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DS3231 is a low-cost, extremely accurate I2C-real time clock (RTC), with an integrated temperature-compensated crystal oscillator (TCXO) and crystal system. The device includes a battery input, disconnects the main power source, and maintains precise timing. Integrated oscillator improve the long-term precision 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.
RTC keeps seconds, minutes, hours, day, date, month and in the information year. Less than 31 days of the month, the end date will be adjusted automatically, including corrections for the leap year. The clock works both in the 24-hour bandwidth / AM / PM indication of the 12-hour format. Provides two configurable alarm clock and calendar can be configured for one square wave output. Address and data are serially transferred through an I2C bidirectional bus.
A precision-reference temperature and compensated voltage comparator circuit monitors the VCC status to detect power failures, provide a reset output and, if necessary, automatically switches to the backup power supply. In addition, / pin RST is monitored as far as the μP generation redefines manually.
Saving time and adding high accuracy, DS3231 also has some other features that extend the system's host of additional features and a range of options. The device integrates a very precise digital temperature sensor through the I2C * interface to access this (as at the same time). This precision temperature sensor is ± 3 ° C. On-chip power supply control circuit can automatically detect and manage the main and reserve power (ie low-voltage battery) to switch between the source food. If the main power failure, the device can continue to provide the exact time and temperature, the performance is not affected. When the main power re-supply or voltage value returns to within the allowed range, the on-chip microprocessor reset function can be used to restart the system.
1 size: 38mm (length) * 22mm (W) * 14mm (height)
2 weight: 8g
3 operating voltage: 3.3-5. 5 V
4-chip watch: high-precision clock chip DS3231
5 Precision of the watch: 0-40 ° range, 2ppm precision, error was about 1 minute
6 calendar alarm clock with two
7 programmable square-wave output
8 Real time clock generator seconds, minutes, hours, day, date, month and calendar year and provide valid until the year 2100 of leap year compensation
9-chip temperature sensor comes with an accuracy of ± 3 °
Memory chips 10: AT24C32 (32K storage capacity)
11. IIC bus interface, the maximum transmission speed of 400 KHz (working voltage of 5 V)
12 can be connected with another IIC device, addresses can be short A0 24C32 / A1 / A2 modify default address is 0x57
LIR2032 13 with rechargeable battery, to ensure that the system after power failure, the watch move any normal natural
14 Packing: single anti-static packaging
Wiring instructions (for Arduino uno r3 for example):
SCL & rarr; A5
SDA & rarr; A4
VCC & rarr; 5 V
GND & rarr; GND
5PCS* DS3231 (tested good anti-static packaging)
Note: do not include battery,, it is not safty for ship by airmail. I hope you can understand