Hi I am working on a small project with 3v and 5v arduino pro mini. The power source are 2x3v coin cell battery. Since I am using a trans receiver and a sensor, both the vcc pins are pre-occupied. Now I wanted to use RAW & GND pin to power it on. I just wanted to make sure that its ok and it should not cause any performance issue.
Thanks
The power source are 2x3v coin cell battery
So that is 6V, which is too high to apply directly to the processor. Also new coin cells are likely to be slightly higher than three volts which makes it worst.
Raw feeds the onboard regulator. Vcc is the output of the regulator.
Read the datasheet on the Promini regulator, see if 6V is enough to make 5V regulated out.
Are you getting enough current from coin cell? Those are generally pretty low output.
Grumpy_Mike:
So that is 6V, which is too high to apply directly to the processor. Also new coin cells are likely to be slightly higher than three volts which makes it worst.
Actually, I learned the hard way that a voltage of 3.0V on a lithium "coin" cell means it is flat. The nominal working voltage is 3.15.
Promini uses this 150mA regulator
Arduino-Pro-Mini_328-v11.pdf (41.7 KB)
@crossroads: Thanks for the explanation. So it seems like the voltage input range is 2.5 V ~ 16 V. I am still waiting for the battery holder to arrive so once I have them I will see how it goes. Thanks for your help.