APX809S-44SR-7

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An APX809S-44SR-7 is a supervisory circuit from Diodes Incorporated. This device is part of the integrated PMIC (power management integrated circuit) family which provide various advanced functions to protect the system from undesired conditions, like high voltage power supply malfunctions, overcurrent and over temperature fault conditions. It is developed to be used in various applications, such as automotive, computing, industrial, telecoms and many other. This article aims to discuss the application field and working principle of APX809S-44SR-7.

Applications of APX809S-44SR-7

The APX809S-44SR-7 is suitable for a wide range of applications and provides many operational advantages, including high reliability and extended operating temperature range from -40 degree Celsius to 125 degree Celsius. Therefore, it is applicable to many different uses in industries, such as automotive, computing, industrial, telecoms and etc.

In automotive applications, the APX809S-44SR-7 provides an ideal solution for monitoring power supply voltage and controlling power sequencing of the system. It is one of the perfect choices to ensure the reliable and accurate power-on/off sequence of the automotive system. It also provides position tracking, power sequencing and battery monitoring functions.

In computing applications, this supervisory circuit provides voltage and temperature supervision and power control. It also provides auxiliary monitoring, such as current sensing, battery monitoring and position sensing functions.

For industrial applications, the APX809S-44SR-7 is suitable to be used in home appliances and factory automation. It provides protection for a wide range of industrial equipment and enables system to work reliably in extreme working environment, like high voltage and temperature.

In telecoms applications, the APX809S-44SR-7 provides necessary protection to prevent damage from overvoltage, overcurrent and over temperature conditions, as well as provides position monitoring, current sensing and system control functions.

Working Principle of APX809S-44SR-7

The APX809S-44SR-7 is composed of two parts, which are controller and driver networks. The controller part checks the input voltage, power good output and reset output. It also has a watchdog timer, which can be adjusted to be reset time period. The driver network consists of power, ground connections, an RST output and PGOOD output.

The microprocessor monitors the input power and uses an internal timer to monitor power-on/off sequence and reset time period. When the input voltage level is higher or lower than stable voltage, the microprocessor will generates a reset pulse to reset the system and protect the system from damage. The PGOOD output signals that the power supply voltage is normal and the system is ready to power on.

The APX809S-44SR-7 is a revised device which combines the features of reset generator and power sequence controller into a single supervisory circuit. It provides a wide range of circuit protection and control functions to ensure system works in a reliable and stable manner even in extreme working environment.

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