The SGM803-RXN3L/TR is a microprocessor reset circuit manufactured by SG Micro Corp. This device monitors the power supply voltage of a microprocessor or microcontroller and asserts a reset signal when the voltage drops below a certain threshold. This ensures that the microprocessor starts in a known state and prevents it from operating erratically due to low voltage conditions.

Applications

• Microprocessor Reset: Ensuring proper initialization of microprocessors and microcontrollers during power-up and brown-out conditions.
• Power-On Reset (POR): Generating a reset signal at power-up to initialize the system.
• Brown-Out Protection: Preventing system malfunction due to low voltage conditions.
• Voltage Monitoring: Supervising power supply voltage to ensure it remains within acceptable limits.
• System Monitoring: Monitoring voltage levels in embedded systems to detect potential problems.

Features

• Precision Voltage Monitoring: Accurately monitors the power supply voltage.
• Reset Output: Generates a reset signal when the voltage drops below the threshold.
• Fixed Threshold Voltage: Preset threshold for voltage detection.
• Low Quiescent Current: Minimizes power consumption.
• Small Package: Available in a compact package (XN3L).
• Active-Low Reset Output: The reset output is active low.

Benefits

• Improved System Reliability: Prevents erratic behavior of microprocessors and microcontrollers during low voltage conditions.
• Simplified Design: Integrates voltage monitoring and reset generation into a single device.
• Reduced Power Consumption: Low quiescent current extends battery life in portable applications.
• Space Saving: Small package allows for high-density circuit layouts.

Additional Details

The SGM803-RXN3L/TR features a precise internal voltage reference and a comparator to accurately detect undervoltage conditions. The reset output remains asserted for a certain period after the voltage recovers above the threshold, ensuring that the microprocessor has sufficient time to initialize properly. The reset output is an active-low signal, meaning that it is low during reset and high during normal operation. The device is typically supplied in tape and reel packaging for automated assembly. Consult the datasheet for detailed electrical characteristics, timing diagrams, and application notes. It is important to use proper decoupling capacitors to ensure stable operation. The datasheet will specify the typical reset timeout period.