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USB已经成为连接PC的接口选择。所有现代PC上都有USB接口,它提供标准化的连接器,可以为外设提供5V电源,以及最多达100mA的电流。图1中的电路组合了Maxim公司(www．maxim-ic．
USB has become the interface to connect the PC. All modern PCs have a USB interface, which provides a standardized connector that provides 5V power for peripherals and up to 100mA. The circuit in Figure 1 combines Maxim Corporation (www.maxim-ic.com)