Description:
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<br />100% brand new and high  quality
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<br />feature:  DS3231 is a low-cost, extremely accurate I2C real-time clock (RTC), with an integrated temperature-compensated crystal oscillator (TCXO) and crystal. The device incorporates a battery input, disconnect the main power supply and maintains accurate timekeeping. Integrated oscillator improve long-term accuracy of the device and reduces the number of components of the production line. The DS3231 is available in commercial and industrial temperature ranges, using a 16-pin 300mil SO package.
<br />   RTC 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. The clock 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. Address and data are transferred serially through an I2C bidirectional bus.
<br />   A 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. In addition, / RST pin is monitored as generating  P reset manually.
<br />Save time and high precision addition, DS3231 also has some other features that extend the system host of additional features and a range of options. The device integrates a very precise digital temperature sensor, through the I2C * interface to access it (as the same time). This temperature 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. If the main power failure, the device can continue to provide accurate timing and temperature, performance is not affected. When 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.
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<br />Module parameters:
<br />1. Operating voltage: 3.3 - 5.5V
<br />2. Clock chip: high-precision clock chip DS3231
<br />3. Clock accuracy: 0-40   range, the accuracy of 2ppm, the annual error of about 1 minute
<br />4. With 2 calendar alarm clocks
<br />5. Programmable square wave output
<br />6. Real-time clocks generate seconds, minutes, hours, days, dates, months and years, and provide leap year compensation up to 2100
<br />7. The chip comes with a temperature sensor, the accuracy of ± 3  
<br />8. Memory chip: AT24C32 (storage capacity 32K)
<br />9.IIC bus interface, the maximum transmission speed of 400KHz (operating voltage of 5V)
<br />10. Can cascade other IIC devices, 24C32 address can be modified by short circuit A0 / A1 / A2, the default address is 0x57
<br />11. With rechargeable battery LIR2032, to ensure that the system power, the clock is normal to move
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<br />Wiring instructions (Arduino uno r3 example):
<br />SCL   A5
<br />SDA   A4
<br />VCC   5V
<br />GND   GND
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<br />color: as the picture shows
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<br />size: app  38*22*14 mm
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<br />package: 1 pcs module in a pack