参数资料
型号: XR16V2550ILTR-F
厂商: Exar Corporation
文件页数: 10/46页
文件大小: 0K
描述: IC UART FIFO 16B DUAL 32QFN
标准包装: 3,000
特点: *
通道数: 2,DUART
FIFO's: 16 字节
规程: RS232,RS422
电源电压: 2.25 V ~ 3.6 V
带自动流量控制功能:
带IrDA 编码器/解码器:
带故障启动位检测功能:
带调制解调器控制功能:
带CMOS:
安装类型: 表面贴装
封装/外壳: 32-VFQFN 裸露焊盘
供应商设备封装: 32-QFN 裸露焊盘(5x5)
包装: 带卷 (TR)
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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