237-00156 SofTec Microsystems SRL, 237-00156 Datasheet - Page 17

• Manufacturer Part Number: 237-00156
• Description: BOARD ISOLATION FOR ST7
• Manufacturer: SofTec Microsystems SRL
• Type: Optoisolation Boardr

Specifications of 237-00156

• Contents: *
• For Use With/related Products: STMicro ST7FMC Motor Control Device
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

1
Overview
1.2 ST7FMC Family Overview
The ST7FMC microcontroller family is designed for mid-range applications
with a Motor Control dedicated peripheral. All devices are based on a
common industry-standard 8-bit core, featuring an enhanced instruction set
and are available with FLASH memory.
The ST7 Motor Controller peripheral (MTC) can be seen as a three-phase,
pulse-width modulator multiplexed on six output channels and a Back
Electromotive Force (BEMF) zero-crossing detector for sensorless control of
Permanent Magnet Brushless Direct Current (BLDC) motors.
The MTC is particularly suited to driving brushless motors (either induction or
permanent magnet types) and supports operating modes like:
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1.3 The Brushless DC (BLDC) Motor
A brushless DC (BLDC) motor is a rotating electric machine where the stator
is a classic three-phase stator like that of an induction motor and the rotor
has surface-mounted permanent magnets. In this respect, the BLDC motor
is equivalent to a reversed DC commutator motor, in which the magnet
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Commutation step control with motor voltage regulation and current
limitation.
Commutation step control with motor current regulation, i.e. direct
torque control.
Position sensor or sensorless motor phase commutation control (six-
step mode).
BEMF zero-crossing detection with high sensitivity. The integrated
phase voltage comparator is directly referred to the full BEMF voltage
without any attenuation. A BEMF voltage down to 200 mV can be
detected, providing high noise immunity and self-commutated operation
in a large speed range.
Real-time motor winding demagnetization detection for fine-tuning the
phase voltage masking time to be applied before BEMF monitoring.
Automatic and programmable delay between BEMF zero-crossing
detection and motor phase commutation.
PWM generation for three-phase sinewave or three-channel
independent PWM signals.