BU9889GUL-WE2 Integrated Circuits (ICs)

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BU9889GUL-WE2 is a multi-function DataFlash memory controller with an I2C-bus interface. It is an integrated, highly reliable system for controlling DataFlash memories that fit the AT45 family. The main features of the BU9889GUL-WE2 are: high speed I2C bus for reading datasheet registers and setting up standard operating parameters in the DataFlash memory; robust auto-address detection and DataFlash protection from read/write errors; high speed random access capability; and low power consumption.

Application Field:

The BU9889GUL-WE2 is suitable for a wide variety of applications that require reliable, fault-tolerant storage. It is a memory controller optimized for DataFlash memories (including AT45 type devices) and can serve as the data storage element in a wide range of devices, including handheld electronic equipment and embedded systems such as telephone dialers, digital cameras, and smart cards.

Working Principle:

The BU9889GUL-WE2 supports both Random and Page Access Read/Write operations. A Random Read/Write operation requires only one I2C clock pulse to access the internal DataFlash memory. This allows faster access times, which increases the system\'s performance. Page Access Read/Write operations require more I2C clock pulses and therefore provide slower access times, however they are more suitable for large data transfers. The BU9889GUL-WE2 also uses I2C bus for communication and configuration, meaning no external components are required for the memory controller.

In order to guarantee the highest reliability and long-term reliability of the system, the BU9889GUL-WE2 uses hardware level Datasheet Error Correction (DEC). DEC uses parity bits or a Hamming code to correct and detect up to one bit error per doubleword (16 bits). Bit errors occurring in the data line or in transactions between the memory and the memory controller can be corrected using DEC. This turns single bit errors that would normally cause incorrect data to be read or written into harmless protocol errors without any damage to the memory or the system.

In addition the BU9889GUL-WE2 provides a feature called Write Verify Mode. This mode requires an additional I2C write after the data has been written to the DataFlash. The controller then reads the DataFlash and compares it with the data that was written. If the comparison fails, the controller stores the error status in the last address and generates an error flag that can be used for further flow control. This ensures that data written to the DataFlash is always decodable and therefore reliable.

The BU9889GUL-WE2 also has a number of different protection mechanisms to ensure that data stored in the DataFlash is secure and reliable. First, during normal operation, the DataFlash is placed in write-protected mode. This prevents accidental modifications or erasure of stored data. In addition, the DataFlash can be protected using a security key, which prevents unauthorized access to the DataFlash.

Finally, in order to ensure low power consumption, the BU9889GUL-WE2 can be configured to have a Standby mode. In this mode, the memory controller is disabled, resulting in lower power consumption. This feature is especially useful in portable devices, where power consumption is a critical requirement.

In conclusion, the BU9889GUL-WE2 is an excellent choice for reliable, high performance memory controllers, providing excellent DataFlash protection and low power consumption. It is suitable for a wide range of applications, including embedded systems, handheld electronic equipment and smart cards.

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