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" />
參數(shù)資料
型號: XR16C850IMTR-F
廠商: Exar Corporation
文件頁數(shù): 14/56頁
文件大?。?/td> 0K
描述: IC UART FIFO 128B 48TQFP
標(biāo)準(zhǔn)包裝: 1,500
特點(diǎn): *
通道數(shù): 1,UART
FIFO's: 128 字節(jié)
規(guī)程: RS485
電源電壓: 2.97 V ~ 5.5 V
帶自動流量控制功能:
帶IrDA 編碼器/解碼器:
帶故障啟動位檢測功能:
帶調(diào)制解調(diào)器控制功能:
帶CMOS:
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: 帶卷 (TR)
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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