MCP111-475E/TO

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The MCP111-475E/TO, produced by Microchip Technology Inc, is a Microcontroller Reset Circuit with Voltage Monitor, commonly classified as a type of supervisor (PMIC-Supervisors). The device is a fully integrated, low power reset circuit consisting of an active low push-pull reset output driver and an independent comparator-based voltage monitor. It is specifically used in designs where a "window" voltage monitor must detect a low-voltage condition, then force a reset pulse of sufficient width to reset the microcontroller/microprocessor. This article will look into the application fields and working principle of the MCP111-475E/TO.

Application Fields

The MCP111-475E/TO is specifically designed for industrial, automotive, and other applications which require monitoring of the voltage supply for a microcontroller/microprocessor to prevent system crashes. It is intended to provide a reset signal at a precise voltage set-point, making sure that the system remains stable and operates within optimal conditions.

It is especially suited for applications where a manual reset pulse cannot easily be provided, such as interconnected battery-backed systems which require long reset pulse. The MCP111-475E/TO are also ideal for use in systems with multiple power sources and/or multiple voltage rails, as its reset control independent of the supply voltage for accurate reset timing and a more reliable system.

Features

The MCP111-475E/TO have a range of features which make them ideal for use in the target applications. These include:

• Low power operation with standby current of only 7.5µA.
• Push-pull reset output driver.
• High accuracy independent window voltage monitor.
• Reset control completely independent of the supply voltage.
• External reset input/output control.
• Reset active high/low select by logic control.

Working Principle

The MCP111-475E/TO works by constantly monitoring the supply voltage using a comparator-based window voltage monitor. An internal comparator detects the supply voltage level, and is used to compare this voltage against the predefined voltage levels to determine the reset status.

When the supply voltage falls below a predefined level, an active low reset signal is asserted by the MCP111-475E/TO. This reset signal can be used to reset the microcontroller/microprocessor to an idle state, and also to reset any associated peripheral devices. The reset signal remains asserted until the voltage rises back above the predefined levels.

The MCP111-475E/TO can also be used to provide a manual reset input, or a reset output when used in conjunction with an external capacitor. This provides a flexible and robust system reset solution, ensuring that the microcontroller/microprocessor and associated peripherals remain in a known and stable state.

Conclusion

The MCP111-475E/TO are a type of PMIC - Supervisors specifically designed for use in industrial, automotive and other applications requiring reliable reset control. The device provides an active low push-pull reset output driver and a high accuracy independent window voltage monitor for maximum reliability. It is an ideal device for applications with multiple power sources and/or multiple voltage rails, as the reset control is independent of the supply voltage for accurate reset timing.

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