I would like to design the power supply for my BBB. The primary power source is a battery and therefore not constant - depending on load/remaining charge/hooked up to power supply etc…
The task is to measure the primary voltage and to supply the board from it. The support will be achieved by a constant output 5V piece.
The Voltage supervision must only work between 8-15V - therefore I introduce a voltage splitter to bring it down to 1.8 V (or let’s say 1.5 to be on the safe side). Since there can voltage ripple up to 20 V I want to protect the ADC and put a Z-Diode in scheme.
Now the questions come:
- Would you design it accordingly or do I miss something important?
- I couldn’t find any values on the current drain of the AIN - I kind of need that value to scale the resistors.
- Is the Z-Diode fast enough or do I need to introduce some “inertia” by butting a coil in front of AIN?
Thank you already in advance for some inside