BD4938FVE-TR

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A PMIC supervisor is one of the most important and indispensable system components. Its function is to monitor the core supply voltages and other critical system signals, and when certain conditions are met, the supervisor will take appropriate action to assure system reliability. The BD4938FVE-TR is a supervisor device designed for the protection of a given circuit and to provide system reliability in the event of power supply and short-circuit issues.

The BD4938FVE-TR is a general-purpose voltage detector that functions as a supervisor in various applications. It is a highly integrated single-channel device that includes a voltage reference circuit, a comparator circuit, a power-on reset (POR) timer, and a low voltage monitoring circuit. The voltage reference is derived from a bandgap reference to provide a stable reference voltage (VREF) between 0.5V and 4.5V. A comparator circuit is used to compare the VREF voltage to the voltage of an external sensing pin (VSNS). When the voltage at the VSNS pin drops to within a predefined hysteresis range of the VREF pin, the device will reset the system. The device also includes a power-on reset (POR) timer, which is used to reset the device after power has been applied to the system.

The BD4938FVE-TR has several features that make it a suitable supervisor for various applications. First, it has a wide operating range from 2.6V to 5.5V, which allows it to work in a broad range of power supply conditions. Second, it comes with an adjustable POR timer which can be used to ensure that the system is reset correctly. Third, it supports multiple wake-up functions including the resetting of multiple microcontrollers or logic regions. Finally, it can be used to detect low voltage conditions such as power supply brownouts and completely reset or shut down the system. Additionally, it includes a standard I2C interface which allows it to communicate with other devices or microprocessors on the system.

The BD4938FVE-TR is suitable for several applications such as regional power monitoring, system power protection and reset, low voltage detection, and battery-backup monitoring. These applications can be found in a wide range of devices such as notebook computers, tablets, smartphones, and electrical meters. With its wide operating range, adjustable POR timer, and multiple wake-up functions, the BD4938FVE-TR is an ideal choice for many applications.

Let\'s take a look at how it works. The BD4938FVE-TR is on standby while the system is powered up and the voltage at the VSNS pin is at or above the VREF. When the voltage at the VSNS drops below the VREF, the device\'s comparator will detect the change and the reset process will begin. The POR timer will then activate and delay the reset process for a predetermined amount of time. Finally, the device will generate a reset signal which can be used to reset the system or shut it down completely.

The BD4938FVE-TR is a highly integrated and reliable supervisor device that can provide system reliability in many applications. With its wide operating range and adjustable POR timer, it is an ideal choice for many applications. By monitoring the voltage at the VSNS pin, it can detect faults and take appropriate actions such as resetting the system to ensure system reliability. Therefore, it is a vital part of a system\'s power supply, reset, and protection features.

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