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參數(shù)資料
| 型號： | XR19L402IL48-F |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 13/49頁 |
| 文件大小： | 0K |
| 描述： | IC UART/TXRX RS485 48QFN |
| 標(biāo)準(zhǔn)包裝： | 260 |
| 特點： | * |
| 通道數(shù)： | 2，DUART |
| FIFO's： | 64 字節(jié) |
| 規(guī)程： | RS485 |
| 電源電壓： | 3.3V，5V |
| 帶自動流量控制功能： | 是 |
| 帶IrDA 編碼器/解碼器： | 是 |
| 帶故障啟動位檢測功能： | 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-VFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 48-QFN-EP（7x7） |
| 包裝： | 托盤 |
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XR19L402
20
TWO CHANNEL INTEGRATED UART AND RS-485 TRANSCEIVER
REV. 1.0.3
2.14
Infrared Mode (UART Channel B Only)
The L402 includes an 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, TXB, 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 RXB
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 L402 has a provision to
invert the input polarity to accommodate this. In this case user can enable FCTR bit-2 to invert the input signal.
The Infrared Mode can only be used with channel B of the L402 using the TXB output and the RXB input pins.
FIGURE 11. INFRARED TRANSMIT DATA ENCODING AND RECEIVE DATA DECODING
Character
Data Bits
Start
Stop
00
0
11
1
11
Bit Time
1/16 Clock Delay
IRdecoder-1
RX Data
Receive
IR Pulse
(RX pin)
C haracter
D a ta B its
Sta
rt
Stop
00
0
11
1
T X D a ta
T ransm it
IR P u lse
(T X Pin )
Bit Tim e
1/2 B it T im e
3/16 B it T im e
IrE ncoder-1
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