MIC803-31D3VC3-TR: A 3.1V Voltage Supervisor with Manual Reset Input

In the realm of electronic systems, ensuring reliable and predictable operation during power-up, power-down, and brownout conditions is paramount. This critical task falls to a class of devices known as voltage supervisors or reset circuits. The MIC803-31D3VC3-TR from Microchip Technology is a quintessential example, offering a robust solution for monitoring system voltage and providing a manual reset capability in a compact package.

This specific device is engineered to monitor a 3.1V power supply rail. Its primary function is to assert a reset signal to the system's microcontroller (MCU) or processor whenever the supply voltage drops below a predefined threshold. The precisely calibrated threshold of 3.1V ensures that the connected logic components are held in a safe reset state until the power rail is stable and within acceptable limits, thereby preventing erratic code execution or data corruption.

A key feature that enhances its versatility is the inclusion of a manual reset input (MR). This active-low input allows an external switch, a logic signal from another part of the system, or even another supervisory circuit to force a reset cycle on demand. This is invaluable for debugging, user-initiated system restarts, or ensuring synchronization between multiple system components.

The MIC803-31D3VC3-TR is characterized by its low power consumption, making it suitable for battery-sensitive applications. It provides an active-low, open-drain reset output, which offers design flexibility by allowing the use of an external pull-up resistor to any desired voltage rail. Furthermore, the device boasts a 140ms fixed reset timeout period. After the supply voltage rises above the threshold, this internal timer maintains the reset signal for this fixed duration to guarantee the system microprocessor has adequate time to stabilize fully.

Housed in a space-saving SOT-23-3 package, this supervisor is ideal for applications where board real estate is at a premium. Its combination of precise voltage monitoring, manual user intervention, and minimal footprint makes it a perfect fit for a wide array of applications, including embedded systems, automotive electronics, industrial controls, and portable consumer devices.

ICGOOODFIND: The MIC803-31D3VC3-TR is an excellent choice for designers seeking a simple, reliable, and cost-effective voltage monitoring solution. Its integration of a manual reset input and a fixed timeout period in a tiny package provides essential system protection and control features with minimal external components.

Keywords: Voltage Supervisor, Manual Reset, 3.1V Threshold, Reset Timeout, Open-Drain Output.