ICL7665SACBA

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The ICL7665SACBA is a voltage supervisor with an internal voltage regulator for monitoring two supply voltages and providing two open-drain outputs for interrupt communication. It is well-suited for a wide range of applications where an undervoltage failsafe is needed and it can be used as an extended reset input for microcontroller-related applications. It is a fairly simple yet powerful device with a range of features such as undervoltage detection, overvoltage detection, and brownout detection.

Introduction

The ICL7665SACBA is a voltage supervisor IC with an internal voltage regulator that is designed to monitor two supply voltages, one of 3.3V and the other of 5V, and to provide two open-drain outputs for interrupt communication. The ICL7665SACBA provides protection against undervoltage, overvoltage, and brownout conditions efficiently by monitoring both supply voltages and generating a signal when the voltages are outside the programmed thresholds. At the same time, the ICL7665SACBA provides an extended reset input connected to an internal reset comparator to ensure that a reset signal is available at the appropriate time.

Application Field

The ICL7665SACBA is a voltage supervisor, providing protection against fault conditions in a wide range of applications. For example, the ICL7665SACBA can be used in generic power-device applications (such as power supplies, RFID readers, consumer electronics, flat panel displays, etc) to ensure that an undervoltage failsafe is provided, as well as a voltage monitor, to detect when the power supply voltage is outside the specified limits. Additionally, the ICL7665SACBA can be used in microcontroller-related applications, such as embedded controllers, motor controllers, computing and robotics, to act as an extended reset input, providing a reset signal when necessary. The ICL7665SACBA is also well-suited for all types of automotive applications, where there is a need for a monitor of supply voltage and an overvoltage protection, as well as for medical applications, for monitoring the power supply of medical and diagnostic equipment.

Working Principle

The ICL7665SACBA includes an internal voltage regulator that helps to reduce the no-load operating current of the device while providing an accurate reference source for the voltage supervisor. This voltage regulator has a quiescent current of 2㎃±1㎃ and a power supply range of 2.5V to 6V. Furthermore, the ICL7665SACBA has two external voltage supervisors connected to the voltage regulator, one of which monitors the supply voltage of 3.3V, while the other monitors the supply voltage of 5V. These two supervisors have a power supply range of 3.0V to 6.0V, a hysteresis of 40mV, and can detect undervoltage, overvoltage, and brownout conditions.

When an undervoltage condition is detected, the ICL7665SACBA sends a logic low signal at the PWRGOOD output and an interrupt signal on the INT output. Similarly, an overvoltage condition is detected when the input voltage is greater than the overvoltage threshold, and a logic low signal is sent at the DECLAMP output and an interrupt signal on the INT output. In addition, the ICL7665SACBA has a brownout detect feature that monitors two supply voltages, one of 3.3V and the other of 5V, and when any of these voltages fall below its brownout threshold, the brownout detect feature will send a logic high signal at the BOD output and an interrupt signal on the INT output.

Conclusion

The ICL7665SACBA is a voltage supervisor IC with an internal voltage regulator that is designed to monitor two supply voltages, one of 3.3V and the other of 5V, and to provide two open-drain outputs for interrupt communication. This device is well-suited for a wide range of applications that require an undervoltage failsafe, such as power-device applications, microcontroller-related applications, automotive applications, and medical applications. In addition, the ICL7665SACBA can detect undervoltage, overvoltage, and brownout conditions by monitoring both supply voltages and providing a logic low signal at the PWRGOOD output and an interrupt signal on the INT output for undervoltage detection, sending a logic low signal at the DECLAMP output and an interrupt signal on the INT output for overvoltage detection, and sending a logic high signal at the BOD output and an interrupt signal on the INT output for brownout detection.

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