ADM691AARU-REEL

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The ADM691AARU-REEL, part of the Analog Devices (ADI) Power Management and Interface IC family, is a voltage supervisor chip designed to protect electronic devices in power-critical applications. This chip is a low-cost, integrated, 1.8V micro-power supervisor with a built-in 1.486V reference, high accuracy and low quiescent current. It is used to detect any unexpected low voltage interruptions and thus protect the circuits from damage.

The purpose of this chip is to monitor the supply voltage and generate an interrupt signal when the input voltage deviates from its normal operating range. This supervisor is available in a small and low profile form factor, making it suitable for wide range of applications such as embedded computing and storage, industrial, automotive, and medical electronics.

The ADM691AARU-REEL is designed to be configured as a power-on reset controller, a single supply reset, a logic supply reset, or a brown-out detector. It can also be configured to drive an open drain active-high output and generate an interrupt when the supply voltage drops below an adjustable preset level or rises above a second adjustable preset. The ADM691AARU-REEL can detect a brown-out condition by monitoring the system supply voltage and generate a reset, or an interrupt, when that voltage drops below the minimum supply reset voltage, which can be set to 0.25V.

In addition to its primary function of protecting circuits from power surges, the chip can also provide other features such as power-on reset, logic supply reset, single supply reset, and brown-out detection. The chip also features a reset active time of 1.5μs, a low reset input threshold voltage of 0.6V, and a watchdog timer for supervised device reset.

The ADM691AARU-REEL voltage supervisor is ideal for high-end transistor-transistor logic (TTL) applications, and other low-voltage, low-power applications that require protection from over or under voltage. It can also be used to protect devices from voltage transients or brown-out conditions.

The ADM691AARU-REEL works by monitoring the voltage of the power supply at the input terminals. A reference voltage is generated and regulated internally, which is compared to the input voltage. When the input voltage drops below a certain preset level, or rises above another preset level, the chip will generate an output to indicate a low voltage interrupt.

The chip can also be configured to drive an open-drain reset output and generate a reset pulse once the supply voltage reaches either of the preset levels. The reset pulse can be used to reset the system, and can also be used to protect against an overvoltage condition.

The external components of the ADM691AARU-REEL only consist of an output pull-up resistor and a low-pass filter. This simplifies circuit design and reduces system size. The chip also has a low power consumption, making it suitable for battery operated devices. The quiescent current of this chip can easily be kept under 100nA.

The ADM691AARU-REEL chip is a robust, cost-effective solution that provides reliable protection to circuits from unexpected low voltage interruptions. It is ideal for use in wide range of applications such as embedded computing and storage, industrial, automotive and medical electronics. The high accuracy, low quiescent current and the wide operating temperature range make it the perfect fit for these applications.

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