参数资料
| 型号： | XR16C864IQ-F |
| 厂商： | Exar Corporation |
| 文件页数： | 13/51页 |
| 文件大小： | 0K |
| 描述： | IC UART FIFO 128B QUAD 100QFP |
| 标准包装： | 66 |
| 特点： | * |
| 通道数： | 4，QUART |
| FIFO's： | 128 字节 |
| 规程： | RS232，RS485 |
| 电源电压： | 2.97 V ~ 5.5 V |
| 带自动流量控制功能： | 是 |
| 带IrDA 编码器/解码器： | 是 |
| 带故障启动位检测功能： | 是 |
| 带调制解调器控制功能： | 是 |
| 带CMOS： | 是 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 100-BQFP |
| 供应商设备封装： | 100-QFP（14x20） |
| 包装： | 托盘 |
| 其它名称： | 1016-1277 |
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XR16C864
20
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 2.2.0
2.19
Auto RS485 Half-duplex Control
The auto RS485 half-duplex direction control changes the behavior of the transmitter when enabled by FCTR
bit-3. By default, it de-asserts OP1#/RS485 (logic 1) output following the last stop bit of the last character that
has been transmitted. This helps in turning around the transceiver to receive the remote station’s response.
When the host is ready to transmit next polling data packet again, it only has to load data bytes to the transmit
FIFO. The transmitter automatically re-asserts OP1#/RS485 (logic 0) output prior to sending the data.
2.20
Infrared Mode
The 864 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 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, 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 11.
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 864 has a provision to invert
the input polarity to accomodate this. In this case, user can enable FCTR bit-2 to invert the input signal.
FIGURE 11. INFRARED TRANSMIT DATA ENCODING AND RECEIVE DATA DECODING
Character
Data Bits
S
ta
rt
S
to
p
0
1
Bit Time
1/16 Clock Delay
IRdecoder-1
RX Data
Receive
IR Pulse
(RX pin)
C h a ra cte r
D a ta B its
S
ta
rt
S
to
p
0
1
T X D a ta
T ra n sm it
IR P u lse
(T X P in )
B it T im e
1 /2 B it T im e
3 /1 6 B it T im e
IrE n co d e r-1
相关PDF资料 |
PDF描述 |
|---|---|
| XR16L2450IJ-F | IC UART FIFO 1B DUAL 44PLCC |
| XR16L2550IJ-F | IC UART FIFO 16B DUAL 44PLCC |
| XR16L2551IM-F | IC UART FIFO 16B DUAL 48TQFP |
| XR16L2552IJ-F | IC UART FIFO 16B DUAL 44PLCC |
| XR16L2750IJ-F | IC UART FIFO 64B DUAL 44PLCC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| XR16C864IQTR-F | 功能描述:UART 接口集成电路 UART RoHS:否 制造商:Texas Instruments 通道数量:2 数据速率:3 Mbps 电源电压-最大:3.6 V 电源电压-最小:2.7 V 电源电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:LQFP-48 封装:Reel |
| XR16C872 | 制造商:EXAR 制造商全称:EXAR 功能描述:DUAL UART WITH 1284 PARALLEL PORT AND PLUG-AND-PLAY CONTROLLER |
| XR16C872CQ | 制造商:EXAR 制造商全称:EXAR 功能描述:DUAL UART WITH 1284 PARALLEL PORT AND PLUG-AND-PLAY CONTROLLER |
| XR16C872IQ | 制造商:EXAR 制造商全称:EXAR 功能描述:DUAL UART WITH 1284 PARALLEL PORT AND PLUG-AND-PLAY CONTROLLER |
| XR16L2450 | 制造商:EXAR 制造商全称:EXAR 功能描述:2.25V TO 5.5V DUART |
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