参数资料
型号: 24AA04H-I/P
厂商: Microchip Technology
文件页数: 6/28页
文件大小: 0K
描述: IC EEPROM 4KBIT 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: 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-DIP(0.300",7.62mm)
供应商设备封装: 8-PDIP
包装: 管件
24AA04H/24LC04BH
3.6
Device Addressing
FIGURE 3-2:
CONTROL BYTE
A control byte is the first byte received following the
Start condition from the master device (Figure 3-2).
The control byte consists of a four-bit control code. For
the 24XX04H, this is set as ‘ 1010 ’ binary for read and
ALLOCATION
Read/Write Bit
Block
write operations. The next three bits of the control byte
are the block-select bits (B2, B1, B0). B2 and B1 are a
“don’t care” for the 24XX04H. B0 is used by the master
Control Code
Select
Bits
device to select which of the two 256 word-blocks of
S
1
0
1
0
x
x
B0 R/W ACK
memory are to be accessed. These bits are in effect the
three Most Significant bits of the word address.
The last bit of the control byte defines the operation to
Slave Address
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 24XX04H monitors
the SDA bus, checking the device type identifier being
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
24XX04H will select a read or write operation.
Start Bit
x = “don’t care”
Acknowledge Bit
Operation
Read
Write
Control
Code
1010
1010
Block Select
Block Address
Block Address
R/W
1
0
DS22119A-page 6
? 2008 Microchip Technology Inc.
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