BU4922FVE-TR

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Type:	Simple Reset/Power-On Reset
Number of Voltages Monitored:	1
Output:	Push-Pull, Totem Pole
Reset:	Active High/Active Low
Reset Timeout:	--
Voltage - Threshold:	2.2V
Operating Temperature:	-40°C ~ 125°C (TA)
Mounting Type:	Surface Mount
Package / Case:	SOT-665
Supplier Device Package:	5-VSOF
Base Part Number:	BU4922

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Introduction

The BU4922FVE-TR is a cost-effective PMIC (Power Management Integrated Circuit) supervisory device designed to protect microcontrollers from overvoltage and undervoltage, over current, over temperature, and other external events. It combines several protection functions including active reset, active low signal output, watchdog timer with reset pulse generation, voltage monitoring and power-on reset and brown-out detection.

Features

The BU4922FVE-TR offers a cost effective way to protect microcontrollers from overvoltage and undervoltage and other events. The device incorporates an active low reset output, a watchdog timer with reset pulse generation, a voltage monitoring circuit, and a power-on reset circuit. The active low reset output latches the output off when a fault is detected, providing a reliable means to manually or automatically reset the system. The watchdog timer provides a means of resetting the microcontroller if the software appears to have stalled by generating a reset pulse if a certain period of time elapses without the software clearing the watchdog. The voltage monitoring circuit monitors the supply voltage for over or undervoltage conditions, and signals the reset output when these conditions occur. The power-on reset circuit provides an effective reset signal during initial power-up, as well as preventing false reset signals due to noise spikes or glitches.

Applications

The BU4922FVE-TR is ideal for use in a variety of applications, such as system/power down monitoring, high current on/off protection, low power monitoring, system restore on power up, and brownout detection.The device is designed to protect microcontrollers in industrial, automotive, and consumer applications, including those in embedded systems, automotive systems, process control systems, data communication systems, precision measurement systems, home appliances, and motor controllers.

Working Principle

The BU4922FVE-TR operates by monitoring the system voltages supplied to the microcontroller and generating an active low reset output if any of these voltages exceed the specified threshold levels. The reset output is latched off and remains off until the reset input is asserted or the supply voltage returns to its normal state. Additionally, the watchdog timer has its own input, referred to as the work-rest pin. If the watchdog timer goes unused then the work-rest pin should be tied to ground. The watchdog timer generates a reset pulse if the work-rest pin is not reset within a certain period of time.The voltage monitoring circuit constantly monitors the system voltage for over and undervoltage conditions. If an over or undervoltage condition is detected, the reset output is triggered, indicating a fault and resetting the system. The power-on reset circuit prevents false signals due to noise spikes or glitches by monitoring the voltage level during power up and restoring the system to its initial state if the voltage exceeds the specified threshold.

Conclusion

The BU4922FVE-TR is a low cost PMIC supervisory device that offers a number of protection functions for microcontrollers. It uses active low reset output, a watchdog timer with reset pulse generation, a voltage monitoring circuit and a power-on reset circuit to detect and respond to faults and events. The device is designed to protect microcontrollers in industrial, automotive, and consumer applications, allowing you to protect your system from damage caused by voltage irregularities, noise and other external events.

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