FM25V05(2012) Просмотр технического описания (PDF) - Ramtron International Corporation
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FM25V05 Datasheet PDF : 16 Pages
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Sleep Mode
A low power mode called Sleep Mode is
implemented on the FM25V05 and FM25VN05
device. The device will enter this low power state
when the SLEEP op-code B9h is clocked-in and a
rising edge of /S is applied. Once in sleep mode, the
C and D pins are ignored and Q will be high-Z, but
the device continues to monitor the /S pin. On the
next falling edge of /S, the device will return to
normal operation within tREC (400 s max.). The Q
pin remains in a hi-Z state during the wakeup period.
The device will not necessarily respond to an opcode
within the wakeup period. To start the wakeup
procedure, the controller may send a “dummy” read,
for example, and wait the remaining tREC time.
FM25V05 - 512Kb SPI FRAM
Enter Sleep
Mode
S
C
D
Q
Figure 12. Sleep Mode Entry
Device ID
The FM25V05 and FM25VN05 device can be interrogated for its manufacturer, product identification, and die
revision. The RDID op-code 9Fh allows the user to read the manufacturer ID and product ID, both of which are
read-only bytes. The JEDEC-assigned manufacturer ID places the Ramtron identifier in bank 7, therefore there are
six bytes of the continuation code 7Fh followed by the single byte C2h. There are two bytes of product ID, which
includes a Family code, a Density code, a Sub code, and Product Revision code.
Table 6. Manufacturer and Product ID
Manufacturer ID
Bit
7 6 5 4 3 2 1 0 Hex
0 1 1 1 1 1 1 1 7F Continuation code
0 1 1 1 1 1 1 1 7F Continuation code
0 1 1 1 1 1 1 1 7F Continuation code
0 1 1 1 1 1 1 1 7F Continuation code
0 1 1 1 1 1 1 1 7F Continuation code
0 1 1 1 1 1 1 1 7F Continuation code
1 1 0 0 0 0 1 0 C2 JEDEC assigned Ramtron C2h in bank 7
Device ID (1st Byte)
Family
Density
Hex
0 0 1 0 0 0 1 1 23h Density: 01h=128K, 02h=256K, 03h=512K, 04=1M
Sub Rev.
Rsvd
Device ID (2nd Byte) 0 0 0 0 0 0 0 0 00h 00h=FM25V05, 01h=FM25VN05
S
C
.......
D
9Fh
Q
7Fh
…
7Fh
C2h
23h
00h
1
6
Six bytes of continuation code 7Fh
Figure 13. Read Device ID
Rev. 3.0
Jan. 2012
Page 9 of 16
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