Maxim Integrated MAX691ACPE+ Microprocessor Supervisory Circuit

The Maxim Integrated MAX691ACPE+ is a highly integrated microprocessor (µP) supervisory circuit designed 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.

This supervisory circuit ensures that the µP is reset to a known state upon power-up by providing a precision voltage monitor for power-fail or low-battery warning, a watchdog timer for system malfunction detection, and a µP reset pulse generator. The MAX691ACPE+ enhances system reliability by performing several critical monitoring functions.

Key Features:

• Power-Supply Monitoring: The device keeps a vigilant watch on the power supply voltage levels. It generates a reset signal for the microprocessor whenever it detects an out-of-tolerance condition, ensuring that the system boots up in a stable and predictable state.
• Watchdog Timer: The built-in watchdog timer monitors the system operation. If the microprocessor becomes unresponsive due to a software glitch or other fault, the watchdog timer will reset the system, allowing for recovery from an error state.
• Battery Backup Switching: The MAX691ACPE+ includes an automatic backup battery switchover function, which is essential for maintaining volatile memory contents when the main power is interrupted.
• Manual Reset Input: A manual reset input is provided to allow for an external signal to reset the system, which can be useful during system maintenance or troubleshooting.

Applications:

The MAX691ACPE+ is suitable for use in a wide variety of applications where reliable system operation is critical. These include:

• Computers and Controllers
• Intelligent Instruments
• Automotive Systems
• Critical µP Power Monitoring

Encased in a 16-pin DIP package, the MAX691ACPE+ is easy to integrate into a system design. Its operation is guaranteed over the full temperature range of -40°C to +85°C, making it a robust choice for managing µP systems in challenging environmental conditions. Maxim Integrated's commitment to quality ensures that the MAX691ACPE+ supervisory circuit is a reliable component for maintaining the integrity of your digital systems.