From: Cristian Mitu <[email protected]> Reply-To: "[email protected]" <[email protected]> Date: Saturday, July 5, 2014 at 3:17 AM To: "[email protected]" <[email protected]> Subject: Re: [beagleboard] Analog voltage referance pin
> How much current should the LDO be able to carry considering that i am using > BBB. Not sure how to answer that because it depends on what circuit you are adding. Read the BBB SRM which defines how much current you can draw from the 5V pins on the P9 connector. Given that your circuit is related to the ADC, I cannot imagine that you would need more that 250mA so most LDO will work for your requirement. Remember to use proper supply decoupling and filtering because any noise on the ADC circuits will cause your measurements to be inconsistent. Regards, John > > > Regards, > Cristian > > > 2014-07-05 4:02 GMT+02:00 John Syn <[email protected]>: >> >> From: Cristian Mitu <[email protected]> >> Reply-To: "[email protected]" <[email protected]> >> Date: Friday, July 4, 2014 at 2:38 PM >> To: "[email protected]" <[email protected]> >> Subject: [beagleboard] Analog voltage referance pin >> >>> Hello guys, >>> >>> >>> I have noticed that my BeagleBoneBlack has a VDD_ADC that is supposed to be >>> a 1.8V reference voltage. On the board that i am making i have some >>> components that need 1.8V(among which some simple protection circuits for >>> the Analog inputs). I was thinking that instead of using an LOD for >>> conversion i could draw directly from that pin to power those components. Is >>> this a viable solution or is there a problem or drawback if i use the 1.8V >>> reference voltage pin ? Thank you in advance for your responses. >> It is a reference pin, not a power pin, so no you cannot draw current for >> your other circuits. A small LDO regulator is inexpensive so just add one. >> >> Regards, >> John >>> >>> >>> -- >>> For more options, visit http://beagleboard.org/discuss >>> --- >>> You received this message because you are subscribed to the Google Groups >>> "BeagleBoard" group. >>> To unsubscribe from this group and stop receiving emails from it, send an >>> email to [email protected]. >>> >>> For more options, visit https://groups.google.com/d/optout. >> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to a topic in the Google >> Groups "BeagleBoard" group. >> To unsubscribe from this topic, visit >> https://groups.google.com/d/topic/beagleboard/CCsy0Sc5UjQ/unsubscribe. >> To unsubscribe from this group and all its topics, send an email to >> [email protected]. >> For more options, visit https://groups.google.com/d/optout. > > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
