The MAX690SCPA is a highly-reliable microprocessor (µP) supervisory circuit designed by Maxim Integrated to monitor power supplies and microprocessor activity in digital systems. It provides excellent circuit reliability and low cost by eliminating external components and adjustments when used in battery-powered applications.

Key Features

• Power Supply Voltage Monitoring: The device ensures that the microprocessor is reset to a known state during power-up, power-down, and brown-out conditions. It monitors the power supply voltage and keeps the microprocessor in the reset state until that voltage reaches an adequate level for reliable operation.
• Battery Backup Switching: For systems with battery backup, the MAX690SCPA can automatically switch between the main power supply and the battery during failures, ensuring uninterrupted operation.
• Low Power Consumption: This supervisory circuit is designed for low power consumption, which is critical for extending battery life in portable applications.
• Watchdog Timer: An onboard watchdog timer provides an independent system check for software failures. The watchdog timer requires periodic servicing by the host microprocessor to prevent it from resetting the system, ensuring proper operation.
• Manual Reset Input: The device includes a manual reset input that allows for an external trigger to initiate a system reset.

Applications

The MAX690SCPA is ideal for use in microprocessor-based systems, including:

• Computers and Controllers
• Intelligent Instruments
• Portable/Battery-Powered Equipment
• Industrial Systems

Technical Specifications

The MAX690SCPA supervisory circuit is a crucial component for any system requiring high reliability and robust power supply monitoring. Its integration into a system helps prevent data corruption and ensures that the system operates as intended, even in the face of power supply anomalies.