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使用微控制器的AD转换器扩展数字输入的方法

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  • 上传时间:2021-10-31
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  • 标      签: 转换 AD 微控制器

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This application note documents a method of extending digital inputusing the analog-to-digital converter (ADC) of a microcontroller unit(MCU).Many MCU applications require digital input and arbitration. Forexample, determining which key of a keypad was pressed. This iscommonly done by arranging switches in a matrix configuration,connecting to a series of digital input pins, and reading a digital inputdata register to determine which key was pressed. While this method iseasily implemented, it does require the use of an MCU’s parallel portpins.
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