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CAV25040 Datasheet(PDF) 5 Page - ON Semiconductor

Part # CAV25040
Description  SPI Serial CMOS EEPROM
Download  12 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CAV25040 Datasheet(HTML) 5 Page - ON Semiconductor

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CAV25010, CAV25020, CAV25040
http://onsemi.com
5
Table 8. STATUS REGISTER
7
6
5
4
3
2
1
0
1
1
1
1
BP1
BP0
WEL
RDY
Table 9. BLOCK PROTECTION BITS
Status Register Bits
Array Address Protected
Protection
BP1
BP0
0
0
None
No Protection
0
1
CAV25010: 060−07F, CAV25020: 0C0−0FF, CAV25040: 180−1FF
Quarter Array Protection
1
0
CAV25010: 040−07F, CAV25020: 080−0FF, CAV25040: 100−1FF
Half Array Protection
1
1
CAV25010: 000−07F, CAV25020: 000−0FF, CAV25040: 000−1FF
Full Array Protection
WRITE OPERATIONS
The CAV25010/20/40 device powers up into a write
disable state. The device contains a Write Enable Latch
(WEL) which must be set before attempting to write to the
memory array or to the status register. In addition, the
address of the memory location(s) to be written must be
outside the protected area, as defined by BP0 and BP1 bits
from the status register.
Write Enable and Write Disable
The internal Write Enable Latch and the corresponding
Status Register WEL bit are set by sending the WREN
instruction to the CAV25010/20/40. Care must be taken to
take the CS input high after the WREN instruction, as
otherwise the Write Enable Latch will not be properly set.
WREN timing is illustrated in Figure 3. The WREN
instruction must be sent prior to any WRITE or WRSR
instruction.
The internal write enable latch is reset by sending the
WRDI instruction as shown in Figure 4. Disabling write
operations by resetting the WEL bit, will protect the device
against inadvertent writes.
Figure 3. WREN Timing
SCK
SI
SO
00
0
0
0
11
0
HIGH IMPEDANCE
Dashed Line = mode (1, 1)
CS
Figure 4. WRDI Timing
SCK
SI
SO
0
0
000
10
0
HIGH IMPEDANCE
Dashed Line = mode (1, 1)
CS


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