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參數(shù)資料
| 型號： | XR21V1412IL32-F |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 4/32頁 |
| 文件大小： | 0K |
| 描述： | IC UART FIFO USB DUAL 32QFN |
| 產(chǎn)品培訓(xùn)模塊： | UART Product Overview XR21V141x Full-Speed USB UART Family |
| 特色產(chǎn)品： | XR21V141x Full-Speed USB UART |
| 標(biāo)準(zhǔn)包裝： | 490 |
| 特點： | * |
| 通道數(shù)： | 2，DUART |
| FIFO's： | 128 字節(jié)，384 字節(jié) |
| 規(guī)程： | USB 2.0 |
| 電源電壓： | 2.97 V ~ 3.63 V |
| 帶自動流量控制功能： | 是 |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 32-VFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 32-QFN 裸露焊盤（5x5） |
| 包裝： | 托盤 |
| 配用： | 1016-1301-ND - EVAL BOARD FOR XR21V1412IL |
| 其它名稱： | 1016-1302 |
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XR21V1412
12
2-CH FULL-SPEED USB UART
REV. 1.3.0
1.5.7
Automatic XON/XOFF Software Flow Control
When software flow control is enabled, the V1412 compares the receive data characters with the programmed
Xon or Xoff characters. If the received character matches the programmed Xoff character, the V1412 will halt
transmission as soon as the current character has completed transmission. Data transmission is resumed
when a received character matches the Xon character.
Software flow control is enabled when
FLOW_CONTROL[2:0] = ’010’.
1.5.8
Auto RS-485 Half-Duplex Control
The Auto RS-485 Half-Duplex Control feature changes the behavior of the GPIO5/RTS#/RS485 pin when
enabled by the GPIO_MODE register bits 2-0. See ”Section 3.3.12, GPIO_MODE Register Description
(Read/Write)” on page 24. The FLOW_CONTROL register must also be set appropriately for use in multidrop
applications. See ”Section 3.3.6, FLOW_CONTROL Register Description (Read/Write)” on page 21. If
enabled, the transmitter automatically asserts the GPIO5/RTS#/RS485 output prior to sending the data. By
default, it de-asserts GPIO5/RTS#/RS485 following the last stop bit of the last character that has been
transmitted, but the RS485_DELAY register may be used to delay the deassertion. The polarity of the GPIO5/
RTS#/RS485 signal may also be modified using the GPIO_MODE register bit 3.
1.5.9
Multidrop Mode with address matching
The V1412 device has two address matching modes which are also set by the flow control register using
modes 3 and 4. These modes are intended for a multi-drop network application. In these modes, the
XON_CHAR register holds a unicast address and the XOFF_CHAR holds a multicast address. A unicast
address is used by a transmitting master to broadcast an address to all attached slave devices that is intended
for only one slave device. A multicast address is used to broadcast an address intended for more than one
recipient device. Each attached slave device should have a unique unicast address value stored in the
XON_CHAR register, while multiple slaves may have the same multicast adderss stored in the XOFF_CHAR
register. An address match occurs when an address byte (9th bit or parity bit is ’1’) is received that matches the
value stored in either the XON_CHAR or XOFF_CHAR register.
1.5.9.1
Receiver
If an address match occurs in either flow control mode 3 or 4, the address byte will not be loaded into the RX
FIFO, but all subsequent data bytes will be loaded into the RX FIFO. The UART Receiver will automatically be
disabled when an address byte is received that does not match the values in the XON_CHAR or XOFF_CHAR
register.
1.5.9.2
Transmitter
In flow control mode 3, the UART transmitter is always enabled, irrespective of the Rx address match. In flow
control mode 4, the UART transmitter will only be enabled if there is an Rx address match.
1.5.10
Programmable Turn-Around Delay
By default, the GPIO5/RTS#/RS485 pin will be de-asserted immediately after the stop bit of the last byte has
been shifted when auto RS-485 half-duplex control is enabled by the GPIO_MODE register. However, this
may not be ideal for systems where the signal needs to propagate over long cables. Therefore, the de-
assertion of GPIO5/RTS#/RS485 pin can be delayed from 1 to 15 bit times via the RS485_DELAY register to
allow for the data to reach distant UARTs.
1.5.11
Half-Duplex Mode
Half-duplex mode is enabled when FLOW_CONTROL[3] = 1. In this mode, the UART will ignore any data on
the RX input when the UART is transmitting data.
1.5.12
USB Suspend
All USB peripheral devices must support the USB suspend mode. Per USB standard, the V1412 device will
begin to enter the Suspend state if it does not detect any activity (including Start of Frame or SOF packets) on
its USB data lines for 3 ms. The device must then reduce power consumption from VBUS power within the
next 7 ms to the allowed limit of 2.5 mA for the suspended state. Note that in this context, the "device" is all
circuitry (including the V1412) that draws power from the host VBUS.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XR21V1412IL32TR-F | 功能描述:USB 接口集成電路 2 Chan FS USB UART w/ 256 Byte FIFO RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20 |
| XR21V1414 | 制造商:EXAR 制造商全稱:EXAR 功能描述:4-CH FULL-SPEED USB UART |
| XR21V1414_10 | 制造商:EXAR 制造商全稱:EXAR 功能描述:4-CH FULL-SPEED USB UART |
| XR21V1414IM-0A-EB | 功能描述:界面開發(fā)工具 Eval Board for XR21V1414IM48-F RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類型:RS-485 工具用于評估:ADM3485E 接口類型:RS-485 工作電源電壓:3.3 V |
| XR21V1414IM-0B-EB | 功能描述:界面開發(fā)工具 For XR21V1414 TQFP48 USB, RS232;No Cables RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類型:RS-485 工具用于評估:ADM3485E 接口類型:RS-485 工作電源電壓:3.3 V |
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