ADM812SARTZ-REEL

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PMIC (Power Management Integrated Circuits) are devices that are used in electronics, providing a range of functions to maintain a stable supply of power to components within a circuit. One such device is the ADM812SARTZ-REEL – a supervisor series device that provides voltage and temperature monitoring and overvoltage protection for system-level applications. This article will discuss the application field of this PMIC, as well as outline its principle of operation.

Application Field

The ADM812SARTZ-REL is primarily used to provide overvoltage protection for systems that are susceptible to power surges. Designed for use in low-power applications, it is mainly used for embedded systems and other low-power system-level applications, such as medical and industrial control systems. It is also suitable for use as a protector in automotive applications.

The device provides precision monitoring of both voltage and temperature. It is designed to give an accurate indication of the output voltage and temperature of the connected component, allowing the system to adjust accordingly. The device also offers UVLO (under voltage lockout) with a software or hardware selectable reset delay, ensuring operation under all normal power conditions. Additionally, the device provides an open-drain active low reset output, allowing the system to function correctly during extreme conditions or when there is an unexpected power loss.

Working Principle

The ADM812SARTZ-REEL is based on a windowed voltage detector architecture. This architecture uses both a circuit and a software component to monitor voltages and temperatures. The circuit component monitors the monitored voltage for any changes and issues a reset pulse if needed. This pulse is then fed to the software component which sends an active-low reset signal to the target system, informing it of a voltage change or power loss.

The device comes with two selectable thresholds, a main threshold, which is normally set to 2.6V, and an under voltage lockout (UVLO) setting which can be adjusted to account for different system requirements. The device is also equipped with an adjustable power-on reset delay. This can be set to a software or hardware adjustable delay, depending on the system’s requirements. The UVLO setting also allows for the device to be disabled if any system malfunctions occur.

The device outputs an active-low reset signal, which is sent to the target system to indicate a low voltage situation or power loss. This active low reset signal is the device’s most important safety feature and is its most important role in protecting the system from excessive power losses.

The ADM812SARTZ-REEL is designed to be used in low-power system-level applications, such as embedded systems and industrial control systems. Its software- or hardware-selectable reset delay allows for the device to function as an overvoltage protector, while its active low reset output ensures the system functions properly during any unexpected power shortages.

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