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| 型號： | 34RC02 |
| 元件分類： | EEPROM |
| 英文描述： | The CAT24FC02 is a 2-kb Serial CMOS EEPROM internally organized as 256 words of 8 bits each |
| 中文描述： | 該CAT24FC02是一個2 KB的EEPROM的國內(nèi)256個8位每字舉辦的串行CMOS |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 445K |
| 代理商： | 34RC02 |
CAT34RC02
5
Doc No. 1052, Rev. K
I2C BUS PROTOCOL
The I2C bus consists of two ‘wires’, SCL and SDA. The
two ‘wires’ are connected to the supply (VCC) via pull-up
resistors. Master and Slave devices connect to the bus
via their respective SCL and SDA pins. The transmitting
device pulls down the SDA line to ‘transmit’ a ‘0’ and
releases it to ‘transmit’ a ‘1’.
(1) Data transfer may be initiated only when the bus is
not busy (see A.C. Characteristics).
(2) During a data transfer, the data line must remain
stable whenever the SCL line is high. An SDA
transition while SCL is high will be interpreted as a
START or STOP condition.
START Condition
The START Condition precedes all commands. It consists
of a HIGH to LOW transition on SDA while SCL is HIGH.
The START condition acts as a ‘wake-up’ call for the
Slave devices. A Slave will not respond to commands
unless the MASTER generates a START condition.
STOP Condition
The STOP condition completes all commands. It consists
of a LOW to HIGH transition on SDA while SCL is HIGH.
The STOP condition starts the internal write cycle, when
following a WRITE command and sends the Slave into
standby mode, when following a READ command.
Device Addressing
The Master initiates a data transfer by creating a START
condition on the bus. The Master then broadcasts an 8-
bit serial Slave address. The four most significant bits of
the Slave address (the ‘preamble’) are fixed to 1010
(Ah), for normal read/write operations and 0110 (6h) for
Software Write Protect (SWP) operations (Fig. 5). The
next three bits, A2, A1 and A0, select one of eight possible
Slave devices. The last bit, R/
W, specifies whether a
Read (1) or Write (0) operation is to be performed.
Acknowledge
After processing the Slave address, the Slave responds
with an acknowledge (ACK) by pulling down the SDA
line during the 9th clock cycle. The Slave will aslo
acknowledge the 8-bit byte address and every data byte
presented in WRITE mode. In READ mode the Slave
shifts out eight bits of data, and then ‘releases’ the SDA
line durng the 9th clock cycle. If the Master acknowledges
in the 9th clock cycle (by pulling down the SDA line), then
the Slave continues transmitting. When data transfer is
complete, the Master responds with a NoACK (it does
not acknowledge the last data byte) and the Slave stops
transmitting and waits for a STOP condition.
Figure 4. Acknowledge Timing
Figure 5. Slave Address Bits
ACKNOWLEDGE
1
START
SCL FROM
MASTER
89
DATA OUTPUT
FROM TRANSMITTER
DATA OUTPUT
FROM RECEIVER
1
DEVICE ADDRESS
010
A2
A1
A0
R/W
0
110
A2
A1
A0
R/W
Normal Read and Write
Programming the Write
Protect Register
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| 34RC02JE | 功能描述:電可擦除可編程只讀存儲器 2kb 1.7-5.5V Ext I2C RoHS:否 制造商:Atmel 存儲容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| 34RC02JE-TE13 | 功能描述:電可擦除可編程只讀存儲器 2kb 1.7-5.5V Ext I2C RoHS:否 制造商:Atmel 存儲容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| 34RC02JI | 功能描述:電可擦除可編程只讀存儲器 2kb 1.7-5.5V Ind I2C RoHS:否 制造商:Atmel 存儲容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| 34RC02JI-TE13 | 功能描述:電可擦除可編程只讀存儲器 2kb 1.7-5.5V Ind I2C RoHS:否 制造商:Atmel 存儲容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| 34RC02PE | 功能描述:電可擦除可編程只讀存儲器 2kb 1.7-5.5V Ext I2C RoHS:否 制造商:Atmel 存儲容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 |
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