Comments (1)
glitchcore
commented on July 28, 2024
Pullup resistor on USB D+ is not needed: both old and new MCUs have a programmable internal pullup. In fact, this resistor will break enumeration if USB driver is not active because it makes host think that the device is present and ready to work.
thnx, I will try to remove it
BAT_LVL voltage divider consumes a lot of current (about 100uA), it's better to increase resistor values.
in general, I don't like this batt level measuring, in next version we will use PMIC with fuel gauge/coulomb counter
iButton contact is not protected from ESD, it's better to install protection diodes to prevent this line from going outside the 0..3.3V interval.
yes, we add protection in F2B0C1.1 board
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