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GPIO Lower Output Voltage (1.8V) required

Question asked by Michael Hart on May 30, 2017

Hello, I'm trying to connect the STM32F0Discovery board to a device that accepts a maximum of 2.5V, but outputs at 1.8V. I would like to know if it's possible to output at 1.8V on the GPIO using software only - I can solder transistors and a separate power line, but this is work I'd like to avoid. I would simply use DAC except that I need this for 8-16 pins.

 

I thought it might be possible to use the DAC to output 1.8V, then somehow route it through any GPIO pins on setting the bit, and clearing back to 0. Can this be done?

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