ADM805LARNZ

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PMICs - Supervisors play a critical role in controlling how and when an electronic device functions. They are used to safely power up the device, monitor its activity and shut it down if necessary. The ADM805LARNZ is an example of a supervisor device from Analog Devices, Inc. and is designed for a wide range of applications. In this article, we will look at the application fields and working principles of the ADM805LARNZ.

Application Fields

The ADM805LARNZ is a Micro-Power Supervisor With Battery Backup Capability. It is designed to provide quick, reliable supervision of power and reset inputs when used in laptops, tablets, phones and other portable electronics that must operate for extended periods of time on backup batteries. It is also suitable for various medical applications that require continuous, uninterrupted power supply.

The device has an adjustable reset timeout which can be set to a maximum of 2ms. This allows the device to be used in applications where power-on reset detection is essential, such as immediate response systems. With its low operating current of 170nA, the ADM805LARNZ is highly power-efficient and can be used in ultra-low power systems that must remain operational even during periods of extended battery life. Furthermore, its wide voltage range (from 2.25V to 5.5V) makes it compatible with a variety of different batteries and power sources.

Working Principle

The ADM805LARNZ is an active low reset supervisor which controls the power-on signal from the battery. When an input voltage below its default threshold of 2.25V is detected, the device generates an active low reset signal. This reset signal is usually used to reset microcontrollers and other digital logic components in order to prevent any abnormal behavior.

The device also has a number of configurable features. For example, the reset timeout can be adjusted through external resistors. By selecting the appropriate resistor values, the reset timeout can be fine-tuned in order to meet the exact requirements of the application. The reset step/delay can also be set in order to give the device extra time to prepare the system for an operating voltage or prevent a sudden power-on if the input voltage fluctuates while the device is being powered up.

The ADM805LARNZ also includes an overvoltage detection circuit. This circuit monitors the input voltage and compares it against an adjustable threshold. If the voltage exceeds the threshold, an alarm output is generated which can be used to activate a system shutdown or notify the user of the problem.

Finally, the device also includes a programmable watchdog timer. This timer is used to ensure that the system is operating normally and can be programmed to reset the system in the event of any unexpected errors or malfunctions.

Conclusion

The ADM805LARNZ is a versatile micro-power supervisor with extensive battery backup capabilities. It is designed for use in a wide range of applications and is ideal for continuous power supply, immediate response systems, and ultra-low power devices. With its adjustable reset timeout, overvoltage detection circuit and programmable watchdog timer, the device ensures that the system is operating normally and can provide quick and reliable supervision of power and reset inputs.

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