Microchip MCP1317T-31AE/OT 08V Voltage Supervisor: Features and Application Circuits

In modern electronic systems, ensuring reliable and stable operation is paramount, especially when dealing with microcontrollers, FPGAs, or other sensitive digital circuits. Voltage supervisors, or reset circuits, play a critical role in this domain by monitoring the power supply and ensuring the system operates only when the voltage is within a specified range. The Microchip MCP1317T-31AE/OT is a prominent device in this category, offering robust performance and reliability in a compact package.

Key Features of the MCP1317T-31AE/OT

The MCP1317T-31AE/OT is a voltage supervisor designed to monitor 3.08V (typically denoted as 08V in the part number) power supplies. It is housed in a SOT-23-5 package, making it ideal for space-constrained applications. One of its standout features is its extremely low supply current, typically drawing just 4.5 µA, which is crucial for battery-powered and low-power devices. The device provides a reset signal whenever the supply voltage (VDD) drops below the preset threshold (3.08V), ensuring the connected microcontroller or processor remains in a known safe state until the power stabilizes.

The reset output is active-low (denoted as /RST), which is a common standard for enabling microcontrollers. The MCP1317T also incorporates a built-in delay timer, approximately 140 ms, which holds the reset signal active for a fixed period after the voltage has risen above the threshold. This allows the power supply and system clock to stabilize before the processor begins execution, preventing erratic behavior.

Application Circuits

The MCP1317T-31AE/OT is straightforward to implement, requiring minimal external components. A typical application circuit involves connecting the VDD pin to the power supply to be monitored and the GND pin to ground. The /RST output pin is connected directly to the reset pin of the microcontroller.

For added noise immunity, a small bypass capacitor (typically 0.1 µF) is recommended between the VDD and GND pins, placed as close to the device as possible. In some scenarios, an external capacitor can be added to the /RST line to extend the reset delay time beyond the internal fixed period, though this is often unnecessary due to the built-in delay.

This voltage supervisor is widely used in consumer electronics, embedded systems, industrial control systems, and portable battery-operated devices where maintaining system integrity during power-up, power-down, or brown-out conditions is critical.

ICGOODFIND Summary

The Microchip MCP1317T-31AE/OT is an efficient and reliable voltage supervisor, offering precise 3.08V monitoring, ultra-low power consumption, and a fixed reset delay in a miniature SOT-23-5 package. Its simplicity and robustness make it an excellent choice for ensuring system stability in a wide array of electronic applications.

Keywords: Voltage Supervisor, Reset Circuit, Low Power Consumption, Brown-Out Protection, Embedded Systems