ADC: различия между версиями
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The main channel have 12K/33K dividers. Thus the input voltage for each channel is 1.364 * <measured voltage> | The main channel have 12K/33K dividers. Thus the input voltage for each channel is 1.364 * <measured voltage> | ||
Some of the ADC channels share terminal blocks with FET. Please make sure you have | Some of the ADC channels share terminal blocks with FET. Please make sure you have explicitly closed the corresponding FET using GPIO before using ADC. | ||
=== Input voltage measuring === | === Input voltage measuring === | ||
Channel 5 of the multiplexer is dedicated to measuring input voltage. | Channel 5 of the multiplexer is dedicated to measuring input voltage. | ||
The channel has 200K/33K divider. Thus the input voltage is 7.061 * <measured voltage>. | The channel has 200K/33K divider. Thus the input voltage is 7.061 * <measured voltage>. | ||
Версия 23:03, 30 сентября 2013
Wiren Board has 8-channel ADC which are multiplexed using analog multiplexer into i.mx233 LRADC1 channel.
Main channels
7 channels are exposed to terminal blocks. See Hardware_Overview_rev._2.8#Terminal_blocks for details.
The main channel have 12K/33K dividers. Thus the input voltage for each channel is 1.364 * <measured voltage>
Some of the ADC channels share terminal blocks with FET. Please make sure you have explicitly closed the corresponding FET using GPIO before using ADC.
Input voltage measuring
Channel 5 of the multiplexer is dedicated to measuring input voltage. The channel has 200K/33K divider. Thus the input voltage is 7.061 * <measured voltage>.