MSP430F413: How does it work without a external ADC?

Farid

Part Number: MSP430F413
Other Parts Discussed in Thread: MSP430F1111A

MSP430F413: How does it work with analog signal directly into it?

I have to use MSP430F413 to display analog signal on a LCD display, but it hasn't any ADC, and I will not use a external ADC.

The reason for this operation is to save power and reducing the current from 250uA to below 100uA.

The MSP430F413 has to read the analog input, linearize the signal and put it on a LCD displat.
How can I solve the problem without using a external ADC?

Farid

over 7 years ago

0 Danny F over 7 years ago

Genius 3850 points

The answer depends what you want to do with the analog signal.

0 Farid over 7 years ago in reply to Danny F

Intellectual 255 points

Thanks to the reply;
To show the analog value on a LCD display;

0 Danny F over 7 years ago in reply to Farid

Genius 3850 points

Depending on what kind of analog values you are talking about, the answer ranges from "easy" to "impossible".

0 Ilmars over 7 years ago

Guru 46710 points

Farid Orak said:
How can I solve the problem without using a external ADC?

Build one (slope ADC) using comparator+timer+resistor+capacitor.

0 Farid over 7 years ago in reply to Ilmars

Intellectual 255 points

Hi Ilmars;

Thanks for your answear; I have a strong feeling, that you are right. But it has to be tested.
If you can send me some guidance, diagram and code to get started med the task, I thank you many times.
Farid;

0 Andre Frantzke over 7 years ago in reply to Farid

TI__Expert 5490 points

Hi Farid,

please have a look at this application note: http://www.ti.com/lit/slaa129
It describes the implementation of a slope ADC using a MSP430F1111A and a MSP430F413.

Best regards,
Andre

0 Farid over 7 years ago in reply to Andre Frantzke

Intellectual 255 points

Dear Andre;
Thank you very much for the link: http://www.ti.com/lit/slaa129 . I have also been thinking in this area too, but wasn't sure about that.
Right now I am very certain, this is a correct solution in order to omit ADC.
Farid;

**Attention** This is a public forum

MSP low-power microcontrollers

MSP low-power microcontroller forum

MSP430F413: How does it work without a external ADC?