24AA52_05 Datasheet, PDF (10/28 Pages) Microchip Technology – 2K 2.2V I2C™ Serial EEPROM with Software Write-Protect

24AA52/24LCS52
FIGURE 6-2:
RESETTING WRITE-PROTECT FUSE (RWPF)
WP = VHH = VCC + 5.5V
Bus Activity
Master
SDA Line
Bus Activity
1μs
S
RWPF
Command
T
A
R
Control
Byte
T
1 00 1 0 0 0S1 0 1 0 0 0 00
Word
Address (0x09)
Data (0xFF)
TWC
S
T
O
P
00001001 11111111 P
A
A
A
C
C
C
K
K
K
Note: Clock = 100 kHz, VDD = 1.8V to 5.5V
6.3 Hardware Write-Protect
The WP pin can be tied to VCC or VSS. If tied to VCC, the
entire array will be write-protected, regardless of
whether the software write-protect register has been
written or not. If the WP pin is set to VCC, it will prevent
the software write-protect register from being written. If
the WP is tied to VSS, write protection is determined by
the status of the software write-protect register for
addresses 00h-7Fh. Addresses 80h-FFh are solely
protected by the WP pin level.
DS21166J-page 10
© 2005 Microchip Technology Inc.