hello fellas,
i hope request under correct topic. have few arduino fio microcontrollers , attach them 7.4 v power source.
on official website (https://www.arduino.cc/en/main/arduinoboardfio) shows th following:
operating voltage 3.3 v
input voltage 3.35 -12 v
input voltage charge 3.7 - 7 v
yesterday tried connect 7.4 v battery bat + , - holes right behind lipo dock. fried microcontroller. after looking online, came across request:
http://forum.arduino.cc/index.php?topic=67160.0
it's 4 years old , doesn't come propper solution. don't need advice "just take 3.3 or 3.7 v battery". voltage converter unhandy application. bought fio expecting able cope 7.4 v is.
thank you, justus
i hope request under correct topic. have few arduino fio microcontrollers , attach them 7.4 v power source.
on official website (https://www.arduino.cc/en/main/arduinoboardfio) shows th following:
operating voltage 3.3 v
input voltage 3.35 -12 v
input voltage charge 3.7 - 7 v
yesterday tried connect 7.4 v battery bat + , - holes right behind lipo dock. fried microcontroller. after looking online, came across request:
http://forum.arduino.cc/index.php?topic=67160.0
it's 4 years old , doesn't come propper solution. don't need advice "just take 3.3 or 3.7 v battery". voltage converter unhandy application. bought fio expecting able cope 7.4 v is.
thank you, justus
hello fellas,quote url posted ...
i hope request under correct topic. have few arduino fio microcontrollers , attach them 7.4 v power source.
on official website (https://www.arduino.cc/en/main/arduinoboardfio) shows th following:
operating voltage 3.3 v
input voltage 3.35 -12 v
input voltage charge 3.7 - 7 v
yesterday tried connect 7.4 v battery bat + , - holes right behind lipo dock. fried microcontroller. after looking online, came across request:
http://forum.arduino.cc/index.php?topic=67160.0
it's 4 years old , doesn't come propper solution. don't need advice "just take 3.3 or 3.7 v battery". voltage converter unhandy application. bought fio expecting able cope 7.4 v is.
thank you, justus
power
the arduino fio can powered ftdi cable or breakout board connected 6 pin headers (as marked on bottom side), or regulated 3.3v supply on 3v3 pin or lithium polymer battery on bat pins.
to me, states ...
a) or ... regulated 3.3v supply on 3v3
b) or ... or lithium polymer battery on bat pins
i not see states ok put 7.4 volts on bat +/- terminals.
then looked spec max1555 chip.
the max1555 has maximum input rating of 7 volts on pin 4.
pin 4 & ground attached jp6, labeled "usb vin" on schematic.
the max1555 supplies bat+ @ 4.2 volts on pin 5 (output) which...
a) charges li-ion battery
b) energizes u2, 3.3 volt voltage regulator, when on/off switch closed.
edit:
if "u2" on motherboard mic5219-3.3 can accept 12 volt input max.
but, not 100% sure max1555 can handle 12 volts on output pin 5?
but when on/off switch open ...
the power input pin of mic5129-3.3 disconnected
from 4.2 volt output pin 5 of max1555.
or there pad pin 5 needs cut isolate max1555 li-ion charging chip when power supply connected bat+ instead of li-ion battery?
are 100% sure didn't connect power supply voltage backwards?
is ptc smd fuse f1 still good?
this best can figure out.
i agree you, the input voltage specs confusing
also, schematics subject change without notice.
Arduino Forum > Using Arduino > Microcontrollers > Arduino Fio Power Supply
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