I2C Real-Time Clock




$17.99 ea.
$16.19 ea.

The I2C-RTC board is a 6-pin CMOS Real-time Clock device using I2C bus. There are no external components required.

Description [Hide]

The I2C-RTC board is a 6-pin CMOS Real-time Clock device using I2C bus. There are no external components required. Only two signal lines SDA and SCL plus supply voltage and ground are required to be connected. This makes it perfect for embedded systems that require real-time clock.

This board features innovations that set it apart from other real-time clock module. Innovations feature like on-board pull-up resistors, battery holder and power LED. The module can be quickly connected directly on to the breadboard. The board is small and compact in size 0.80 x 1.05 inches.

The I2C-RTC is designed base on DS1340-33 IC. It is a real-time clock (RTC)/calendar including the software clock calibration. The device additionally provides a lower timekeeping voltage, and an oscillator STOP flag. The device is capable of block access for the register map. Two additional registers, which are accessed individually, are required for the trickle charger and flag. The clock/calendar provides seconds, minutes, hours, day, date, month, and year information. A built-in power-sense circuit detects power failures and automatically switches to the backup supply. Reads and writes are inhibited while the clock continues to run.


• Software clock calibration
• RTC counts seconds, minutes, hours, day, date, month and year
• Automatic power-fail detect and switch circuitry
• Low timekeeping voltage down to 1.3V
• Oscillator stop flag
• Stand alone module, no external components required
• On-board I2C pull-up resistors, battery holder and power LED
• Decoupling supply voltage
• Design easy for breadboard
• High quality double sided PCB
• All SMT components
• Small and compact in size 0.80 x 1.05 inches
• Dual row 0.6” width, 0.1” pitch header pins
• Support Fast (400kHz) I2C interface
• Flexible operating power supply voltage range of 2.97V to 5.5V
• Suitable for 3.3V or 5.0V microcontroller

Documentation [Hide]

Related Products [Hide]


FTDI Basic Breakout (5V)

This is a basic breakout board for the FTDI FT232RL USB to serial IC. The pinout of this board matches the FTDI cable to work with official Arduino and cloned 5V Arduino boards.

$14.95 USD


Breadboard Jumper Wire Bundle

This 70-piece flexible wire jumper kit is sure to replace your old-style solid-wire jumpers. These are more flexible, robust, and easy to use!

$6.00 USD


Male Strip Pins - 6 per (Right Angle)

Male Strip - 6 per Strip, gold flash surface on 0.1" spacing. These are bent over at 90 degrees for edge-wise connections.

$0.35 USD


Solarbotics Arduino Freeduino Enclosure (SAFE)

The Solarbotics Arduino Freeduino Enclosure (SAFE) is a laser-cut acrylic case for your chopsticks. And by chopsticks, we mean Arduino or Freeduino. Go figure.

$9.95 USD


IC Hook with Pigtail

These are good quality IC test hooks with a male connection wire. Instead of a single hook, these have two hooks that are capable of grabbing very small points (like DIP IC legs).

$4.95 USD


Arduino Mega 2560 R3

The Arduino Mega 2560 is the open-source "big brother" to Duemilanove/Uno reference design, using the much more capable ATmega2560.

$58.95 USD


Female-to-Female 100mm jumper wires

Ideal for making pin-to-pin connections. These are the products you need. Waaay better than soldering tiny sockets to wires and heat-shrinking them yourself!

$4.95 USD



The MOP-AL162A-BBTW lets your microcontroller display data on a screen of 2 lines x 16 characters per line.

$12.95 USD


6-Pin Shield Stacking Header

Want to stack more than one shield at a time? Use these instead of standard 6-pin headers to add extra functionality to your shield!

$0.45 USD


28-Pin ZIF Socket 0.3" Wide

This is a high-quality, easy to use 28 pin ZIF socket that is 0.3" wide.

$2.95 USD





Remember Me

Forgot Your Password?

Don't Have an Account?
Sign Up!