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| 型号： | 24LC22A-I/P |
| 厂商： | Microchip Technology |
| 文件页数： | 4/24页 |
| 文件大小： | 0K |
| 描述： | IC EEPROM 2KBIT 400KHZ 8DIP |
| 产品培训模块： | I2C Serial EEPROM |
| 标准包装： | 60 |
| 格式 - 存储器： | EEPROMs - 串行 |
| 存储器类型： | EEPROM |
| 存储容量： | 2K (256 x 8) |
| 速度： | 100kHz，400kHz |
| 接口： | I²C，2 线串口 |
| 电源电压： | 2.5 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-PDIP |
| 包装： | 管件 |
| 其它名称： | 24LC22AI/P |
24LC22A
2.0 FUNCTIONAL DESCRIPTION
The 24LC22A is designed to comply to the DDC Stan-
dard proposed by VESA (Figure 3-3) with the exception
that it is not Access.bus capable. It operates in two
modes, the Transmit-Only mode (1 Kbit) and the
Bidirectional mode (2 Kbit). There is a separate 2-wire
protocol to support each mode, each having a separate
clock input but sharing a common data line (SDA). The
device enters the Transmit-Only mode upon power-up.
In this mode, the device transmits data bits on the SDA
pin in response to a clock signal on the VCLK pin. The
device will remain in this mode until a valid high-to-low
transition is placed on the SCL input. When a valid tran-
sition on SCL is recognized, the device will switch into
the Bidirectional mode and look for its control byte to be
sent by the master. If it detects its control byte, it will
stay in the Bidirectional mode. Otherwise, it will revert
to the Transmit-Only mode after it sees 128 VCLK
pulses.
2.1 Transmit-Only Mode
The device will power-up in the Transmit-Only mode at
address 00h. This mode supports a unidirectional
2-wire protocol for continuous transmission of the first
1 Kbit of the memory array. This device requires that it
be initialized prior to valid data being sent in the Trans-
mit-Only mode (Section 2.2). In this mode, data is
transmitted on the SDA pin in 8-bit bytes, with each
byte followed by a ninth, Null bit (Figure 2-1). The clock
source for the Transmit-Only mode is provided on the
VCLK pin, and a data bit is output on the rising edge on
this pin. The eight bits in each byte are transmitted
Most Significant bit first. Each byte within the memory
array will be output in sequence. After address 7Fh in
the memory array is transmitted, the internal Address
Pointers will wrap-around to the first memory location
(00h) and continue. The Bidirectional mode Clock
(SCL) pin must be held high for the device to remain in
the Transmit-Only mode.
2.2 Initialization Procedure
After V CC has stabilized, the device will be in the
Transmit-Only mode. Nine clock cycles on the VCLK
pin must be given to the device for it to perform internal
sychronization. During this period, the SDA pin will be
in a high-impedance state. On the rising edge of the
tenth clock cycle, the device will output the first valid
data bit which will be the Most Significant bit in address
00h. (Figure 2-2).
FIGURE 2-1:
SCL
TRANSMIT-ONLY MODE
SDA
T VAA
T VAA
Null Bit
Bit 1 (LSB)
VCLK
T VHIGH T VLOW
FIGURE 2-2:
DEVICE INITIALIZATION
Vcc
SCL
Bit 1 (MSB)
T VAA
Bit 7
T VAA
SDA
High-Impedance for 9 Clock Cycles
Bit 8
Bi t 7
T VPU
VCLK
1
2
8
9
10
11
DS21683B-page 4
? 2007 Microchip Technology Inc.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 24LC22AT-I/SN | 功能描述:电可擦除可编程只读存储器 VESA E-EDID 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 |
| 24LC22AT-I/SNG | 功能描述:电可擦除可编程只读存储器 VESA E-EDID Lead Free Package 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 |
| 24LC256-E/MF | 功能描述:电可擦除可编程只读存储器 32kx8 - 2.5V 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 |
| 24LC256E/MS | 制造商:Microchip Technology 功能描述:EEPROM Serial-I2C 256K-Bit 32K x 8 3.3V/5V 8-Pin MSOP Tube |
| 24LC256-E/MS | 功能描述:电可擦除可编程只读存储器 32kx8 - 2.5V 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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