參數資料
| 型號： | USB2SERA10CFK |
| 廠商： | Freescale Semiconductor |
| 文件頁數： | 27/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | USB TO SERIAL BRIDGE |
| 標準包裝： | 490 |
| 特點： | USB 至 UART |
| 通道數： | 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 |
| 供應商設備封裝： | 24-QFN 裸露焊盤（5x5） |
| 包裝： | 托盤 |
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USB2SERA10 Data Sheet, Rev. 2
Functional Description
Freescale Semiconductor
8
Serial number string — Version 1.0
Each USB peripheral requires a unique VID/PID combination. Vendor IDs are assigned by the USB-IF. It is possible to us the
factory VID/PID combination, only if the Product strings are not modified. In case that the strings are changed, it is necessary
to get a different VID/PID combination.
Freescale, as a member of the USB-IF, owns a Vendor ID and manages a database of Product IDs to be used in association with
the VID. If a customer of Freescale’s USB-enabled products is unable to procure their own VID, apply to use Freescale’s VID
in association with an assigned PID.
In case the device loses power in the middle of a descriptors configuration process, the default parameters will be loaded to
ensure that the part remains functional in all cases. If this happens, the password to protect the device from further modifications
will also be reset to the default value which is “FFFFFFFFFFFFFFFF”
2
Functional Description
The USB2SER is a USB2.0 Full Speed (12Mb/s) to the UART (RS232 or RS485) converter. This device integrates an on-chip
Full Speed USB 2.0 compatible transceiver, the USB serial interface engine, and an on-chip 3.3 V voltage regulator to a UART
communication.
2.1
Crystal frequency auto-detection
The USB2SER supports 2MHz, 4MHz, 6MHz, 8MHz, 12MH, and 16MHz external crystals connected in a Pierce Oscillator
Configuration.
Figure 6. Pierce Oscillator
2.2
Operating errors
In case there is an error with the USB2SER, the device will generate a 2-bit gray sequence using the UART_LED and
USB_LED
. The following are the possible errors and the device expected behavior:
For a PLL issue (crystal outside the operating range) the gray sequence changes every 60 ms
For a USB issue the sequence changes every 200 ms
2.3
RS232 connections
Figure shows the recommended connections to an RS232 transceiver. When interfacing to an RS485 transceiver, the
RS485_TXEN controls the transmitter enable signal.
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