Co-Processor pins are only ADC (analog input) or also usable as DAC (analog output)?

balenaFin
1

Hi,
the co-processor connector features 8x GPIO/ADC pins.
Can those pins also used as DAC, meaning as a analog output? If yes, 3.3V or 5V?

Background, we are using currently the PWM pins of the RPI. I would like to get those free (one occupied pin is required for I2S/audio output).

Thanks
Chris

3

Hello Chris,
DAC is supported on the co-processor connector, however it’s IDAC, i.e. converts to a constant current (range 0.05 μA and 64 μA) rather than a voltage, so may not be suitable for your needs (at least without changes). Here’s the datascheet: https://www.silabs.com/documents/public/data-sheets/BGM111_datasheet.pdf#unique_2
Regards,
Scott