Hi,
I've got a circuit that needs a negative voltage reference, basically no current draw. Is there a way to control the V- pin on the SN75C3221? We basically have two modes of operation in our circuit; 1 requires the RS-232 interface, the other needs a fixed negative voltage reference into a high impedance source. Is there a way that I can know ahead of time (without measuring with a DVM) what the voltage on the V- pin will be?
Thanks,
Jim