Wiren Board 4:Аппаратная часть/en: различия между версиями

Wiren Board 4:Аппаратная часть/en (просмотреть исходный код)

20 байт убрано , 8 лет назад

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 Such outputs are called “open collectors”.
-Input stage of Ax channel consists of an analogue-to-digital converter ADCx and an input resistor Rx. Input resistance of the ADCx is high. It is always ON and does not affect the channel operation as it works in output mode. In input mode the Tx key is inactive (open) and, thus, does not affect voltage measuring at the channel terminals. Input resistance of the channel in input mode is formed by the Rx resistor. If no other circuits are connected to the channel terminals, the resistor downs the input voltage to zero, and the ADCx converter will read 0.
+Input stage of Ax channel consists of an analogue-to-digital converter ADCx and an input resistor Rx.
+The ADC has a high impedance, so it doesn't affect the channel operation even if the channel works as output.
+In input mode the Tx switch is inactive (open) and, thus, does not affect voltage measuring at the channel terminals. Input resistance of the channel in input mode is determined by the Rx resistance.
+If the channel terminal is left floating, the input voltage measured by ADCs is pulled down to zero by the Rx resistance.
 А4 and А5 support binary input function DI: more than 3V at the terminal is considered as triggering of the input.