FM24V10 datasheet(9/15 Pages) RAMTRON

9 / 15 page

FM24V10 - 1Mb I2C FRAM

Rev. 1.1

Feb. 2009

Page 9 of 15

Device ID

The FM24V10 and FM24VN10 devices incorporate a

means of identifying the device by providing three

bytes of data, which are manufacturer, product ID,

and die revision. The Device ID is read-only. It can

be accessed as follows:

1. The master sends a START command.

2. The master sends Reserved Slave ID 0xF8

3. The master sends the I2C-bus slave address

of the slave device it needs to identify. The

last two bits are ‘Don’t care’ values (Page

Select and R/W bits). Only one device must

acknowledge this byte (the one that has the

I2C-bus slave address).

4. The master sends a Re-START command.

5. The master sends Reserved Slave ID 0xF9

6. The Device ID Read can be done, starting

with the 12 manufacturer bits, followed by

the 9 part identification bits, and then the 3

die revision bits.

7. The master ends the Device ID read

sequence by NACKing the last byte, thus

resetting the slave device state machine and

allowing the master to send the STOP

command.

Note: The reading of the Device ID can be stopped

anytime by sending a NACK command.

Data Byte

By Master

By FM24V10

Start

Address

Stop

Acknowledge

Data

Rsvd Slave ID (F8)

Slave Address

Start

Address

Acknowledge

Rsvd Slave ID (F9)

Data Byte

Acknowledge

X X

Figure 13. Read Device ID

Manufacturer ID

Product ID

Die Rev.

Ramtron

Density

Variation

Figure 14. Manufacturer and Product ID

Density: 02h=256Kb, 03h=512Kb, 04=1Mb

Variation: Product ID bit 4 = S/N, Product ID bits 3-1 = VTP option, Product ID bit 0 = reserved

The 3-byte hex code for an FM24V10 will be:

0x00 0x44 0x00

The 3-byte hex code for an FM24VN10 will be:

0x00 0x44 0x80

The 3-byte hex code for an FM24VR10-G1 will be:

0x00 0x44 0x10

The 3-byte hex code for an FM24VR10-G2 will be:

0x00 0x44 0x20

The 3-byte hex code for an FM24VRN10-G1 will be:

0x00 0x44 0x90

The 3-byte hex code for an FM24VRN10-G2 will be:

0x00 0x44 0xA0

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