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参数资料
| 型号： | XR20V2170IL40-F |
| 厂商： | Exar Corporation |
| 文件页数： | 45/49页 |
| 文件大小： | 0K |
| 描述： | IC UART/TXRX I2C/SPI RS232 40QFN |
| 标准包装： | 490 |
| 特点： | * |
| 通道数： | 1，UART |
| FIFO's： | 64 字节 |
| 规程： | RS232 |
| 电源电压： | 2.97 V ~ 3.63 V |
| 带自动流量控制功能： | 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： | 40-VFQFN 裸露焊盘 |
| 供应商设备封装： | 40-QFN 裸露焊盘（6x6） |
| 包装： | 托盘 |
| 其它名称： | 1016-1478 XR20V2170IL40-F-ND |
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XR20V2170
5
REV. 1.0.1
I2C/SPI UART WITH 64-BYTE FIFO AND RS232 TRANSCEIVER
1.0 PRODUCT DESCRIPTION
The XR20V2170 (V2170) integrates a selectable I2C/SPI bus interface with an enhanced Universal
Asynchronous Receiver and Transmitter (UART) and an RS-232 Transceiver. The configuration register set is
16550 UART compatible for control, status and data transfer. Additionally, the V2170 has 64-bytes of transmit
and receive FIFOs, automatic RTS/CTS hardware flow control, automatic Xon/Xoff and special character
software flow control, programmable transmit and receive FIFO trigger levels, programmable fractional baud
rate generator with a prescaler of divide by 1 or 4, data rate up to 250 kbps, while meeting all EIA RS-232F
specifications. Additionally, the V2170 includes the ACP pin with which the user can shut down the charge
pump for the RS-232 drivers when the V2170 is already in sleep mode. The XR20V2170 is a 2.97V to 3.63V
device. The V2170 is fabricated with an advanced CMOS process.
Enhanced Features
The V2170 UART provides a solution that supports 64 bytes of transmit and receive FIFO memory, instead of
16 bytes in the industry standard 16C550. The V2170 is designed to work with low supply voltage and high
performance data communication systems, that require fast data processing time. Increased performance is
realized in the V2170 by the larger transmit and receive FIFOs, FIFO trigger level control and automatic flow
control mechanism. This allows the external processor to handle more networking tasks within a given time.
For example, the 16C550 with a 16 byte FIFO, unloads 16 bytes of receive data in 1.53 ms (This example uses
a character length of 11 bits, including start/stop bits at 115.2 Kbps). This means the external CPU will have to
service the receive FIFO at 1.53 ms intervals. However with the 64 byte FIFO in the V2170, the data buffer will
not require unloading/loading for 6.1 ms. This increases the service interval giving the external CPU additional
time for other applications and reducing the overall UART interrupt servicing time. In addition, the
programmable FIFO level trigger interrupt and automatic hardware/software flow control is uniquely provided
for maximum data throughput performance especially when operating in a multi-channel system. The
combination of the above greatly reduces the CPU’s bandwidth requirement, increases performance, and
reduces power consumption. Finally, since the V2170 includes an RS-232 transceiver and a full-modem
interface, it can be connected to an RS-232 serial cable directly.
Data Rate
The V2170 is capable of operation up to 250 Kbps data rate using the 16X, 8X or 4X internal sampling clock
rate. The UART section can operate at much higher speeds, but the speed of the RS-232 transceiver is limited
to 250Kbps beyond which the V2170 cannot comply with the EIA/TIA-232 electrical characteristics. The device
can operate either with a crystal on pins XTAL1 and XTAL2, or external clock source on XTAL1 pin.
RS-232 Interface
The V2170 includes RS-232 drivers/receivers for the modem interface. This feature eliminates the need for an
external RS-232 transceiver. The charge pump provides output voltages of +5V and -5V for its drivers over the
2.97V to 3.63V power supply voltage range. The serial outputs TXD swing between -5V (inactive) and +5V
(active) RS-232 voltage levels. The serial inputs RXD are RS-232 receivers and can take any voltage swing
from -15V to +15V. The receivers are always active, even in Sleep mode. The RS-232 drivers guarantee a data
rate of 250 Kbps even when fully loaded with 3Kohm in parallel with 1000pF load.
All RS-232 drivers and receivers are protected to ±15kV using the Human Body Model ground combination,
±8kV using IEC 61000-4-2 Contact Discharge, and ±15kV using IEC 61000-4-2 Air-Gap Discharge. For more
information, send an e-mail to uarttechsupport@exar.com.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| XR20V2170L40-0A-EB | 功能描述:界面开发工具 Supports V2170 40pin QFN,I2C Interface RoHS:否 制造商:Bourns 产品:Evaluation Boards 类型:RS-485 工具用于评估:ADM3485E 接口类型:RS-485 工作电源电压:3.3 V |
| XR20V2170L40-0B-EB | 功能描述:UART 接口集成电路 Supports V2170 40pin QFN,SPI Interface 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 |
| XR20V2172 | 制造商:EXAR 制造商全称:EXAR 功能描述:TWO CHANNEL I2C/SPI UART WITH 64-BYTE FIFO AND RS232 TRANSCEIVER |
| XR20V2172_08 | 制造商:EXAR 制造商全称:EXAR 功能描述:TWO CHANNEL I2C/SPI UART WITH 64-BYTE FIFO AND RS232 TRANSCEIVER |
| XR20V2172IL64 | 制造商:EXAR 制造商全称:EXAR 功能描述:TWO CHANNEL I2C/SPI UART WITH 64-BYTE FIFO AND RS232 TRANSCEIVER |
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