参数资料
| 型号： | 24AA32A-I/P |
| 厂商： | Microchip Technology |
| 文件页数： | 11/44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
8.0
READ OPERATION
8.3
Sequential Read
Read operations are initiated in the same way as write
operations, with the exception that the R/W bit of the
control byte is set to ‘ 1 ’. There are three basic types of
read operations: current address read, random read
and sequential read.
8.1 Current Address Read
The 24XX32A contains an address counter that main-
tains the address of the last word accessed, internally
incremented by ‘ 1 ’. Therefore, if the previous read
access was to address ‘n’ (n is any legal address), the
next current address read operation would access data
from address n + 1 .
Upon receipt of the control byte with R/W bit set to ‘ 1 ’,
the 24XX32A issues an acknowledge and transmits the
8-bit data word. The master will not acknowledge the
transfer, but does generate a Stop condition and the
24XX32A discontinues transmission (Figure 8-1).
Sequential reads are initiated in the same way as a
random read, except that once the 24XX32A transmits
the first data byte, the master issues an acknowledge
as opposed to the Stop condition used in a random
read. This acknowledge directs the 24XX32A to
transmit the next sequentially addressed 8-bit word
(Figure 8-3). Following the final byte transmitted to the
master, the master will NOT generate an acknowledge,
but will generate a Stop condition. To provide sequen-
tial reads, the 24XX32A contains an internal Address
Pointer which is incremented by ‘ 1 ’ upon completion of
each operation. This Address Pointer allows the entire
memory contents to be serially read during one
operation. The internal Address Pointer will automati-
cally roll over from address FFF to address 000 if the
master acknowledges the byte received from the array
address FFF.
8.2
Random Read
Random read operations allow the master to access
any memory location in a random manner. To perform
this type of read operation, the word address must
first be set. This is accomplished by sending the word
address to the 24XX32A as part of a write operation
(R/W bit set to ‘ 0 ’). Once the word address is sent, the
master generates a Start condition following the
acknowledge. This terminates the write operation, but
not before the internal Address Pointer is set. The
master issues the control byte again, but with the R/W
bit set to a ‘ 1 ’. The 24XX32A will then issue an
acknowledge and transmit the 8-bit data word. The
master will not acknowledge the transfer, but does
generate a Stop condition which causes the 24XX32A
to discontinue transmission (Figure 8-2). After a
random Read command, the internal address counter
will point to the address location following the one that
was just read.
FIGURE 8-1:
CURRENT ADDRESS READ
Bus Activity
Master
S
T
A
R
T
Control
Byte
Data (n)
S
T
O
P
SDA Line
Bus Activity
? 2002-2012 Microchip Technology Inc.
S
A
C
K
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DS21713M-page 11
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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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