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Netduino Plus 2


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#1 Bernd

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Posted 25 November 2012 - 06:54 PM

Hello, I would like to buy the Netduino Plus 2. But I saw that the maximum Voltage on the barrel jacket ist up to 9V. The netduino plus has 12V. How can I supply it over the battery ? I would like to use Baby size. So I need 7 cells (7x1.2 =8.4V). Can I use this or is where a danger with overvoltage because the batteries have voltage fluctuations. Has anybody expierence with this ?

#2 carb

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Posted 25 November 2012 - 07:20 PM

Hello,

I would like to buy the Netduino Plus 2. But I saw that the maximum Voltage on the barrel jacket ist up to 9V. The netduino plus has 12V. How can I supply it over the battery ? I would like to use Baby size. So I need 7 cells (7x1.2 =8.4V). Can I use this or is where a danger with overvoltage because the batteries have voltage fluctuations. Has anybody expierence with this ?

Bernd,

The Netduino Plus 2 can use 12vdc to the barrel connector, but using 9vdc reduces the power that the regulator must dump. This is not a problem if the current through the regulator is reasonable, but if you are near maximum current draw for the regulator you can overheat it. At 9vdc the temperature will be less for a given current.

This question was answered here on one of the thread if you want more detail.

Chuck

#3 Bernd

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Posted 25 November 2012 - 08:11 PM

Ok thanks Chuck for the answer. I search this topic on the forum but I didn't found it. Ok so I think I can supply the Netduino P2 directly with 7 akku cells, because the current I need from the NP2 is low.

#4 carb

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Posted 25 November 2012 - 08:28 PM

Ok thanks Chuck for the answer. I search this topic on the forum but I didn't found it. Ok so I think I can supply the Netduino P2 directly with 7 akku cells, because the current I need from the NP2 is low.


Bernd,

I found it, finally, it was in "Introducing Netduino Plus 2 The next generation of Netduino Plus" on page 3.

Netduino Plus 2 is actually designed to support 7.5V-12V still. So if you have a 12V DC power supply...you're still good to go :)

Why the silkscreen change? When you add up the power usage of the microcontroller, Ethernet, MicroSD, and a shield or two...the 5V LDO power regulator may not be able to deliver enough power when it's dropping 58% of all energy as heat (12V to 5V).

At 9V, the DC-DC switch can supply 680mA of 3.3V power to the system, giving you lots of power to run the board and shields.

And no worries...we oversized the USB/VIN power switchover circuitry to handle 12VDC as well. So as long as you understand that you'll get a lot of waste heat you're fine with 12V power.

Chris

Chuck




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