參數(shù)資料
型號： 24AA512T-EST
廠商： Microchip Technology Inc.
英文描述： I2C⑩ Serial EEPROM Family Data Sheet
中文描述： ⑩的I2C串行EEPROM系列數(shù)據(jù)手冊
文件頁數(shù)： 19/42頁
文件大?。?/td> 540K
代理商： 24AA512T-EST
2007 Microchip Technology Inc.
DS21930B-page 19
24AAXX/24LCXX/24FCXX
8.0
READ OPERATION
Read operations are initiated in much the same way as
write operations with the exception that the R/W bit of
the control byte is set to ‘
1
’. There are three basic types
of read operations: current address read, random read
and sequential read.
8.1
Current Address Read
The 24XX contains an address counter that maintains
the address of the last byte accessed, internally incre-
mented by ‘
1
’. Therefore, if the previous read or write
operation was to address ‘
n
’ (
n
is any legal address),
the next current address read operation would access
data from address
n +
1
.
Upon receipt of the control byte with R/W bit set to ‘
1
’,
the 24XX issues an acknowledge and transmits the
8-bit data byte. The master will not acknowledge the
transfer, but does generate a Stop condition and the
24XX discontinues transmission (Figure 8-1).
FIGURE 8-1:
CURRENT ADDRESS
READ
8.2
Random Read
Random read operations allow the master to access
any memory location in a random manner. To perform
this type of read operation, the byte address must first
be set. This is done by sending the byte address to the
24XX as part of a write operation (R/W bit set to ‘
0
’
).
Once the byte address is sent, the master generates a
Start condition following the acknowledge. This termi-
nates the write operation, but not before the internal
address counter is set. The master then issues the
control byte again, but with the R/W bit set to a ‘
1
’. The
24XX will then issue an acknowledge and transmit the
8-bit data byte. The master will not acknowledge the
transfer but does generate a Stop condition, which
causes the 24XX to discontinue transmission
(Figure 8-2 and Figure 8-3). After a random Read
command, the internal address counter will increment
to the next address location.
FIGURE 8-2:
RANDOM READ: 128-BIT TO 16 KBIT DEVICES
FIGURE 8-3:
RANDOM READ: 32 TO 512 KBIT DEVICES
Bus Activity
Master
SDA Line
Bus Activity
P
S
S
T
O
P
Control
Byte
S
T
A
R
T
Data
Byte
A
C
K
N
O
A
C
K
S
P
S
Bus Activity
Master
SDA Line
Bus Activity
S
T
A
R
T
S
T
O
P
Control
Byte
A
C
K
Address
Byte (n)
Control
Byte
S
T
A
R
T
Data
Byte
A
C
K
A
C
K
N
O
A
C
K
Bus Activity
Master
SDA Line
Bus Activity
A
C
K
N
O
A
C
K
A
C
K
A
C
K
A
C
K
S
T
O
P
S
T
A
R
T
Control
Byte
High Order
Address Byte
Low Order
Address Byte
Control
Byte
Data
Byte
S
T
A
R
T
S
S
P
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
24AA512T-I/CS17K 功能描述:電可擦除可編程只讀存儲器 512K 64K x 8, 1.8V SERIAL EE IND RoHS:否 制造商:Atmel 存儲容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時鐘頻率: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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8
24AA512T-I/MF 功能描述:電可擦除可編程只讀存儲器 64kx8 - 1.8V RoHS:否 制造商:Atmel 存儲容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時鐘頻率: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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8
24AA512T-I/MNY 制造商:Microchip Technology Inc 功能描述:IC EEPROM 512KBIT 400KHZ 8TDFN 制造商:Microchip Technology Inc 功能描述:512K, 64K X 8, 1.8V SER EE, IND, 8 TDFN 2x3x0.8mm T/R
24AA512T-I/MS 制造商:Microchip Technology Inc 功能描述:IC EEPROM 512KBIT 400KHZ 8MSOP 制造商:Microchip Technology Inc 功能描述:512K, 64K X 8, 1.8V SER EE, IND, 8 MSOP 3x3mm T/R
24AA512T-I/SM 功能描述:電可擦除可編程只讀存儲器 64kx8 - 1.8V RoHS:否 制造商:Atmel 存儲容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時鐘頻率: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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8
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