Pot and program selection pins max current ??

[gkaiomenos]

Hello!

I want to control the pot and program selection pins via a microcontroller / dac.
Do we know the maximum current these pins get?

[frank]

We never measured those specific parameters but the POT inputs are 10M minimum input impedance and the switch inputs are normal digital inputs so they will also be high input impedance. Basically shouldn't be an issue for any micro to drive them.

[gkaiomenos]

We never measured those specific parameters but the POT inputs are 10M minimum input impedance and the switch inputs are normal digital inputs so they will also be high input impedance. Basically shouldn't be an issue for any micro to drive them.

Thanks for the swift reply Frank!

At the moment I'm thinking of an unbuffered DAC with 1ma max drive current per output. Do you think it would be possible to drive these pins with no issues??

[frank]

Should be no problem, these things are normally in the microamp range.

You may want to check if the DAC requires a minimum load some do to operate properly so the input impedance may be too high and you need to add a load resistor.

[ice-nine]

You may need to check that the voltage is in range as well, if using a micro like the Arduino at 5v you will need to allow for 3.3v for S0-S2 and for the pot inputs you\may need to add PWM filtering.

[gkaiomenos]

Should be no problem, these things are normally in the microamp range.

You may want to check if the DAC requires a minimum load some do to operate properly so the input impedance may be too high and you need to add a load resistor.

You may need to check that the voltage is in range as well, if using a micro like the Arduino at 5v you will need to allow for 3.3v for S0-S2 and for the pot inputs you\may need to add PWM filtering.

Thanks again Frank!
It will be with an atmega running at 3.3V so I guess voltage range should be good.