MAX1232CPA

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Integrating power supply chips and supervisors into one package, MAX1232CPA is one of the most broadly used PMIC-Supervisors. It monitors system voltage and ensures it stays within defined limits, providing over-voltage protection and allowing system reset or power down in case of failure.

The MAX1232CPA is a three-terminal powered system supervisor which operates from a single supply. It provides power-on reset (POR), under-voltage monitoring, over-voltage protection, brownout protection, and watchdog timer reset. Additionally, the MAX1232CPA offers programmable power-on reset delays ranging from 250ms to 2.6s.

This device is designed for a wide range of applications, including computers, peripherals, modems, and embedded controllers. It offers superior reliability, safety, and power supply tracking for critical applications.

Applications

The MAX1232CPA is suitable for a wide range of applications where over-voltage protection and power-on reset is required. It is especially useful in desktop PCs and servers, peripherals and embedded systems.

The integrated over-voltage protection (OVP) of the MAX1232CPA helps prevent system damage by cutting off power when input voltage exceeds the specified level. The adjustable power-on reset (POR) delay function provides flexibility in power-on reset timing and system reset timing, allowing users to optimize system performance. The adjustable watchdog timer feature helps ensure reliable system operation and safe rebooting.

Working Principle

The MAX1232CPA is a dual-channel supervisor which provides voltage monitoring and OVP protection. It offers high immunity to noise, combined with low power consumption and a wide supply voltage range.

The core of the MAX1232CPA is a bandgap voltage reference circuit which is used to compare two separate voltage inputs. The two voltage inputs are the 1V supply and the 3.3V supply. The bandgap reference circuit is designed to be very accurate, and is precision-engineered to compare voltages with 1% accuracy. If either voltage exceeds a pre-determined limit, then the integrated protection circuit will automatically shut off power or trigger a reset.

The MAX1232CPA includes an adjustable power-on reset delay circuit with a time range of 250ms to 2.6s. This allows the user to adjust the time interval at which the system powers on, allowing it to optimize the boot time. Additionally, the circuit includes an adjustable watchdog timer setting, which can be used to trigger a system reset if the system fails to respond due to a hard crash or other unexpected event.

Conclusion

The MAX1232CPA is a powerful and versatile PMIC-Supervisor designed for a wide array of applications. Its core features include OVP protection, adjustable power-on reset delay and an adjustable watchdog timer. With its superior noise immunity, low power consumption and wide supply voltage range, the MAX1232CPA brings enhanced reliability, safety and power supply tracking to embedded and critical systems.

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