BU4940FVE-TR

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BU4940FVE-TR is a highly integrated general-purpose supervisor chip developed by ROHM for ASIC, FPGA, and microcontroller applications. The chip consolidates a supervisory circuit with a current source and a voltage source, which offers system reliability and improves productivity. The chip features an overtemperature monitoring circuit with an adjustable threshold, as well as a watchdog timer and reset control circuitry.

BU4940FVE-TR applications include system power supply and electronic system supervision. It is used as a power source and voltage regulator in various circuits including microcontrollers, FPGAs, and ASICs. It also includes an overvoltage, overtemperature, and reset control circuits, which provide system reliability and safe operation. With its low quiescent current, it is an ideal application for battery-powered devices.

The working principle of BU4940FVE-TR is based on the blocking of current flows of a DC circuit. Inside the chip, a voltage source and a current source are used to facilitate the control and monitoring of the system voltage. The voltage source is then connected to an op-amp, which compares the system voltage to the user-set threshold voltage and provides an output, depending on whether the system voltage is above or below the threshold level. The current source is then used to control the flow of current in the circuit, either increasing or decreasing the current depending on the output of the op-amp.

The chip features an overtemperature monitoring circuit with an adjustable threshold and the ability to detect the temperature of the board. It can also detect the leakage of current and automatically reset itself when an abnormal leak of current is detected. Additionally, it includes an adjustable watchdog timer and reset control resources, which are used to detect system reset conditions.

In summary, BU4940FVE-TR is a versatile system supervisor chip developed by ROHM for ASIC, FPGA, and microcontroller applications. It offers system reliability and improves productivity by consolidating a supervisory circuit with a current source and a voltage source inside the chip. The chip is used as a power source and voltage regulator in various circuits, and also includes an overtemperature monitoring circuit with adjustable thresholds, a watchdog timer and reset control circuitry, as well as overvoltage and reset control circuits. All these features make BU4940FVE-TR an ideal solution for battery-powered devices.

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