BU4840FVE-TR

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Power management integrated circuits (PMICs) are ubiquitously used in today’s electronic devices. These integrated circuits not only manage the power in a system, but also take inputs from the system and perform functions such as resetting to maintain the system’s stability. As one of the most important types of PMICs, Supervisory Circuits (Supervisors) are widely used in applications such as power supplies, microcontrollers, and embedded systems. One example of a Supervisory Circuit is the BU4840FVE-TR. This article will discuss the application field and working principle of the BU4840FVE-TR.

The BU4840FVE-TR is a microprocessor reset circuit which provides a reset action in response to a system power supply or reset input. The core function of this Supervisory Circuit is to provide reset control when the power supply and reset pin conditions meet the threshold level. The BU4840FVE-TR is typically used in mobile devices, telecommunication equipment, point of sale terminals, and security systems, which require an output reset signal in order to maintain the system’s stability and reliability of operation.

As a Supervisory Circuit, the BU4840FVE-TR contains three main components: a reset pin, an input voltage pin, and an output voltage pin. The reset pin is connected to an external reset input and is used to detect the reset signal. The reset pin can be connected to a pushbutton, or to an external reset circuit. When the external reset input is applied to the reset pin, the BU4840FVE-TR will trigger a reset action.

The second component, the input voltage pin, is used to ensure that the input voltage is at an acceptable level for the reset operation to occur. This pin is connected to the system’s power supply or reset circuit and determines if the reset should be triggered. Finally, the output voltage pin is used to indicate the reset output. It has two states – logic high or logic low. When the output voltage pin is logic low, the BU4840FVE-TR is in its reset state.

Under normal operating conditions, the BU4840FVE-TR monitors the power supply voltage and wait for the reset signal. On the falling edge (logic low) of the reset pin, the BU4840FVE-TR will begin to monitor the power supply voltage until the input voltage reached the predetermined threshold. Once the predetermined voltage is reached, the BU4840FVE-TR will generate a reset output (logic low) and held this state until the reset input is removed. Once the reset input is removed, the reset output will return to its previous state (logic high).

In summary, the BU4840FVE-TR is a versatile Supervisory Circuit that provides reset control for a wide range of applications. It monitors the system’s power supply and reset signals, and generates a reset output when both the power supply and reset input signals meet the predetermined threshold. The BU4840FVE-TR is commonly used in mobile devices, telecommunication equipment, point of sale terminals, and security systems.

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