Background:
Rz/t1 is using in my project and i used ΔΣ Interface to get motor Current.
setting：using Ap4 to Configure ΔΣ Interface, and starting the ΔΣ sample in Initialization process and hold on operating state that to say i never stop ΔΣ sample.
when entry the timer interrupt, i read the Current Value Register and calculate the current.
Question:
The current is sampled accurately which current is a constant that Contrast oscilloscope current probe.
But when i control the motor running in the Torque mode, ΔΣ smapled current is bigger than that smapled by oscilloscope current probe and the difference increases with the increase of current.
1.So i want to know anyone has a similar problem ?
2.The value read from Current Value Register Whether after calculation by weighing flow Gaussian distribution like about showing or just a Instantaneous value.
3. My usage that hold ΔΣ sample on operating Whether correct? Do you need to turn on and stop ΔΣ sample in an appropriate time?
4.How to calculation the Filter Settling Time in Rz/T1. and i reference the url under line, the time = 3 * 64 /12.5 = 15.36us is correct?
www.analog.com/.../fundamental-principles-behind-sigma-delta-adc-topology-part2.html