参数资料
型号: XR19L222IL64-F
厂商: Exar Corporation
文件页数: 15/53页
文件大小: 0K
描述: IC UART/TXRX RS232 64QFN
标准包装: 260
特点: *
通道数: 2,DUART
FIFO's: 64 字节
规程: RS232
电源电压: 3.3 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: 64-VFQFN 裸露焊盘
供应商设备封装: 64-QFN(9x9)
包装: 托盘
XR19L222
22
TWO CHANNEL INTEGRATED UART AND RS-232 TRANSCEIVER
REV. 1.0.1
2.19
Infrared Mode (UART Channel B Only)
The L222 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 12 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 12.
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 L222 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 L222 using the TXB output and the RXB input pins..
FIGURE 12. INTERNAL LOOP BACK
TXA/
TXB
RXA/
RXB
Mod
e
m
/G
eneral
Purp
ose
Co
ntro
l
L
ogic
In
te
rn
al
Da
ta
Bus
L
in
e
s
and
Co
ntro
l
S
ignals
RTSA#/
RTSB#
MCR bit-4=1
VCC
Transmit Shift Register
(THR/FIFO)
Receive Shift Register
(RHR/FIFO)
CTSA#/
CTSB#
DTRA#/
DTRB#
DSRA#/
DSRB#
RIA#/
RIB#
CDA#/
CDB#
OP1#
RTS
CTS
DTR
DSR
RI
CD
VCC
OP2#
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