Hi Eduardo, How is the 3.7V (battery) voltage referenced to the ADC, it is floating or does it connect to the ADC ground? I would recommend trying to measure the bridge ratiometically. By this I mean, that you take the excitation voltage (used to power the bridge) and route it to the ADS1262 (pins AIN2 and AIN3, for example) and then configure the ADS1262 to use an external reference ( AIN2/AIN3 in this case). In this way, if your excitation voltage changes, the ADC's reference voltage AND bridge voltage will change proportionally. Since the ADC is measuring the ratio of VIN/VREF, you should see that the ADC conversion remains much more stable.
↧