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參數(shù)資料
| 型號(hào)： | 24AA52_05 |
| 廠商： | Microchip Technology Inc. |
| 元件分類： | EEPROM |
| 英文描述： | 2K 2.2V I2C⑩ Serial EEPROM with Software Write-Protect |
| 中文描述： | ⑩2K 2.2伏的I2C串行EEPROM與軟件寫保護(hù) |
| 文件頁數(shù)： | 9/28頁 |
| 文件大?。?/td> | 350K |
| 代理商： | 24AA52_05 |
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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
μ
S before the command is given. The
customer should also allow for a 5 ms delay after the
Stop bit for T
WC
.
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
0
0
1
1
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 24AA52-I/MC | 功能描述:電可擦除可編程只讀存儲(chǔ)器 256x8 - 2.5V Industrial Temp RoHS:否 制造商:Atmel 存儲(chǔ)容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時(shí)鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| 24AA52-I/MCG | 功能描述:電可擦除可編程只讀存儲(chǔ)器 256x8 - 2.5V Industrial Temp RoHS:否 制造商:Atmel 存儲(chǔ)容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時(shí)鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| 24AA52-I/MS | 功能描述:電可擦除可編程只讀存儲(chǔ)器 256x8 - 1.8V RoHS:否 制造商:Atmel 存儲(chǔ)容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時(shí)鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| 24AA52-I/MSG | 功能描述:電可擦除可編程只讀存儲(chǔ)器 256x8 - 1.8V Lead Free Package RoHS:否 制造商:Atmel 存儲(chǔ)容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時(shí)鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| 24AA52-I/P | 功能描述:電可擦除可編程只讀存儲(chǔ)器 256x8 - 1.8V RoHS:否 制造商:Atmel 存儲(chǔ)容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時(shí)鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 |
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