ADM802LARN

Supervisors Overview

The ADM802LARN is a microprocessor supervisory circuit manufactured by Analog Devices Inc., designed for reliable system monitoring in embedded applications. It operates within a supply voltage range of 1.5 V to 5.5 V and features a precise reset threshold voltage of 4.65 V with an accuracy of 1%. The device provides a push-pull active-low reset output and includes a fixed timeout period of 200 ms to ensure stable power-up sequencing. Key functional attributes include integrated battery switchover capability, a watchdog timer with a 1.4 s timeout, and power-fail warning functionality. It supports manual reset input and chip enable control, operating reliably across an extended temperature range from -40°C to +85°C.

Supervisors Feature Summary

• Integrated battery backup switchover mechanism for seamless transition between primary and secondary power sources
• Built-in watchdog timer with configurable timeout to detect software malfunctions and recover the system
• Power-fail warning signal generation to alert the processor of impending voltage loss
• Manual reset input pin allowing external triggering of the reset state

Supervisors Applications

• Microprocessor and microcontroller system supervision
• Battery-powered portable devices requiring backup power management
• Industrial control systems needing robust power-fail detection
• Embedded computing platforms utilizing watchdog-based fault recovery

Supervisors Procurement Notes

Verify the specific suffix 'ARN' against the manufacturer's current datasheet to confirm package type (SOIC-8) and temperature grade (-40°C to +85°C). Ensure compatibility with existing PCB footprint and verify that the 4.65 V threshold aligns with the target logic levels. Confirm RoHS compliance status and check for any recent lifecycle notices or obsolescence warnings directly from Analog Devices documentation before finalizing procurement.

Supervisors Selection Notes

Select this component when a combined solution for voltage monitoring, battery switchover, and watchdog protection is required in a compact form factor. The ADM802LARN is suitable for designs where a single IC must manage multiple supervisory functions without additional discrete components. Consider the 200 ms reset timeout and 1.4 s watchdog interval against the system's startup time and clock frequency requirements to ensure proper operation margins.

Supervisors Part Context

The ADM802L belongs to the ADM80x series of microprocessor supervisors from Analog Devices, which are widely used for ensuring system reliability in digital electronics. This series typically integrates voltage monitoring, reset generation, and watchdog features into a single package. The 'L' variant often denotes specific performance characteristics or package options within the family, while the 'ARN' suffix specifies the industrial temperature range and SOIC-8 surface-mount packaging.

Supervisors Replacement Considerations

Direct replacements may include other ADM80x series variants such as the ADM809 or ADM810, provided they match the required threshold voltage and feature set. Verify that substitute parts support the same battery switchover and watchdog functionalities. Check pinout compatibility and electrical specifications like reset timeout duration to ensure seamless integration without redesigning the surrounding circuitry.