I have had great difficulty getting various MAX3232's to work reliably on 3 ..
3.6V. The datasheet shows the capacitor values you need to use for various
voltage ranges... but no joy. The DC-DC converter does not produce the proper
output voltages. Check the V- and V+ nodes for around +/- 6V
Oddly, MAX232A's seem to work just fine on 3.3V... I usually use 0.47 uF caps
on them. I don't use the non -A versions for the MAX232.
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