Re: interfacing 8051 with adc

On 9 Jan 2007 17:54:25 -0800, "gautham" <gautham01986@xxxxxxxxx>
wrote:

well,to be more specific,the data input to the microcontroller comes
from a 220v, 50Hz power line,representing the power flow,voltage
etc.this analog data is interfaced with the microcontroller with an
adc.the frequency of the signal being less,any frequency on the upward
of 1MHz would work very fine.the resolution that i want is in the order
of a few hundred millivolt.therefore,i am planning to use a 14 bit
adc.my question is regarding the hardware interfacing of this adc with
the microcontroller. for example,how do i tune the microcontroller to
the frequency of the adc?would the results be accurate?the rf segment
is to connect the microcontrolller wireless to a remote host computer,
where detailed analysis of the data would be done.

The first step is to select an ADC that suits your task, and is easy
to interface. I've used ADCs and DACs that communicate with the 8051
using SPI bus. I did the SPI communications using "manual
bit-banging", but there may be some 8051 (or other micro) versions
with a SPI interface.

Depending on the accuracy you need, you may want a voltage reference
IC to provide the reference voltage for the ADC - but some ADCs have
an internal reference.


.

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