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参数资料
| 型号： | 24AA512-I/ST |
| 厂商： | Microchip Technology |
| 文件页数： | 13/36页 |
| 文件大小： | 0K |
| 描述： | EEPROM 512KB 1.8V 400KHZ 8TSSOP |
| 标准包装： | 100 |
| 格式 - 存储器： | EEPROMs - 串行 |
| 存储器类型： | EEPROM |
| 存储容量： | 512K (64K 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-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 8-TSSOP |
| 包装： | 管件 |
| 产品目录页面： | 1447 (CN2011-ZH PDF) |
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24AA512/24LC512/24FC512
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 24XX512 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 24XX512 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
24XX512 discontinues transmission (Figure 8-1).
Sequential reads are initiated in the same way as a
random read except that after the 24XX512 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 24XX512 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
sequential reads, the 24XX512 contains an internal
Address Pointer which is incremented by one at the
completion of each operation. This Address Pointer
allows the entire memory contents to be serially read
during one operation. The internal Address Pointer will
automatically roll over from address FFFF to address
0000 if the master acknowledges the byte received
from the array address FFFF.
FIGURE 8-1:
CURRENT ADDRESS
READ
Bus Activity
Master
S
T
A
R
T
Control
Byte
Data
Byte
S
T
O
P
S 1 0 1 0 A AA 1
SDA Line
Bus Activity
2 1 0
A
C
K
N
O
A
C
K
P
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, first the word address must
be set. This is done by sending the word address to the
24XX512 as part of a write operation (R/W bit set to
‘ 0 ’). After 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. Then, the master issues
the control byte again but with the R/W bit set to a one.
The 24XX512 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 24XX512 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.
? 2010 Microchip Technology Inc.
DS21754M-page 13
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 24AA512SC-I/S17K | 功能描述:SERIAL EEPROM WAFER 制造商:microchip technology 系列:- 零件状态:在售 存储器类型:非易失 存储器格式:EEPROM 技术:EEPROM 存储容量:512Kb （64K x 8） 时钟频率:400kHz 写周期时间 - 字，页:5ms 访问时间:900ns 存储器接口:I2C 电压 - 电源:1.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C（TA） 标准包装:5,000 |
| 24AA512SC-I/S22K | 制造商:Microchip Technology Inc 功能描述:512K, 64K X 8, 1.8V SER EE,DIE in WAFFLE PK, 0 DICE WPAC |
| 24AA512SC-I/W17K | 功能描述:SERIAL EEPROM WAFER 制造商:microchip technology 系列:- 零件状态:在售 存储器类型:非易失 存储器格式:EEPROM 技术:EEPROM 存储容量:512Kb （64K x 8） 时钟频率:400kHz 写周期时间 - 字，页:5ms 访问时间:900ns 存储器接口:I2C 电压 - 电源:1.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C（TA） 标准包装:5,000 |
| 24AA512SC-I/W22K | 制造商:Microchip Technology Inc 功能描述:512K, 64K X 8, 1.8V SER EE,WAFER, 0 WAFER WJAR |
| 24AA512SC-I/WF17K | 功能描述:SERIAL EEPROM WAFER 制造商:microchip technology 系列:- 零件状态:在售 存储器类型:非易失 存储器格式:EEPROM 技术:EEPROM 存储容量:512Kb （64K x 8） 时钟频率:400kHz 写周期时间 - 字，页:5ms 访问时间:900ns 存储器接口:I2C 电压 - 电源:1.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C（TA） 标准包装:5,000 |
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