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DSP56F801EVM Hardware User’s Manual
2.15 Zero-Crossing Detection
An attached UNI-3 motor drive board contains logic that can send out pulses when the
phase voltage of an attached 3-phase motor drops to zero. The motor drive board circuits
generate a 0 to +5.0V DC pulse via voltage comparators. The resulting pulse signals are
sent to a set of jumper blocks shared with the Encoder/Hall-Effect interface. The jumper
blocks allow the selection of Zero-Crossing signals or Quadrature Encoder/Hall-Effect
signals. When in operation, the DSP will only monitor one set of signals,
Encoder/Hall-Effect or Zero-Crossing.
contains the Zero-Crossing and
Encoder/Hall circuits.
Figure 2-12. Zero-Crossing Encoder Interface
PFC
PWM
PFC
Zero
Cross
ZERO_X_A
ZERO_X_B
ZERO_X_C
1
2
3
4
5
6
+5.0V
FILTER
FILTER
FILTER
PIN 1: +5.0V
PIN 2: GROUND
PIN 3: PHASE A
PIN 4: PHASE B
PIN 5: INDEX
PIN 6: N/C
1
2
3
4
5
6
7
8
9
JG2
DSP56F801
TD0
TD1
TD2
JG9
1
2
3
4
5
6
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