Description:
To integrate a 24C256 EEPROM, you will use the two-wire I2C communication protocol to connect the chip to a microcontroller, such as an Arduino or an STM32. The process involves wiring the chip correctly, adding pull-up resistors to the I2C lines, and using the microcontroller’s I2C library to send read and write commands.
To integrate a 24C256 EEPROM, you will use the two-wire I2C communication protocol to connect the chip to a microcontroller, such as an Arduino or an STM32. The process involves wiring the chip correctly, adding pull-up resistors to the I2C lines, and using the microcontroller’s I2C library to send read and write commands.
1. Hardware integration and wiring
Pinout and function:
The 24C256 is an 8-pin serial EEPROM. The pinout for a common AT24C256 or similar chip is as follows:
- VCC: Power supply input (1.8V to 5.5V).
- GND: Ground connection.
- SDA (Serial Data): Bidirectional data line for I2C communication.
- SCL (Serial Clock): Clock signal for I2C communication, generated by the master device (microcontroller).
- WP (Write Protect): Hardware protection pin.
- Low (GND): Allows normal read and write operations.
- High (VCC): Inhibits all write operations to the memory.
- A0, A1, A2 (Address Inputs): Used to set the device’s I2C address.
- By tying these pins to VCC or GND, you can connect multiple EEPROMs to the same I2C bus. For a single chip, connect all three pins to GND.
Circuit diagram:
A typical connection to a microcontroller, like an Arduino Uno, would be:
- 24C256 VCC: Connect to the Arduino’s 5V pin.
- 24C256 GND: Connect to the Arduino’s GND pin.
- 24C256 SDA: Connect to the Arduino’s SDA pin (A4 on an Uno).
- 24C256 SCL: Connect to the Arduino’s SCL pin (A5 on an Uno).
- 24C256 WP: Connect to GND to allow writing to the EEPROM.
- 24C256 A0, A1, A2: Connect to GND.
- Pull-up resistors: Add pull-up resistors (typically 4.7kΩ) between the SDA line and VCC, and between the SCL line and VCC. These are essential for I2C communication and are often included on pre-built modules.
24C256 Technical Specifications:
| Manufacturer | Atmel |
| Mounting Type | Soic-8 |
| Memory | 256Kbit |
| Product Category | EEPROM |
| Supply Voltage | From 1.8 to 5.5 V |
| Supply Current | (Max) 1mA |
| Frequency (Max) | 0.4 MHz |
| Nominal Ambient Temperature | -40 ° C ~ + 85 ° C |
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