ADM1069ASTZ-REEL

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The ADM1069ASTZ-REEL, when classified in the PMIC - Supervisors category, is a system supervisor IC with integrated reset integrated circuit (RIC). This 30-pin part has user-programmable digital potentiometer, low-battery, and watch-dog timer (WDT) functions.

The ADM1069ASTZ-REEL is mainly used in microprocessor (MPU) power-supply monitoring of personal computers, workstations, and other related electronic equipment. Conceptually, its advantages include having a low-battery power supply; an adjustable threshold for under-voltage monitoring; an RIC for resetting the system in the event of an under-voltage or WDT timeout; and having a termination regulator with auto-restart and system monitoring.

Working Principle

The ADM1069ASTZ-REEL has three main operating stages: normal, protected, and reset. When in the normal stage, the IC will monitor the voltage levels of the system and use digital potentiometers to adjust the threshold levels. When the IC detects an under-voltage, it will enter the protected stage. In this stage, the IC is unable to execute reset commands, as that would require a manual reset. The IC will however indicate the power supply status to the user. When the under-voltage condition persists, the IC will enter the reset state and trigger the RIC, which will reset the system. The RIC will then be reset itself and the cycle starts again.

The WDT will also be monitored by the supervisor IC. When the timer counter reaches its preset timeout value, the IC will enter the reset state and execute the RIC. It will reset the WDT as well and the cycle will repeat itself. An advantage of the WDT is its ability to recognize and reset a power supply overshoot or undershoot, as these conditions might trigger a reset and an unintended system halt.

Benefits of Using the ADM1069ASTZ-REEL

The primary benefit of using the ADM1069ASTZ-REEL is that it prevents a system from entering an unsafe state due to an oversupply or undersupply of power. The digital potentiometer and WDT also add extra layers of protection that can prevent unwanted shutdowns or increase the system\'s resilience in the event of a power issue. The IC\'s integration of the reset control also simplifies system design by removing the need for external reset circuitry.

Moreover, the ADM1069ASTZ-REEL operates over the wide input supply voltage range of 4.75 to 13.2 V, so it can be used in a variety of applications. The supervisor IC also has industrial temperature range of -40 to 85°C, making it suitable for use in demanding industrial environments.

Conclusion

The ADM1069ASTZ-REEL is an ideal low-cost solution for microprocessor power-supply monitoring and system reset in personal computers, workstations and industrial electronics. It is equipped with a wide input supply voltage range and operating temperature range, as well as a user-programmable digital potentiometer, low-battery, and watch-dog timer functions.Integrated reset control simplifies system design, while the WDT\'s ability to recognize and reset power supply overshoot or undershoot increases system resilience. All in all, the ADM1069ASTZ-REEL is an highly-effective and reliable system supervisor IC.

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