参数资料
型号: XR16C850CJ-F
厂商: Exar Corporation
文件页数: 14/56页
文件大小: 0K
描述: IC UART FIFO 128B 44PLCC
标准包装: 27
特点: *
通道数: 1,UART
FIFO's: 128 字节
规程: RS485
电源电压: 2.97 V ~ 5.5 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: 44-LCC(J 形引线)
供应商设备封装: 44-PLCC(16.59x16.59)
包装: 管件
xr
XR16C850
REV. 2.3.1
2.97V TO 5.5V UART WITH 128-BYTE FIFO
21
2.20
Infrared Mode
The 850 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 15.
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 15.
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 logic 1 to the data bit stream. However, this is not true with some
infrared modules on the market which indicate a logic 0 by a light pulse. So the 850 has a provision to invert
the input polarity to accomodate this. In this case, the user can enable FCTR bit-2 to invert the incoming
infrared RX signal.
FIGURE 14. AUTO RS-485 HALF-DUPLEX CONTROL
D
RS-485 Transceiver
R
TX
OP1#/RS485
RX
T+
T-
R+
R-
850 UART
(0 = Transmit
1= Receive)
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