ST7MC1 datasheet(163/308 Pages) STMICROELECTRONICS

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ST7MC1/ST7MC2

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MOTOR CONTROLLER (Cont’d)

10.6.6.11 Speed Sensor Mode

This mode is entered whenever the Tacho Edge

Selection bits in the MPAR register are not both re-

set (TES[1:0] = 01, 10 or 11). The corresponding

block diagram is shown in Figure 88.

Either Incremental Encoder or Tachogenerator-

type speed sensor can be selected with the IS[1:0]

bits in the MPHST register.

10.6.6.12 Tachogenerator Mode (IS[1:0] = 00, 01

or 10)

Any of the MCIx input pins can be used as a tacho-

generator input, with a digital signal (externally

amplified for instance); the two remaining pins can

be used as standard I/O ports.

A digital multiplexer connects the chosen MCIx in-

put to an edge detection block. Input selection is

done with the IS[1:0] bits in the MPHST register.

An edge selection block is used to select one of

three ways to trigger capture events: rising edge,

falling edge or both rising and falling edge sensi-

tive; set-up is done with the TES[1:0] bits (keeping

in mind that TES[1:0] = 00 configuration is re-

served for Position Sensor / Sensorless Modes).

Having only one edge selected eliminates any in-

coming signal dissymmetry, which may due to

pole-to-pole magnet dissymmetry or from a com-

parator threshold with low level signals.

Figure 89 presents the signals generated internal-

ly with different tacho input and TES bit settings.

Note on Hall Sensors: This configuration is also

suitable for motors using 3 hall sensors for position

detection and not driven in six-step mode (refer to

“Speed Measurement Mode” on page 179).

Note on initializing the Input Stage: As the

IS[1:0] bits in the MPHST register are preload bits

(new values taken into account at C event), the in-

itialization value of the IS[1:0] bits has to be en-

tered in Direct Access mode. This is done by set-

ting the DAC bit in the MCRA register during the

speed sensor input initialization routine.

Figure 88. Input Stage in Speed Sensor Mode (TES[1:0] bits = 01, 10, 11)

Inputn Sel

MCIC

MCIA

MCIB

Input Block

Input Comparator Block

Event Detection

MPHST Register

In1

Clk

Encoder

interface

Incremental

Direction

In2

Tacho§ or

Encoder

EDIR bit

Clock

Tacho

Capture

TES[1:0]

MPAR Register

MCRC Register

Tacho§ or

Encoder

Tacho§ or

Free I/O

§ = According to IS[1:0] bits setting

IS[1:0]

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