25AA040AT-I/SN

Memory: 25AA040AT-I/SN Application Field and Working Principle

The 25AA040AT-I/SN is a 4Kb serial EEPROM device with an SPI-compatible interface. It is produced by Microchip Technology, one of the largest semiconductor company in the world. This EEPROM part is used in many products and applications for storing data and code.

The 25AA040AT-I/SN is a small, low-cost memory device with a simple, single-wire two-way communication interface. The device is made up of 4 blocks of 1Kb of non-volatile memory each. The device has an 8-pin Dip package, with 4 pins programmable as inputs or outputs. The EEPROM can be accessed by the microcontroller using an SPI communications protocol.

The device performs READ, WRITE and INIT commands on the EEPROM. In READ, the selected 8-bit data enters the device on to the SCK pin and is read out directly from the MISO pin, where the data is 1 byte in length. The EEPROM is programmed during the WRITE command, which writes the data at the selected address of the EEPROM. When the processor writes data, the data is written in 8 bits, and the address is provided as 4 bits, providing a total of 12 bits of data.

The EEPROM has an INIT command which is used to initialize the EEPROM. During initialization, the EEPROM’s contents are cleared and the address counter is reset. After the INIT command has been executed, the EEPROM can be read or written before the next INIT command is invoked.

The 25AA040AT-I/SN is used in several applications. It is commonly used for code and data storage in microcontroller-based embedded systems. It can be used to store small programs, settings, or configuration details. It is also used in set-top boxes for storing persistent settings that need to be loaded after system power cycles. It can also be used in consumer electronics, automotive applications, and industrial automation systems. It is also used in consumer healthcare products such as heart rate monitors and blood glucose meters.

In summary, the 25AA040AT-I/SN EEPROM is a low-cost memory device with an SPI-compatible interface. It is used in various applications, such as code and data storage, set-top boxes, consumer electronics, and automotive applications. It is widely used due to its small size and simple communication interface.