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參數(shù)資料
| 型號： | USB2SERA10CFK |
| 廠商： | Freescale Semiconductor |
| 文件頁數(shù)： | 26/28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(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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Pins and Connections
USB2SERA10 Data Sheet, Rev. 2
Freescale Semiconductor
7
must fall between 3.9 V and 5.0 V for the internal 3.3 V regulator to operate correctly. The USB2SER uses the VUSB33MON
pin to detect VDD used and configure the device accordingly.
1.6
Reset and system initialization
The USB2SER has three reset sources:
Power-on Reset (POR)
External Reset Pin (RESET)
Software update Reset (Soft Reset)
System startup from any reset source starts with the crystal frequency auto-detection that takes 48 ms. After this step, the device
initializes the internal PLL to setup the internal clock to 48 MHz which will be used as the reference for the USB and UART to
work properly.
After reset from a source different than a POR, the VUSB33MON is configured to discharge the capacitors connected
to the VUSB33 voltage when working from a 5V power supply; this adds a 40msec delay to the system startup to
determine if the internal voltage regulator has to be enabled.
Figure 5. Clock and system initialization
1.7
VID and PID configuration
The USB2SER includes the functionality to modify the VID, PID, Product Description Strings and Power Descriptor Value.
The default parameters are:
VID — 15A2 Hex
PID — 005A Hex
Power Descriptor Value for 100 mA
Manufacturer string — FREESCALE SEMICONDUCTOR INC.
Product string — USB TO SERIAL
RESET
Is Reset a POR
Wait for
VUSB33
Capacitors
discharge
550ms
Crystal
Autodetection
PLL Init
System Init
48msec
System
Ready
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