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Introduction to XC6123F644MR-G Application Field and Working Principle

XC6123F644MR-G is a supervisor IC (Integrated Circuit) for digital applications used for supplying regulated voltage and monitoring currents in the devices connected to it. It is typically used in embedded systems, digital equipment and chip design applications thanks to its low power consumption and integrated features. This IC is deployed by manufacturers in several consumer, industrial, and transport products. Typically, XC6123F644MR-G works as a voltage- and current- monitoring device that protects embedded devices from over-voltage and over-current events. It provides a regulated voltage output to supply various voltage levels required by the embedded parts.

Features of XC6123F644MR-G

XC6123F644MR-G is a 3- phase, non-isolated low profile 8.0mm x 8.0mm module. It has a total of nine pins (impressed with silk-screening) distributed on the package, including four power pins, two control pins and three ground pins. It supports 3.3 V single voltage operation with an output voltage of up to 2.8 V. Its operating temperature range is -55°C to +125°C and it has a 0.5% load regulation accuracy.

• It can measure up to four rail voltages: VDDA, VDDIO, VDD3 & VDD4.
• It includes a P-channel MOSFET output buffer.
• It features a power-down function. The internal feedback of XC6123F644MR-G will decrease the output voltage as soon as the power is cut off.
• It offers two output-sensing pins: GXO & SBXO.
• It has an ESD rating of up to ±8kV.

XC6123F644MR-G has two different functions: voltage monitoring and current monitoring. The voltage monitoring function is conducted with the voltage monitor, which is used to detect the rail voltage value by reading the Output Voltage (VOUT) port on the pins. The current monitoring function is realized by the integrated current monitor, which is designed to measure the current of the power rail. It enables auto-restart and over-current protection for up to 4.5A of load current, with an over-current threshold of 400mV.

Working Principle of XC6123F644MR-G

XC6123F644MR-G utilizes the over temperature and over voltage protection principle for its operating. Its input power is compared to the reference voltage and feed back to the system in the form of monitor output. When the external power is overvoltage or over temperature, then the monitor output will be higher than the reference voltage, which triggers the output enable and reduce the input current.

The IC consists of an N-type MOSFET (B2Q) connected to the Power-On Reset (POR) pin, which controls the enable/disable logic of the IC. The output logic of this IC is enabled when the POR pin is grounded, and disabled when the POR pin is not grounded. XC6123F644MR-G will not start operating until the POR pin goes high, and then the voltage monitor is enabled and it enters the steady state.

Once the POR pin is released from main power, XC6123F644MR-G will measure the voltage of the rail and send this information back to the system in the form of a monitor output. If the detected voltage is greater than the reference voltage, the POR pin will be triggered and the output voltage will be reduced. When the voltage falls back to the rated voltage, the output logic is enabled and the output voltage will be turned back on. In this way, the XC6123F644MR-G can detect and control the voltage of the rail.

Conclusion

XC6123F644MR-G IC is specially designed as a supervisor and is used as a voltage and current monitoring device for embedded systems and digital equipments. Besides its monitoring and control functions, it has a power-down function that reduces the output voltage when it is powered off. Moreover, the IC has an ESD rating of up to ±8kV, making it suitable for commercial and industrial applications.

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