The SGM809-JXN3L/TR is a supervisory circuit manufactured by SG Micro Corp. It functions as a voltage detector or reset IC, designed to monitor the supply voltage of microprocessors (MCUs) and other digital systems. When the supply voltage drops below a predetermined threshold, the SGM809 asserts a reset signal, preventing the MCU from operating erratically or corrupting data. This is crucial for ensuring stable and reliable system operation, especially during power-up or brown-out conditions.

Applications

• Microprocessor Reset: Provides a reliable reset signal for MCUs during power-up, power-down, and brown-out conditions.
• Power-On Reset (POR): Generates a reset signal at power-up to ensure proper initialization of the system.
• Brown-Out Protection: Prevents system malfunction and data corruption due to low voltage conditions.
• Voltage Monitoring: Continuously monitors the supply voltage and asserts a reset signal when it falls below the threshold.
• Embedded Systems: Suitable for use in various embedded systems requiring reliable voltage monitoring and reset functionality.

Features

• Precision Voltage Monitoring: Accurately monitors the supply voltage with a high level of precision.
• Reset Output: Generates a reset signal when the voltage drops below the threshold, typically an active-low signal.
• Fixed Threshold Voltage: A pre-defined threshold voltage at which the reset signal is asserted.
• Low Quiescent Current: Consumes minimal current during normal operation, making it suitable for battery-powered applications.
• Small Package: Available in a compact XN3L package, saving valuable board space.
• Active-Low Reset Output: The reset output is active low.

Benefits

• Improved System Reliability: Prevents erratic operation and data corruption due to low voltage conditions.
• Simplified Design: Integrates voltage monitoring and reset generation into a single, compact device.
• Reduced Power Consumption: Low quiescent current extends battery life in portable applications.
• Space Saving: Small package allows for high-density circuit layouts.
• Automatic Reset: Automatically resets the system during power-up and brown-out conditions, without requiring external intervention.

Additional Details

The SGM809-JXN3L/TR integrates a precision voltage reference, a comparator, and a reset output driver. When the monitored voltage is above the threshold, the reset output is de-asserted (high). When the voltage drops below the threshold, the reset output is asserted (low). The reset output remains asserted for a specified reset timeout period after the voltage rises above the threshold, providing sufficient time for the MCU to initialize properly. The device is typically supplied in tape and reel packaging for automated assembly. The datasheet provides detailed specifications, including the threshold voltage, reset timeout period, and operating temperature range. Proper decoupling capacitors should be used to ensure stable operation and minimize noise. The specific threshold voltage and reset timeout period for the SGM809-JXN3L/TR variant can be found in the manufacturer's datasheet.