Hello,
Why is there a specific BAT- pin on this board? How is it interconnected to the GND pins ?
Thank you in advance.
Hello,
Why is there a specific BAT- pin on this board? How is it interconnected to the GND pins ?
Thank you in advance.
The schematic for the 32U4 Mini ULV is here: pololu.com/file/0J780/a-sta … ematic.pdf
As you can see, on this particular model BAT- is not directly connected to ground, but is part of the power supply transition feature.
Thanks for the link.
Is the role of Q2 to prevent damage in case of of a polarity inversion when connecting a battery?
Hello.
Yes, Q2 is part of reverse polarity protection circuit. Please note, the ULV version of the A-Star Mini uses a different reverse polarity protection circuit than what is found on the LV and SV versions. On the ULV version, a N-channel MOSFET is connected to BAT-, and on the LV and SV versions of the A-Star Mini, a P-channel MOSFET is connected to BAT+.
- Jeremy