ADM691AARWZ

Series:	--
Packaging:	Tube
Part Status:	Active
Type:	Battery Backup Circuit
Number of Voltages Monitored:	1
Output:	Open Drain, Push-Pull
Reset:	Active High/Active Low
Reset Timeout:	140 ms Minimum
Voltage - Threshold:	4.65V
Operating Temperature:	-40°C ~ 85°C (TA)
Mounting Type:	Surface Mount
Package / Case:	16-SOIC (0.295", 7.50mm Width)
Supplier Device Package:	16-SOIC
Base Part Number:	ADM691

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ADM691AARWZ Introduction

The ADM691AARWZ, manufactured by Analog Devices, is a microprocessor supervisor. It is designed to provide power-failure and watchdog timer functions to protect operational systems. The supervisor uses an advanced Ring Oscillator circuit to detect power fail events and provides reset outputs to maintain the operational integrity of the system. It can be used in a variety of applications, including servers, instrumentation systems, and medical equipment, due to its high accuracy and wide operating temperature range.

Features

The ADM691AARWZ has several distinct features that make it an ideal choice for power-failure and watchdog timer applications. Among these features are its low current consumption, its temperature-compensated reset generator with delay, its reset disable option, and its selectable power-up delay. The ADM691AARWZ is capable of operating down to 1.2V and up to 13V. It also supports a variety of reset options, including push-button, power-on open-drain reset, Power-Fail, Window Watchdog (WWD), and Manual Reset. The reset pulse width is programmable, as are a variety of other features, such as the reset time-out and Watchdog time-out periods.

Application Fields

The ADM691AARWZ is designed to be used in various applications, ranging from servers and workstations to telecom systems and instrumentation control systems. Its low current consumption makes it ideal for use in battery-powered applications. Additionally, its broad operating range makes it suitable for use in extreme temperatures or environments. It is an ideal choice for most embedded applications, where its reset generator and watchdog timer functions are needed. The ADM691AARWZ can also be used in automotive applications. Its low power consumption makes it a perfect fit for cars and other vehicles, while its reset generator and watchdog functions provide the necessary protection. Furthermore, its adjustable reset pulse width and reset time-out periods make it a great choice for automotive ECUs and other applications that require precise power-fail detection.

Working Principle

The ADM691AARWZ is based on a Ring Oscillator circuit. The circuit includes an input stage, an amplifier stage, and a high-speed comparator. The input stage is used to detect power-fail events, while the amplifier stage serves to amplify the input signal. The high-speed comparator is used to detect the changes in the power-fail signal and reset the system when necessary.The Ring Oscillator circuit is designed to sense power events and generate reset messages. When the circuit senses a power event, it sends a reset signal to the reset message generator. The reset message is then delayed according to the specifications of the supervisor, causing the reset message to be sent at the correct time. Once the reset message is sent, the system is reset and the supervisor returns to its idle state, ready to detect the next power event.

Conclusion

The ADM691AARWZ is an ideal choice for applications that require reliable power-fail detection and reset functions. Its low current consumption and wide operating temperature range make it suitable for a variety of applications, ranging from servers and workstations to automotive systems and instrumentation control systems. It is also designed with advanced features, such as its Temperature-Compensated Reset Generator with Delay, its window watchdog feature, and its adjustable reset pulse width. With these features, the ADM691AARWZ is an excellent choice for any embedded system that requires reliable power-fail detection and reset functions.

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