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| 型号： | MCP2140A-I/SS |
| 厂商： | Microchip Technology |
| 文件页数： | 8/66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 16
2007-2011 Microchip Technology Inc.
2.10
Buffers and Throughput
The IR data rate of the MCP2140A is fixed at
9.6 kbaud. The actual throughput will be less due to
several factors. Many significant factors are under the
control of the developer. One factor beyond the control
of the designer is the overhead associated with the
IrDA standard.
Depending on the application, throughput may be an
issue in one or both directions.
2.10.1
THROUGHPUT
Throughput is dependant on the direction that the data
is streaming and the characteristics of the primary
device and secondary device. Streaming throughput
from the secondary device may be different with differ-
ent primary devices. Also streaming throughput from
the secondary device may be different than streaming
throughput to the secondary device, with the same pri-
mary device. Throughput examples are shown in
Table 2-4. These examples are based on actual
observed data communications.
Figure 2-11 shows an example communications
sequence between a primary device and a secondary
device (MCP2140A). In this example, after the “Primary
Device Sends Open Link Frame”, the time for the sec-
ondary device’s response is fixed by the operation of
the MCP2140A. After the “Primary Device Decodes
Secondary Device Response” the “Primary Device
Responds to Secondary Device”. Throughput may be
improved if the application program can be written so
that the primary device response is fast as possible.
Also, when the “Secondary Device Sends Data”, the
frame should have the maximum number of data bytes.
Figure 2-12 shows the screen-capture of a host con-
troller (and MCP2140A) streaming (transmitting) 250
bytes to a primary device (PIC24 + IrDA Standard Stack
Library).
Figure 2-13 shows the screen-capture of a MCP2140A
(and host controller) receiving 250 streamed bytes from
a primary device (PIC24 + IrDA Standard Stack
Library).
Figure 2-14 shows a second screen-capture of a host
controller (and MCP2140A) streaming (transmitting)
250 bytes to a primary device (PDA HP IPAQ H2495B).
Figure 2-15 shows a second screen capture of a host
controller (and MCP2140A) streaming (transmitting)
250 bytes to a primary device (PDA HP IPAQ H2495B).
TABLE 2-4:
THROUGHPUT EXAMPLES - 250 BYTES (3)
FIGURE 2-10:
HOST UART RECEIVE BUFFER AND CTS WAVEFORM
Note:
IrDA throughput is based on many factors
associated with characteristics of the pri-
mary and secondary devices. These char-
acteristics may cause your throughput to
be more or less than is shown in Table 2-4.
Primary Device
Secondary
Device
Data
Streaming
Direction
250 Byte
Transmit Time
(ms) (1)
Effective
Baud Rate (2)
Comment
PC (6)
MCP2140A (5)
S -> P
354
7062
Note 7
MCP2140
S -> P
650 (7)
3692
PIC IrDA Standard Stack (4) MCP2140A (5)
S -> P
337
7418
PIC IrDA Standard Stack (4) MCP2140A (5)
P -> S
549
4553
PDA (HP iPAQ hx2495b)
MCP2140A (5)
S -> P
332
7530
Note 1:
Measured from Figure. (see comment)
2:
Interpolated from Figure. (see comment)
3:
10 bits transferred for each byte.
4:
Using the PIC24 Explorer 16 Development Board with IR Transceiver Board
5:
Using the MCP215X/40 Data Logger Demo Board and Board Firmware V1.4
6:
IBM 600X Thinkpad (notebook computer) running Windows XP Professional (SP1)
7:
MCP2140 Data Sheet, DS21790, Table 2-4, MCP2140 transmitted 240 bytes in this transmit time.
CTS
Receive Buffer Empty
MCP2140A Can Receive Data
Receive Buffer Has 59 Bytes,
Receive Buffer
Receive Buffer Empty
MCP2140A Can Receive Data
IR Data Packet Transmitted
Full (60 Bytes)
CTS Pin Driven High
IR Data Packet Starts Transmission
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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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