Motor Control Pwm Signals And Leds; Motor Protection Logic; Pwm Group Interface And Leds - Motorola DSP56F803 Hardware User Manual

2.13 Motor Control PWM Signals and LEDs

The DSP56F803 has a dedicated PWM unit. The unit contains six PWM, three Phase
Current sense and four Fault input lines. The 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 DSP's PWM outputs to the PWM LEDs. The PWM LEDs
indicate the status of PWM group signals, refer to
are routed out to headers and are available for use by the end user.
DSP56F803
PWMA0
PWMA1
PWMA2
PWMA3
PWMA4
PWMA5

2.14 Motor Protection Logic

The DSP56F803EVM contains a UNI-3 connector that interfaces with various motor drive
boards. The DSP 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 DSP board via the UNI-3 connector. These
analog input signals are compared to limits set by trimpots. If the input analog signals are
greater than the limit set by the trimpot, a digital-compatible, +3.3V DC, fault signal is
generated.
2-14
BUFFER
Figure 2-10. PWM Group Interface and LEDs
DSP56F803EVM Hardware User's Manual
Figure 2-10. The PWM group signals
UNI-3
PWMA0
PWMA1
PWMA2
PWMA3
PWMA4
PWMA5
YELLOW LED
LED 2
GREEN LED
LED 3
YELLOW LED
LED 4
GREEN LED
LED 5
YELLOW LED
LED 6
GREEN LED
LED 7
+3.3V
PWM_AT / 0
PWM_AB / 1
PWM_BT / 2
PWM_BB / 3
PWM_CT / 4
PWM_CB / 5