MAX693ACPE+

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Power Management Integrated Circuit (PMIC) can be seen as one of the most important type of Integrated Circuits (IC) in the electronic industry. It provides a wide variety of integrated functionalities to reduce component counts, reduce board size, and improve power and signal integrity. One of the most common type PMICs is the Supervisors. This component regulates the core power supply lines and manages power-up/ power-down sequencing to guarantee the system operation under all operating conditions. To further illustrate this type of component, this article will focus on the MAX693ACPE+ Supervisors and discuss its application field and working principles.

Overview of The MAX693ACPE+ Supervisors

The MAX 693 Supervisors is a single-chip system supervisor designed to monitor three supply voltages. It features reset/interrupt system management circuits, reverse-current blocking, a watchdog timer, and up to four protected CMOS outputs. Moreover, the maximum low supply voltage is 3.6V and the maximum high supply voltage is 5.5V, providing the user with an extensive operating voltage range. The component has two open-drain outputs, a reset output, and an interrupt output.

The reset output is an active-low with an open-drain output voltage of 0V. The reset output is pulled up to VCC with an external resistor. The interrupt output is an active-low open-drain output voltage whose default state is 0V. The interrupt output is linked with the reset output using an optical OR gate so that one of the outputs will be asserted when its input conditions are met.

In a typical application, the MAX 693ACPE+ will monitor the power system to ensure that the system voltages are within its tolerance range. If one of the system voltages is out of range, the component will generate a reset signal, causing the system to reset. A watchdog timer allows the user to set a time-out period to reset the system.

Application Fields of the MAX 693ACPE+ Supervisors

The MAX 693ACPE+ is a popular component used in a variety of applications, such as embedded systems, industrial, automotive, telecommunications, and many other situations. For example, the component can be used in a portable device to extend battery life; since the MAX 693ACPE+ can detect the battery voltage and generate a reset signal when the battery voltage is too low. In addition, it is also used in computer systems, where it monitors the power supply voltage and reset or shut down the system when the voltage is out of range.

The component is also used in LED backlighting applications. By monitoring the LED current and setting an over-current protection threshold, the component can detect if the LED current is out of range, and generate a reset signal to shut down the LED circuit, reducing system damage caused by excessive LED current.

Furthermore, automotive systems, such as engine control and transmission control systems, typically require a system supervisor to ensure that the system voltage is within safe operating levels. The MAX 693ACPE+ provides this type of protection and can be used in conjunction with other types of electronic components to form a complete automotive system.

Working Principles Of The MAX 693ACPE+ Supervisors

The MAX 693ACPE+ Supervisors works based on voltage, current, and temperature sensing. The component will normally monitor three power supplies. It will compare whether the voltage of each power supply is within the tolerance range or not. Once it detects a voltage that is out of range, it will assert the reset or interrupt output. In general, the reset output will cause the system to reset, while the interrupt output will initiate a system shutdown procedure.

The component also includes a watchdog timer. This timer can be programmed using an external capacitor. It will reset the system if the watchdog timer counts down to zero. If a system error is detected, the watchdog timer will be reset; if the system errors keep happening, the watchdog timer will count down and reset the system if the time is exceeded.

Furthermore, the component can provide reverse-current protection. This function is important in protecting the power supplies in case of a reverse current flow. It will detect an excessive reverse current flow and shut down the system, avoiding possible damages to the power supplies.

Last but not least, the component can also provide over-current protection when used in LED applications. The MAX 693ACPE+ is able to detect when the LED current is out of range and generate a reset signal to shut down the LED circuit, thereby protecting the system from further damage.

Conclusion

To sum up, the MAX 693ACPE+ is an advanced system supervisor designed to provide system protection in a variety of applications. The component can monitor three system voltages, and generate a reset or interrupt output when a system voltage is out of range. Additionally, it provides a variety of other functions, such as a watchdog timer, reverse-current protection, and over-current protection. As such, the MAX 693ACPE+ is a popular choice for embedded systems, automotive systems, telecommunications systems, and many other applications.

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