SG1544J-883B

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PMIC (Power Management IC) is an essential type of integrated circuits that are used to provide and regulate power in different types of electrical systems. Among the many types of PMICs, Supervisors are a common form, and SG1544J-883B is one of the popular ones available. This application note will provide a brief overview of the application field of SG1544J-883B as well as its working principle.

Application Field of SG1544J-883B

SG1544J-883B is typically used to provide basic power monitoring, supervisor, and control functions in a variety of power-sensitive applications. It is ideal for applications that require precise control and monitoring of voltages and currents, such as personal digital assistants (PDAs), personal computers, cell phones, network routers, and digital cameras. Furthermore, the SG1544J-883B is designed to operate in space-constrained and power-sensitive environments. It is also suitable for use in automotive and industrial electronic applications.

Working Principle of SG1544J-883B

The SG1544J-883B is a voltage supervisor that combines a voltage monitor, a true window comparator, and a watchdog timer. The supervisor works in three functional stages: initiation, step-down, and monitoring. In the initiation phase, the device powers up and performs a voltage reset. During step-down, the device supervises the voltage supply. Finally, once the voltage supply is stable, the device monitors the voltage supply and triggers a reset if there\'s a voltage drop. The purpose of the watchdog timer is to generate a reset signal if the voltage supply fails to restore within the set time.

Before its protection functions are triggered, the SG1544J-883B displays power good indication when the voltage is within the set threshold. The device monitors the voltage between two preset voltage limits: high and low. When the voltage passes beyond either of these thresholds, the device will generate an Active-Low RESET signal. The output can be configured as either open-drain or push-pull to control the reset activities.

The SG1544J-883B also features an independent watchdog timer to provide a reset signal when the system behaves in an abnormal way. The timer is started and stopped as commanded using an externally supplied clock, and the reset pulse width is externally adjustable.

Conclusion

The SG1544J-883B is a popular PMIC Supervisor ideal for a wide range of power-sensitive applications. Its working principle involves a three-stage process wherein it initiates, steps down, and monitors the applied voltage. It is designed to provide reliable power monitoring, supervisor and control functions and comes with an independent watchdog timer to detect abnormal system activities and reset it if necessary. For the applications discussed above, the SG1544J-883B can provide the necessary protection and monitoring to ensure reliable and safe operation.

This application note provided a brief overview of the application field as well as the working principle of the SG1544J-883B PMIC Supervisor. With the right knowledge and understanding of the device\'s features, it is possible to use it to improve the performance and reliability of the power system.

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