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ADM1028 Scheda tecnica(PDF) 4 Page - Analog Devices |
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ADM1028 Scheda tecnica(HTML) 4 Page - Analog Devices |
4 / 16 page REV. A ADM1028 –4– PIN FUNCTION DESCRIPTIONS Pin No. Mnemonic Description 1 FAN_OFF Digital Output (Open Drain) Fan Off Request. When asserted low, this indicates a request to shut off the fan independent of the FAN_SPD output. When negated (output FET off) it indicates that the fan may be turned on. 2 GPI Digital Input (12 V tolerant). This pin is a general-purpose logic input with 12 V toler- ance. It can be programmed as an active high or active low input that sets Bit 4 of the Interrupt Status Register. A voltage >2.2 V on this pin, represents a Logic “1,” while a floating condition is interpreted as Logic “0.” 3 AUXRST Digital Input. This pin can be driven low as an input to reset the ADM1028. 4 GND Ground. Power and signal ground. 5VCC3AUX Power 3.3 V Aux. Power source and voltage monitor input for power-on reset. 6 RST Digital Input. This pin can be pulled low externally to indicate to the ADM1028 that the main system power has been removed. The ADM1028 will shut off the FAN_SPD out- put and reset its R_OFF output. 7 R_RST Digital Output (Open Drain). This pin is a remote reset output that pulses low on receipt of a specific SMBus message. 8 FAN_SPD/NTEST_IN Analog Output/Test Input. An active-high input that enables NAND board-level connectivity testing. Refer to section on NAND testing. Used as an analog output for fan speed control when NAND test is not selected. 9 D– Remote Thermal Diode Negative Input. This is the negative input (current sink) from the remote thermal diode. This also serves as the negative input into the A/D. 10 D+ Remote Thermal Diode Positive Input. This is the positive input (current source) from the remote thermal diode. This serves as the positive input into the A/D. 11 THERMA/NTEST_OUT Digital Output (Open Drain with Integrated VCC3AUX Pull-Up). An active low thermal overload output that indicates a violation of a temperature setpoint (over temperature). The fan is on full-speed whenever this pin is asserted low. Acts as the output of the NAND Tree when the ADM1028 is in NAND Tree Test Mode. 12 THERMB Digital Output (Open Drain). This pin is a second THERM signal. It can be used to drive external circuitry with a different external pull-up supply rail. 13 R_OFF Digital Output or Open Drain with Integrated VCC3AUX Pull-Up. Remote off (power- down) output. This pin is driven high on receipt of a specific SMBus message. The pin (and its associated register bit) remain high until the RST input is asserted low. 14 INT Digital Output (Open Drain), System Interrupt Output. This signal indicates a violation of a set trip point. The output is enabled when Bit 1 of the Configuration Register is set to 1. The default state is disabled. 15 SCL Digital Input. SMBus Clock. 16 SDA Digital I/O (Open Drain). SMBus Bidirectional Data. PIN CONFIGURATION TOP VIEW (Not to Scale) 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 FAN_OFF GPI AUXRST GND VCC3AUX RST R_RST FAN_SPD/NTEST_IN SDA SCL INT R_OFF THERMB THERMA/NTEST_OUT D+ D– ADM1028 |
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