参数资料
型号: MCP2140A-I/P
厂商: Microchip Technology
文件页数: 5/66页
文件大小: 0K
描述: IC IRDA CONTROLLR DTE/DCE 18DIP
标准包装: 25
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: 通孔
封装/外壳: 18-DIP(0.300",7.62mm)
供应商设备封装: 18-PDIP
包装: 管件
产品目录页面: 685 (CN2011-ZH PDF)
配用: MCP2140DM-TMPSNS-ND - BOARD DEMO FOR MCP2140
2007-2011 Microchip Technology Inc.
DS22050B-page 13
MCP2140A
2.5.2
DECODER (DEMODULATION)
The modulated signal (data) from the IR transceiver
module (on the RXIR pin) is demodulated to form the
received data (on the RX pin). Once demodulation of
the data byte occurs, the data that is received is trans-
mitted by the MCP2140A UART (on the RX pin).
Figure 2-7 shows the decoding of the modulated
signal.
Each bit time is comprised of 16-bit clocks. If the value
to be received is a logic-low, the RXIR pin will be a low
level for the first 3-bit clock cycles, or a minimum of
1.6 s. The remaining 13-bit clock cycles (or difference
up to the 16-bit clock time) will be high. If the value to
be received is a logic-high, the RXIR pin will be a high
level for the entire 16-bit clock cycles. The level on the
RX pin will be in the appropriate state for the entire 16
clock cycles.
2.6
IR Port Baud Rate
The baud rate for the MCP2140A IR port (the TXIR and
RXIR pins) is fixed at the default rate of 9600 baud. The
primary device will be informed of this parameter during
NDM. The host UART baud rate and the IR port baud
rate are the same.
FIGURE 2-7:
DECODING
Note:
The signal on the RX pin does not actually
line up in time with the bit value that was
received on the RXIR pin, as shown in
Figure 2-7. The RXIR bit value is shown to
represent the value to be transmitted on
the RX pin.
BITCLK
RX
RXIR Bit Value
01
0
1
1.6 s (up to 3 CLK)
13 CLK
16 CLK
Start Bit
Data bit 0
Data bit 1
Data bit 2
Data bit ...
(CLK)
RXPD
RXPDREF
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