Hi,
I have a Fairchild FL51x0 which has a control pin where the voltage at the pin is input to an 8 bit ADC with 2.5V reference. The pin sources 10uA current, so that an external resistor can be used to set the voltage (0-250k).
I'd like to use a Digital Potentiometer/Rheostat. However, the 250k ones are expensive and not in stock.
I was wondering if I could use a quad rheostat like the MCP4432 and wire in series with the DIM Control pin?
I can then control each channel to give me 0-300k and 129*3 taps.
Would that work? Because the DIM Control pin sources 10uA? 10uA through the 0-300k series digital rheostat would generate 0-3V, right?
I have a Fairchild FL51x0 which has a control pin where the voltage at the pin is input to an 8 bit ADC with 2.5V reference. The pin sources 10uA current, so that an external resistor can be used to set the voltage (0-250k).
I'd like to use a Digital Potentiometer/Rheostat. However, the 250k ones are expensive and not in stock.
I was wondering if I could use a quad rheostat like the MCP4432 and wire in series with the DIM Control pin?
I can then control each channel to give me 0-300k and 129*3 taps.
Would that work? Because the DIM Control pin sources 10uA? 10uA through the 0-300k series digital rheostat would generate 0-3V, right?