Any USB/Ethernet controller suggestions?

[A_Camera]

do not use a 5V phone charger they are not all regulated to give you exactly 5V DC !!!

I think that's not the case any more. All phone chargers use regulated power today, but maybe not all gives 5V. Anyway, original Nokia, Samsung, Sony... all safe to use, but I'd be careful with the cheap eBay chargers.

[A_Camera]

That makes sense, but I'm sleightly confused about it not giving a max value for amps.

The maximum amp value never really matters, if you use a power supply with more amps output than needed it will still only output what you are using, and in this case hardly anything at all. In current the minimum amps is what's important, in voltage it is the exact voltage level, or the maximum, what matters. Maximum voltage matters because if you are using a power supply which gives more than 5V then it may fry your UC300/400.

So, if you have a power supply which provides 5V (maximum) and 500mA (minimum) then you are OK, but if you have one which gives you 5V and 25A then you are still OK, nothing bad happens.

[jtar40]

What do you mean when you say "regulated power" is this something I should be worried about when searching for a power supply? If so is there some way I can identify weather it's regulated or not?
LETOUR Power Supplies DC 5V Power Supply 30A 150Watts、AC96V~130V Transform DC 5Volt Switching Power with EMC Filter Overcurrent and Overvoltage Protection (Silver) https://www.amazon.ca/dp/B01HJA3OUG/..._d1n0CbVHAD6RM

I'm planning on buying this power supply above, but is there any specs that I should be cautious about that may be dangerous to my uc300eth-5lpt which requires an external 5vdc power supply (and a minimum of 0.5 amps)??? The power supply meets the 5 volt max, and has more than enough amps.

Thanks in advance, I truly appreciate it!!!


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[Clive S]

What do you mean when you say "regulated power" is this something I should be worried about when searching for a power supply? If so is there some way I can identify weather it's regulated or not?
LETOUR Power Supplies DC 5V Power Supply 30A 150Watts、AC96V~130V Transform DC 5Volt Switching Power with EMC Filter Overcurrent and Overvoltage Protection (Silver) https://www.amazon.ca/dp/B01HJA3OUG/..._d1n0CbVHAD6RM

I'm planning on buying this power supply above, but is there any specs that I should be cautious about that may be dangerous to my uc300eth-5lpt which requires an external 5vdc power supply (and a minimum of 0.5 amps)??? The power supply meets the 5 volt max, and has more than enough amps.

Thanks in advance, I truly appreciate it!!!


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That is a bit overkill, just a 2A power supply will do. Something like this https://www.powersuppliesonline.co.u...er-supply.html

or https://www.amazon.co.uk/Din-Rail-po.../dp/B00MWQEBAU

[Doddy]

As Clive says - a bit of overkill. In theory it should work, and the argument that the UC300ETH (or whatever) will only draw the current that it requires is correct, however, big PSUs like this are sometimes less well regulated when substantially under utilised. Chances are that it will work, but something closer to the requirement of the UC300ETH (and any BOB, limit switch, relays, etc) would be sensible. 2A would be my target for something like this.

[jtar40]

Thanks for the link and the feedback, it's helping a lot in this project. Now I've got a few phone power supplies too, but the one problem is that the one is out putting 5.1 volts rather than the " exact 5 volt maximum." Is that something that should worry me? I know it's sounding a bit picky But it never hurts to ask just in case.

Thanks again in advance!

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[john swift]

the extra 0.1V from your 5.1V power supply is not a problem

for 5V logic like the old 74series TTL logic
the limits for nominal 5V supply voltage is between the 4.75 min and 5.25V max

for 5V Atmel 8 bit micro controllers like the ATmega8 operating voltage is 4.5V to 5.5V

John

PS
any one know which micro controller has been used for the UC300ETH ?

[m_c]

As John says, that voltage sounds fine. It could even be your multimeter that's slightly out.


I would guess the UC300 is using some form of ARM chip, regardless I'd guess whatever chip will be running at 3.3V. Even a few years ago, the vast majority of microcontrollers were running at 3.3V max, with 5V capable ones being a dying breed.

[john swift]

m_c
your correct the micro controller is a 3.3V device


looking at a photo of the UC300 it has a
MICROCHIP dsPIC33EP256



from the MICROCHIP web site
Operating Voltage Range (V)
3 to 3.6

the dsPIC33EP256 Input/Output

• Sink/Source 10 mA on All Pins
• 5V Tolerant Pins
• Selectable Open-Drain, Pull-ups and Pull-Downs
• Up to 5 mA Overvoltage Clamp Current
• External Interrupts on All I/O pins

the UC300 board has a 5V supply connector
so the surface mount device between the 5V supply and PIC
must be a low drop out 3.3V regulator

John