Overview:

• High-precision clock chip DS3231

• Memory chip: AT24C32 (storage capacity 32K)

• Operating voltage: 3.3--5.5V

• I2C Real TIme Clock

• Temperature accuracy: ±3 °C. 

Description:

DS3231 high precision clock module 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 that maintains accurate timing when the mains supply is disconnected. The integrated crystal oscillator increases the long-term accuracy of the device and reduces the number of components in the production line. 

RTC saves seconds, minutes, hours, weeks, dates, months, and years. For months less than 31 days, the date of the month will be automatically adjusted, including the correction for the leap year.

Features:

• The working format of the clock can be 24 hours or a 12-hour format with /AM/PM indication. Two configurable calendar alarms and a configurable square wave output are available.

• The address and data are transmitted serially via the I2C bidirectional bus.

• A precision, temperature-compensated voltage reference and comparator circuit is used to monitor the VCC status, detect power failures, provide a reset output, and automatically switch to a backup supply if necessary. In addition, the /RST monitor pin can be used as a manual input to generate a μP reset.

•  The device integrates a very accurate digital temperature sensor that can be accessed via the I2C* interface (as time passes). 

• This temperature sensor has an accuracy of ±3 °C. 

• The on-chip control circuitry enables automatic power detection and manages power switching between the primary and backup power supplies (ie, low voltage batteries). 

• If the main power supply is powered down, the device will continue to provide accurate timing and temperature without compromising performance. 

• The on-chip reset function can be used to restart the system microprocessor when the main power supply is re-energized or the voltage value returns to within the allowable range

Specifications:

• Clock chip: high-precision clock chip DS3231

• Operating voltage: 3.3--5.5V

• Clock accuracy : 0-40 ° C range, accuracy 2ppm, annual error of about 1 minute

• Two calendar alarm clock

• Programmable square wave output

• Real-time clock produces seconds, minutes, hours, weeks, dates, months and years, And provide the leap year compensation valid until 2100.

• The chip has its own internal temperature sensor with an accuracy of ±3 °C.

• Memory chip: AT24C32 (storage capacity 32K)

• IIC bus interface, the maximum transmission speed is 400KHz (when the working voltage is 5V) )

• the IIC may be cascaded to other devices, the address can 24C32 / A1 / A2 modified by shorting A0, 0x57 default address with battery CR2032, to ensure that the system power off, then any normal walking clock

• Size: 38mm x22mm x14mm

• Weight: 8g