DS3231 Memory module

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.
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.
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 μP reset
manually.
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.

Module parameters:
1 Size: 38mm (length) * 22mm (W) * 14mm (height)
2 Weight: 8g
3 Operating voltage :3.3 – 5 .5 V
4 clock chip: high-precision clock chip DS3231
5 Clock Accuracy :0-40 ° range, the accuracy 2ppm, the 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
year timing and provide valid until the year 2100 leap year
compensation
9 chip temperature sensor comes with an accuracy of ± 3 °
10 memory chips: AT24C32 (storage capacity 32K)
11.IIC bus interface, the maximum transmission speed of 400KHz (working voltage of 5V)
12 can be cascaded with other IIC device, 24C32 addresses can be shorted A0/A1/A2 modify default address is 0x57
13 with rechargeable battery LIR2032, to ensure the system after power failure, the clock move any natural normal
14 Packing: single anti-static packaging
Wiring instructions (for Arduino uno r3 for example):
SCL → A5
SDA → A4
VCC → 5V
GND → GND