REV. 1.0.3 2.18 Infrared Mode The V2550 UART includes the infrared encoder " />
參數(shù)資料
型號(hào)： XR16V2550IM-F
廠商： Exar Corporation
文件頁(yè)數(shù)： 10/46頁(yè)
文件大?。?/td> 0K
描述： IC UART FIFO 16B 48TQFP
標(biāo)準(zhǔn)包裝： 250
特點(diǎn)： *
通道數(shù)： 2，DUART
FIFO's： 16 字節(jié)
規(guī)程： RS232，RS422
電源電壓： 2.25 V ~ 3.6 V
帶自動(dòng)流量控制功能： 是
帶IrDA 編碼器/解碼器： 是
帶故障啟動(dòng)位檢測(cè)功能： 是
帶調(diào)制解調(diào)器控制功能： 是
帶CMOS： 是
安裝類型： 表面貼裝
封裝/外殼： 48-TQFP
供應(yīng)商設(shè)備封裝： 48-TQFP（7x7）
包裝： 托盤
其它名稱： 1016-1464
1016-1464-ND
1016-1648
XR16V2550IM-F-ND
XR16V2550
18
HIGH PERFORMANCE DUART WITH 16-BYTE FIFO
REV. 1.0.3
2.18
Infrared Mode
The V2550 UART includes the infrared encoder and decoder compatible to the IrDA (Infrared Data
Association) version 1.0. The IrDA 1.0 standard that stipulates the infrared encoder sends out a 3/16 of a bit
wide HIGH-pulse for each “0” bit in the transmit data stream. This signal encoding reduces the on-time of the
infrared LED, hence reduces the power consumption. See Figure 11 below.
The infrared encoder and decoder are enabled by setting MCR register bit-6 to a ‘1’. When the infrared feature
is enabled, the transmit data output, TX, idles at logic zero level. Likewise, the RX input assumes an idle level
of logic zero from a reset and power up, see Figure 11.
Typically, the wireless infrared decoder receives the input pulse from the infrared sensing diode on the RX pin.
Each time it senses a light pulse, it returns a HIGH to the data bit stream. However, this is not true with some
infrared modules on the market which indicate a LOW by a light pulse. So the V2550 has a provision to invert
the input polarity to accommodate this. In this case user can enable MCR bit-2 to invert the input signal.
FIGURE 11. INFRARED TRANSMIT DATA ENCODING AND RECEIVE DATA DECODING
Character
Data Bits
Sta
rt
St
op
00
0
11
1
11
Bit Tim e
1/16 Clock Delay
IRdecoder-1
RX Data
Receive
IR Pulse
(RX pin)
Character
Data Bits
St
art
St
op
00
0
11
1
11
TX Data
Transm it
IR Pulse
(TX Pin)
Bit Tim e
1/2 Bit Tim e
3/16 Bit Tim e
IrEncoder-1
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
XR16V2550IMTR-F 制造商:Exar Corporation 功能描述:UART 2-CH 16Byte FIFO 2.5V/3.3V 48-Pin TQFP T/R 制造商:Exar Corporation 功能描述:XR16V2550IMTR-F
XR16V2551 制造商:EXAR 制造商全稱:EXAR 功能描述:HIGH PERFORMANCE DUART WITH 16-BYTE FIFO AND POWERSAVE FEATURE
XR16V2551_07 制造商:EXAR 制造商全稱:EXAR 功能描述:HIGH PERFORMANCE DUART WITH 16-BYTE FIFO AND POWERSAVE FEATURE
XR16V2551IL 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述:
XR16V2551IL-0B-EB 功能描述:UART 接口集成電路 Supports V2551 32pin QFN, PCI Interface RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel
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