24LC256 PDF

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This part can be programmed by Digi-Key; for details please contact our custom department at x or @ 24LCI/P Microchip Technology EEPROM 32kx8 – V datasheet, inventory, & pricing. 24LCI/ST Microchip Technology EEPROM 32kx8 V datasheet, inventory, & pricing.

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Just remember that when you connecting multiple devices, each one must be unique. This variable is not 24lf256 but it allows us to easily change the address we want to access without going through all of the code and replacing the value.

We then have a for loop, but it contains nothing because a for loop repeats itself over and over again.

Adding External I2C EEPROM to Arduino (24LC256)

We will now explain the hardware connections. With the address pins connected the hardware part of this tutorial is complete and every pin of the 24LC should be connected to either Vcc, GND or the Arduino. The WP pin stands for write-protected and this allows you to control if data can be written to the 24lc26 or not.

We can write anything that we want to it as long as it’s within kilobits of memory and read from it any time we want.


Next we have to send the address on the eeprom we want to write to. In most other kinds of non-volatile memory, this can’t be done. The 24LC operates off a clock signal.

So this is what we will use for this circuit. The SCL pin, pin 6, is the serial clock line.

How to Connect a 24LC EEPROM to an Arduino

The last pin, the WP or Write Protect pin connects to ground. This tutorial was originally posted on the 10kohms. Therefore, the address pins will have a value of Since our eeprom chip has 32, address locations we are using two bytes 16 bits to store the address but we can only send one byte at a time so we have to split it up.

We then create a serial monitor so that we can see our Serial. These are the hardware connections. Since the address pins, in our case, isthe final address remains 0x In this circuit, we’re not interested in disabling the write feature. Next lets go ahead and connect the data pins to the Arduino board. Next we do a bitwise AND to get just the last eight bits. Arduino Sketch Below is the entire tutorial code, scan over it and see if you understand it before I dive into what each section does.

For more information please read http: The clock is used to synchronize data transfer to and from the device between the arduino microcontroller and the EEPROM chip.


We will ground all the address pins. We first call the Wire. The 24LC is an 8-pin chip. Using the image above as a guide lets begin to wire the chip.

Now 24lc26 we need is the code. We need to send the MSB Most significant bits first so we have to shift our address to the right eight bits.

And we connect GND, pin 4, to power ground.

If you are using Arduino 1. Or you can 2l4c256 it to a digital pin of a micrcontroller, so that you can switch between enabling or disabling it. This establishes a clock line so that the master and 24l256 device can work in synchrony. The reason why each EEPROM must have a unique address is because there would be no other way for the microcontroller to address a specific one. This facilitates I 2 C communication. Finally we have to pass along the byte we want to store. Next, we have our setup function.

The breadboard circuit of the circuit above is shown below.