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, which can still maintain the timing when the main power supply is disconnected. The integrated crystal oscillator improves the long-term performance of the device and reduces the number of components in the production line. Ds3231 provides commercial and industrial temperature range, and adopts 16 pin 300mil so package.
RTC saves the information of seconds, minutes, hours, weeks, dates, months and years. For months with less than 31 days, the date of the end of the month will be automatically adjusted, including the correction of leap years. The working format of the clock can be 24 hours or 12 hours with / AM / PM indication. Provide two settable calendar alarm clocks and one settable square wave output. The address and data are transmitted serially through I2C bidirectional bus.
Precise and temperature compensated voltage reference and comparator circuit is used to monitor VCC status, detect power failure, provide reset output, and automatically switch to backup power supply when necessary. In addition, / RST monitoring pin can be used as a generator ¥ì P manual input for reset.
In addition to high timing accuracy, ds3231 also has some other functions, which expand the additional functions and selection range of the system host. A very digital temperature sensor is integrated into the device, which can be accessed through the I2C * interface (like time). The accuracy of this temperature sensor is ¡¾ 3 ¡Æ C. The on-chip control circuit can realize automatic power detection and manage the power switching between the main power supply and the standby power supply (i.e. low-voltage battery). If the main power supply is powered off, the device can still continue to raise the timing and temperature of the, and the performance will not be affected. When the main power supply is powered up again or the voltage value returns to the allowable range, the on-chip reset function can be used to restart the system microcontroller.
Module parameters:
1. Dimension: 38mm (L) * 22mm (W) * 14mm (H)
2. Weight: 8g
3. Working voltage: 3.3-5.5v
4. Clock chip: high precision clock chip ds3231
5. Clock accuracy: within the range of 0-40 ¡É, the accuracy is 2ppm, and the annual error is about 1 minute
6. With 2 calendar alarm clocks
7. Programmable square wave output
8. The real-time clock generates second, minute, hour, week, date, month and annual timing, and provides leap year compensation valid until 2100
9. The chip is equipped with a temperature sensor with an accuracy of ¡¾ 3 ¡É
10. Memory chip: at24c32 (memory capacity 32K)
11. IIC bus interface, transmission speed 400kHz (when working voltage is 5V)
12. Other IIC devices can be cascaded. The address of 24c32 can be modified by short circuit A0 / A1 / A2. The default address is 0x57
13. CR2032 with battery ensures that the clock moves normally after the system is powered off
14. Packaging method: single anti-static packaging
Wiring instructions (take Arduino uno R3 as an example):
SCL¡æA5
SDA¡æA4
VCC¡æ5V
GND¡æGND
Shipping list:
1. One ds3231 module