BU4327F-TR Integrated Circuits (ICs)

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BU4327F-TR is a high-performance microcontroller power supply voltage supervisor (MVSS) product developed by ROHM. As a type of power management integrated circuit (PMIC) supervisors, BU4327F-TR can monitor and control key functions of a microcontroller, ensuring the microcontroller system works properly. In this article, the application of BU4327F-TR MVSS and its working principle are discussed.

Application of BU4327F-TR

BU4327F-TR is a microcontroller power supply voltage supervisor (MVSS) which can be used for a variety of microcontroller system applications. Typically, MVSS works in supply voltage monitoring and voltage adjustment applications. With BU4327F-TR, the voltage limiting voltage range and reset voltage respectively can be set from 0.65V to 4.65V, and 0.8V to 5.2V. The monitor accuracy is ±0.2%, and the power-on delay time is 1ms typ.

BU4327F-TR is available in two packages: a 5-pin UDFN (2 x 2 mm) package and a 5-pin SOT-25 package. Both packages demonstrate low power consumption, small size, and built-in reverse current protection. In addition, BU4327F-TR features a power-down input (PD) pin, which enables the device to switch to power-down mode. The supply current is reduced to 0.2 µA (typ.). The operating temperature range is from -40°C to +85°C, effectively meeting the demands for agricultural machinery and other outdoor applications.

ROHM’s BU4327F-TR is ideal for use in a wide range of microcontroller (MCU) systems, from automotive to consumer grade. Since it offers an adjustable resetting voltage with an accuracy of ±0.2%, it is especially well suited for MCU applications that require reliable and accurate power supply monitoring.

Working Principle

The BU4327F-TR monitors the output voltage of the power supply and compares it to the set value. If the voltage is lower than the set value, the device triggers a reset signal. This reset signal can be used to reset the CPU or restart the circuit system.

BU4327F-TR adopts an auto-reset release time setting circuit. After the reset signal is triggered, the auto-reset release time is started. If the voltage value is returned to a valid level prior to completion of the auto-reset release time, the reset signal is released. This helps the circuit system to be restored to an operational state faster. In addition, BU4327F-TR is designed with thermal protection to help the monitoring circuit prevent damage caused by overheat.

BU4327F-TR uses a sigma-delta A/D converter to monitor the power supply voltage. In this process, a comparator checks the operating state of the power supply voltage relative to the pre-set voltage. If the power supply voltage drops below the pre-set voltage, the comparator will give out a reset signal. Furthermore, the monitor circuit implements pre-charging and the power-on delay time to prevent mis-triggering.

ROHM’s BU4327F-TR provides a high performance solution to power supply voltage monitoring and resetting for microcontroller systems. It has a built-in thermal protection and adjustable resetting voltage, which helps to ensure the reliability of the system. With its small size, low power consumption, easy implementation and accurate operation, BU4327F-TR is an ideal choice for power supply monitoring in various applications.

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