MAX795SCPA+

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The MAX795SCPA+ supervisory circuit with its dynamic reset technology is highly appreciated in the industrial and consumer electronics industries for its quick response, accuracy and robust protection. Maxim Integrated has designed this device to monitor the voltage level in battery applications, such as those used in industrial equipment, that require the highest level of reliability and safety. In this article we will take a look at the MAX795SCPA+ application field and working principle.

Application field

MAX795SCPA+ is a micro power supervisory circuit with a push/pull output for microprocessor reset control. It also offers an additional bidirectional open drain reset output that can be used for system monitoring or battery detection. The MAX795SCPA+ is ideal for monitoring backup sources, battery voltage and power supply voltage levels in portable applications, or in any application where low voltage monitoring is required. This device is available in SOT23, SOIC-8 and SSOP-16 packages, making it easier to incorporate into modern designs.

Working principle

The MAX795SCPA+ is a reset monitoring circuit that compares an internal voltage reference with an externally applied voltage. When the input supply voltage drops below the factory preset level, the MAX795SCPA+ quickly initiates an active low reset signal. This reset signal remains asserted until the input supply voltage rises above the reset threshold level. The device provides an active low reset signal that can drive logic circuitry directly through an internal transistor. Alternatively, an external transistor can be used to drive higher loads. The device requires a 3 V to 15 V operating supply range and its operation temperature range is -40°C to +85°C.

The MAX795SCPA+ also features a timeout circuit that delays the active low initialization of the reset output until [Time_delay] seconds after power is applied. This feature helps reduce system startup time. Additionally, the reset output has an interruptible active low feature that allows the reset output to stay active even if the input supply voltage rises above the reset threshold. This feature will be useful in systems where the fault condition needs to be isolated from the system.

Conclusion

The MAX795SCPA+ is a useful supervisory circuit for applications where reliable and quick response monitoring of the input supply voltage is required. With its active low reset signal, interruptible active low feature, timeout circuit and push/pull output, it can protect a system against undervoltage or overvoltage conditions. It is ideal for portable applications, backup sources and any application where low voltage monitoring is needed.

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