Motorola M68HC08 Reference Manual page 92

Sensorless bldc motor control using the mc68hc908mr32
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Software Design
Designer Reference Manual
92
Freescale Semiconductor, Inc.
Current measurement and current calibration when PWM is OFF
Before testing of the start switch, dc-bus current is measured when
PWM is OFF. This way the dc-bus current measurement path is
calibrated. The calibrated value Offset0_Curr is used for the final
current calculation.
This offset on the ADC input should ideally be 1.65 V at 0 dc-bus current.
If the sensed value exceeds the limit (Offset_Max_Curr) when PWM
is OFF, this indicates some hardware error, and the control flow
enters into the fault state:
Start condition test
The start condition is tested. If in manual mode (PCMode = 0), the
start condition is a movement in the switch from stop to start. In PC
master software mode (PCMode = 1), the start condition in switch
start position and StartCtrl = 1. If start condition valid then Strt_F is
set, Stop_F is cleared, and the next state entered.
Software Design
For More Information On This Product,
Go to: www.freescale.com
DRM028 — Rev 0
MOTOROLA

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