ST7MC1K2-Auto datasheet(209/371 Pages) STMICROELECTRONICS

209 / 371 page

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On-chip peripherals

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Tachogenerator mode (IS[1:0] = 00, 01 or 10)

Any of the MCIx input pins can be used as a tachogenerator 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 input 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 sensitive; set-up is done with the TES[1:0] bits (keeping in mind that

TES[1:0] = 00 configuration is reserved for position sensor/

sensorless modes).

Having only one edge selected eliminates any incoming signal dissymmetry, which may due to pole-to-

pole magnet dissymmetry or from a comparator threshold with low level signals.

Figure 91 presents the signals generated internally with different tacho input and TES bit settings.

Hall sensors

This configuration is also suitable for motors using three hall sensors for position detection and not driven

in six-step mode (refer to Speed measurement mode on page 227).

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

initialization value of the IS[1:0] bits has to be entered in direct access mode. This is done by setting the

DAC bit in the MCRA register during the speed sensor input initialization routine.

Figure 89.

Input stage in speed sensor mode (TES[1:0] bits = 01, 10, 11)

According to IS[1:0] bits setting.

Inputn sel

MCIC

MCIA

MCIB

Input block

Input comparator block

Event detection

MPHST register

In1

Clk

Encoder clock

encoder

interface

Incremental

Direction

In2

Tacho1) or encoder

EDIR bit

Tacho capture

TES[1:0]

MPAR register

MCRC register

IS[1:0]

Tacho1) or encoder

Tacho1) or free I/O

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