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DS3231+24Cxx module, full-featured pinout.
Ver1.1 update instructions: Add mirror IIC interface
The DS3231 is a low-cost, high-precision I2C real-time clock (RTC) with integrated temperature-compensated crystal oscillator ( TCXO ) and crystal. The device includes a battery input to maintain accurate timekeeping when mains power is removed. Integrated crystal oscillators improve the long-term accuracy of the device and reduce component count on the production line. The DS3231 is available in commercial and industrial temperature ranges and is available in a 16-pin 300mil SO package. // From: https://baike.baidu.com/item/DS3231/4726096?fr=aladdin
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