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| 型号： | MCP2140-I/SO |
| 厂商： | Microchip Technology |
| 文件页数： | 11/58页 |
| 文件大小： | 0K |
| 描述： | IC IRDA CONTROLLR DTE/DCE 18SOIC |
| 产品培训模块： | IrDA® Standard Protocol |
| 标准包装： | 42 |
| 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： | 18-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 18-SOIC |
| 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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2003 Microchip Technology Inc.
Preliminary
DS21790A-page 19
MCP2140
2.14.2
DISCOVERY MODE
Discovery mode allows the Primary device to deter-
mine the capabilities of the MCP2140 (Secondary
device). Discovery mode is entered once the MCP2140
(Secondary device) has sent a XID response to the Pri-
mary device and the Primary device has completed
sending the XIDs and a Broadcast ID. If this sequence
is not completed, a Primary and Secondary device can
stay in NDM indefinitely.
When the Primary device has something to do, it
initiates Discovery, which has two parts. They are:
Link initialization
Resource determination
The first step is for the Primary and Secondary devices
to determine, and then adjust to, each other’s hardware
capabilities. These capabilities are parameters like:
Data rate
Turnaround time
Number of packets without a response
How long to wait before disconnecting
Both the Primary and Secondary devices begin com-
munications at 9600 baud, the default baud rate. The
Primary device sends its parameters and the Second-
ary device responds with its parameters. For example,
if the Primary device supports all data rates up to
115.2 kbaud and the Secondary device only supports
9.6 kbaud, the link will be established at 9.6 kbaud.
Once the hardware parameters are established, the
Primary device must determine if the Secondary device
has the resources it requires. If the Primary device has
a job to print, it must know if it’s talking to a printer, and
not a modem or other device. This determination is
made using the Information Access Service (IAS). The
job of the Secondary device is to respond to IAS que-
ries made by the Primary device. The Primary device
must ask a series of questions like:
What is the name of your service?
What is the address of this service?
What are the capabilities of this device?
When all the Primary device’s questions are answered,
the Primary device can access the service provided by
the Secondary device.
During Discovery mode, the MCP2140 handles all
responses to the Primary device (see Figure 2-13)
without any communication with the Host Controller.
The Host Controller is inhibited by the CTS signal of the
MCP2140 from sending data to the MCP2140.
2.14.3
NORMAL CONNECT MODE (NCM)
Once discovery has been completed, the Primary
device and MCP2140 (Secondary device) can freely
exchange data.
The MCP2140 uses a hardware handshake to stop the
local serial port from sending data when the MCP2140
Host UART Receiving buffer is full..
Both the Primary device and the MCP2140 (Secondary
device) check to make sure that data packets are
received by the other without errors. Even when data is
not required to be sent, the Primary and Secondary
devices will still exchange packets to ensure that the
connection hasn’t, unexpectedly, been dropped. When
the Primary device has finished, it transmits the “close
link” command to the MCP2140 (Secondary device).
The MCP2140 will confirm the “close link” command
and both the Primary device and the MCP2140 (Sec-
ondary device) will revert to the NDM state.
It is the responsibility of the Host Controller program to
understand the meaning of the data received and how
the program should respond to it. It’s just as if the data
were being received by the Host Controller from a
UART.
2.14.3.1
Primary Device Notification
The MCP2140 identifies itself to the Primary device as
a modem.
However, the MCP2140 is not a modem, and the non-
data circuits are not handled in a modem fashion.
Note:
The MCP2140 is limited to a data rate of
9.6 kbaud.
Note:
Data loss will result if this hardware
handshake is not observed.
Note:
If the NCM mode is unexpectedly termi-
nated for any reason (including the Primary
device not issuing a close link command),
the MCP2140 will revert to the NDM state
approximately 10 seconds after the last
frame has been received.
Note:
The MCP2140 identifies itself as a modem
to ensure that it is identified as a serial
device with a limited amount of memory.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MCP2140-ISS | 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 |
| MCP2140T-I/SO | 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 |
| MCP2140T-I/SS | 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 |
| MCP2140T-IP | 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 |
| MCP2140T-ISO | 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 |
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