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ADS1231REF Evaluation Module

Boris Milikic
Prodigy 10 points
Other Parts Discussed in Thread: ADS1231REF

Hi!

I'm not sure if this is the right form for my question about power supply.

I've been using ADS1231REF module as basic weigh-scale system for my Raspberry pi project. It sends data to a cloud where they are analyzed and displayed.  

http://www.ti.com/tool/ADS1231REF?keyMatch=ads1231ref

To apply power to the ADS1x31REF, I plugged in a 6V–9V ac wall adapter.

Unfortunatly my ac adapter has a replaceable tip/sleeve. And by accident I left a reversed power source connected for longer than a few seconds.


From datasheet:
AC adapters must be tip positive/sleeve negative. When an ac adapter is plugged in, the board always
takes power from it, and not from the battery.The ADS1x31REF is protected against polarity reversal. If a power source is connected in reverse by mistake, the display remains blank. To prevent damage to the board, do not leave a reversed power source connected for longer than a few seconds.

Best regards

Boris

  • 0
    Guru 227245 points
    There are two types of polarity protection. A series diode or a parallel diode. A series diode simply blocks any current in the wrong direction. No matter how long it is applied. But it has some forward voltage drop which is not energy efficient.
    The parallel diode will short the supply inf reverse voltage is applied. No forward voltage drop on normal condition, but a huge current if polarity is wrong. If applied for too long, either the diode will melt or the supply will burn. Depends on the size off the diode and the power of the supply. Unless you have a smart supply that has soft-start/shortcut protection.

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