FM25V02 - 256Kb SPI FRAM
System Hookup
For a microcontroller that has no dedicated SPI bus, a
general purpose port may be used. To reduce
hardware resources on the controller, it is possible to
connect the two data pins together and tie off the
Hold pin. Figure 4 shows a configuration that uses
only three pins.
The SPI interface uses a total of four pins: clock,
data-in, data-out, and chip select. A typical system
configuration uses one or more FM25V02 devices
with a microcontroller that has a dedicated SPI port,
as Figure 3 illustrates. Note that the clock, data-in,
and data-out pins are common among all devices.
The Chip Select and Hold pins must be driven
separately for each FM25V02 device.
Figure 3. 512Kbit (64KB) System Configuration with SPI port
Figure 4. System Configuration without SPI port
Rev. 2.0
May 2010
Page 4 of 17
RAMTRON [ RAMTRON INTERNATIONAL CORPORATION ]
