FM25V01 datasheet(4/15 Pages) RAMTRON

4 / 15 page

FM25V01 - 128Kb SPI FRAM

Rev. 1.1

Sept. 2011

Page 4 of 15

System Hookup

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 FM25V01 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 FM25V01 device.

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.

SPI

Microcontroller

FM25V01

HOLD

FM25V01

HOLD

SCK

MOSI

MISO

SS1

SS2

HOLD1

HOLD2

MOSI : Master Out Slave In

MISO : Master In Slave Out

SS : Slave Select

Figure 3. 256Kbit (32KB) System Configuration with SPI port

Microcontroller

FM25V01

HOLD

P1.0

P1.1

P1.2

Vdd

Figure 4. System Configuration without SPI port

FM25V01 Datasheet(PDF) 4 Page - Ramtron International Corporation

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