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參數(shù)資料
| 型號： | AT34C02 |
| 廠商： | Atmel Corp. |
| 元件分類： | DRAM |
| 英文描述： | 2K 2-wire Serial EEPROM with Permanent Software Write Protect(2K 2線串行EEPROM（帶永久軟件寫保護 ）) |
| 中文描述： | 2K 2線串行EEPROM與常駐軟件寫保護（2K 2線串行EEPROM的（帶永久軟件寫保護）） |
| 文件頁數(shù)： | 8/13頁 |
| 文件大小： | 242K |
| 代理商： | AT34C02 |
AT34C02
8
Figure 1.
Setting Write Protect Register
Read Operations
Read operations are initiated the same way as write opera-
tions with the exception that the read/write select bit in the
device address word is set to one. There are three read
operations: current address read, random address read
and sequential read.
CURRENT ADDRESS READ:
The internal data word
address counter maintains the last address accessed dur-
ing the last read or write operation, incremented by one.
This address stays valid between operations as long as the
chip power is maintained. The address
“
roll over
”
during
read is from the last byte of the last memory page to the
first byte of the first page.
Once the device address with the read/write select bit set to
one is clocked in and acknowledged by the EEPROM, the
current address data word is serially clocked out. To end
the command, the microcontroller does not respond with an
input zero but does generate a following stop condition
(refer to Figure 5).
RANDOM READ:
A random read requires a
“
dummy
”
byte
write sequence to load in the data word address. Once the
device address word and data word address are clocked in
and acknowledged by the EEPROM, the microcontroller
must generate another start condition. The microcontroller
now initiates a current address read by sending a device
address with the read/write select bit high. The EEPROM
acknowledges the device address and serially clocks out
the data word. To end the command, the microcontroller
does not respond with a zero but does generate a following
stop condition (refer to Figure 6).
WP Connected to GND or Floating
Start
R/W Bit
Write Protect Register
Acknowledgment
from Device
Action from Device
1010
R
X
ACK
Read Array
1010
W
Programmed
ACK
Can Write to Second Half (80H - FFH) Only
1010
W
Not Programmed
ACK
Can Write to Full Array
0110
R
Programmed
No ACK
Stop - Indicates Write Protect Register is Programmed
0110
R
Not Programmed
ACK
Read Out Data Don
’
t Care. Indicates WP Register is Not Prog
0110
W
Programmed
No ACK
Stop - Indicates Write Protect Register is Programmed
0110
W
Not Programmed
ACK
Program Write Protect Register (irreversible)
WP Connected to V
CC
1010
R
X
ACK
Read Array
1010
W
Programmed
ACK
Device Write Protect
1010
W
Not Programmed
ACK
Device Write Protect
0110
R
Programmed
No ACK
Stop - Indicates Write Protect Register is Programmed
0110
R
Not Programmed
ACK
Read Out Data Don
’
t Care. Indicates WP Register is Not Prog
0110
W
Programmed
No ACK
Stop - Indicates Write Protect Register is Programmed
0110
W
Not Programmed
ACK
Cannot Program Write Protect Register
S
T
A
R
T
S
T
O
P
SDA LINE
WORD
ADDRESS
DATA
CONTROL
BYTE
A
C
K
0 1 1 0
0
A
C
K
A
C
K
= Don't Care
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| AT34C02_07 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Two-wire Serial EEPROM with Permanent Software Write Protect |
| AT34C02-10PC | 功能描述:IC EEPROM 2KBIT 400KHZ 8DIP RoHS:否 類別:集成電路 (IC) >> 存儲器 系列:- 標準包裝:378 系列:- 格式 - 存儲器:閃存 存儲器類型:FLASH 存儲容量:8M（1M x 8，512K x 16） 速度:110ns 接口:并聯(lián) 電源電壓:2.7 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 封裝/外殼:48-CBGA 供應(yīng)商設(shè)備封裝:48-CBGA（7x7） 包裝:托盤 |
| AT34C02-10PC-1.8 | 功能描述:IC EEPROM 2KBIT 400KHZ 8DIP RoHS:否 類別:集成電路 (IC) >> 存儲器 系列:- 標準包裝:378 系列:- 格式 - 存儲器:閃存 存儲器類型:FLASH 存儲容量:8M（1M x 8，512K x 16） 速度:110ns 接口:并聯(lián) 電源電壓:2.7 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 封裝/外殼:48-CBGA 供應(yīng)商設(shè)備封裝:48-CBGA（7x7） 包裝:托盤 |
| AT34C02-10PC-2.7 | 功能描述:IC EEPROM 2KBIT 400KHZ 8DIP RoHS:否 類別:集成電路 (IC) >> 存儲器 系列:- 標準包裝:378 系列:- 格式 - 存儲器:閃存 存儲器類型:FLASH 存儲容量:8M（1M x 8，512K x 16） 速度:110ns 接口:并聯(lián) 電源電壓:2.7 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 封裝/外殼:48-CBGA 供應(yīng)商設(shè)備封裝:48-CBGA（7x7） 包裝:托盤 |
| AT34C02-10PI | 功能描述:IC EEPROM 2KBIT 400KHZ 8DIP RoHS:否 類別:集成電路 (IC) >> 存儲器 系列:- 標準包裝:378 系列:- 格式 - 存儲器:閃存 存儲器類型:FLASH 存儲容量:8M（1M x 8，512K x 16） 速度:110ns 接口:并聯(lián) 電源電壓:2.7 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 封裝/外殼:48-CBGA 供應(yīng)商設(shè)備封裝:48-CBGA（7x7） 包裝:托盤 |
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