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HT66FM5440
Brushless DC Motor A/D Flash MCU
HT66FM5440
Brushless DC Motor A/D Flash MCU
Noise Filter
The external NFIN pin is connected to an internal filter to reduce the possibility of unwanted event
counting events or inaccurate pulse width measurements due to adverse noise or spikes on the NFIN
input signal, and then outputs to the 16-bit PTM0 capture circuit in order to ensure that the motor
control circuit works normally.
The noise filter circuit is a
n
I/O surge filtering analog circuit which can filter micro-second grade
sharp-noise.
Antinoise pulse width maximum:
(NF_VIH[4:0]-NF_VIL[4:0])×5μs, (NF_VIH[4:0]-NF_VIL[4:0])>1
CINS
PT0CAPTS
NF_BYPS
Noise Filter
1
0
1
0
1
0
NFIN
PD0
Data_O�t
Data_In
Edge
Detector
PT0IO1~PT0IO0
150ns noise filter
TCK0
TP0_0
Dat_In
Dat_Out
Noise Filter
Dat_In
Dat_Out
NF_VIH[4:0] NF_VIL[4:0]
PTM0