FM24V02_10 RAMTRON [Ramtron International Corporation], FM24V02_10 Datasheet - Page 9

• Manufacturer Part Number: FM24V02_10
• Description: 256Kb Serial 3V F-RAM Memory
• Manufacturer: RAMTRON [Ramtron International Corporation]

Device ID
The FM24V02 and FM24VN02 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:
Rev. 2.0
May 2010
By FM24V02
By Master
1.
2.
3.
4.
Start
The master sends a START command.
The master sends Reserved Slave ID 0xF8
The master sends the I
of the slave device it needs to identify. The
last bit is a ‘Don’t care’ value (R/W bit).
Only one device must acknowledge this byte
(the one that has the I
The master sends a Re-START command.
S
11
0
Rsvd Slave ID (F8)
10
0
0
The 3-byte hex code for an FM24V02 will be:
The 3-byte hex code for an FM24VN02 will be:
9
Density: 01h=128Kb, 02h=256Kb, 03h=512Kb, 04=1Mb
Variation: Product ID bit 4 = S/N, Product ID bit 0 = reserved
0
Manufacturer ID
8
Address
A
0
7
Ramtron
2
Slave Address
C-bus slave address).
0
6
2
C-bus slave address
0
5
Figure 14. Manufacturer and Product ID
0
4
Acknowledge
0
3
A
Figure 13. Read Device ID
Start
S
1
2
Rsvd Slave ID (F9)
0
1
Address
0
0
0
8
Density
Note: The reading of the Device ID can be stopped
anytime by sending a NACK command.
A
7
0
5.
6.
7.
6
1
Data Byte
Product ID
5
0
The master sends Reserved Slave ID 0xF9
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.
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.
N
4
Variation
0x00 0x42 0x00
0x00 0x42 0x80
0
3
A
0
2
FM24V02 - 256Kb I2C FRAM
Acknowledge
Data Byte
0
1
Data
0
0
0
2
Die Rev.
A
0
1
Data Byte
0
0
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Acknowledge
No
1
P
Stop