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参数资料
| 型号： | CAT24C21PE |
| 元件分类： | PROM |
| 英文描述： | 128 X 8 I2C/2-WIRE SERIAL EEPROM, PDIP8 |
| 封装： | PLASTIC, DIP-8 |
| 文件页数： | 8/12页 |
| 文件大小： | 65K |
| 代理商： | CAT24C21PE |
CAT24C21
5
Doc. No. 1032, Rev. N
BI-DIRECTIONAL MODE (DDC2)
The following defines the features of the I2C bus protocol
in bi-directional mode (Figure 4):
(1) Data transfer may be initiated only when the bus is
not busy.
(2) During a data transfer, the data line must remain
stable whenever the clock line is high. Any changes
in the data line while the clock line is high will be
interpreted as a START or STOP condition.
When in the bi-directional mode, all inputs to the VCLK
pin are ignored, except when a logic high is required to
enable write capability.
START Condition
The START condition (Figure 6) precedes all commands
to the device, and is defined as a HIGH to LOW transition
of SDA when SCL is HIGH. The CAT24C21 monitors the
SDA and SCL lines and will not respond until this
condition is met.
STOP Condition
A LOW to HIGH transition of SDA when SCL is HIGH
determines the STOP condition. All operations must end
with a STOP condition.
Device Addressing
The bus Master begins a transmission by sending a
START condition. The Master then sends the address
of the particular slave device it is requesting. The four
most significant bits of the 8-bit slave address are fixed
as 1010 for the CAT24C21 (see Fig. 8). The next three
significant bits are "don't care". The last bit of the slave
address specifies whether a Read or Write operation is
to be performed. When this bit is set to 1, a Read
operation is selected, and when set to 0, a Write operation
is selected.
After the Master sends a START condition and the slave
address byte, the CAT24C21 monitors the bus and
responds with an acknowledge (on the SDA line) when
its address matches the transmitted slave address. The
CAT24C21 then performs a Read or Write operation
depending on the state of the R/
W bit.
Figure 3. Transmit-only Mode
SCL
SDA
VCLK
SCL must remain high for transmit-only mode
Bit8
(MSB)
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
(LSB)
Don't
Care
Bit8
Bit7
TVHIGH
TVLOW
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相关代理商/技术参数 |
参数描述 |
|---|---|
| CAT24C21WGI | 制造商:Rochester Electronics LLC 功能描述: 制造商:Catalyst Semiconductor 功能描述: |
| CAT24C21WGI-T3 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Catalyst Semiconductor 功能描述: |
| CAT24C21WI | 功能描述:电可擦除可编程只读存储器 1K Dual Mode Serial RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 |
| CAT24C21WI-G | 制造商:Rochester Electronics LLC 功能描述: 制造商:ON Semiconductor 功能描述: |
| CAT24C21WI-GT3 | 功能描述:电可擦除可编程只读存储器 1K DUAL MODE SER 电可擦除可编程只读存储器 RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 |
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