topic Re: MKM33 AFE Modular in Kinetis Microcontrollers

MKM33 AFE Modular

huasu — Fri, 21 Nov 2014 08:50:22 GMT

use AFE module, found that the voltage input differential voltage and the calculated value is different, the difference of about 13%. For example, into a differential signal 200mV, read out from the results of balance device value is 3175931, then the calculated results should be 227mv (3175931/8388607 (0x7FFFFF) * 600 (MV) = 227mv), so the measured value is 227mv butinto value is 200mv. and therefore the result is wrong. Don't know why

Re: MKM33 AFE Modular

Paul_Tian — Thu, 27 Nov 2014 06:25:09 GMT

Hi, Su Hua

Would you please help to show how do you check the analog voltage value? Do you use times measurement and calculate average value? You can use hardware average function.

Best Regards

Paul

Re: MKM33 AFE Modular

huasu — Thu, 27 Nov 2014 07:33:52 GMT

Hi, Zhe Tian

I have no found‍ hardware average function in the afe modular.thanks