Beginner
10 min

Ensure reliable non-volatile data storage with N34C04MU3ETG and ATmega328P

Non-volatile data storage with 1 million write cycles and 100 years of data retention

EEPROM 15 Click with Arduino UNO Rev3

Published Apr 10, 2025

Click board™

EEPROM 15 Click

Dev. board

Arduino UNO Rev3

Compiler

NECTO Studio

MCU

ATmega328P

Ensure reliable, long-term EEPROM storage with JEDEC-compliant performance and low power consumption

A

A

Hardware Overview

How does it work?

EEPROM 15 Click is based on the N34C04MU3ETG, a 4Kb serial EEPROM from onsemi, designed for reliable and efficient data storage in computing systems. It is specifically designed to meet the JEDEC JC42.4 (EE1004−v) Serial Presence Detect (SPD) specification for DDR4 DIMMs. This EEPROM supports multiple I2C communication modes, including Standard mode at 100kHz, Fast mode at 400kHz, and Fast Plus mode at up to 1MHz, making it versatile for various speed requirements in embedded applications. The N34C04MU3ETG version integrated on this board includes a unique response behavior where it issues a NoACK signal after receiving a dummy data byte, ensuring compatibility with SPD protocols. Additionally, it features a 16-byte page write buffer that enhances writing efficiency and minimizes the time needed for data programming. Based on a low-power CMOS technology, it offers an impressive endurance of up to one million write

cycles and guarantees data retention for a minimum of 100 years, making it highly reliable for long-term applications, like use in computing environments that demand robust non-volatile memory with excellent performance and durability. This Click board™ is designed in a unique format supporting the newly introduced MIKROE feature called "Click Snap." Unlike the standardized version of Click boards, this feature allows the main IC area to become movable by breaking the PCB, opening up many new possibilities for implementation. Thanks to the Snap feature, the N34C04MU3ETG can operate autonomously by accessing its signals directly on the pins marked 1-8. Additionally, the Snap part includes a specified and fixed screw hole position, enabling users to secure the Snap board in their desired location. As mentioned, this Click board™ uses an I2C interface with clock speeds of up to 1MHz, ensuring fast communication with the host MCU. The I2C

address of the N34C04MU3ETG can be easily configured via onboard jumpers marked ADDR SEL in the Snap area, allowing multiple devices to coexist on the same bus. In addition to the I2C interface pins, EEPROM 15 Click features an WP pin used to inhibits all write operations, when pulled HIGH. One of the two available 2Kb EEPROM banks (referred to as SPD pages in the EE1004−v specification) is activated for access at power−up. After power−up, banks can be switched via software command. Each of the four 1Kb EEPROM blocks can be Write Protected by software command. This Click board™ can be operated only with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. It also comes equipped with a library containing functions and example code that can be used as a reference for further development.

EEPROM 15 Click hardware overview image

Features overview

Development board

Arduino UNO is a versatile microcontroller board built around the ATmega328P chip. It offers extensive connectivity options for various projects, featuring 14 digital input/output pins, six of which are PWM-capable, along with six analog inputs. Its core components include a 16MHz ceramic resonator, a USB connection, a power jack, an

ICSP header, and a reset button, providing everything necessary to power and program the board. The Uno is ready to go, whether connected to a computer via USB or powered by an AC-to-DC adapter or battery. As the first USB Arduino board, it serves as the benchmark for the Arduino platform, with "Uno" symbolizing its status as the

first in a series. This name choice, meaning "one" in Italian, commemorates the launch of Arduino Software (IDE) 1.0. Initially introduced alongside version 1.0 of the Arduino Software (IDE), the Uno has since become the foundational model for subsequent Arduino releases, embodying the platform's evolution.

Arduino UNO Rev3 double side image

Microcontroller Overview

MCU Card / MCU

default

Architecture

AVR

MCU Memory (KB)

32

Silicon Vendor

Microchip

Pin count

28

RAM (Bytes)

2048

You complete me!

Accessories

Click Shield for Arduino UNO has two proprietary mikroBUS™ sockets, allowing all the Click board™ devices to be interfaced with the Arduino UNO board without effort. The Arduino Uno, a microcontroller board based on the ATmega328P, provides an affordable and flexible way for users to try out new concepts and build prototypes with the ATmega328P microcontroller from various combinations of performance, power consumption, and features. The Arduino Uno has 14 digital input/output pins (of which six can be used as PWM outputs), six analog inputs, a 16 MHz ceramic resonator (CSTCE16M0V53-R0), a USB connection, a power jack, an ICSP header, and reset button. Most of the ATmega328P microcontroller pins are brought to the IO pins on the left and right edge of the board, which are then connected to two existing mikroBUS™ sockets. This Click Shield also has several switches that perform functions such as selecting the logic levels of analog signals on mikroBUS™ sockets and selecting logic voltage levels of the mikroBUS™ sockets themselves. Besides, the user is offered the possibility of using any Click board™ with the help of existing bidirectional level-shifting voltage translators, regardless of whether the Click board™ operates at a 3.3V or 5V logic voltage level. Once you connect the Arduino UNO board with our Click Shield for Arduino UNO, you can access hundreds of Click boards™, working with 3.3V or 5V logic voltage levels.

