UM0432 datasheet(28/53 Pages) STMICROELECTRONICS

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Motor control operations

UM0432

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Table 9.

"3-phase BLAC/DC (trapezoidal)" advanced parameters

Parameter name

Description

Switches PWM frequency

Pulse width modulation (PWM) frequency in kHz.

Switches PWM minimum off

time

PWM minimum off time in microseconds (µs) to detect the BEMF.

Complementary PWM signal

Enables or disables synchronous rectification.

Dead time

Value of dead time in µs (only if complementary PWM enabled).

Current loop

Current blanking window

Time window filter in milliseconds to prevent erroneous sampling of the current

after the PWM is turned ON.

Current event counter filter

Defines the number of counter events required to validate a current limitation event.

D and Z sampling parameters

Sampling clock

Sets the frequency of the sampling clock for D and Z events in kHz.

Unused MCIx input

Defines in which state the unused MCI input is fixed, either "Grounded" or "Hi-Z".

Zero crossing

After D blanking window

Sets the blanking window after a D event in microseconds (µs).

Z event counter filter

Defines the number of counter events required to validate a Z event.

Threshold voltage

Voltage set (in volts) for Z detection.

Demagnetization

After C blanking window

Sets the blanking window after a C event in microseconds (µs).

D event counter filter

Defines the number of counter events required to validate a D event.

Demagnetization method

Three methods are available: "all hardware", "alternate hardware/software" or "all

software".

Demagnetization time

fixed demagnetization time in microseconds (µs) (only with demagnetization

methods “all software”)

Force duty cycle during

demagnetization

Allows using a different value of the duty cycle rather than the one in the run time

setting.

Duty cycle

Value of duty cycle percentage forced during demagnetization.

Stop condition

Free wheeling

After stopping, the motor continues to spin freely.

DC current braking

Enables or disables DC current braking.

Brake level

Value of duty cycle percentage of PWM brake signal.

Brake time

Duration in milliseconds of the active brake.

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