收藏本站
24AA1026/24LC1026/24FC1026
5.0 DEVICE ADDRESSING
A control byte is the first byte received following the
FIGURE 5-1:
CONTROL BYTE
FORMAT
Start condition from the master device ( Figure 5-1 ).
The control byte consists of a 4-bit control code; for the
24XX1026, this is set as ‘ 1010 ’ binary for read and
write operations. The next two bits of the control byte
are the Chip Select bits (A2, A1). The Chip Select bits
Control Code
Read/Write Bit
Chip Block
Select Select
Bits Bit
allow the use of up to four 24XX1026 devices on the
same bus and are used to select which device is
S
1
0
1
0
A2
A1
B0 R/W ACK
accessed. The Chip Select bits in the control byte must
correspond to the logic levels on the corresponding A2
Slave Address
and A1 pins for the device to respond. These bits are in
effect the two Most Significant bits (MSb) of the word
address. The next bit of the control byte is the block
Start Bit
Acknowledge Bit
select bit (B0). This bit acts as the A16 address bit for
accessing the entire array.
The last bit of the control byte defines the operation to
be performed. When set to a one, a read operation is
selected, and when set to a zero, a write operation is
selected. The next two bytes received define the
address of the first data byte ( Figure 5-2 ). The upper
address bits are transferred first, followed by the Least
Significant bits (LSb).
Following the Start condition, the 24XX1026 monitors
the SDA bus checking the device type identifier being
transmitted. Upon receiving a ‘ 1010 ’ code and
appropriate device select bits, the slave device outputs
an Acknowledge signal on the SDA line. Depending on
the state of the R/W bit, the 24XX1026 will select a read
or write operation.
This device has an internal addressing boundary
limitation that is divided into two segments of 512K bits.
Block select bit ‘B0’ is used to control access to each
segment.
5.1 Contiguous Addressing Across
Multiple Devices
The Chip Select bits A2 and A1 can be used to expand
the contiguous address space for up to 4 Mbit by add-
ing up to four 24XX1026’s on the same bus. In this
case, software can use A1 of the control byte as
address bit A17 and A2 as address bit A18. It is not
possible to sequentially read across device boundar-
ies.
Each device has internal addressing boundary
limitations. This divides each part into two segments of
512K bits. The block select bit ‘B0’ controls access to
each “half”.
Sequential read operations are limited to 512K blocks.
To read through four devices on the same bus, eight
random Read commands must be given.
FIGURE 5-2:
ADDRESS SEQUENCE BIT ASSIGNMENTS
Control Byte
Address High Byte
Address Low Byte
0 R/W
1
0
1
0
A
2
A
1
B
A A A A A A
15 14 13 12 11 10
A
9
A
8
A
7
?
?
?
?
?
?
A
0
Control
Code
DS22270C-page 8
Chip Block
Select Select
Bits Bit
? 2011-2012 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
24FC128-I/MNY IC EEPROM 128KBIT 1MHZ 8TDFN
24FC515T-I/SM IC EEPROM 512KBIT 1MHZ 8SOIC
24FC64T-I/MF IC EEPROM 64KBIT 1MHZ 8DFN
24LC014H-I/P IC EEPROM 1KBIT 400KHZ 8DIP
24LC014T-E/OT IC EEPROM 1KBIT 400KHZ SOT23-6
24LC01B-I/SNG IC EEPROM 1KBIT 400KHZ 8SOIC
24LC024H-I/ST IC EEPROM 2KBIT 400KHZ 8TSSOP
24LC025T-E/MC IC EEPROM 2KBIT 400KHZ 8DFN
相关代理商/技术参数
24FC1026-I/SM 功能描述:电可擦除可编程只读存储器 1024K 128K X 8 2.5V HI-SPD EE 128BYTE PG RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8
24FC1026-I/SN 功能描述:电可擦除可编程只读存储器 1024K 128K X 8 2.5V HI-SPD EE 128BYTE PG RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8
24FC1026-I/ST 功能描述:电可擦除可编程只读存储器 1024K 128K X 8 2.5V HI-SP SER EE 128BYTE RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8
24FC1026T 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:1024K I2C? CMOS Serial EEPROM 100 kHz and 400 kHz Clock Compatibility
24FC1026T-I/SM 功能描述:电可擦除可编程只读存储器 1024K 128K X 8 2.5V HI-SPD EE 128BYTE PG RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8
24FC1026T-I/SN 功能描述:电可擦除可编程只读存储器 1024K 128K X 8 2.5V HI-SPD EE 128B PAGE RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8
24FC1026T-I/ST 功能描述:电可擦除可编程只读存储器 1024K 128K X 8 2.5V HI-SP SER EE 128BYTE RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8
24FC128 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:128K I2C CMOS Serial EEPROM