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The Wio Extension - RTC is an extension board for Wio LTE, it can provide the Real-Time Clock function via the I2C port. This board is based on NXP PCF8523 chip, which can provide year, month, day, weekday, hours, minutes, and seconds information.
This board is powered by Micro-USB port, communicate with the Wio LTE via I2C port, and we also provide a USB power output which can be turned off/on by a on-board switch, so that you can use the Wio Extension - RTC board to power the Wio LTE. When the power supply to Wio boards ( Like the following picture), the standby current of whole system is less than 1 uA.
To work with the Wio LTE you may also need the Grove cable and USB power cable:
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