SPRUJ55D September 2023 – July 2025 AM263P2 , AM263P2-Q1 , AM263P4 , AM263P4-Q1
Resolver calculates the arctan of sin and cos inputs. It then feeds this arctan signal to a second order phase locked loop (Track2).
The rotational speed(in frequency units) can be calculated based on following formula:
Speed = VELOCITY × (1/Ts) × (1/232) : This is rotational speed in Hz.
where
EXC_FREQ_SEL : Excitation frequency setting MMR part of EXCIT_SAMPLE_CFG1[7:0] register.
ENABLE_BOTTOM(0 or 1) : bottom sampling control MMR part of DEC_GF_CFG[24] register bit: 1 doubles the data rate.
Fs = 100 × EXC_FREQ_SEL × (1 + ENABLE_BOTTOM) : This is the effective sampling rate of track2 loop
Ts = 1/Fs : This is the effective sampling time of track2 loop
VELOCITY: 32b signed register output of track2. Part of VELOCITY_TRACK2_x[31:0] register.