purpose of BBB/BBGW AIN7 connection?

[David McRell]

Hello,

What is the purpose of the resistor divider connected to AIN7?  What software is dependent on this, if any?

Is this only a convenient connection to quickly test ADC functionality?  I find no mention of AIN7 here, e2e.ti.com or on the web that convincingly indicates otherwise.

I realize AIN requires 1V8 maximum, hence the divider given the 3V3 input.

I'd like to use AIN7 as general purpose ADC of thermistor.

Kind Regards,

David McRell

[Gerald Coley]

Use it for what ever you like. Just keep in mind it would void the warranty on the board.

 

Gerald

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[William Hermans]

It might be better to just use a pin multiplexer, then use AIN1-6. We did that for one of our projects, and it works great. Also keep in mind that this would not slow down reading from the ADC much, if at all. A simple "line select" with a GPIO based multiplexer could be really fast.

[William Hermans]

Sorry, AIN0-AIN6, but you got the idea already hopefully. And just to be clear, you would only need one pf the ADC lines, not all 7.

[David McRell]

Hello Gerald,

Thank you for your reply.  Not worried about warranty here.  Just checking for unknown dependencies.

David

On Fri, Jun 9, 2017 at 1:50 PM, Gerald Coley <gco...@emprodesign.com> wrote:

Use it for what ever you like. Just keep in mind it would void the warranty on the board.

 

Gerald

 

 

From: beagl...@googlegroups.com [mailto:beagleboard@googlegroups.com] On Behalf Of David McRell
Sent: Friday, June 9, 2017 1:47 PM
To: BeagleBoard <beagl...@googlegroups.com>
Subject: [beagleboard] purpose of BBB/BBGW AIN7 connection?

 

Hello,

 

What is the purpose of the resistor divider connected to AIN7?  What software is dependent on this, if any?

 

Is this only a convenient connection to quickly test ADC functionality?  I find no mention of AIN7 here, e2e.ti.com or on the web that convincingly indicates otherwise.

 

I realize AIN requires 1V8 maximum, hence the divider given the 3V3 input.

 

I'd like to use AIN7 as general purpose ADC of thermistor.

 

Kind Regards,

David McRell

 

 

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[David McRell]

Hello William,

Thank you for your reply.  I didn't even notice your 'typo' until you mentioned it. :)  Yeah, I understand what you are getting at.  Thankfully, all AIN pin are not far under Sitara, so adding another trace doesn't look too difficult.

David

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[Gerald Coley]

It was there to allow the SW to detect whethe or not the external LDO was working, something that never made it into the vault of SW features.

 

Gerald

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