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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This facilitates I 2 C communication. If you make all 3 address pins HIGH, this is an address of The clock is used to synchronize data transfer to and from the device between the arduino microcontroller and the EEPROM chip. The WP pin stands for write-protected and this allows you to control if data can be written to the eeprom or not. Next lets go ahead and connect the data pins to the Arduino board.

The arguments it accepts are the same first two arguments the write function, the device address and the address on the eeprom to read from. The datasheet for the 24LC can be found at the following link: We then call a for loop reading this value.

This allows the chip time to complete the write operation, without this if you try to do sequential writes weird things might happen. Since this is I 2 C communication, we have to create a Wire object.

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. This variable is not required but it allows us to easily change the address we want to access 24pc256 going through all of the code and replacing the value.

24LC Serial I2C EEPROM K | Microchip

This produces an address of 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. However, there are times where it 2lc256 be very necessary. Therefore, we put all the functions in the setup function and not in the loop function. This tutorial was originally posted on the 10kohms.

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How to Connect a 24LC256 EEPROM to an Arduino

Even with only being used, 24lc56 address still must be used. The next three bits A2,A1,A0 are the important bits that we can change so lets look at the simple table below to see what address the chip will have depending on what we set these pins to.

The 24LC operates off a clock signal. If you are going to connect more than one 24xx EEPROM to a microcontroller, you will need to vary the addresses of each of the pins.

Before we get into the software part lets hook up the 24LC chip up to our Arduino. We then create a for loop where we write out 5 ‘2’s representing a zip code.

Since they are all grounded, they are all in LOW states.

24lc25 We will ground all the address pins. The reason why 24c256 EEPROM must have a unique address is because there would be no other way for the microcontroller to address a specific one. In this circuit, we will show how to connect a 24LC to an arduino and how to program the arduino so that it can write to and read from the 24LC chip. Below is the entire tutorial code, scan over it and see if you understand it before I dive into what each section does.

In most other kinds of non-volatile memory, this can’t be done. This is how most consumer electronic devices work. Check out our videos Follow us on: Next we start off just like we did with the write function by starting the process with beginTransmission and then we send the address we want to access; this works exactly the same way as the write function.


We need to send the MSB Most significant bits first so we have to shift our address to the right eight bits. The SCL pin, pin 6, is the serial clock line. Since the address pins, in our case, isthe final address remains 0x Using the image above as a guide lets begin to wire the chip. The address input pins, A0, A1, and A2, are for multiple device operation. Next we do a bitwise AND to get just the last eight bits.

244lc256 more information please read http: To illustrate this lets follow the steps below.

24LC256 Serial I2C EEPROM 256K

This establishes a clock line so that the 24l256 and slave device can work in synchrony. The breadboard circuit of the circuit above is shown below. 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 24c256. This is a little confusing at first so lets look at the figure below to explain the address in a little more detail.

If it wasit would be 0x We then create a serial monitor so that we can see our Serial.