Hello all,
I am currently working with the ESW427 dev board from Softbaugh (has the
MSP430fw427 chip on it...no ADC). In order to get value from an analog
input; I can hook up an external ADC to one of it's i/o's correct?
If
so, is there one you recommend; anyone have notes/files related to this?
Thanks and have a Happy Easter
Interfacing MSP with external ADC
Started by ●April 1, 2010
Reply by ●April 1, 20102010-04-01
You can use the comparator also as an ADC. It all depends on your
requirements though (speed, accuracy). Google "adc using comparator" and
you'll find many tutorials on how to implement it.
The basic idea is to connect a capacitor to a comparator input and time
how long it takes for the comparator to change state. Using this time
you can calculate what the input voltage is.
Regards,
Hans
On Thu, 1 Apr 2010 09:22:06 -0500
"Brock" wrote:
> Hello all,
> I am currently working with the ESW427 dev board from Softbaugh (has the
> MSP430fw427 chip on it...no ADC). In order to get value from an analog
> input; I can hook up an external ADC to one of it's i/o's correct? If
> so, is there one you recommend; anyone have notes/files related to this?
>
> Thanks and have a Happy Easter
>
>
>
requirements though (speed, accuracy). Google "adc using comparator" and
you'll find many tutorials on how to implement it.
The basic idea is to connect a capacitor to a comparator input and time
how long it takes for the comparator to change state. Using this time
you can calculate what the input voltage is.
Regards,
Hans
On Thu, 1 Apr 2010 09:22:06 -0500
"Brock" wrote:
> Hello all,
> I am currently working with the ESW427 dev board from Softbaugh (has the
> MSP430fw427 chip on it...no ADC). In order to get value from an analog
> input; I can hook up an external ADC to one of it's i/o's correct? If
> so, is there one you recommend; anyone have notes/files related to this?
>
> Thanks and have a Happy Easter
>
>
>
Reply by ●April 1, 20102010-04-01
On 01/04/2010 15:22, Brock wrote:
> Hello all,
> I am currently working with the ESW427 dev board from Softbaugh (has the
> MSP430fw427 chip on it...no ADC). In order to get value from an analog
> input; I can hook up an external ADC to one of it's i/o's correct? If
> so, is there one you recommend; anyone have notes/files related to this?
How many bits? TI makes a nice 16-bit sigma-delta ADC in a tiny package,
the ADS1110. I got one with my last Farnell order to make up the minimum
order amount but haven't used it yet.
Leon
--
Leon Heller
G1HSM
> Hello all,
> I am currently working with the ESW427 dev board from Softbaugh (has the
> MSP430fw427 chip on it...no ADC). In order to get value from an analog
> input; I can hook up an external ADC to one of it's i/o's correct? If
> so, is there one you recommend; anyone have notes/files related to this?
How many bits? TI makes a nice 16-bit sigma-delta ADC in a tiny package,
the ADS1110. I got one with my last Farnell order to make up the minimum
order amount but haven't used it yet.
Leon
--
Leon Heller
G1HSM
