AT49BV002-12VC

The AT49BV002-12VC Memory is a non-volatile memory type device provided by Atmel Corporation. It is a memory device used to store data and instructions that needs to be protected and remain unchanged when power is turned off. The AT49BV002-12VC Memory provides densities of up to 512Kbits of 12-volt ICs and provides performance speeds up to 150 nsec (read time). It is offered in 8pin and SOIC packages.

Application Field

The AT49BV002-12VC Memory is ideal for applications that require information to be retained during power loss. It is used in automotive control systems where the vehicle needs to “remember” settings such as power windows, radio settings, seat positions, etc. This is also used in industrial settings, where information needs to be stored, such as data logging in power sources, monitoring of network nodes, or plant process control settings.

Aside from its industrial and automotive applications, the AT49BV002-12VC is also found in communications applications such as cellular, radio, and transmission sites. Personal/mobile communications such as PCMCIA Cards and Cellular Modems may also benefit from the use of this device.

Working Principle

The AT49BV002-12VC Memory uses the ferroelectric RAM (FRAM) technology. This particular device is comprised of 256K by 8 bits of memory, 16K words x 8 bits. It is organized as four 64K by 8-bit buffers, each containing bytes that can be accessed with a single read/write cycle. This makes the memory device very attractive to many applications that requires high-speed operation. The device also contains an internal 32-Kbit EEPROM, allowing users to store information even when the power is turned off.

The device utilizes a three-wire serial interface for data entry and data output. It includes instruction, address and data bits. The instruction instructs the memory device on what operations to do, the address selects one specific memory and the data bits contain the characters that has to be read or written. The device can be operated using two operating modes, the command/addressed mode and the streaming mode.

In the command/addressed mode, users must enter the instruction prior to entering the address. An instruction is followed by the word address and it is subsequently used as a pointer to a particular memory word. Subsequent instructions shall continue to be written in this mode. In the streaming mode, data can be written and read with only the Byte/Word write and read instructions. This mode is useful when programming or reading the memory with consecutive data.

The device uses a bypass register to transfer data between the write and read input pins. When the instruction bits are equal to the "write page to buffer" command, the page data is being sent to the internal buffer and can be rewritten several times before being written to the internal memory array. This is useful when writing large blocks of data.

The internal EEPROM cells are divided into 32 sectors and can be programmed and read byte by byte. The programming and erasing of the EEPROM can be done using the write and erase byte instruction. The device also includes a security feature to protect against unauthorized use. It includes a write Protection bit which can be used to protect all data on the memory.

The AT49BV002-12VC Memory is a powerful and durable memory device that provides a reliable means of data storage, despite the presence of electrical power failures. It provides a fast and efficient way to store and access information, enabling industrial and automotive applications to function without interruption. It also provides an excellent solution for communications applications, giving users the reliability of data storage in the various environments.