IIC EEPROM and RTC Module DS1307 atmel832

With its compact design, this board integrates the DS1307 real-time clock module, AT24C32 EEPROM memory, and a slot for the DS18B20 digital temperature sensor (not supplied), all connected via an I2C bus on a 27mm x 28mm x 8.4mm board.

The DS1307 is a low-power real-time clock chip featuring 56 bytes of non-volatile RAM, with a full BCD code clock and calendar. Address and data are transmitted via a two-wire bidirectional serial bus. The chip provides information such as seconds, minutes, hours, etc., and automatically adjusts the number of days in each month. It also includes a leap year compensation function. The AM/PM flag determines whether the clock operates in 24-hour or 12-hour mode. An integrated power-sense circuit handles power-down detection and battery switching.

The AT24Cxx series of EEPROMs is produced by Microchip (USA). Models ranging from 1 to 512 Kbits support serial CMOS E2PROM with the I2C bus data transfer protocol. They are electrically erasable and programmable with a self-timed writing cycle (including an auto-erase time of no more than 10ms, typically 5ms). The AT24C32, with a 32K-bit capacity, can store 8K (8192) bytes. It supports a 1.8V to 5V power supply, withstands one million erase cycles, and retains data for 100 years. With a 5V power supply, the clock frequency can reach 400 kHz.

The DS18B20 digital temperature sensor uses 1-Wire technology, effectively reducing external interference and improving measurement accuracy. It converts the measured temperature directly into a serial digital signal for computer processing. Its simple interface makes data transmission and processing much easier.

Features

• Dimensions: 27mm x 28mm x 8.4mm
• On-board DS1307 I2C real-time clock chip (RTC)
• On-board 24C32 32K I2C EEPROM memory
• Slot for a rechargeable LIR2032 lithium battery (not supplied) with a charging circuit, solving the DS1307 backup battery issue where read/write is impossible. Once fully charged, it provides 1 year of timing for the DS1307.
• Breaks out the DS1307 clock pin to provide clock signals for the microcontroller.
• Can be cascaded with other I2C devices.