ICL7665EPA

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PMIC (Power Management Integrated Circuit) has become an important supporting component in power management design. In particular, Supervisors are the most popular products in PMIC. Supervisors are responsible for monitoring certain power parameters of the system, so that when the parameter exceeds the set value, the microcontroller can take appropriate action to protect the system from damage. ICL7665EPA is one of the most widely used Supervision IC in industrial, automotive and consumer applications. In this article, we will look at the application fields of ICL7665EPA and its working principle.

Application Field

The ICL7665EPA is used in power management design to monitor and protect against voltage faults, such as over voltage and under voltage conditions. It is usually used in the following areas:

• Industrial applications, such as automotive and industrial control systems
• Consumer applications, such as computers, phones, home appliances and gaming systems
• Telecommunications and data processing systems

The ICL7665EPA is also used in automotive applications, such as electronic brake systems, engine control units, body control modules, transmission control units and antilock brake systems. It is used in these applications to monitor the battery voltage and to protect the system from high or low voltage.

Working Principle

The ICL7665EPA derives its power from an external input supply, which is typically in the range of 2.5 to 18 volts. A voltage comparator is used to monitor the input voltage, and when the voltage reaches a certain level, the comparator triggers an output. The output is called a System Reset signal, which can be used to reset the microcontroller or other circuit elements.

The chip also includes a general-purpose Output (GPOUT). This is a manual reset output pin and can be used to reset other parts of the system. GPOUT can either be configured to reset the system immediately upon detecting an input trigger, or to remain held high or low even after the trigger has been removed. It is used to indicate the status of the input voltage and can be used to optimize battery life.

The IC also has an adjustable threshold setting of high and low voltage, which is used to define the voltage during which the output is triggered. This threshold can be adjusted between 2.5 to 18 volts in 0.1 Volt increments. The ICL7665EPA also supports precision tolerance with a maximum of ±10%.

Moreover, the ICL7665EPA also has a power-on reset (POR) circuit. When a system reaches its start-up power-on state, the POR circuit detects the transition from a low voltage state to the operating voltage state and triggers a reset signal to reset the system.

The chip also includes several interface modes, including I2C, SMBus, SPI and USB. The I2C interface mode provides two-wire and three-wire connection, allowing for easier communication. The USB interface mode allows for communication with a personal computer for debugging and calibration.

The ICL7665EPA also supports various advanced features, such as programmable Watchdog timers, programmable glitch filters, power-on resetwatches, and programmable voltage monitor windows. These advanced features increase the flexibility of the ICL7665EPA and make it suitable for a variety of applications.

Conclusion

In conclusion, ICL7665EPA is a highly versatile and powerful Supervisor IC designed to monitor and protect against voltage faults. Its advanced features make it an ideal solution for industrial, automotive and consumer power management design. It is also flexible, allowing for precise monitoring of the input voltage and protection of the system from high or low voltage.

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