Microchip MCP1317T-29LE/OT: A 93V Voltage Supervisor with Manual Reset
In the realm of electronic system design, ensuring reliable and predictable operation under varying power conditions is paramount. Voltage supervisors, or reset ICs, play a critical role in this domain by monitoring the power supply rail and holding a microcontroller in a known state until the supply voltage is stable and within specification. The Microchip MCP1317T-29LE/OT is a highly integrated device that excels in this function, combining a precise voltage monitoring capability with a manual reset input in an ultra-compact package.
This voltage supervisor is designed to monitor a 93V power rail, a common voltage level for many microcontrollers and digital systems. Its core function is to assert a reset signal whenever the VDD supply voltage drops below a predefined threshold. The precisely calibrated threshold voltage of 2.93V ensures that the connected microprocessor or logic circuit remains in a safe reset state, preventing erratic code execution or data corruption during power-up, power-down, or brownout events. The device continues to assert the reset signal for a fixed period (typically 140ms min.) after VDD has risen above the threshold, guaranteeing the power supply and system clock are fully stable before operation commences.
A key feature that enhances the flexibility of the MCP1317T-29LE/OT is its manual reset (MR) input. This active-low input allows an external switch, a logic signal from another part of the system, or even another supervisory circuit to initiate a processor reset on demand. This is invaluable for debugging, for providing a user-accessible reset button, or for ensuring system synchronization. The manual reset function is debounced and requires the input to be held low for a minimum duration to be recognized, preventing glitches from causing unintended resets.
Housed in a space-saving SOT-23-5 package, this supervisor is ideal for applications where board real estate is at a premium, such as in portable devices, embedded modules, and dense PCBs. Despite its small size, it is robust, operating over an industrial temperature range of -40°C to +85°C. Its low supply current makes it suitable for battery-powered applications, helping to extend overall system runtime.
In summary, the MCP1317T-29LE/OT provides a simple, effective, and reliable solution for maintaining system integrity in the face of power supply fluctuations and user interaction.
ICGOOODFIND: The MCP1317T-29LE/OT is a compact and robust voltage supervisor from Microchip, offering precise 2.93V monitoring and a valuable manual reset feature in a tiny SOT-23 package, making it an excellent choice for ensuring reliability in space-constrained embedded designs.
Keywords: Voltage Supervisor, Manual Reset, 2.93V Threshold, Brownout Protection, SOT-23-5.
