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Last Post 19 Feb 2014 04:54 PM by  Richard Hendricks
UART/TTL
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Nick Ryhajlo
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19 Feb 2014 10:25 AM

    I am attempting to communicate using the 1.8v UART pins (J33 pins 17 and 19) but I am having issues receiving data from other devices. The UARTB header which operates at RS232 levels works just fine, but the UARTB RX pin on J33 seems to be held high for some reason. Is there some way for me to use this pin?
    Richard Hendricks
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    19 Feb 2014 04:54 PM

    Nick,

      If you are planning to drive logic levels externally to the UART, you need to make sure you disable the on-board RS-232 transceiver U24.  You can do this by grounding nPWRDOWNB at J31.26.  Let us know if that doesn't work for you.
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