SWI EEPROM Click is a compact add-on board that provides a highly reliable memory solution. This board features the AT21CS01, a single-wire serial EEPROM with a unique, factory-programmed 64-bit serial number from Microchip Technology. The AT21CS01 has an ultra-high write endurance capability allowing more than one million cycles for each memory location to meet the requirements for today's high-write endurance applications. It is internally as 128 words of 8 bits each with achieved communication through a single I/O pin with Standard-Speed and High-Speed mode options. Also, it offers a security register with a factory-programmed serial number, which makes it the easiest way to add identification to various accessories and consumables. This Click board™ is suitable for applications where identification or memory storage is required.

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

SWI EEPROM Click, as its foundation, uses the AT21CS01, 2-pin serial electrically erasable and programmable read-only memory (EEPROM) that harvests energy from the SI/O pin to power the integrated circuit from Microchip Technology. It provides 1,024 bits organized as 128 words of 8 bits each, a security register with a 64-bit factory programmed serial number, and an extra 16-bytes of user-programmable and permanently lockable storage. It delivers a guaranteed unique serial number for inventory tracking, asset tagging and can always protect the data if needed.

The AT21CS01 benefit from 100 years of data retention, combining their unprecedented data storage with excellent energy efficiency. It is characterized by high reliability and ultra-high writing endurance capability, allowing more than one million cycles for each memory location to meet today's high-write endurance applications' requirements.

SWI EEPROM Click communicates with MCU using the Single-Wire interface that, by definition, requires only one data line (and ground) for communication with MCU. The SI/O pin routed to the PWM pin of the mikroBUS™ socket is a bidirectional input/output pin used to serially transfer data to and from the device featuring a maximum 15.4Kbps bit rate in Standard-Speed mode and 125Kbps in High-Speed mode.

The AT21CS01 uses a modified I2C interface to extract power from the reading and writing sequences. The software sequence sent to the device is an emulation of what would be sent to an I2C serial EEPROM, except that a 4-bit opcode replaces a typical 4-bit device type identifier of 1010b in the device address. The device has been architected to allow for rapid deployment and significant reuse of existing I2C firmware.

This Click board™ can be operated only with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before use with 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.

• Interface: SWI
• Compatibility: mikroBUS™
• Dimensions: 28.6 x 25.4mm
• Input Voltage: 3.3V
• Memory Size: 1Kbit
• Write Endurance: 1.000.00 Write Cycles
• Data Retention: 100 Years
• Operating Temperature Range: Min. -40°C, Typ. +25°C, Max. +85°C

• Schematic
• AT21CS01 Datasheet
• mikroSDK
• GitHub