ADC MAX197

Hi.
i am working on max197 that is a analog to digital converter from maxim company . it is connected to the micro controller ( pic18f452 ) through the 13 pins . I wrote the program according to the datasheet , but the max197 does not work and does not generate an interrupt .
schematic and source of program and the datasheet is attached.
Any help is appreciated.

Can you re upload via zip format or 7 zip please and ill see if i can help you

Also can you make sure pdf is in zip file as well as flowchart showing what youve done as well please


cheers

Mark

www.harrington.force9.co.uk

hi
this file is zip format.

Is your A/D clock pin really floating or is there a cap there to set the internnal clock rate like the data sheet indicates?

How fast is your while loop compared to the acquisition and conversion time of the A/D?

Hi Mr. Abolfazi,

Some general prcedures for Ato D:

As seen from the your Schematic of 18F452 & ADC197 the interrupt pin is 33.of 18F452.

Step1: When you trigger for a new conversion, ensure that WR pin of 18F452 goes low and return to high for a rising edge trigger.

Step2: See that the Interrupt pin (33) goes low.

Step3 : While Interrupt pin 33 of MCU is low , make the Read pin (16) goes low. This makes the data to be loaded to the data bus.

Step 4: Then you can read the data from the MCU.

Step 5: Then the read pin (16) should be brought to High for the next cycle to begin.


Please try to follw the steps and accordingly you may check up your program & let me know the progress !

Hope this may give you some insight. !!

KCPadhy,
For KCTRONICS Innovative COnsultancy Services Private Limited,
Contact No.9916133982
Tel/Fax: +91-80-25241189
E-mail:kanhupadhy@gmail.com

Yes in other words where is his Flow chart or algorithem This is why he cant get his code to work more importantly when it comes to debugging Its a headache becuase he hasent created a flow chart before coding

YOU CANNOT BEGIN TO ATTEMPT CODING ON EMBEDDED DEVICES UNLESS YOU CREATE A FLOW CHART

THIS IS STEP ONE IN ANY ANY SOFTWARE ENVIROMENT

if you create a flow chart you are 90% assured that you will get most applications to work from start Otherwise you wil be pulling you hair out trying to find out why it dosent work

The other subject that you want to look at is RTOS particularly if you are working with the 18f xxx series which uses 3timers

Here is the address for you where you can download and try this out as well

http://www.freertos.org/a00104.html

There are other versions available but worth looking into

Good habits die hard! !

Hi everyone
this file include flow chart and new schematic .
http://abolfazlk873.persiangig.com/document/max197.zip
I am running this program in higher frequency ( 10 MHz ) but doesn't sensing the interrupt .
My question came to me that it will generate an interrupt but the micro controller did not sense or did not generate an interrupts.
Thanks for your views

Appolgies for having to ask you why is it so important to have a 12 bit adc result surely the microchip that you are using is sufficient in that it already has onbourd adc module and can provide a 10bit adc result plus a number of adc channels It makes sence if you must have 12bit results but why do this when you have a micro that can do this for you

Also without meaning to sound rude the link to your zip file comes from another site Could you please if you want people to view contents and help you with this please would you upload directly to this site Otherwise this presents a possible security risk

Thankyou

Mark