Vref on MSP430 F2013

N.Z. Guest 2009-04-08 15:03 #1222715

Hi everybody,
I’m currently working with an MSP430 F2013, and specifically with the AD 
Converter SD16_A.
From the Data sheet I can’t figure out what I should exactly do with the 
Pin P1.3 (VREF).
It is written that setting REFON brings me an internal reference voltage 
of 1.2V (why that low? With such a high resolution, it sounds a little 
bit low.)

Well, the main question is: can I use the P1.3 as an Input?

Or is the solution to switch continuously from Input / Reference Voltage 
using the SEL register while starting a conversion?
I have to utilize that I/O as an Input, and release an Interrupt each 
time it changes its state.
The recommended 100nF Cap would not have an influence in the Input 
operation.

Thank you for helping me out!

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Jörg S. Guest 2009-04-14 13:12 #1227985

>can I use the P1.3 as an Input?
Yes

>Or is the solution to switch continuously from Input / Reference Voltage
>using the SEL register while starting a conversion?
Should be possible.

>The recommended 100nF Cap would not have an influence in the Input
>operation.
But maybe the Noise on your Input may degrade the Ref-Voltage.

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