Uni-3 Motor Protection Logic - Motorola DSP56F803 Hardware User Manual

2.14.1 UNI-3 Motor Protection Logic

The UNI-3 DC Bus Over-Voltage signal is connected to the DSP's PWM group's fault
input, FAULT0. The UNI-3 DC Bus Over-Current signal is connected to the DSP's PWM
group's fault input, FAULT1. Additionally, the UNI-3 DC Bus Over-Voltage and
Over-Current analog signals are connected to two DSP A/D inputs, AN0 and AN1,
respectively. Figure 2-11
Over-Current circuit for the UNI-3 interface.
DC BUS VOLTAGE SENSE
V_sense_DCB
DC BUS CURRENT SENSE
I_sense_DCB
Figure 2-11. DC Bus Over-Voltage and Over-Current Detection Schematic
contains the diagram of the DC Bus Over-Voltage and DC Bus
+5.0V
+5.0V
Diagram
Technical Summary
Motor Protection Logic
+3.3V
+5.0V
+
– LM393
+3.3V
+5.0V
+
–
LM393
FAULT0
FAULT1
2-15