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CAT25M01XI.T2 Datasheet(PDF) 6 Page - ON Semiconductor

Part # CAT25M01XI.T2
Description  1 Mb SPI Serial CMOS EEPROM
Download  14 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CAT25M01XI.T2 Datasheet(HTML) 6 Page - ON Semiconductor

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CAT25M01
http://onsemi.com
6
Write Operations
The CAT25M01 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 correspon–ding
Status Register WEL bit are set by sending the WREN
instruction to the CAT25M01. 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 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
Note: Dashed Line = mode (1, 1)
CS
Figure 4. WRDI Timing
SCK
SI
SO
00
0
0
0
10
0
HIGH IMPEDANCE
Note: Dashed Line = mode (1, 1)
CS


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