ADM709TAR

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Different from traditional power management ICs (PMICs) which deliver robust voltage and current protection without the need for power-down cycling or use of system level controllers to decode polarity reversal, ADM709TAR is a Power Supply Supervision Circuit, which is designed to monitor the output voltage, input voltage or any other voltage in a power supply or in a system. It consists of an adjustable-threshold voltage detector, active-low reset output, debounced manual reset input, timer, and watchdog circuit. The ADM709TAR is provided in an 8-pin SOIC (Small Outline Integrated Circuit) package with an operating temperature range of 0 °C to 70 °C.

The primary application of the ADM709TAR is to provide a reset signal whenever the input voltage falls below or rises above a pre-determined threshold voltage. The reset signal produced by the ADM709TAR can be used to activate a system reset switch, or to drive a microcontroller. This is useful for preventing microcontroller instability caused by the occasional low or high input voltage from the power supply.

The Reset Output pin of ADM709TAR is an open-drain output and active-low, meaning that it is only driven when a power-failure condition is detected. When such a condition occurs, ADM709TAR will pull its output low for about 0.25 seconds and then return it high after the power-failure condition has gone away. The Reset Output is capable of driving a voltage of up to 30 V and is protected against short-circuit and high energy pulses.

The ADM709TAR also has a manual reset input which can be used to trigger a reset signal. This is useful in cases where a system manually needs to be reset. The manual reset pin must be held low for a period of at least 3 milliseconds to trigger the reset. This input is debounced, meaning that if a manual reset is triggered multiple times in quick succession, only one reset signal will be sent.

The ADM709TAR also features a timer which can be used to generate a periodic reset signal. This is useful in applications where it is desirable to reset the system at regular intervals. The timer interval can be adjusted using an external resistor. The timer is triggered by a rising voltage, meaning that if the voltage is kept high for a period longer than the timer interval, the reset signal will be generated.

The ADM709TAR also features a watchdog circuit which can be used to prevent system lock-ups due to software malfunctions. The watchdog circuit will reset the system if there is no activity on the appropriate pin for a period longer than the timer interval. This ensures that the system will always be able to reset itself in case of a crash. The watchdog period can also be adjusted using an external resistor.

In summary, the ADM709TAR is a Power Supply Supervision Circuit which is designed to monitor the output voltage, input voltage or any other voltage in a power supply or in a system. It features an adjustable-threshold voltage detector, active-low reset output, debounced manual reset input, timer, and watchdog circuit. The ADM709TAR is suitable for various applications such as preventing microcontroller instability caused by the occasional low or high input voltage from the power supply, and providing reset signals in response to failures of a power supply or system.

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