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FM24VN05-G Datasheet(PDF) 9 Page - Ramtron International Corporation

Part # FM24VN05-G
Description  512Kb Serial 3V F-RAM Memory
Download  15 Pages
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Manufacturer  RAMTRON [Ramtron International Corporation]
Direct Link  http://www.ramtron.com
Logo RAMTRON - Ramtron International Corporation

FM24VN05-G Datasheet(HTML) 9 Page - Ramtron International Corporation

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FM24V05 - 512Kb I2C FRAM
Rev. 1.1
Feb. 2009
Page 9 of 15
Device ID
The FM24V05 and FM24VN05 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 bit is a ‘Don’t care’ value (R/W bit).
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.
S
A
Data Byte
Data Byte
1
P
By Master
By FM24V05
Start
Address
Stop
No
Acknowledge
Data
S
A
Rsvd Slave ID (F8)
Slave Address
A
Start
Address
Acknowledge
Rsvd Slave ID (F9)
A
A
Data Byte
Acknowledge
Figure 13. Read Device ID
Manufacturer ID
Product ID
Die Rev.
11
10
9
8
7
6
5
4
3
2
1
0
8
7
6
5
4
3
2
1
0
2
1
0
Ramtron
Density
Variation
0
0
0
0
0
0
0
0
0
1
0
0
0
0
1
1
N
V
V
V
0
0
0
0
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 FM24V05 will be:
0x00 0x43 0x00
The 3-byte hex code for an FM24VN05 will be:
0x00 0x43 0x80
The 3-byte hex code for an FM24VR05-G1 will be:
0x00 0x43 0x10
The 3-byte hex code for an FM24VR05-G2 will be:
0x00 0x43 0x20
The 3-byte hex code for an FM24VRN05-G1 will be:
0x00 0x43 0x90
The 3-byte hex code for an FM24VRN05-G2 will be:
0x00 0x43 0xA0


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