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Memory

25AA02E64T-I/SN is a SPI EEPROM produced and developed by Microchip Technology Inc. It is a non-volatile memory device that allows data to be stored reliably even when the power is turned off. It is an ideal solution for embedded system applications. The 25AA02E64T-I/SN has a typical operating voltage of 1.8 to 5.5V and is available in a wide variety of packages, such as SOIC, DIP, TSSOP, and MSOP8. The maximum clock frequency for the 25AA02E64T-I/SN is 40MHz.

Application Field

The 25AA02E64T-I/SN is a highly flexible memory device that can be used in a variety of applications. The device is ideal for portable medical devices, data storage and communication, automotive applications, smart meter technology, retail, industrial, and even the Internet of Things (IoT). In addition, the device is suitable for long-term data storage and fast read-write (e.g. real-time control applications).

Working Principle

The 25AA02E64T-I/SN utilizes a double-byte architecture, allowing two bytes of data to be stored side-by-side on the memory chip. The device employs a Serial Peripheral Interface (SPI) protocol, which is a full-duplex, synchronous serial communication protocol. The SPI allows 8-bit data transfers over four signal lines, namely, Serial Clock (SCK), Serial Out (SO), Serial In (SI), and Chip Select (CS). Once the device has its power source connected, the SPI protocol can be initiated. The SPI communication follows the Master-Slave configuration. The Master module, in this case, being a microcontroller, sends out the necessary commands and clock signals to the Slave module, in this case, the 25AA02E64T-I/SN. The Slave device responds to the commands in the defined SPI frame format.

The write operation on the 25AA02E64T-I/SN is preceded by sending out 3-byte instruction to select the start address. Once the device is at the correct starting address, the Master sends out the 8-bit instruction of the write command. The data is then written consecutively in a multiple of 8-bit. Upon completion of the write cycle a status register is updated and the device then returns the Byte Acknowledge (ACK) signal. Similarly, for a read operation, the master sends a 3-byte instruction for setting the initial address. The 8-bit instruction of the read command is then sent and the device responds by sending out the data byte-by-byte over the SO line. The byte acknowledge signal is then sent to the master.

The 25AA02E64T-I/SN device provides a wealth of features, such as write protect, hardware write protect, power save (Deep power-down), high speed write capability (up to 8 bytes in 8us), page write capability (up to 64 bytes in 8ms), and the ability to read and write data with software and hardware protection.

In conclusion, the 25AA02E64T-I/SN is an ideal solution for any embedded system application that requires non-volatile memory storage. It offers superior performance as well as a wide range of features and benefits that make it a great choice for any project.

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