MIC6315-26D2UY-TR

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Power management integrated circuits (PMIC) are highly versatile components which allow for efficient power handling in electronic products. Among different types of PMIC, supervisors or power supervisors are critical for the reliable operation and proper protection of electronic devices. A critical aspect of supervisors is their ability to detect a variety of fault conditions, like over- and under-voltage, over-temperature, and brown-outs and reset the system, thereby protecting it towards possible damage and ensuring reliable operation. Here, we will focus on MIC6315-26D2UY-TR, discussing its application fields and working principle.

Application Field

The MIC6315-26D2UY-TR, by Microchip, is a high-accuracy intelligent system supervisor, which includes precision on-chip all electro-thermal, voltage and temperature monitoring circuits. It is suitable for any kind of electronic systems which require a reliable monitoring and resetting of low, moderate and high-power devices. Especially, it is suitable for mobile phones as well as IoT devices, robotics, drones and home/office appliances.

With its 0.8% precision voltage monitoring circuitry and active high-current output, the MIC6315-26D2UY-TR is uniquely suited to protect powered systems with increased accuracy and reliability. It also includes a supervisor circuit, with adjustable reset thresholds as well as hysteresis, fault filtering and latching of errors, in order to guarantee the robustness of the protection. Moreover, it has undervoltage protection (UVLO) of -7V, to prevent issues related to a malfunctioning switched power supply, such as excessive current consumption or a faulty voltage regulation.

Working Principle

The principal functioning block of the MIC6315-26D2UY-TR is its Reset/Supervisory Circuit, a type of voltage-to-reset converter. When the input voltage falls below a detrimental voltage threshold, the circuit triggers a reset sequence, setting thus a reset output pin to a low logic state. This reset sequence is typically used to safeguard the system against faults such as over-voltage and brown-outs, or even reset the system after the recovery of a fault condition.

The Reset/Supervisory circuit is connected to an active high-current output driver, which actively monitors the supply voltage and can also activate external signals, such as LEDs, to alert the user of an error condition or to force an auxiliary reset. It is also connected to two trip-point detection circuits, by means of two independent channels. One of these channels is used to detect a low trigger point, used to detect over-current conditions, while the other one is used to detect a high trigger point, used to detect under-voltage.

The heartbeat unit is used to generate a pulse at a predetermined frequency to produce a series of pulses for a predetermined duration, which allows for the sequential cycling of the internal supply voltage at rising and falling thresholds. It is triggered to cycle at a specific rate of time and also allows for a user adjustable format to switch its operation. This can be used for cycling the system at defined intervals or to cycle the system at fault conditions from correct working conditions.

The MIC6315-26D2UY-TR features the temperature monitor circuit, which is used to detect temperature deviations and trigger a reset. A temperature diode and a voltage reference are integrated on-chip. When the external diode’s temperature exceeds the set limit, a reset is activated. The temperature monitor circuit also includes a motor-speed (M/S) selector, which allows for a flexible configuration of the reset threshold.

Finally, the extra output pin is used to enable/disable the reset output pin, allowing to bypass the reset process. Thus, the pin can be used to disable the reset process and automatically ignore a fault, in case of a known event.

Conclusion

In this article we discussed the application fields and working principle of Microchip’s MIC6315-26D2UY-TR power supervisor IC. This highly versatile component provides robust protection for electronic systems, due to its sophisticated on-chip electro-thermal, voltage and temperature monitoring circuits. Specifically, this IC can detect a vast number of fault conditions, like over- and under-voltage, over-temperature and brown-outs, and reset the system in order to protect it from any possible damage. It is therefore ideal for mobile phones, IoT devices, robotics, drones and home/office appliances.

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