Mikroelektronika d.o.o.
SKU: MIKROE-4895ReRAM 2 Click Board
ReRAM 2 Click Board
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The ReRAM 2 Click Board™ is a compact add-on board containing highly reliable resistive random-access memory. This board features the MB85AS8MT, an 8Mbit memory organized as 1,048,576 words of 8 bits from Fujitsu Semiconductor. The MB85AS8MT uses the resistance-variable memory process and silicon-gate CMOS process technologies to form nonvolatile memory cells. This SPI configurable ReRAM can withstand many write cycles (1x106 rewrite operations), has a data retention period greater than ten years, and can read and write to random addresses with very negligible delay.
The ReRAM 2 Click Board™ is ideal as a nonvolatile storage media or temporary RAM expansion for storing variables in any embedded application that requires rapid writes and unlimited endurance.
How Does The ReRAM 2 Click Board™ Work?
The ReRAM 2 Click Board™ as its foundation uses the MB85AS8MT, a highly reliable 8Mbit resistive random-access memory (ReRAM) organized as 1,048,576 words of 8 bits from Fujitsu Semiconductor. It uses the resistance-variable memory process and silicon-gate CMOS process technologies to form nonvolatile memory cells. The MB85AS8MT specifies 1.000.000 endurance cycles with data retention of a minimum of 10 years, which gives the MB85AS8MT the capability to handle unlimited reads/writes to the memory.
One prominent feature of the MB85AS8MT is an extremely small average current, despite its large density, for reading operations of 0.15mA at an operating frequency of 5MHz, which is only 5% of large density EEPROM devices. This feature enables minimal power consumption when in applications with frequent data-read operations. Besides higher write endurance, it has faster write speeds than EEPROM and flash memory, while its electric specifications, such as commands and timings, are compatible with EEPROM products.
The ReRAM 2 Click Board™ communicates with MCU through a standard SPI interface that enables high clock speeds up to 10MHz, supporting the two most common SPI modes, SPI Mode 0 and 3. An additional feature of this Click board™ represents the configurable Write Protection function labeled as WP routed on the PWM pin of the mikroBUS™ socket. The WP pin protects the entire memory and all registers from write operations and must be set to a low logic state to inhibit all the write operations. All memory and register writes are prohibited when this pin is low, and the address counter is not incremented. Besides, the ReRAM 2 Click Board™ also has an additional HOLD pin, routed to the RST pin of the mikroBUS™ socket labeled as HO, to interrupt a serial operation without aborting it.
The ReRAM 2 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. However, the Click board™ comes equipped with a library containing functions and an example code that can be used, as a reference, for further development.
SPECIFICATIONS
| Type | ReRAM |
| Applications | Can be used as a nonvolatile storage media or temporary RAM expansion for storing variables in any embedded application that requires rapid writes and unlimited endurance |
| On-board modules | MB85AS8MT - highly reliable resistive random-access memory (ReRAM) from Fujitsu Semiconductor |
| Key Features | 8 Mbits (1,048,576 words x 8 bits), 256 bytes buffer size, high endurance and data retention, fast serial interface, sophisticated write protection scheme, and more |
| Interface | SPI |
| Compatibility | mikroBUS |
| Click board size | S (28.6 x 25.4 mm) |
| Input Voltage | 3.3V |
PINOUT DIAGRAM
This table shows how the pinout of the ReRAM 2 Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).
| Notes | Pin |  |
Pin | Notes | |||
|---|---|---|---|---|---|---|---|
| NC | 1 | AN | PWM | 16 | WP | Write Protection | |
| SPI Suspension | HO | 2 | RST | INT | 15 | NC | |
| SPI Chip Select | CS | 3 | CS | RX | 14 | NC | |
| SPI Clock | SCK | 4 | SCK | TX | 13 | NC | |
| SPI Data OUT | SDO | 5 | MISO | SCL | 12 | NC | |
| SPI Data IN | SDI | 6 | MOSI | SDA | 11 | NC | |
| Power Supply | 3.3V | 7 | 3.3V | 5V | 10 | NC | |
| Ground | GND | 8 | GND | GND | 9 | GND | Ground |
ONBOARD SETTINGS AND INDICATORS
| Label | Name | Default | Description |
|---|---|---|---|
| LD1 | PWR | - | Power LED Indicator |
RERAM 2 CLICK ELECTRICAL SPECIFICATIONS
| Description | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | - | 3.3 | - | V |
| Memory Size | - | - | 8 | Mbit |
| Write Endurance | 10 6 | - | - | Write Cycles |
| Data Retention | 10 | - | - | Years |
| Operating Temperature Range | -40 | +25 | +85 | °C |
Software Support
We provide a library for the ReRAM 2 Click Board™ as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.
The package can be downloaded/installed directly from NECTO Studio Package Manager (recommended way), downloaded from our LibStock™ or found on Mikroe github account.
Library Description
This library contains API for the ReRAM 2 Click Board™ driver.
Key functions
-
reram2_read_device_idReRAM 2 read device ID function. -
reram2_write_memoryReRAM 2 write memory function. -
reram2_read_memoryReRAM 2 read memory function.
Example Description
This library contains API for the ReRAM 2 Click Board™ driver.
void application_task ( void )
{
static char rx_data[ 9 ] = { 0 };
reram2_read_memory( &reram2, memory_addr, &rx_data[ 0 ], 9 );
log_printf( &logger, " Read data : %s", rx_data );
log_printf( &logger, "-----------------------rn" );
Delay_ms( 2000 );
}
The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe Github account.
Other Mikroe Libraries used in the example:
- MikroSDK.Board
- MikroSDK.Log
- Click.ReRAM2
Additional Notes and Information
Depending on the development board you are using, you may need a USB UART click, USB UART 2 Click or RS232 Click to connect to your PC, for development systems with no UART to USB interface available on the board. UART terminal is available in all MikroElektronika compilers.
MIKROSDK
The ReRAM 2 Click Board™ is supported with mikroSDK - MikroElektronika Software Development Kit. To ensure proper operation of mikroSDK compliant Click board™ demo applications, mikroSDK should be downloaded from the LibStock and installed for the compiler you are using.
ReRAM 2 Click Board
Frequently Asked Questions
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