收藏本站
24AA02E48/24AA025E48
5.0 DEVICE ADDRESSING
A control byte is the first byte received following the
FIGURE 5-1:
CONTROL BYTE
ALLOCATION
Start condition from the master device. The control byte
consists of a four-bit control code. For the
24AAXXXE48, this is set as ‘ 1010 ’ binary for read and
write operations. For the 24AA02E48 the next three
bits of the control byte are “don’t cares”.
Control Code
Read/Write Bit
Chip
Select
Bits
For the 24AA025E48, the next three bits of the control
byte are the Chip Select bits (A2, A1, A0). The Chip
S
1
0
1
0
A2* A1* A0* R/W ACK
Select bits allow the use of up to eight 24AA025E48
devices on the same bus and are used to select which
device is accessed. The Chip Select bits in the control
Slave Address
byte must correspond to the logic levels on the corre-
sponding 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 the 6-pin SOT-23 package, the A2 address pin is
Start Bit
Note:
Acknowledge Bit
* Bits A0, A1 and A2 are “don’t cares” for
the 24AA02E48.
not available. During device addressing, the A2 Chip
Select bit should be set to ‘ 0 ’.
The last bit of the control byte defines the operation to
5.1
Contiguous Addressing Across
Multiple Devices
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 24AAXXXE48 moni-
tors the SDA bus, checking the device type identifier
being transmitted and, upon a ‘ 1010 ’ code, the slave
device outputs an Acknowledge signal on t h e SDA line.
Depending on the state of the R/W bit, the
24AAXXXE48 will select a read or write operation.
The Chip Select bits A2, A1 and A0 can be used to
expand the contiguous address space for up to 16K bits
by adding up to eight 24AA025E48 devices on the
same bus. In this case, software can use A0 of the con-
trol byte as address bit A8, A1 as address bit A9 and
A2 as address bit A10. It is not possible to sequentially
read across device boundaries.
For the SOT-23 package, up to four 24AA025E48
Operation
Read
Write
Control
Code
1010
1010
Chip Select
Chip Address
Chip Address
R/W
1
0
devices can be added for up to 8K bits of address
space. In this case, software can us A0 of the control
byte as address bit A8, and A1 as address bit A9. It is
not possible to sequentially read across device
boundaries.
FIGURE 5-2:
ADDRESS SEQUENCE BIT ASSIGNMENTS
Control Byte
Address Low Byte
1
0
1
0 A2* A1* A0* R/W
A
7
?
?
?
?
?
?
A
0
Control
Code
Chip
Select
bits
Note:
DS22124D-page 8
* Bits A0, A1 and A2 are “don’t cares” for the 24AA02E48.
? 2010 Microchip Technology Inc.
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
24AA02H-I/MS IC EEPROM 2KBIT 400KHZ 8MSOP
24AA02T/ST IC EEPROM 2KBIT 400KHZ 8TSSOP
24AA08/ST IC EEPROM 8KBIT 400KHZ 8TSSOP
24AA16-I/STG IC EEPROM 16KBIT 400KHZ 8TSSOP
24AA256-I/MS IC EEPROM 256KBIT 400KHZ 8MSOP
24AA32A/SN IC EEPROM 32KBIT 400KHZ 8SOIC
24AA32AF-I/SN IC SRL EEPROM 4KX8 1.8V 8-SOIC
24AA512-I/ST14 IC EEPROM 512KBIT 400KHZ 14TSSOP
相关代理商/技术参数
24AA025E48T-IOT 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:2K I2C? Serial EEPROMs with EUI-48? Node Identity
24AA025E48T-ISN 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:2K I2C? Serial EEPROMs with EUI-48? Node Identity
24AA025E48-TOT 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:2K I2C? Serial EEPROMs with EUI-48? Node Identity
24AA025E48-TSN 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:2K I2C? Serial EEPROMs with EUI-48? Node Identity
24AA025E48T-TOT 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:2K I2C? Serial EEPROMs with EUI-48? Node Identity
24AA025E48T-TSN 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:2K I2C? Serial EEPROMs with EUI-48? Node Identity
24AA025E64 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:2K I2Ca?￠ Serial EEPROMs with EUI-48a?￠ or EUI-64a?￠ Node Identity
24AA025E64-E/SN 功能描述:IC EEPROM 2KBIT 制造商:microchip technology 系列:- 包装:管件 零件状态:有效 格式 - 存储器:EEPROM - 串行（带 MAC 地址） 存储器类型:EEPROM 存储容量:2K（256 x 8） 速度:100kHz，400kHz 接口:I2C，2 线串口 电压 - 电源:1.7 V ~ 5.5 V 工作温度:-40°C ~ 125°C（TA） 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商器件封装:8-SOIC 标准包装:100