CCS/UCD3138: Q format

user5935683

Prodigy 10 points

Part Number: UCD3138

Tool/software: Code Composer Studio

int32 kp;

iv.pis.p = iv.pis.kp * steady_state_error; //Q15*Q12

Why Kp defaults to Q15 in PID？

over 6 years ago

0 Cormac Harrington over 6 years ago

TI__Intellectual 1245 points

Hello

I would think its Q15 as you get enough resolution, but are still under 32 bits when multiplying by a Q12 (the error is from the 12-bit ADC so will always be Q12).

Hope this helps

best regards

Cormac

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CCS/UCD3138: Q format