["brand new and high quality\r\nLow-cost, extremely accurate I2C real-time clock (RTC),  with an integrated temperature-compensated crystal oscillator (TCXO) and  crystal.\r\nThe device incorporates a battery input,  disconnect the main power supply and maintains accurate timekeeping.\r\nIntegrated oscillator improve long-term accuracy  of the device and reduces the number of components of the production line.\r\nDS3231 available in commercial and industrial  temperature ranges, using a 16-pin 300mil SO package.\r\nRTC maintains seconds, minutes, hours, day, date,  month, and year information. Less than 31 days of the month, the end date will  be automatically adjusted, including corrections for leap year.\r\nClock operates in either the 24 hours or band / AM  / PM indication of the 12-hour format. Provides two configurable alarm clock and  a calendar can be set to a square wave output.\r\nAddress and data are transferred serially through  an I2C bidirectional bus.\r\nA precision temperature-compensated voltage  reference and comparator circuit monitors the status of VCC to detect power  failures, provide a reset output, and if necessary, automatically switch to the  backup power supply. \r\n/RST pin is monitored as generating μP reset  manually.\r\nSave for time and high precision addition, DS3231 also  has some other features that extend the system host of additional features and a  range of options.\r\nThe device integrates a very precise digital  temperature sensor, through the I2C * interface to access it (as the same for time).\r\nTemperature sensor accuracy is ± 3 ° C. On-chip  power supply control circuit can automatically detect and manage the main and  standby power (i.e., low-voltage battery) to switch between the power supply.\r\nIf the main power failure, the device can continue  to provide accurate timing and temperature, performance is not affected.\r\nWhen the main power re-power or voltage value  returns to within the allowable range, the on-chip reset function can be used to  restart the system microprocessor. Note:battery excluded Module parameters:\r\nSize: 38mm (length) * 22mm (for W) * 14mm (height)\r\nOperating voltage :3.3 - 5 .5 V\r\nclock chip: high-precision clock chip DS3231\r\nClock Accuracy :0-40 ℃ range, the accuracy 2ppm,  the error was about 1 minute\r\nCalendar alarm clock with two\r\nProgrammable square-wave output\r\nReal for time clock generator seconds, minutes, hours,  day, date, month and year timing and provide valid until the year 2100 leap year  compensation\r\nChip temperature sensor comes with an accuracy of  ± 3 ℃\r\nMemory chips: AT24C32 (storage capacity 32K)\r\nIIC bus interface, the maximum transmission speed  of 400KHz (working voltage of 5V)\r\nCan be cascaded with other IIC device, 24C32  addresses can be shorted A0/A1/A2 modify default address is 0x57\r\nWith rechargeable battery LIR2032, to ensure the  system after power failure, the clock move any natural normal\r\nWiring instructions (for  example): SCL → A5 SDA → A4 VCC → 5V GND → GND\r\nDownload\r\nQuantity: 1pc"]