ADM705AN

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The ADM705AN is a supervisory chip for power monitoring, suitable for circuit designs used in the automobile industry. This CMOS device is mainly used for preventing system reset in the case of a momentary power supply voltage drop below or above a predetermined value. Designed primarily for use in embedded systems, the ADM705AN features a reset interval timer, an off delay timer, an adjustable reset/power-on threshold, an open collector power-on reset (POR) output, an LOW Battery Reset (LBR) voltage sensing input, and a programmable reset time delay. These features make it an ideal component for applications in power supply monitoring and system maintenance.

The ADM705AN works by monitoring the voltage level at a system\'s power supply rail and producing a reset signal whenever the value drops below or rises above the designated threshold voltage. It also sends out a reset signal when the timer output times out after being enabled by a timer input. It monitors the system\'s supply voltage even during power-on reset sequences and holds the reset signal active until the supply voltage reaches the reset threshold, making it an ideal choice for embedded controllers and other system maintenance tasks.

The low battery reset (LBR) pin of the ADM705AN can be used to detect power supply voltage drops below its predetermined threshold voltage, and consequently trigger a reset signal to the system\'s processor. The reset signal will remain active until the power supply voltage rises back above the predetermined threshold. The low battery reset (LBR) pin is connected to a voltage divider circuit which divides the incoming voltage supply to the chip, and the voltage-sensing comparator compares the divided voltage to the predetermined threshold. When the divided voltage drops below the predetermined threshold, the comparator releases the reset signal.

In addition to its reset circuitry, the ADM705AN also has a timer circuit. This timer circuit is used to generate a reset signal on an off-delay timer output, when enabled by a timer input. The timer output will remain active until the timer circuit has timed out, and the reset signal will deactivate the timer. This timer circuit can also be used to generate a reset signal after a predetermined time delay, by connecting a capacitor between the provided CTIME pin and the ON pin.

The ADM705AN is a highly customizable chip, allowing users to configure the reset threshhold voltage and time delay by changing the resistor values in the external circuit. The reset threshold and timer delay pins can also be tied to an external voltage source, allowing the reset values to be changed easily, even when the device is already in operation. The ADM705AN can also be used to power down a system when the supply voltage reaches its predetermined threshold, making it an excellent choice for power supply monitoring and system maintenance tasks.

In conclusion, the ADM705AN is a highly efficient and reliable chip for power monitoring and system maintenance tasks. Its adjustable reset threshold, timer, and LOW Battery Reset (LBR) pins make the chip ideal for applications in the automobile industry, where system maintenance and power monitoring are critical. In addition, the adjustable reset and timer pins can be tied to an external voltage source, making the chip easily programmable even when it is already in operation.

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