2-16
56F805EVM Hardware User’s Manual
MOTOROLA
2.15 Motor Control PWM Signals and LEDs
The 56F805 has two independent groups of dedicated PWM units. Each unit contains six
PWM, three Phase Current sense and four Fault input lines. PWM group A’s PWM lines
are connected to the UNI-3 interface connector and to a set of six PWM LEDs via
inverting buffers. The buffers are used to isolate and drive the controller’s PWM outputs
to the PWM LEDs. Most of the secondary PWM signals are routed to the Secondary
UNI-3 connector. The PWM LEDs indicate the status of PWM group A signals; as shown
in
. PWM Group A and B signals are routed out to headers and are available
for use by the end user.
Figure 2-11. PWM Group A Interface and LEDs
2.16 Motor Protection Logic
The 56F805EVM contains two UNI-3 connectors that interface with various motor drive
boards, Primary UNI-3 and Secondary UNI-3. The device can sense error conditions
generated by the motor power stage boards via signals on the UNI-3 connector. The motor
driver board’s Motor Supply DC Bus Voltage, Current and Motor Phase Currents are
sensed on the power stage board. The conditioned signals are transferred to the board via
the UNI-3 connector. These analog input signals are compared to a limit set by trimpots. If
the input analog signals are greater than the limit set by the trimpot, a hybrid controller
digital voltage-comp3.3V DC fault signal is generated.
56F805
BUFFER
UNI-3
PWMA0
PWMA1
PWMA2
PWMA3
PWMA4
PWMA5
PWMA0
PWMA1
PWMA2
PWMA3
PWMA4
PWMA5
YELLOW LED
GREEN LED
GREEN LED
GREEN LED
YELLOW LED
YELLOW LED
+5.0V
PWM_AT / 0
PWM_AB / 1
PWM_BT / 2
PWM_BB / 3
PWM_CT / 4
PWM_CB / 5
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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