參數(shù)資料
型號(hào): MCP2140A-I/P
廠商: Microchip Technology
文件頁(yè)數(shù): 4/66頁(yè)
文件大?。?/td> 0K
描述: IC IRDA CONTROLLR DTE/DCE 18DIP
標(biāo)準(zhǔn)包裝: 25
控制器類型: IRDA 標(biāo)準(zhǔn)協(xié)議??刂破?br>
接口: UART
電源電壓: 3 V ~ 5.5 V
電流 - 電源: 2.2mA
工作溫度: -40°C ~ 125°C
安裝類型: 通孔
封裝/外殼: 18-DIP(0.300",7.62mm)
供應(yīng)商設(shè)備封裝: 18-PDIP
包裝: 管件
產(chǎn)品目錄頁(yè)面: 685 (CN2011-ZH PDF)
配用: MCP2140DM-TMPSNS-ND - BOARD DEMO FOR MCP2140
MCP2140A
DS22050B-page 12
2007-2011 Microchip Technology Inc.
2.5
Encoder/Decoder
The encoder converts the UART format data into the
IrDA standard format data and the decoder converts
IrDA standard format data into UART format data.
2.5.1
ENCODER (MODULATION)
The data that the MCP2140A UART received (on the
TX pin) that needs to be transmitted (on the TXIR pin)
is modulated. This modulated signal drives the IR
transceiver module. Figure 2-6 shows the encoding of
the modulated signal.
Each bit time is comprised of 16-bit clocks. If the value
to be transmitted (as determined by the TX pin) is a
logic-low, the TXIR pin will output a low level for 7-bit
clock cycles, a logic high level for 3-bit clock cycles or
a minimum of 1.6 s (see Parameter IR121). The
remaining 6-bit clock cycles will be low. If the value to
transmit is a logic-high, the TXIR pin will output a low
level for the entire 16-bit clock cycles.
FIGURE 2-6:
ENCODING
Note:
The signal on the TXIR pin does not actu-
ally line up in time with the bit value that
was transmitted on the TX pin, as shown
in Figure 2-6. The TX bit value is shown to
represent the value to be transmitted on
the TXIR pin.
BITCLK
TX Bit
TXIR
01
0
1
16 CLK
7 CLK
Start Bit
Data bit 0
Data bit 1
Data bit 2
Data bit ...
12 Tosc
Value
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