MAX6332UR20D3-T

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MAX6332UR20D3-T is a supervisor module manufactured by Maxim Integrated which is used to track, regulate and perform safety checks in a wide range of applications. It is categorized under PMIC (Power Management Integrated Circuit) ─ Supervisors, which are specialized semiconductors that safeguard microcontroller-based systems, ensure their reliable start-up, and protect them against unexpected over or under-voltage faults. Supervisors also provide reset signals for quick recovery from any abnormal condition even at the least expected situation during operation.

The MAX6332UR20D3-T is a 3 V micropower reset supervisor with a pre-detect voltage threshold that ranges from 1 V to 3 V. This module designs an interrupt generator which, when the VCC supply rails are lower than the pre-defined threshold, the generated interrupt can be used for an early warning, allowing for time critical responses. It boasts an extended temperature range from -40 °C to +85 °C and guarantees a push-pull reset output with an active-low reset polarity. Furthermore, it features a low-quiescent current consumption of 605 nA and is backed with a 2 ms reset pulse width.

The MAX6332UR20D3-T module is equipped with UVLO (Under Voltage Lockout) inputs, which will detect dips in the external power supply and provide a reset if the voltage conditions go outside of a set safety margin. The UVLO thresholds are factory set depending on the model, from 2.5 V to 5 V, and include a hysteresis to prevent spurious reset signals. Additionally, the device offers an internal reset threshold with a safety margin which is adjustable with an external capacitor, the duration of the reset should the rails persistically drop or rise, can also be adjusted by altering the external capacitor.

This module can be employed in a variety of applications, ranging from industrial to automotive related circuitry. Its broad usage arises from the need of maintaining the safe and expected operation of the system, whatever the circumstances. Supervisors such as the MAX6332UR20D3-T are specifically designed to provide reliable protection to the system, and are employed in telecommunication, power supplies, and in the automotive sector (where functionality, stability and safety protocols are always demanded).

Another application in where this reset supervisor is regularly used, is in monitoring circuits in servers and other data-processing equipments. In this context, it is required to provide a continuous health check to the system and a quick reset signal in case of over-voltage or under-voltage faults, since these fluctuations can damage the electronic components running at higher voltages. By detecting a VCC interruption and providing a quick reset signal, the supervisor helps in protecting the entire system.

The working principle of the MAX6332UR20D3-T can be broken down in three simple steps. Its internal circuit monitors the VCC supply voltage and compares it against the predefined threshold. If the voltage drops below the lower logic threshold, or rises above the upper logic threshold, the internal logic triggers a reset signal with an active-low polarity and a 2 ms positive pulse width. Then, the voltage is continuously monitored to ensure a reliable NO-RESET signal once the voltage is stabilized above or below the defined levels.

In order to complete the design of the MAX6332UR20D3-T, the designer should incorporate an external capacitor (or network of capacitors) in order to fine-tune the desired reset threshold. It is highly recommended to use a proper ESR calculation tool to determine the exact values of external capacitance needed, while complying with the total capacitance of 1 μF.

In conclusion, the MAX6332UR20D3-T module is a reliable solution for those who need a fast and accurate reset-generation in case of over-and under-voltage fault detections. It provides extended temperature range, low-quiescent current consumption, and adjustable threshold levels. It is employed in a wide range of applications, including industrial, power supplies, telecommunication, and data-processors, where it protects the system from unexpected drops or rises in supply voltages.

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