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???
06/11/07 06:02
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#140534 - MCP3202 ADC problem
Responding to: ???'s previous message
Hello Steve,
It is standard ckt. Voltage input to CH0 is from voltage divider Res. 1.1Mohm and 5K6. The Amp input is to CH1 from
secondary of 5A CT AND 100E load resistance. Common of Voltage and Amps input is connected to midpt of REF voltage of ADC from
one of 324amp as voltage follower. The serial lines are connected to Port 3. Din=P3.7 Dout= 3.6 SCLK = 3.5 _CS = 3.4.
The program will post here later. I cant post ckt diagram so
will put on my photos site at Yahoo and give link here. Program
has lots of tabs and doesnt look good here so after making / removing tabs will post.
Hope this is ok. I also reversed the CH1 & Ch0 connections but
problem is same.
Please let me know what happens if 3202 gets configured as
differential instead of single ended input and -ve Input is at
halfpoint? Does the MCP gets destroyed? I suspect that somehow
the single/differential bit sent first isnt loaded and 3202 gets
configured as differential.

regards,
psdayama

List of 25 messages in thread
TopicAuthorDate
MCP3202 ADC problem            01/01/70 00:00      
   Circuit ?            01/01/70 00:00      
      MCP3202 ADC problem            01/01/70 00:00      
         Testing strategy recommendation            01/01/70 00:00      
            Prototype            01/01/70 00:00      
               Could you specify all parts of your circuit?            01/01/70 00:00      
               What is driving the inputs of CD4052?            01/01/70 00:00      
                  Diagram blues            01/01/70 00:00      
                     Why diode in /CS line of MCP3202?            01/01/70 00:00      
                     Voltage divider directly to input of CD4052?            01/01/70 00:00      
                     Pseudo-differential mode?            01/01/70 00:00      
                        Who cares for Psudo?            01/01/70 00:00      
                           You definitely need buffers at the inputs of ADC!            01/01/70 00:00      
                              No violations            01/01/70 00:00      
      Here is CKT & code            01/01/70 00:00      
         Uncommented, unformatted code :-(            01/01/70 00:00      
            connection to CH0 & CH1            01/01/70 00:00      
               Ckt Diagram            01/01/70 00:00      
            Commented code            01/01/70 00:00      
               Some changes needed            01/01/70 00:00      
                  Formatting Forward Slash - not Backslash!            01/01/70 00:00      
                  Setup problem            01/01/70 00:00      
               Togglings needed while /CS is high?            01/01/70 00:00      
                  toggling CLK doesnt help!            01/01/70 00:00      
      A picture is worth a 1000 words            01/01/70 00:00      

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