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FM24V10 データシート(PDF) 9 Page - Cypress Semiconductor

部品番号 FM24V10
部品情報  1Mb Serial 3V F-RAM Memory
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メーカー  CYPRESS [Cypress Semiconductor]
ホームページ  http://www.cypress.com
Logo CYPRESS - Cypress Semiconductor

FM24V10 データシート(HTML) 9 Page - Cypress Semiconductor

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FM24V10 - 1Mb I2C FRAM
Rev. 3.0
Jan. 2012
Page 9 of 16
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 I
2C-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
I
2C-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 FM24V10
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
X X
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
1
0
0
N
0
0
0
0
0
0
0
Figure 14. Manufacturer and Product ID
Density: 01h=128Kb, 02h=256Kb, 03h=512Kb, 04=1Mb
Variation: Product ID bit 4 = S/N, 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


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