Design Consideration
MPC560xB Controller Board User’s Guide, Rev. 0
Freescale
23
Figure 9. Example of BLDC Motor Commutation
4.5
Analog Signal Sensing
The analog input signals listed in
Figure 10
,
Table 16
, and
Table 17
are connected to the analogue to digital
converters through the RC filters. The time constant of RC filter is set with respect to the input signal
bandwidth.
Figure 10. Analog Sensing Circuit
4.6
UNI-3 PFC-PWM Signal (Power Factor Correction)
The PFC-PWM signal is used to control a power stage circuit such as a PFC or a power DC-DC converter
(when available). These signals are connected to the MPC560xB controller. For more details, see
Table 21
.
4.7
UNI-3 Brake Signal
The brake signal output is used to control the DC-bus resistor switch. It is controlled via GPIO A[4].
Table 21. UNI-3 PFC-PWM Signals
Signal
MPC5606B signal
UNI-3 pin
PFC-PWM
EMIOS1_CH0
31
PFC_ENABLE
GPIO A[13]
32
PFC_ZERO_CROSS
EMIOS1_CH1
33
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