参数资料
| 型号： | 24AA04T-I/SN |
| 厂商： | Microchip Technology |
| 文件页数： | 7/34页 |
| 文件大小： | 0K |
| 描述： | IC EEPROM 4KBIT 400KHZ 8SOIC |
| 产品培训模块： | I2C Serial EEPROM |
| 标准包装： | 3,300 |
| 格式 - 存储器： | EEPROMs - 串行 |
| 存储器类型： | EEPROM |
| 存储容量： | 4K (2 x 256 x 8) |
| 速度： | 100kHz，400kHz |
| 接口： | I²C，2 线串口 |
| 电源电压： | 1.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOICN |
| 包装： | 带卷 (TR) |
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24AA04/24LC04B
5.0 DEVICE ADDRESSING
A control byte is the first byte received following the
Start condition from the master device. The control byte
consists of a four-bit control code. For the 24XX04, this
is set as ‘ 1010 ’ binary for read and write operations.
Operation
Read
Write
Control
Code
1010
1010
Block Select
Block Address
Block Address
R/W
1
0
The next two bits of the control byte are “don’t cares” for
the 24XX04. The last bit, B0, is used by the master
device to select which of the two 256-word blocks of
memory are to be accessed. This bit is, in effect, the
Most Significant bit of the word address.
The last bit of the control byte defines the operation to
FIGURE 5-1:
CONTROL BYTE
ALLOCATION
Read/Write Bit
Block
be performed. When set to ‘ 1 ’, a read operation is
selected. When set to ‘ 0 ’, a write operation is selected.
Following the Start condition, the 24XX04 monitors the
Control Code
Select
Bits
SDA bus checking the device type identifier being
S
1
0
1
0
x
x
B0 R/W ACK
transmitted and, upon receiving a ‘ 1010 ’ code, the
slave device outputs an Acknowledge signal on the
SDA line. Depending on the state of the R/W bit, the
24XX04 will select a read or write operation.
Start Bit
x = “don’t care”
Slave Address
Acknowledge Bit
FIGURE 5-2:
ADDRESS SEQUENCE BIT ASSIGNMENTS
Control Byte
Address Low Byte
0 R/W
1
0
1
0
x
x
B
A
7
?
?
?
?
?
?
A
0
Control
Code
Block
Select
bits
x = “don’t care”
? 2009 Microchip Technology Inc.
DS21708K-page 7
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