ST72141K2 datasheet(44/132 Pages) STMICROELECTRONICS

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ST72141K

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MOTOR CONTROLLER (Cont’d)

8.1.4 Functional Description

The MTC can be split into four main parts as

shown in the simplified block diagram in Figure 28.

– The BEMF ZERO-CROSSING DETECTOR with

a comparator and an input multiplexer.

– The DELAY MANAGER with an 8-bit timer

(MTIM) and an 8x8 bit multiplier.

– The PWM MANAGER, including a measurement

window generator, a mode selector and a current

comparator.

– The CHANNEL MANAGER with the PWM multi-

plexer, polarity programming capability and

emergency HiZ configuration input.

8.1.4.1 Input Detection Block

This block can operate in sensor mode or sensor-

less mode. The mode is selected via the SR bit in

the MCRA register. The block diagram is shown in

Figure 29.

Figure 28. Simplified MTC Block Diagram

MCIA

MCIB

MCIC

BEMF=0

MCO5

MCO4

MCO3

MCO2

MCO1

MCO0

TIMER

DELAY = WEIGHT x Zn

MCCFI

OCP1A

NMCES

DELAY

CAPTURE Zn

COMMUTE [C]

MEASUREMENT

WINDOW

GENERATOR

CURRENT

VOLTAGE

MODE

Internal VREF

WEIGHT

PWM (1)

Note 1: The PWM signal is generated by the ST7 16-bit Timer

(I)

(V)

(I)

(V)

R1ext

Cext

(I)

DELAY MANAGER

CHANNEL MANAGER

BEMF ZERO-CROSSING

DETECTOR

PWM MANAGER

[Z]

(V)

(I)

[Z] : Back EMF Zero-crossing event

Zn : Time elapsed between two consecutive Z events

[C] : Commutation event

Cn : Time delayed after Z event to generate C event

(I): Current mode

(V): Voltage mode

MTIM

R2ext

VDD

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