Problem with tuning Digital Filter 2.0 | Cypress Semiconductor
Problem with tuning Digital Filter 2.0
The Filter_SampleProject contains an example for the use of the Filter component. This project works properly. But if I try to change the parameters of the filter it doesn't work.
For example: I want to design a Band Pass Filter with band 0.7-0.9 kHz .
In the Filter_SampleProject I've changed parameters:
Sample Rate [ksps]: 22
Filter Stages: 1
Filter Gain: 3 dB
Fiter Class: FIR
Filter Tipe : Band pass
Filter taps: 64
Centr: 0.8 kHz
Bandwith: 0.2 kHz
It doesn't work.
If I guess (but I'm not sure!) the problem is with the Filter coherency. In the Filter_SampleProject this paraneter is : Filter_COHER_REG = 0x55;
I've read Filter's Datasheet and Registers TRM but there are any information how to calculate Filter_COHER_REG.
Could you help me with this problem, please?