参数资料
| 型号： | 24AA32A-I/P |
| 厂商： | Microchip Technology |
| 文件页数： | 7/44页 |
| 文件大小： | 0K |
| 描述： | IC EEPROM 32KBIT 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： | 32K (4K 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 |
| 产品目录页面： | 1446 (CN2011-ZH PDF) |
| 其它名称： | 24AA32AI/P |
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24AA32A/24LC32A
5.0 DEVICE ADDRESSING
A control byte is the first byte received following the
Start condition from the master device (Figure 5-1).
an Acknowledge signal on the SDA line. Depending on
the state of the R/W bit, the 24XX32A will select a read
or write operation.
The control byte consists of a four-bit control code. For
the 24XX32A, 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
FIGURE 5-1:
CONTROL BYTE FORMAT
Read/Write Bit
bits allow the use of up to eight 24XX32A devices on
the same bus and are used to select which device is
accessed. The Chip Select bits in the control byte must
Control Code
Chip Select
Bits
correspond to the logic levels on the corresponding A2,
A1 and A0 pins for the device to respond. These bits
S
1
0
1
0
A2 A1 A0 R/W ACK
are in effect the three Most Significant bits of the word
address.
Slave Address
For the SOT-23 and chip scale packages, the address
pins are not available. During device addressing, the
A1, A2, and A0 Chip Selects bits (Figure 5-2) should be
Start Bit
Acknowledge Bit
set to ‘ 0 ’.
5.1
Contiguous Addressing Across
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 zero, a write operation is
selected. The next two bytes received define the
address of the first data byte (Figure 5-2). Because
only A11 to A0 are used, the upper four address bits are
“don’t care” bits. The upper address bits are transferred
first, followed by the Less Significant bits.
Following the Start condition, the 24XX32A monitors
the SDA bus checking the device type identifier being
transmitted and, upon receiving a ‘ 1010 ’ code and
appropriate device select bits, the slave device outputs
Multiple Devices
The Chip Select bits A2, A1 and A0 can be used to
expand the contiguous address space for up to 256K
bits by adding up to eight 24XX32A devices on the
same bus. In this case, software can use A0 of the con-
trol byte as address bit A12; A1 as address bit A13; and
A2 as address bit A14. It is not possible to sequentially
read across device boundaries.
The SOT-23 and chip scale packages do not support
multiple device addressing on the same bus.
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
A
x
x
x
x
A A
11 10
A
9
A
8
A
7
?
?
?
?
?
?
A
0
Control
Code
Chip
Select
Bits
x = “don’t care” bit
? 2002-2012 Microchip Technology Inc.
DS21713M-page 7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 24AA32ASC-I/S16K | 制造商:Microchip Technology Inc 功能描述:32K I2C SMARTCARD EE DIE IN WAFFLE PK - Gel-pak, waffle pack, wafer, diced wafer on film |
| 24AA32ASC-I/W16K | 制造商:Microchip Technology Inc 功能描述:32K I2C SMARTCARD EE WAFER - Gel-pak, waffle pack, wafer, diced wafer on film |
| 24AA32ASC-I/WF16K | 制造商:Microchip Technology Inc 功能描述:32K I2C SMARTCARD EE WFR ON FR - Gel-pak, waffle pack, wafer, diced wafer on film |
| 24AA32AT/SM | 功能描述:电可擦除可编程只读存储器 4kx8 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 |
| 24AA32AT/SN | 功能描述:电可擦除可编程只读存储器 4kx8 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 |
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