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24LCS52-/MCG 数据表(PDF) 9 Page - Microchip Technology

部件名 24LCS52-/MCG
功能描述  2K 2.2V I2C??Serial EEPROM with Software Write-Protect
PDF  28 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

24LCS52-/MCG 数据表(HTML) 9 Page - Microchip Technology

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© 2005 Microchip Technology Inc.
DS21166J-page 9
24AA52/24LCS52
6.0
WRITE PROTECTION
The 24XXX52 has a software write-protect feature that
allows the lower half of the array (addresses 00h-7Fh)
to be permanently write-protected, as well as a WP pin
that can be used to protect the entire array.
6.1
Software Write-Protect
The software write-protect feature is invoked by writing
to the write-protect register. This is done by sending a
command similar to a normal Write command. As shown
in Figure 6-1, the write-protect register is written by
sending a Write command with the slave address set to
‘0110’ instead of ‘1010’ and the address bits and data
bits are “don’t cares.” Once the software write-protect
register
has
been
written,
the
device
will
not
acknowledge the ‘0110’ control byte.
FIGURE 6-1:
SETTING WRITE-PROTECT REGISTER
6.2
Resetting the Software
Write-Protect Fuse
It is possible to reset the software write-protect feature
on the 24XXX52. This is done by sending a command
similar to setting the software write-protect command,
except the command is sent before the regular control
byte and is ‘1001’ . The full command will be shown in
Figure 6-2. In order for the command to work, a voltage
of Vcc + 5.5V must be applied to the WP pin and must
be sustained for 1
μS before the command is given. The
customer should also allow for a 5 ms delay after the
Stop bit for TWC.
S
P
Bus Activity
Master
SDA Line
Bus Activity
S
T
A
R
T
S
T
O
P
Control
Byte
Word
Address
Data
A
C
K
A
C
K
A
C
K
00
1
1



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