Click Shield for Arduino UNO accessories 1 image

Used MCU Pins

mikroBUS™ mapper

NC
NC
AN
NC
NC
RST
ID COMM
PB2
CS
NC
NC
SCK
NC
NC
MISO
NC
NC
MOSI
Power Supply
3.3V
3.3V
Ground
GND
GND
Write Protect
PD6
PWM
NC
NC
INT
NC
NC
TX
NC
NC
RX
I2C Clock
PC5
SCL
I2C Data
PC4
SDA
NC
NC
5V
Ground
GND
GND
1

Take a closer look

Click board™ Schematic

EEPROM 15 Click Schematic schematic

Step by step

Project assembly

Click Shield for Arduino UNO front image hardware assembly

Start by selecting your development board and Click board™. Begin with the Arduino UNO Rev3 as your development board.

Click Shield for Arduino UNO front image hardware assembly
Arduino UNO Rev3 front image hardware assembly
Charger 27 Click front image hardware assembly
Prog-cut hardware assembly
Charger 27 Click complete accessories setup image hardware assembly
Board mapper by product8 hardware assembly
Necto image step 2 hardware assembly
Necto image step 3 hardware assembly
Necto image step 4 hardware assembly
Necto image step 5 hardware assembly
Necto image step 6 hardware assembly
Arduino UNO MCU Step hardware assembly
Necto No Display image step 8 hardware assembly
Necto image step 9 hardware assembly
Necto image step 10 hardware assembly
Debug Image Necto Step hardware assembly

Track your results in real time

Application Output

1. Application Output - In Debug mode, the 'Application Output' window enables real-time data monitoring, offering direct insight into execution results. Ensure proper data display by configuring the environment correctly using the provided tutorial.

2. UART Terminal - Use the UART Terminal to monitor data transmission via a USB to UART converter, allowing direct communication between the Click board™ and your development system. Configure the baud rate and other serial settings according to your project's requirements to ensure proper functionality. For step-by-step setup instructions, refer to the provided tutorial.

3. Plot Output - The Plot feature offers a powerful way to visualize real-time sensor data, enabling trend analysis, debugging, and comparison of multiple data points. To set it up correctly, follow the provided tutorial, which includes a step-by-step example of using the Plot feature to display Click board™ readings. To use the Plot feature in your code, use the function: plot(*insert_graph_name*, variable_name);. This is a general format, and it is up to the user to replace 'insert_graph_name' with the actual graph name and 'variable_name' with the parameter to be displayed.

Software Support

Library Description

EEPROM 15 Click demo application is developed using the NECTO Studio, ensuring compatibility with mikroSDK's open-source libraries and tools. Designed for plug-and-play implementation and testing, the demo is fully compatible with all development, starter, and mikromedia boards featuring a mikroBUS™ socket.

Example Description
This example demonstrates the use of EEPROM 15 Click board by writing specified data to the memory and reading it back.

Key functions:

  • eeprom15_cfg_setup - This function initializes Click configuration structure to initial values.

  • eeprom15_init - This function initializes all necessary pins and peripherals used for this Click board.

  • eeprom15_select_bank - This function selects the active memory bank in the EEPROM.

  • eeprom15_write_memory - This function writes data to the EEPROM memory starting from the specified address.

  • eeprom15_read_memory - This function reads data from the EEPROM memory starting from the specified address.

Application Init
Initializes the driver and logger.

Application Task
Writes a desired number of bytes to the memory and then verifies if it is written correctly by reading from the same memory location and displaying the memory content on the USB UART.

Open Source

Code example

The complete application code and a ready-to-use project are available through the NECTO Studio Package Manager for direct installation in the NECTO Studio. The application code can also be found on the MIKROE GitHub account.

