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| 型号： | MCP2140A-I/SS |
| 厂商： | Microchip Technology |
| 文件页数： | 48/66页 |
| 文件大小： | 0K |
| 描述： | IC IRDA CONTROLLR DTE/DCE 20SSOP |
| 标准包装： | 67 |
| 控制器类型： | IRDA 标准协议栈控制器 |
| 接口： | UART |
| 电源电压： | 3 V ~ 5.5 V |
| 电流 - 电源： | 2.2mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 20-SSOP |
| 包装： | 管件 |
| 产品目录页面： | 685 (CN2011-ZH PDF) |
| 配用： | MCP2140DM-TMPSNS-ND - BOARD DEMO FOR MCP2140 |
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MCP2140A
DS22050B-page 52
2007-2011 Microchip Technology Inc.
B.1
Normal Disconnect Mode (NDM)
When two IrDA standard compatible devices come into
range, they must first recognize each other. The basis
of this process is that one device has some task to
accomplish and the other device has a resource
needed to accomplish this task. One device is referred
to as a primary device and the other is referred to as a
secondary device. This distinction between primary
device and secondary device is important. It is the
responsibility of the primary device to provide the
mechanism to recognize other devices. So the primary
device must first poll for nearby IrDA standard compat-
ible devices. During this polling, the default baud rate of
9600 baud is used by both devices.
For example, if you want to print from an IrDA equipped
laptop to an IrDA printer, utilizing the IrDA standard fea-
ture, you would first bring your laptop in range of the
printer. In this case, the laptop is the one that has
something to do and the printer has the resource to do
it. The laptop is called the primary device (client) and
the printer is the secondary device (server). Some
data-capable cell phones have IrDA standard infrared
ports. If you used such a cell phone with a Personal
Digital Assistant (PDA), the PDA that supports the IrDA
standard feature would be the primary device and the
cell phone would be the secondary device.
When a primary device polls for another device, a
nearby secondary device may respond. When a sec-
ondary device responds, the two devices are defined to
be in the Normal Disconnect Mode (NDM) state. NDM
is established by the primary device broadcasting a
packet and waiting for a response. These broadcast
packets are numbered. Usually 6 or 8 packets are sent.
The first packet is number 0, the last packet is usually
number 5 or 7. Once all the packets are sent, the pri-
mary device sends an ID packet, which is not
numbered.
The secondary device waits for these packets and then
responds to one of the packets. The packet responds
to determines the “timeslot” to be used by the second-
ary device. For example, if the secondary device
responds after packet number 2, then the secondary
device will use timeslot 2. If the secondary device
responds after packet number 0, then the secondary
device will use timeslot 0. This mechanism allows the
primary device to recognize as many nearby devices
as there are timeslots. The primary device will continue
to generate timeslots and the secondary device should
continue to respond, even if there’s nothing to do.
During NDM, the MCP2140A handles all responses to
the primary device (Figure B-1) without any communi-
cation with the host controller. The host controller is
inhibited by the CTS signal of the MCP2140A from
sending data to the MCP2140A.
Note:
In the parlance of software development,
the primary device is called a client and
the secondary device is called a server.
Note 1: The MCP2140A can only be used to
implement a secondary device.
2: The MCP2140A supports a system with
only one secondary device having
exclusive use of the IrDA standard
infrared link (known as “point-to-point”
communication).
3: The MCP2140A always responds to
packet number 0. This means that the
MCP2140A will always use timeslot 0.
4: If another secondary device is nearby, the
primary device may fail to recognize the
MCP2140A, or the primary device may
not recognize either of the devices.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MCP2140AT-I/P | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:IrDA㈢ Standard Protocol Stack Controller With Fixed 9600 Baud Communication Rate |
| MCP2140AT-I/SO | 功能描述:网络控制器与处理器 IC Enhanced MCP2140 Win Mobile 5.0 compatble RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| MCP2140AT-I/SS | 功能描述:网络控制器与处理器 IC Enhanced MCP2140 Win Mobile 5.0 compatble RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| MCP2140DM-TMPSNS | 功能描述:温度传感器开发工具 MCP2140 IrDA Wire- less Temp Demo RoHS:否 制造商:Texas Instruments 产品类型:Temperature Sensors and Control ICs 工具用于评估:MSP430G2553 接口类型:USB 工作电源电压: 工作电源电流: |
| MCP2140-I/P | 功能描述:网络控制器与处理器 IC 9600bd fixd spd IrDA RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
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