Maxim Integrated's DS1232LP MicroMonitor Chip

The DS1232LP from Maxim Integrated is a versatile and reliable microprocessor (µP) supervisory circuit that ensures proper system operation during power-up, operation, and power-down. This chip is designed to monitor the system voltage and automatically reset the microprocessor in the event of an error, thus safeguarding against software glitches, power surges, and other system malfunctions.

The DS1232LP features a precision temperature-compensated reference and comparator circuit that monitors the status of the power supply (V_CC). When V_CC falls below the minimum V_TP threshold, the reset signal is asserted, holding the microprocessor in a reset state for a minimum of 250ms after V_CC has risen above the reset threshold level. This ensures that the µP is fully operational before the system starts.

This device also incorporates a debounced manual push-button reset input which allows for a very low V_CC manual reset capability. The DS1232LP has an additional feature of an independent watchdog timer that, when open, will not force a reset as long as the system strobes the watchdog input within the selected timeout period. If the system fails to provide a strobe within the timeframe, a reset signal is issued, ensuring the system remains operational.

The DS1232LP is available in a compact 8-pin SOIC package, making it suitable for space-constrained applications. It is also fully compatible with industry-standard DS1232 and offers a wide operating temperature range from -40°C to +85°C, making it ideal for use in a variety of environments.

Key features of the DS1232LP include:

• Low power consumption
• Automated system reset during power failures
• Debounced TTL/CMOS-compatible manual reset input
• Independent watchdog timer
• Guaranteed reset output down to V_CC = 1V
• Compatible with DS1232

The DS1232LP is a critical component for systems that require reliable operation and a robust power-on reset functionality, making it an excellent choice for a wide range of applications including computers, controllers, intelligent instruments, and critical µP power monitoring.