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參數資料
| 型號： | 24AA025 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 2K I2C⑩ Serial EEPROM |
| 中文描述： | ⑩2K的I2C串行EEPROM |
| 文件頁數： | 10/26頁 |
| 文件大?。?/td> | 306K |
| 代理商： | 24AA025 |
24AA024/24LC024/24AA025/24LC025
DS21210K-page 10
2007 Microchip Technology Inc.
8.0
READ OPERATIONS
Read operations are initiated in the same way as write
operations, with the exception that the R/W bit of the
slave address 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 24AA024/24LC024/24AA025/24LC025 contains
an address counter that maintains the address of the
last word accessed, internally incremented by one.
Therefore, if the previous read access was to address
n, the next current address read operation would
access data from address n + 1. Upon receipt of the
slave address with the R/W bit set to ‘
1
’, the 24AA024/
24LC024/24AA025/24LC025 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
24AA024/24LC024/24AA025/
24LC025 discontinues transmission (Figure 8-1).
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 24AA024/24LC024/24AA025/24LC025
as part of a write operation. 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 then issues the control byte again, but with the
R/W bit set to a ‘
1
’. The 24AA024/24LC024/24AA025/
24LC025 will then issue an acknowledge and transmits
the eight bit data word. The master will not acknowl-
edge the transfer but does generate a Stop condition
and
the
24AA024/24LC024/24AA025/24LC025
discontinues transmission (Figure 8-2). After this
command, the internal address counter will point to the
address location following the one that was just read.
8.3
Sequential Read
Sequential reads are initiated in the same way as a
random read except that after the 24AA024/24LC024/
24AA025/24LC025 transmits the first data byte, the
master issues an acknowledge (as opposed to a Stop
condition in a random read). This directs the 24AA024/
24LC024/24AA025/24LC025 to transmit the next
sequentially-addressed 8-bit word (Figure 8-3).
To provide sequential reads, the 24AA024/24LC024/
24AA025/24LC025 contains an internal Address
Pointer that is incremented by one upon completion of
each operation. This Address Pointer allows the entire
memory contents to be serially read during one
operation.
The
internal
automatically roll over from address 0FFh to address
000h.
Address
Pointer
will
FIGURE 8-1:
CURRENT ADDRESS
READ
BUS ACTIVITY
MASTER
SDA LINE
BUS ACTIVITY
P
S
S
T
O
P
Control
Byte
S
T
A
R
T
Data
A
C
K
N
O
A
C
K
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相關代理商/技術參數 |
參數描述 |
|---|---|
| 24AA025E48 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:2K I2C? Serial EEPROMs with EUI-48? Node Identity |
| 24AA025E48-E/SN | 功能描述:IC EEPROM 2KBIT 制造商:microchip technology 系列:- 包裝:管件 零件狀態(tài):有效 格式 - 存儲器:EEPROM - 串行（帶 MAC 地址） 存儲器類型:EEPROM 存儲容量:2K（256 x 8） 速度:100kHz，400kHz 接口:I2C，2 線串口 電壓 - 電源:1.7 V ~ 5.5 V 工作溫度:-40°C ~ 125°C（TA） 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應商器件封裝:8-SOIC 標準包裝:100 |
| 24AA025E48-I | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:2K I2C Serial EEPROMs with EUI-48a?￠ Node Identity |
| 24AA025E48-I/SN | 功能描述:電可擦除可編程只讀存儲器 2K 256 X 8 1.8V SERIAL EE, IND RoHS:否 制造商:Atmel 存儲容量:2 Kbit 組織:256 B x 8 數據保留:100 yr 最大時鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| 24AA025E48-IOT | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:2K I2C? Serial EEPROMs with EUI-48? Node Identity |
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