One unfortunate thing about the DAC

Discussion created by lpcware Employee on Jun 15, 2016
Latest reply on Jun 18, 2016 by lpcware
Content originally posted in LPCWare by IanB on Sun Mar 27 09:04:51 MST 2016
In those few moments whilst the microprocessor is configuring its outputs, it the program has crashed, whilst programming and debugging, the DAC output isn't a DAC output, it's just a standard I/O; and that means it has a pull-up resistor.

There's a bit of a snag with this arrangement, that the analogue circuitry attached to the DAC output doesn't know this, and it thinks the DAC is set to full output.

Anyone know a good workaround? All I can think of doing is using 0V to mean "full output" and 3.3V to mean "off", but that's not so convenient for the analogue circuitry.