AN1913D Freescale Semiconductor / Motorola, AN1913D Datasheet - Page 33

• Manufacturer Part Number: AN1913D
• Description: 3-phase BLDC Motor Control with Sensorless Back-EMF ADC Zero Crossing Detection using DSP 56F80x
• Manufacturer: Freescale Semiconductor / Motorola

ADC complete ISR:
Application State Machine:
proceeds/sets requirements of:
Commutation Control
proceed Status_Commutation:
Omega Required Mechanical
Drive Fault Status
Application Mode
Control Speed
Control Alignment Current
Zero Crossing Offset
Check Run/Stop Switch
read phase voltages
read Temperature
set Current Control Rq
set Zero Crossing Offset Rq
Running
Starting
Alignment
Stopped
DC-Bus Voltage/Current
Interrupt
ADC complete
Initialize
Figure 7-1. Main Software Flow Chart - Part 1
Reture
BLDC control with BEMF Zero Crossing using ADC
Reset
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Speed/Alignment Timer OC ISR:
PWM Reload ISR:
Commutation Timer OC ISR:
set Speed Control Request
Alignment state timing
ADC Zero Crossing ISR:
start ADC (sync. Zero Crossing)
memorize sampling time
Motor Commutation Timing
Commutation. Control Proceed
Zero Crossing Setting
read phase voltages
evaluate Zero Crossing
Interrupt
OC Cmt2Timer
Interrupt
ADC Zero Crossing
Interrupt
PWM A Reload
Interrupt
OC Cmt Timer
Reture
Reture
Reture
Reture
Software Design
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