How to get the correct data from ADC ?

jimltlee

Hi,there are some issue that I can't understand, and need some suggestion -->
well,I am trying to utilize the ADC10464(10 bit) as the ADC converter, but ,in·IC’s datasheet,
it outputs data by 10 pins,so,it means I have to use 10 basic stamp I/O pin to grap the data at 1 time ??
Is there any method to reduce the needed I/O pin to grap the data ?···
By the way, should I use the command “SHIFTIN” to read the 0/1data from the BASIC’s I/O pin ??···

rgs
Jim

stamptrol

Jim,

That ADC is designed for parallel output, as you have found.

One solution is to use a serial ADC like the LTC1298 which can send data to the stamp on a serial link.

Second, keep your existing converter and use a multiplexer between it and the stamp to allow you to let one stamp pin sense the parallel bits one at a time. You will still tie up 3 or 4 other bits for addressing and chip-select.

Cheers,

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Tom Sisk

http://www.siskconsult.com
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jimltlee

Tom,

thanks so much,it seems that I choose the in-correct ADC,

well, I need to proceed 3 channel ADC,·so,·maybe,I can also try to use

3 piece IC:ADC0831 (1 I/O port)·, or (1 ADC0831 + 1 LTC1298.)

multiplexer is also a good method~ thanks again

rgs

Jim··

Newzed

I would suggest that yiu switch to a TLC2543.· It is 11-channel 12-bit ADC but you can use just the inputs you need.· I think you will find that the chips with fewer inputs are a bit high in price,· The TLC is the lowest cost per channel ADC that I know of, and is very easy to communicate with.· I have used it for a long time.

Sid

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Chris Savage

Hello,

The MAX1270 has 8 channels at 12-bits each on one chip. It may cost a little more but would simplify code and reduce I/O pin consumption. Take care.

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Chris Savage
Parallax Tech Support