/*!
 * @file main.c
 * @brief EEPROM 15 Click example
 *
 * # Description
 * This example demonstrates the use of EEPROM 15 Click board by writing specified data to
 * the memory and reading it back.
 *
 * The demo application is composed of two sections :
 *
 * ## Application Init
 * Initializes the driver and logger.
 *
 * ## Application Task
 * Writes a desired number of bytes to the memory and then verifies if it is written correctly
 * by reading from the same memory location and displaying the memory content on the USB UART.
 *
 * @author Stefan Filipovic
 *
 */

#include "board.h"
#include "log.h"
#include "eeprom15.h"

#define DEMO_TEXT_MESSAGE_1     "MIKROE"
#define DEMO_TEXT_MESSAGE_2     "EEPROM 15 Click"
#define STARTING_ADDRESS        0x10

static eeprom15_t eeprom15;
static log_t logger;

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    eeprom15_cfg_t eeprom15_cfg;  /**< Click config object. */

    /** 
     * Logger initialization.
     * Default baud rate: 115200
     * Default log level: LOG_LEVEL_DEBUG
     * @note If USB_UART_RX and USB_UART_TX 
     * are defined as HAL_PIN_NC, you will 
     * need to define them manually for log to work. 
     * See @b LOG_MAP_USB_UART macro definition for detailed explanation.
     */
    LOG_MAP_USB_UART( log_cfg );
    log_init( &logger, &log_cfg );
    log_info( &logger, " Application Init " );

    // Click initialization.
    eeprom15_cfg_setup( &eeprom15_cfg );
    EEPROM15_MAP_MIKROBUS( eeprom15_cfg, MIKROBUS_1 );
    if ( I2C_MASTER_ERROR == eeprom15_init( &eeprom15, &eeprom15_cfg ) )
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }

    log_info( &logger, " Application Task " );
}

void application_task ( void )
{
    static uint8_t bank_sel = EEPROM15_BANK_SEL_0; 
    uint8_t data_buf[ EEPROM15_MEM_PAGE_SIZE + 1 ] = { 0 };

    // Selecting memory bank
    if ( EEPROM15_ERROR == eeprom15_select_bank ( &eeprom15, bank_sel ) )
    {
        log_error( &logger, " No communication with EEPROM." );
        for ( ; ; );
    }
    log_printf ( &logger, "\r\n Memory bank: %u\r\n", ( uint16_t ) bank_sel );
    log_printf ( &logger, " Memory address: 0x%.2X\r\n", ( uint16_t ) STARTING_ADDRESS );
    bank_sel ^= EEPROM15_BANK_SEL_1;

    // Write/Read first iterration
    if ( strlen ( DEMO_TEXT_MESSAGE_1 ) > EEPROM15_MEM_PAGE_SIZE )
    {
        memcpy ( data_buf, DEMO_TEXT_MESSAGE_1, EEPROM15_MEM_PAGE_SIZE );
    }
    else
    {
        memcpy ( data_buf, DEMO_TEXT_MESSAGE_1, strlen ( DEMO_TEXT_MESSAGE_1 ) );
    }
    if ( EEPROM15_OK == eeprom15_write_memory ( &eeprom15, STARTING_ADDRESS, data_buf, EEPROM15_MEM_PAGE_SIZE ) )
    {
        log_printf ( &logger, " Write data: %s\r\n", data_buf );
    }
    Delay_ms ( 100 );
    memset ( data_buf, 0, sizeof ( data_buf ) );
    if ( EEPROM15_OK == eeprom15_read_memory ( &eeprom15, STARTING_ADDRESS, data_buf, EEPROM15_MEM_PAGE_SIZE ) )
    {
        log_printf ( &logger, " Read data: %s\r\n", data_buf );
    }
    Delay_ms ( 100 );
    
    // Write/Read second iterration
    if ( strlen ( DEMO_TEXT_MESSAGE_2 ) > EEPROM15_MEM_PAGE_SIZE )
    {
        memcpy ( data_buf, DEMO_TEXT_MESSAGE_2, EEPROM15_MEM_PAGE_SIZE );
    }
    else
    {
        memcpy ( data_buf, DEMO_TEXT_MESSAGE_2, strlen ( DEMO_TEXT_MESSAGE_2 ) );
    }
    if ( EEPROM15_OK == eeprom15_write_memory ( &eeprom15, STARTING_ADDRESS, data_buf, EEPROM15_MEM_PAGE_SIZE ) )
    {
        log_printf ( &logger, " Write data: %s\r\n", data_buf );
    }
    Delay_ms ( 100 );
    memset ( data_buf, 0, sizeof ( data_buf ) );
    if ( EEPROM15_OK == eeprom15_read_memory ( &eeprom15, STARTING_ADDRESS, data_buf, EEPROM15_MEM_PAGE_SIZE ) )
    {
        log_printf ( &logger, " Read data: %s\r\n", data_buf );
    }

    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
}

int main ( void ) 
{
    /* Do not remove this line or clock might not be set correctly. */
    #ifdef PREINIT_SUPPORTED
    preinit();
    #endif
    
    application_init( );
    
    for ( ; ; ) 
    {
        application_task( );
    }

    return 0;
}

// ------------------------------------------------------------------------ END

Additional Support

Resources

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