ST7MC1 datasheet(137/308 Pages) STMICROELECTRONICS

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ST7MC1/ST7MC2

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10.6 MOTOR CONTROLLER (MTC)

10.6.1 Introduction

The ST7 Motor Controller (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 sensor-

less control of Permanent Magnet Direct Current

(PM BLDC) brushless motors.

The MTC is particularly suited to driving brushless

motors (either induction or permanent magnet

types) and supports operating modes like:

– 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 com-

mutation control (six-step mode)

– BEMF zero-crossing detection with high sensitiv-

ity. 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.

– Realtime motor winding demagnetization detec-

tion 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.

Table 22. MTC Functional Blocks

Section

Page

Input Detection Block

145

Input Pins

145

Sensorless Mode

148

D Event detection

149

Z Event Detection

150

Demagnetization (D) Event

152

Z Event Generation (BEMF Zero Crossing)

154

Protection for ZH event detection

156

Position Sensor Mode

157

Sampling block

158

Commutation Noise Filter

161

Speed Sensor Mode

163

Tachogenerator Mode

163

Encoder Mode

164

Summary

165

Delay Manager

167

Switched Mode

168

Autoswitched Mode

170

Debug Option

171

Checks and Controls for simulated events

174

Speed Measurement Mode

179

Summary

184

PWM Manager

184

Voltage Mode

184

Over Current Handling in Voltage mode

185

Current Mode

185

Current Feedback Comparator

185

Current feedback amplifier

187

Measurement Window

187

Channel Manager

189

MPHST Phase State Register

190

Emergency Feature

190

Dead Time Generator

193

Programmable Chopper

198

PWM Generator Block

199

Main Features

199

Functional Description

200

Prescaler

200

PWM Operating mode

200

Repetition Down-Counter

204

PWM interrupt generation

204

Timer Re-synchronisation

205

PWM generator initialization and start-up

205

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