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參數(shù)資料
| 型號： | 24AA256T-EP |
| 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)： | 14/42頁 |
| 文件大?。?/td> | 540K |
| 代理商： | 24AA256T-EP |
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24AAXX/24LCXX/24FCXX
DS21930B-page 14
2007 Microchip Technology Inc.
5.7
Device Addressing For Devices
With Functional Address Pins
A control byte is the first byte received following the
Start condition from the master device (Figure 5-4).
The control byte begins with a 4-bit control code. For
the 24XX, this is set as ‘
1010
’
binary for read and write
operations. The next three bits of the control byte are
the Chip Select bits (A2, A1, A0). The Chip Select bits
allow the use of up to eight 24XX devices on the same
bus and are used to select which device is accessed.
The Chip Select bits in the control byte must corre-
spond to the logic levels on the corresponding A2, A1
and A0 pins for the device to respond. These bits are,
in effect, the three Most Significant bits of the word
address.
For 24XX128 and 24XX256 in the MSOP package, the
A0 and A1 pins are not connected. During device
addressing, the A0 and A1 Chip Select bits (Figure 5-4)
should be set to ‘
0
’. Only two 24XX128 or 24XX256
MSOP packages can be connected to the same bus.
The last bit of the control byte defines the operation to
be performed. When set to a ‘
1
’, a read operation is
selected. When set to a ‘
0
’, a write operation is
selected.
For
24XX512), the next two bytes received define the
address of the first data byte. Depending on the prod-
uct density, not all bits in the address high byte are
used. A15, A14, A13 and A12 are “don’t care” for
24XX32. A15, A14 and A13 are “don’t care” for
24XX64. A15 and A14 are “don’t care” for 24XX128.
A15 is “don’t care” for 24XX256. All address bits are
used for the 24XX512. The upper address bits are
transferred first, followed by the Less Significant bits.
higher
density devices
(24XX32
through
Following the Start condition, the 24XX monitors the
SDA bus. Upon receiving a ‘
1010
’
code, appropriate
device select bits and the R/W bit, the slave device out-
puts an Acknowledge signal on the SDA line. The
address byte(s) follow the acknowledge.
FIGURE 5-4:
CONTROL AND ADDRESS BYTE ASSIGNMENTS FOR
DEVICES WITH ADDRESS PINS
S
1
0
1
0
A2 A1 A0
R/W
ACK
S
1
0
1
0
A2 A1 A0
R/W
ACK
S
1
0
1
0
A2 A1 A0
R/W
ACK
S
1
0
1
0
A2 A1 A0
R/W
ACK
S
1
0
1
0
A2 A1 A0
R/W
ACK
24XX64
24XX128
24XX256
24XX512
x
= “don’t care” bit
Acknowledge
bit
Control Code
Start bit
Control Byte
Chip Select bits*
Address High Byte
24XX32
Read/Write bit
(Read =
1
, Write =
0
)
x
x
x
x
A11
A10
A9
A8
x
x
x
A12
A11
A10
A9
A8
x
x
A13
A12
A11
A10
A9
A8
x
A14
A13
A12
A11
A10
A9
A8
A15 A14
A13
A12
A11
A10
A9
A8
S
1
0
1
0
A2
A1
A0
R/W
ACK
S
1
0
1
0
A2
A1
A0
R/W
ACK
S
1
0
1
0
A2
A1
A0
R/W
ACK
x
A6
.
.
.
.
.
A0
A7
.
.
.
.
.
.
A0
A7
.
.
.
.
.
.
A0
24XX024/025
24C02C
24C01C
Address Byte
A7
.
.
.
.
.
.
A0
A7
.
.
.
.
.
.
A0
A7
.
.
.
.
.
.
A0
A7
.
.
.
.
.
.
A0
A7
.
.
.
.
.
.
A0
Address Low Byte
* Chip Select bits A1 and A0 must be set to ‘
0
’ for 24XX128/256 devices in the MSOP package.
Control Byte
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 24AA256T-ESM | I2C⑩ Serial EEPROM Family Data Sheet |
| 24AA256T-ESN | I2C⑩ Serial EEPROM Family Data Sheet |
| 24AA256T-EST | I2C⑩ Serial EEPROM Family Data Sheet |
| 24AA512-EMC | I2C⑩ Serial EEPROM Family Data Sheet |
| 24AA512-EMF | I2C⑩ Serial EEPROM Family Data Sheet |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 24AA256T-I/CS16K | 功能描述:電可擦除可編程只讀存儲器 256K 32K X 8 1.8V SER EE IND RoHS:否 制造商:Intersil 存儲容量: 組織: 數(shù)據(jù)保留: 最大時(shí)鐘頻率: 最大工作電流: 工作電源電壓: 最大工作溫度: 安裝風(fēng)格: 封裝 / 箱體: |
| 24AA256T-I/MF | 功能描述:電可擦除可編程只讀存儲器 256K 32K X 8 1.8V SER 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(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 |
| 24AA256T-I/MNY | 功能描述:電可擦除可編程只讀存儲器 256K, 32Kx8, 1.8V SER EE, ExT 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(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 |
| 24AA256T-I/MS | 功能描述:電可擦除可編程只讀存儲器 32kx8 - 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(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 |
| 24AA256T-I/MSG | 功能描述:電可擦除可編程只讀存儲器 32kx8 - 1.8V Lead Free Package 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(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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