REV. 1.0.2 2.17 Infrared Mode The M2551 U" />
參數(shù)資料
型號(hào)： XR16M2551IL32TR-F
廠商： Exar Corporation
文件頁(yè)數(shù)： 13/51頁(yè)
文件大小： 0K
描述： IC UART FIFO 16B DUAL 32QFN
標(biāo)準(zhǔn)包裝： 3,000
特點(diǎn)： *
通道數(shù)： 2，DUART
FIFO's： 16 字節(jié)
規(guī)程： RS232，RS422
電源電壓： 1.62 V ~ 3.63 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
安裝類(lèi)型： 表面貼裝
封裝/外殼： 32-VFQFN 裸露焊盤(pán)
供應(yīng)商設(shè)備封裝： 32-QFN 裸露焊盤(pán)（5x5）
包裝： 帶卷 (TR)
XR16M2551
20
HIGH PERFORMANCE LOW VOLTAGE DUART WITH 16-BYTE FIFO AND POWERSAVE FEATURE
REV. 1.0.2
2.17
Infrared Mode
The M2551 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 M2551 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.
2.18
Sleep Mode with Wake-Up Indicator and PowerSave Feature
The M2551 supports low voltage system designs, hence, a sleep mode with auto wake-up and PowerSave
feature is included to reduce power consumption when the device is not actively used.
FIGURE 11. INFRARED TRANSMIT DATA ENCODING AND RECEIVE DATA DECODING
Character
Data Bits
Star
t
St
op
00
0
11
1
Bit Time
1/16 Clock Delay
IRdecoder-1
RX Data
Receive
IR Pulse
(RX pin)
Character
Data Bits
Sta
rt
St
op
00
0
11
1
TX Data
Transmit
IR Pulse
(TX Pin)
Bit Time
1/2 Bit Time
3/16 Bit Time
IrEncoder-1
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XR16M2551IM48 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述:
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