參數(shù)資料
型號(hào)： USB2SERA10CFK
廠商： Freescale Semiconductor
文件頁(yè)數(shù)： 28/28頁(yè)
文件大?。?/td> 0K
描述： USB TO SERIAL BRIDGE
標(biāo)準(zhǔn)包裝： 490
特點(diǎn)： USB 至 UART
通道數(shù)： 1，UART
FIFO's： 512 字節(jié)
規(guī)程： RS232，RS485，USB 2.0
電源電壓： 2.7 V ~ 5.5 V
帶自動(dòng)流量控制功能： 是
安裝類型： 表面貼裝
封裝/外殼： 24-VQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 24-QFN 裸露焊盤（5x5）
包裝： 托盤
Functional Description
USB2SERA10 Data Sheet, Rev. 2
Freescale Semiconductor
9
Figure 7. Example schematic using an RS232 transceiver
2.4
UART Baud rates
Baud rate is calculated by generating an internal divisor used to generate the clock for the UART communication module. The
following calculation is used to estimate the real baud rate that will be generated by the device:
Where
is the closest integer resulting from the division.
After reset the device is automatically configured to communicate at 115,200 bps which is the maximum allowed value.
2.5
Flow control operation
The device works as a standard Communication Device Class (CDC); to add flow control options to this class, the drivers are
installed in the operating system to enable this functionality.
When working without any flow control option, it is possible to generate an overflow condition, if the USB host does not request
for the data received through the serial interface fast enough. Using any flow control option (hardware or software) eliminates
the overflow possibility.
The following formula may be used to determine the amount of time without requesting data to generate the overflow condition:
BaudRate
24 000 000
Round
24 000 000
DesiredBaudrate
16
---------------------------------------------------------
16
---------------------------------------------------------------------------------------------
=
Round
24 000 000
24 000 000
DesiredBaudrate
16
---------------------------------------------------------
---------------------------------------------------------------
=
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