25AA320AXT-I/ST

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25AA320AXT-I/ST belongs to the memory category, with which the application field and working principle are discussed below.

Introduction to 25AA320AXT-I/ST

25AA320AXT-I/ST is a Serial EEPROM device that offers 32,768 bits of non-volatile memory, lower current consumption and free programming of * Lock Bits (Lock Configuration Register and Security ID Register). It is designed for applications that require non-volatile data storage, such as handheld instrumentation, medical and security systems, automotive electronics, and many other embedded systems.

Application Field

25AA320AXT-I/ST solves the problem of needing an array of non-volatile memory in microcontroller-based applications. It is used in a wide variety of applications, such as memory card readers, bar-code scanning, temperature sensors, product registration, touch panels, etc.

In a memory card reader application, it provides the functionality to transfer data at high speed without the need of charger holding device on the top of it. For bar code scanners, it records the data when there is no power and helps to feed it directly to the processing unit. In home and commercial security systems, it remembers the access codes of the users and can store the activities for future log and search scope.

Apart from those, 25AA320AXT-I/ST can also be very useful in automotive engines, where the engine control module decides to start the engine and when to change the gears by considering lot of data. In pharmaceutical and medical fields, it can store patient information, medicinal details and a reference history of the same.

Working Principle

The 25AA320AXT-I/ST provides up to 32Kbits of non-volatile memory and contains an on-chip 256-byte non-volatile Status/Configuration Register with user-programmable Lock Bits \'L\' and Security ID Registers. The 25AA320AXT-I/ST features Self-Timed Write Cycle (typ. 3ms) and Page Write operations with up to 32 bytes of data. It operates with a single supply voltage (2.7V to 5.5V) and its data bus is compatible with I2C bus interface.

The 25AA320AXT-I/ST is organized logically as 256 pages (16 bytes per page) and can write one byte or a full page at a time in a time multiplexed Byte Write or Page Write cycle. When a Page Write cycle is executed, after the data has been written, the device issues the acknowledgment, which signifies the completion of the Page Write cycle. The 25AA320AXT-I/ST can also perform a Multi-Byte Page Write operation, which allows the user to write up to 32 bytes of data in a single operation.

The 25AA320AXT-I/ST features two user programmable Lock Bits (Lock Configuration Register and Security ID Register) that can be used to secure the device against unauthorized access. The Lock Bits are programmed to write-protect the devices, and the Lock Bits can only be cleared by sending a special command sequence. With the Lock Bits programmed, all write commands will be ignored and the device remains in the protect mode.

Conclusion

25AA320AXT-I/ST is an ideal choice for microcontroller-based applications and provides a reliable non-volatile memory with lower current consumption. Its wide range of application and simple working principle makes it very popular in many industries. With its high-speed data transfer and secure writing protection, it is an ideal choice for embedded systems that need non-volatile data storage.

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