MIC2775-29YM5-TR: A Comprehensive Guide to the Microprocessor Supervisory Circuit with Manual Reset
In the realm of electronic systems, ensuring consistent and reliable operation is paramount. The MIC2775-29YM5-TR stands as a critical component in achieving this goal, functioning as a dedicated microprocessor supervisory circuit. This integrated circuit is engineered to monitor system power supplies and provide crucial control signals, thereby safeguarding sensitive digital logic, microprocessors (µPs), microcontrollers (MCUs), and other vital components from operating under unstable or out-of-specification voltage conditions.
The primary role of the MIC2775 is continuous voltage monitoring. The "-29" in its part number signifies a fixed voltage threshold of 2.93V. It meticulously monitors the VDD supply voltage. If this voltage drops below the 2.93V threshold, the device asserts a reset signal. This proactive measure prevents the microprocessor from executing instructions erratically, which could lead to data corruption, system lock-ups, or unintended operations. The reset signal remains asserted until the supply voltage rises back above the threshold and remains stable for a predetermined minimum period, known as the reset timeout period. This built-in delay, set internally to 280ms in the MIC2775-29, ensures the power supply and system clock have stabilized before the microprocessor begins code execution.
A defining feature of this specific IC is its manual reset capability. In addition to automatic voltage monitoring, the device incorporates a manual reset input pin (`MR`). This active-low input allows an external switch or another digital logic signal to force a system reset on command. This is an invaluable feature for debugging, testing, or providing end-users with a way to restart a locked-up application without cycling the main power. The manual reset function is entirely independent of the supply voltage monitoring, ensuring a reset can be triggered even if VDD is within its valid range.
Housed in a compact SOT-23-5 package, the MIC2775-29YM5-TR is designed for space-constrained applications. Its minimal external component requirement—often just a single bypass capacitor—makes it incredibly simple to implement, reducing both board space and overall design complexity. Key characteristics include low quiescent current, making it suitable for battery-powered portable devices, and high levels of accuracy in its voltage monitoring.
ICGOODFIND: The MIC2775-29YM5-TR is an essential component for enhancing system reliability. Its robust combination of precise voltage monitoring, a guaranteed manual reset function, and a tiny form factor makes it an ideal choice for a vast array of applications, including embedded systems, industrial controls, telecommunications hardware, automotive electronics, and consumer appliances. It provides designers with a simple, effective, and reliable solution to mitigate the risks associated with power-related faults.
Keywords: Microprocessor Supervisor, Manual Reset, Voltage Monitoring, System Reset, Power Management IC.
