AN9541-BATImpedance integration with other controllers (no ADICUP3029 CPU)

Question

Hi Akila, and others in you team. I am trying to integrate the BAT Impedance application code examples with my Linux based system (no ADICUP3029 CPU) I

CAMTEK · Accepted Answer

SUMMARY 1. MY BASIC SYSTEM IS NOW WORKING WITH MY MODIFIED UPDATED CODE AND HARDWARE MODIFICATIONS AS PREVIOUSLY DESCRIBLED ABOVE. FINALLY, NOW I CAN CONTINUE WITH MY INTENDED APPLICATION PROJECT AFTER LOOSING ~2 MONTHS WITHOUT ANY ADI HELP. 2. ADI ENGINEER ZONE FAILED TO PROVIDE ANY DECENT RESPONSE ( EXCEPT FOR IVAN's SHORT START) WITHIN A REASONABLE TIME AND THEY COULD HAVE EASILY HELPED ME SOLVE THESE ISSUES MUCH FASTER WITH SOME OFFICIAL RESPONSES AND POINTING ME IN THE RIGHT DIRECTION. 3. ADI&rsquo;s AD5940 SDK EXAMPLES ARE CONFUSING WITH LITTLE OR NO DOCUMENTATION. THERE ARE NUMEROUS CODING ERRORS WHICH I AM STILL WORKING THROUGH. 4. THE AD5940 DATASHEET IS A PATHETIC EXAMPLE OF A TECHNICAL DOCUMENT. I HAVE HAD TO EXTRACT MY OWN REGISTER TABLE DEFINITIONS AND CREATE NEW ad5940.c/.h files 5. I PURCHASED TWO EVAL-AD5941BATZ DEVELOPMENT BOARDS ( BOUGHT THE 2ND ONE BECAUSE I THOUGHT THE FIRST ONE WAS FAULTY) BUT NOW REALISE THOSE BOARDS WERE SHIPPED INCOMPLETE WITHOUT NEEDED HEADERS AND JUMPERS AND THE EXAMPLE CODE WOULD NOT HAVE MADE IT FUNCTION. THIS HAS GIVEN ME MANY HOURS OF LOST TIME AND EXPERIENCE. I THINK ADI SHOULD RIGHTLY REFUND/COMPENSATE/REPLACE THOSE BOARDS OR AT THE VERY LEAST SEND ME SOME NEW EVAL BOARDS LIKE THE MULTI-CHANNEL IMPEDANCE BOADS THAT I CAN TEST AND EVALULATE. 6. TO MAKE THE EVAL-AD5941BATZ DEVELOPMENT BOARDS WORK JUMPERS JP7 and JP9 MUST BE INSTALLED. JP8 IS NOT USED AND PERFORMS NO USEFUL FUNCTION AT ALL. IF JP9 IS LEFT OUT (AS IS THE CASE WHEN THE BOARDS ARE SHIPPED) THE U2 MUX INPUT DEFAULTS TO HIGH WHICH MEANS ALL BATTERY IMPEDANCE MEASUREMENT RESULTS ARE SIMPLY THE IMPEDANCE SCAN OF THE INTERNAL RCAL, YOU WILL JUST GET FAKE RESULTS OF 50 MILLIOHMS. IF YOU INTEND TO USE THIS AD5940 CHIP WITH YOUR OWN MCU, BE WARNED THAT IT HAS A CONFUSING SET OF SPI COMMUNICATION RULES AND IF YOU INTEND TO USE THIS DEVICE WITH A DIFFERENT CPU CONTROLLER (OTHER THAN THE ADI (ADuCM3029) YOU NEED TO REWORK/MODIFY THE DRIVERS AND THE SDK EXAMPLE CODE TO MAKE THINGS WORK AS THEY SHOULD. GOOD LUCK, REGARDS 7. ADDITIONAL NOTES added 12th DECEMBER After further investigation and detailed responses by Akila, I admit I was wrong on the issues concerning the use of Jumpers JP8 & JP9. I confirm that these Jumpers are not required on the EVAL-AD5941BATZ board as the ADI SDK code example does indeed separately control the ADG636 front end analog multiplexer using the AD5940 GPIO2 pin. I also thank ADI Forum Support team member, Ivan for his help on providing crucial details to help me solve SPI communication details and AD5940 register definitions. 
 8. ADDITIONAL NOTES added 19th DECEMBER After further testing, I have discovered further significant issues with the ADI SDK BATImpedance App programming concerning specific coding issues that cause significant errors in RCAL and impedance measurement results, these provide irrational behavior and errors in outputs especially at the lower sweep frequencies when using the AD5940 sequencer and DSP settings. I suggest NOT to use the sequencer for MRCAL and impedance measurements at low frequencies. As these issues are unrelated to this original post, I have started a new post query at ......"to be specified soon" ... hopefully ADI Support team can provide some detailed answers. 
 
 CAMTEK)

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AN9541-BATImpedance integration with other controllers (no ADICUP3029 CPU)

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