The title almost says it all. I am trying to understand how to connect the PowerBoost 1000C to a Arduino Pro Mini 3.3V and a single 5V powered open collector output sensor.
My initial thought is: Vs - Arduino Raw In (as it can handle 3.3-12V) GND - Arduino GND
5V - Sensor Power GND - Sensor Ground
For completeness (though slightly irrelevant, sensor output to Arduino Pro Mini input using internal pullup.
The question comes on the EN and LBO pins. The schematic shows both connected to Vbat. Vbat should range from 3.0/3.2V to 4.2V or so. But the Atmel 328P chips can only handle Vcc+0.5V on the input pins, or 3.3+0.5=3.8V. So the EN and LBO pins will be 0.4V higher than the micros absolute maximum rating. Do I have this correct? How do I connect the LBO and EN pins to a 3.3V chip?
P.S. I'm not sure whom to better answer this, the folks at the Adafruit site or here, so I did post in both places. Forgive me.