 TACH1 Open Drain Digital Input. Digital fan tachometer input for Fan 1. Will accept logic signals up to 5 V even when VCC is lower than 5 V. 4 PRESENT1 Open Drain Digital Input. A shorting link in the fan connector holds this pin low when Fan 1 is connected. 5 SCL Open Drain Digital Input. Serial Bus Clock. Requires 2.2 k Ω pull-up typical. 6 SDA Digital I/O. Serial Bus bidirectional data. Open-drain output requires 2.2 k Ω pull-up. 7 GND System Ground 8VCC Power (3.0 V to 5.5 V). Typically powered from 3.3 V power rail. Bypass with the parallel combination of 10 µF (electrolytic or tantalum) and 0.1 µF (ceramic) bypass capacitors. 9 CFAULT Open Drain Digital I/O. Cascade fault input/output used for fault signaling between multiple ADM1029s. 10 INT Digital Output. Interrupt Request (Open Drain). The output is enabled when Bit 1 of the Configuration Register is set to 0. The default state is enabled. 11 GPIO2 Open Drain Digital I/O. General-purpose logic I/O pin. 12 RESET Open Drain Digital Input. Active low reset input. 13 D1–/GPIO3 Analog Input/Open Drain Digital I/O. Connected to cathode of external temperature-sensing diode, or may be reconfigured as a general-purpose logic input/output. 14 D1+/GPIO4 Analog Input/Open Drain Digital I/O. Connected to anode of external temperature-sensing diode, or may be reconfigured as a general-purpose logic input/output. 15 ADD Eight-Level Analog Input. Used to set the three LSBs of the serial bus address. 16 D2–/GPIO5 Analog Input/Open Drain Digital I/O. Connected to cathode of external temperature-sensing diode, or may be reconfigured as a general-purpose logic input/output. 17 D2+/GPIO6 Analog Input/Open Drain Digital I/O. Connected to anode of external temperature-sensing diode, or may be reconfigured as a general-purpose logic input/output. 18 TMIN/INSTALL Eight-Level Analog Input. The voltage on this pin defines whether automatic fan speed control is enabled, the minimum temperature at which the fan(s) will turn on in automatic speed con- trol mode, and the number of fans that should be installed. 19 AIN0/GPIO0 Analog Input/Open Drain Digital I/O. May be configured as a 0 V to 2.5 V analog input or as a general-purpose digital I/O pin. 20 AIN1/GPIO1 Analog Input/Open Drain Digital I/O. May be configured as a 0 V to 2.5 V analog input or as a general-purpose digital I/O pin. 21 PRESENT2 Open Drain Digital Input. A shorting link in the fan connector holds this pin low when Fan 2 is connected. 22 TACH2 Open Drain Digital Input. Digital fan tachometer input for Fan 2. Will accept logic signals up to 5 V even when VCC is lower than 5 V. 23 FAULT2 Open Drain Digital I/O. When used with a fan having a fault output, a Logic 0 input to this pin signals a fault on Fan 2. Also used as a fault output. 24 DRIVE2 Open Drain Digital Output. Pulsewidth Modulated (PWM) output to control the speed of Fan 2. Requires 10 k Ω typical pull-up resistor. |
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