EEPROM 7 Click is a compact add-on board that contains the highest-density memory solution. This board feature the 25CSM04, a 4-Mbit SPI Serial EEPROM with a 128-bit serial number and enhanced write protection mode from Microchip. Internally organized as 2,048 pages of 256 bytes each, the 25CSM04 comes up with the compatible SPI serial interface. It includes a security register with a 128-bit unique serial number and a 256-byte (2048-bit) user-programmable lockable ID page, built-in ECC, and a configurable write protection scheme for all bytes. This Click board™ is suitable for use in consumer and industrial applications where reliable and dependable nonvolatile memory storage is essential.

EEPROM 7 Click is supported by a mikroSDK compliant library, which includes functions that simplify software development.

EEPROM 7 Click is based on the 25CSM04, a 4 Mb Serial EEPROM with a Serial Peripheral Interface (SPI), a 128-bit serial number, and enhanced Write Protection Mode from Microchip. The 25CSM04 is organized as 524,288 bytes of 8 bits each (512 Kbyte) and features a nonvolatile Security register independent of the 4 Mb main memory array. The first half of the Security register is read-only and contains a factory-programmed, globally unique 128-bit serial number in the first 16 bytes. It also includes a Software Device Reset function that allows the user to reset the device to its power-on default behavior without the need to power cycle the device.

Some other advantages of this Click board™ include a lower standby current, the ability to perform single-byte, multi-byte, and full-page writes, shorter erase/rewrite times, and more erase/rewrite cycles. Besides, it includes a user-programmable lockable ID page, built-in ECC, and a configurable write protection scheme for all bytes.

EEPROM 7 Click communicates with MCU using the SPI serial interface that supports the two most common modes, SPI Mode 0 and 3, with a maximum SPI frequency of 8 MHz. In addition to the SPI communication, the EEPROM 7 Click also has two additional pins used for Write Protection and HOLD function routed to the RST and PWM pins of the mikroBUS™ socket.

When a serial communication sequence is underway, a HOLD pin, labeled as HLD, can be used to pause the serial communication with the device without having to stop or reset the clock sequence. The Hold Mode, however, does not affect the internal write cycle. Therefore, if a write cycle is in progress, asserting the HLD pin will not pause the sequence, and the write cycle will continue until its completion.

On the other side, the configurable Write Protection function labeled as WP allows the user to select Legacy Write Protection Mode or Enhanced Write Protection Mode. This pin serves to protect the STATUS register and memory array contents via the Block Protection Modes when Legacy Write Protection mode is enabled. When Enhanced Write Protection mode is enabled, a WP pin protects any memory zone according to how its corresponding Memory Partition registers are programmed.

This Click board™ is designed to operate with both 3.3V and 5V logic voltage levels selected via the VCC SEL jumper. It allows for both 3.3V and 5V capable MCUs to use the SPI communication lines properly. However, the Click board™ comes equipped with a library that contains easy to use functions and an example code which can be used, as a reference, for further development.

• Interface: SPI
• Compatibility: mikroBUS™
• Dimensions: 28.6 x 25.4mm
• Input Voltage: 3.3V or 5V
• Supply Voltage: Min. 2.5V, Max. 5.5V
• Memory Size: 4 Mbit
• EEPROM Write Endurance: 1.000.000 Write Cycles
• EEPROM Data Retention: 100 Years
• Operating Temperature Range: Min. -40°C, Max. +85°C

• Schematic
• 25CSM04 Datasheet
• mikroSDK
• GitHub