參數資料
型號: XR17V252IM-F
廠商: Exar Corporation
文件頁數: 26/69頁
文件大?。?/td> 0K
描述: IC UART PCI BUS DUAL 100TQFP
標準包裝: 90
特點: *
通道數: 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:
帶IrDA 編碼器/解碼器:
帶故障啟動位檢測功能:
帶調制解調器控制功能:
安裝類型: 表面貼裝
封裝/外殼: 100-TQFP
供應商設備封裝: 100-TQFP(14x14)
包裝: 托盤
XR17V252
32
66 MHZ PCI BUS DUAL UART WITH POWER MANAGEMENT SUPPORT
REV. 1.0.2
4.3
Infrared Mode
Each UART in the V252 includes the infrared encoder and decoder compatible to the IrDA (Infrared Data
Association) version 1.0. The input pin ENIR conveniently activates both UART channels to start up in the
infrared mode. This global control pin enables the MCR bit [6] function in every UART channel register. After
power up or a reset, the software can overwrite MCR bit [6] if so desired. ENIR and MCR bit [6] also disable its
receiver while the transmitter is sending data. This prevents the echoed data from going to the receiver. The
global activation ENIR pin prevents the infrared emitter from turning on and drawing large amount of current
while the system is starting up. When the infrared feature is enabled, the transmit data outputs, TX[7:0], would
idle at logic 0 level. Likewise, the RX [7:0] inputs assume an idle level of logic 0.
The infrared encoder sends out a 3/16 of a bit wide pulse for each “LOW” bit in the transmit data stream. This
signal encoding reduces the on-time of the infrared LED, hence reduces the power consumption. See
below.
The infrared decoder receives the input pulse from the infrared sensing diode on RX pin. Each time the
decoder senses a light pulse, it returns a LOW to the data bit stream. The RX input signal may be inverted prior
delivered to the input of the decoder via internal register setting. This option supports active LOW instead of
normal active HIGH pulse from some infrared modules on the market.
FIGURE 13. INFRARED TRANSMIT DATA ENCODING AND RECEIVE DATA DECODING
Character
Data Bits
Start
Stop
00
0
11
1
Bit Time
1/16 Clock Delay
IRdecoder-
RX Data
Receive
IR Pulse
(RX pin)
Character
Data Bits
Sta
rt
Stop
00
0
11
1
TX Data
Transmit
IR Pulse
(TX Pin)
Bit Time
1/2 Bit Time
3/16 Bit Time
IrEncoder-1
相關PDF資料
PDF描述
MS3110E14-15S CONN RCPT 15POS WALL MNT W/SCKT
SCC2692AE1B44,557 IC UART DUAL W/FIFO 44PLCC
MS27467T13B4P CONN PLUG 4POS STRAIGHT W/PINS
MS27484T16F26S CONN PLUG 26POS STRAIGHT W/SCKT
SC26C92C1A,512 IC UART DUAL W/FIFO 44-PLCC
相關代理商/技術參數
參數描述
XR17V252IMTR-F 制造商:Exar Corporation 功能描述:UART 2-CH 64Byte FIFO 3.3V 100-Pin TQFP T/R 制造商:Exar Corporation 功能描述:XR17V252IMTR-F
XR17V254 制造商:EXAR 制造商全稱:EXAR 功能描述:66MHZ PCI BUS QUAD UART WITH POWER MANAGEMENT SUPPORT
XR17V254_08 制造商:EXAR 制造商全稱:EXAR 功能描述:66MHZ PCI BUS QUAD UART WITH POWER MANAGEMENT SUPPORT
XR17V254IV 制造商:EXAR 制造商全稱:EXAR 功能描述:66MHZ PCI BUS QUAD UART WITH POWER MANAGEMENT SUPPORT
XR17V254IV-0A-EVB 功能描述:UART 接口集成電路 Supports V254 144 ld LQFP,PCI Interface RoHS:否 制造商:Texas Instruments 通道數量:2 數據速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel