24LCS52/ST Microchip Technology, 24LCS52/ST Datasheet - Page 9
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24LCS52/ST
Manufacturer Part Number
24LCS52/ST
Description
IC,SERIAL EEPROM,256X8,CMOS,TSSOP,8PIN,PLASTIC
Manufacturer
Microchip Technology
Datasheet
1.24AA52-ISN.pdf
(28 pages)
Specifications of 24LCS52/ST
Rohs Compliant
YES
Format - Memory
EEPROMs - Serial
Memory Type
EEPROM
Memory Size
2K (256 x 8)
Speed
100kHz, 400kHz
Interface
I²C, 2-Wire Serial
Voltage - Supply
2.2 V ~ 5.5 V
Operating Temperature
0°C ~ 70°C
Package / Case
8-TSSOP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
24LCS52/ST
Manufacturer:
MICROCHIP
Quantity:
12 000
Part Number:
24LCS52/ST
Manufacturer:
MICROCHIP/微芯
Quantity:
20 000
6.0
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
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:
6.2
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 S before the command is given. The
customer should also allow for a 5 ms delay after the
Stop bit for T
© 2005 Microchip Technology Inc.
SDA Line
Bus Activity
Master
Bus Activity
WRITE PROTECTION
Software Write-Protect
Resetting the Software
Write-Protect Fuse
WC
.
S
T
A
R
T
S
SETTING WRITE-PROTECT REGISTER
0
1
1
Control
Byte
0
A
C
K
Address
Word
24AA52/24LCS52
A
C
K
Data
DS21166J-page 9
A
C
K
P
S
T
O
P