Back-Emf And Motor Phase Current Sensing; Faultb1 Selection Circuit; Faultb1 Source Selection Jumper - Motorola Digital DNA DSP56F807 Hardware User Manual

DC BUS CURRENT SENSE
I_sense_DCB
PHASE A CURRENT SENSE
PHA_IS
Table 2-10. FAULTB1 Source Selection Jumper

2.17 Back-EMF and Motor Phase Current Sensing

The primary and secondary UNI-3 connectors supply Back-EMF and Motor Phase
Current signals from the three phases of a motor attached to a motor drive unit. The
Back-EMF signals on the UNI-3 connectors are derived from a resistor divider network
contained in the motor drive unit. These resistors divide down the attached motor's
Back-EMF voltages to a 0 to +3.3V level. The Motor Phase Current signals are derived
from current sense resistors. Both of these signal groups are then routed to a group of
2-22
+5.0V
+5.0V
+
–
+5.0V
+5.0V
+
–
Figure 2-14. FAULTB1 Selection Circuit
JG2
1–2 Phase A Over-Current Sense input
2–3 DC Bus Over-Current Sense input
DSP56F807EVM Hardware User's Manual
+3.3V
LM393
+3.3V
LM393
Comment
JG2
3
FAULTB1
2
1