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Charlieplexing is a technique for driving a multiplexed display in which relatively few I/O pins on a microcontroller are used to drive an array of LEDs. The method uses the tri-state logic capabilities of microcontrollers in order to gain efficiency over traditional multiplexing. Although it is more efficient in its use of I/O, there are issues that cause it to be more complicated to design and render it impractical for larger displays. These issues include duty cycle, current requirements and the forward voltages of the LEDs.

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  • Charlieplexing
  • Charlieplexing
  • Charlieplexing
  • Чарлиплексинг
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  • Matrix-multiplexing met gereduceerd aantal parallelle geleiders of Charlieplexing is een wijze van schakelen, waarbij een matrix van leds met een minimum aantal parallelle geleiders wordt aangestuurd. De techniek is genoemd naar Charlie Allen, een voorvechter van het beginsel. Het hoofddoel is het verlagen van de productiekosten. Dit kan worden bereikt met een minimum aantal componenten met weinig pennen, die bovendien weinig montage-oppervlakte vragen. Na de komst van de goedkope microcontrollers is de relatief gecompliceerde besturing commercieel interessant geworden.
  • Charlieplexing is a technique for driving a multiplexed display in which relatively few I/O pins on a microcontroller are used to drive an array of LEDs. The method uses the tri-state logic capabilities of microcontrollers in order to gain efficiency over traditional multiplexing. Although it is more efficient in its use of I/O, there are issues that cause it to be more complicated to design and render it impractical for larger displays. These issues include duty cycle, current requirements and the forward voltages of the LEDs.
  • Charlieplexing é uma técnica para a condução de um display multiplexado em que relativamente poucos dos pinos de I/O num microcontrolador são usados para conduzir uma matriz de LEDs. O método utiliza as capacidades de lógica tri-state de microcontroladores, a fim de ganhar eficiência ao longo de multiplexação tradicional. Embora seja mais eficiente no uso de I/O, há questões que fazem com que seja mais complicado para projetar e torná-lo impraticável para telas maiores. Essas questões incluem ciclo de trabalho, as exigências atuais e as tensões frente dos LEDs.
  • Чарлиплексинг — конструкция светодиодной индикации, когда к каждой паре выводов микроконтроллера подключены два встречно-параллельных светодиода. Такая конструкция позволяет подключить много светодиодов к сравнительно небольшому количеству выводов микроконтроллера. Метод назван в честь Чарли Аллена из Maxim Integrated (1995). Хотя им пользовались и в 1980-х, и он описан в патенте AEG-Telefunken 1979 года под названием «трёхзначная сигнальная система».
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  • Matrix-multiplexing met gereduceerd aantal parallelle geleiders of Charlieplexing is een wijze van schakelen, waarbij een matrix van leds met een minimum aantal parallelle geleiders wordt aangestuurd. De techniek is genoemd naar Charlie Allen, een voorvechter van het beginsel. Het hoofddoel is het verlagen van de productiekosten. Dit kan worden bereikt met een minimum aantal componenten met weinig pennen, die bovendien weinig montage-oppervlakte vragen. Na de komst van de goedkope microcontrollers is de relatief gecompliceerde besturing commercieel interessant geworden.
  • Charlieplexing is a technique for driving a multiplexed display in which relatively few I/O pins on a microcontroller are used to drive an array of LEDs. The method uses the tri-state logic capabilities of microcontrollers in order to gain efficiency over traditional multiplexing. Although it is more efficient in its use of I/O, there are issues that cause it to be more complicated to design and render it impractical for larger displays. These issues include duty cycle, current requirements and the forward voltages of the LEDs.
  • Charlieplexing é uma técnica para a condução de um display multiplexado em que relativamente poucos dos pinos de I/O num microcontrolador são usados para conduzir uma matriz de LEDs. O método utiliza as capacidades de lógica tri-state de microcontroladores, a fim de ganhar eficiência ao longo de multiplexação tradicional. Embora seja mais eficiente no uso de I/O, há questões que fazem com que seja mais complicado para projetar e torná-lo impraticável para telas maiores. Essas questões incluem ciclo de trabalho, as exigências atuais e as tensões frente dos LEDs.
  • Чарлиплексинг — конструкция светодиодной индикации, когда к каждой паре выводов микроконтроллера подключены два встречно-параллельных светодиода. Такая конструкция позволяет подключить много светодиодов к сравнительно небольшому количеству выводов микроконтроллера. Этот метод пользуется тем, что цифровые выводы микроконтроллеров способны на трёхзначную логику: присоединён к питанию, присоединён к «земле» и не подсоединён ни к чему. Несмотря на эффективность, у этого метода есть и недостатки, не дающие использовать его на больших индикаторах: скважность, отказоустойчивость, требования к току и прямые напряжения светодиодов. Метод назван в честь Чарли Аллена из Maxim Integrated (1995). Хотя им пользовались и в 1980-х, и он описан в патенте AEG-Telefunken 1979 года под названием «трёхзначная сигнальная система».
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