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參數資料
| 型號： | FM24C32U |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | 32K-Bit Standard 2-Wire Bus Interface Serial EEPROM |
| 中文描述： | 32K的位標準2線總線接口的串行EEPROM |
| 文件頁數： | 11/13頁 |
| 文件大小： | 85K |
| 代理商： | FM24C32U |
11
www.fairchildsemi.com
FM24C32U Rev. A.1
F
S
T
O
P
A
C
K
NO
A
C
K
Bus Activity:
Master
SDA Line
0
1
Bus Activity:
EEPROM
A
C
K
A
C
K
WORD
ADDRESS (1)
WORD
ADDRESS (0)
SLAVE
ADDRESS
SLAVE
ADDRESS
DATA
A
C
K
S
T
A
R
T
S
T
A
R
T
S
T
O
P
A
C
K
Bus Activity:
Master
SDA Line
Bus Activity:
EEPROM
A
C
K
DATA n + x
A
C
K
DATA n + 2
DATA n +1
DATA n +1
A
C
K
NO
A
C
K
Slave
Address
Read Operations
Read operations are initiated in the same manner as write
operations, with the exception that the R/W bit of the slave
address is set to a one. There are three basic read operations:
current address read, random read, and sequential read.
Current Address Read
Internally the FM24C32U contains an address counter that
maintains the address of the last byte accessed, incremented by
one. Therefore, if the last access (either a read or write) was to
address n, the next read operation would access data from
address n + 1. Upon receipt of the slave address with R/W set to
"1," the FM24C32U issues an acknowledge and transmits the
eight bit word. The master will not acknowledge the transfer but
does generate a stop condition, and therefore the FM24C32U
discontinues transmission. Refer Figure 6 for the sequence of
address, acknowledge and data transfer.
Random Read
Random read operations allow the master to access any memory
location in a random manner. Prior to issuing the slave address
with the R/W bit set to "1," the master must first perform a
“
dummy
”
write operation. The master issues the start condition,
slave address with the R/W bit set to "0" and then the byte
address. After the byte address acknowledge, the master imme-
diately issues another start condition and the slave address with
the R/W bit set to one. This will be followed by an acknowledge
from the FM24C32U and then by the eight bit word. The master
will not acknowledge the transfer but does generate the stop
condition, and therefore the FM24C32U discontinues transmis-
sion. Refer Figure 7for the address, acknowledge, and data
transfer sequence.
Sequential Read
Sequential reads can be initiated as either a current address read
or random access read. The first word is transmitted in the same
manner as the other read modes; however, the master now
responds with an acknowledge, indicating it requires additional
data. The FM24C32U continues to output data for each acknowl-
edge received. The read operation is terminated by the master not
responding with an acknowledge or by generating a stop condi-
tion.
The data output is sequential with the data from address n
followed by the data from n + 1. The address counter for read
operations increments all word address bits, allowing the entire
memory contents to be serially read during one operation. After
the entire memory has been read, the counter "rolls over" to the
beginning of the memory. FM24C32U continues to output data for
each acknowledge received. Refer Figure 8for the address,
acknowledge, and data transfer sequence.
Low V
CC
WRITE Lockout
FM24C32U -
“
H
”
version offers low V
write lockout feature to
safeguard data whenever Vcc falls below 3.8V. Normally, the
operating V
CC
for FM24C32U
“
H
”
version is 5V. However during
system operation if the V
reaches below 3.8V, then internally all
write commands to the array are locked out.
S
T
O
P
DATA
A
C
K
NO
A
C
K
S
T
A
R
T
SLAVE
ADDRESS
Bus Activity:
Master
SDA Line
Bus Activity:
EEPROM
1 0 1 0 1
Current Address Read (Figure 6)
Random Read (Figure 7)
Sequential Read (Figure 8)
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相關代理商/技術參數 |
參數描述 |
|---|---|
| FM24C32UEM8 | 功能描述:電可擦除可編程只讀存儲器 USE 511-M24C32-MN6 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 |
| FM24C32UEM8X | 功能描述:電可擦除可編程只讀存儲器 DISC BY MFG 7/03 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 |
| FM24C32UEN | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| FM24C32UFEM8 | 功能描述:電可擦除可編程只讀存儲器 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 |
| FM24C32UFEM8X | 功能描述:電可擦除可編程只讀存儲器 DISC BY MFG 7/03 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 |
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