参数资料
型号: 24AA52-I/P
厂商: Microchip Technology
文件页数: 10/36页
文件大小: 0K
描述: IC EEPROM 2KBIT 400KHZ 8DIP
产品培训模块: I2C Serial EEPROM
标准包装: 60
格式 - 存储器: EEPROMs - 串行
存储器类型: EEPROM
存储容量: 2K (256 x 8)
速度: 100kHz,400kHz
接口: I²C,2 线串口
电源电压: 1.8 V ~ 5.5 V
工作温度: -40°C ~ 85°C
封装/外壳: 8-DIP(0.300",7.62mm)
供应商设备封装: 8-PDIP
包装: 管件
其它名称: 24AA52I/P
24AA52/24LCS52
7.0
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.
7.1
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 7-1, 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 7-1:
SETTING WRITE-PROTECT REGISTER
Bus Activity
Master
S
T
A
R
T
Control
Byte
Word
Address
Data
S
T
O
P
SDA Line
Bus Activity
S 0
1
1
0
A
C
K
A
C
K
A
C
K
P
7.2
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 7-2. 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 WC .
DS21166K-page 10
? 1996-2011 Microchip Technology Inc.
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