ST7MC1 datasheet(150/308 Pages) STMICROELECTRONICS

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ST7MC1/ST7MC2

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MOTOR CONTROLLER (Cont’d)

10.6.6.4 Z Event Detection

In sensorless mode, the Z window filter becomes

active after each D event. It blanks out the Z event

during the time window defined by the ZWF[3:0]

bits in the MZFR register (see Table 28). The reset

value is 200µs. This Window Filter becomes active

after both hardware and software D events.

The Z Event Filter becomes active after the Z Win-

dow Filter. It counts the number of consecutive Z

events up to a limit defined by the ZEF[3:0] bits in

the MZFR register. The reset value is 1. The Z bit

is set when the counter limit is reached.

Sampling is done at a selectable frequency

(fSCF), see Table 82.

The Z event filter is active only for a hardware Z

event (ZH). For a simulated (ZS) event, it is forced

to 1. Z event filter is also active in sensor mode.

Figure 80. Z Window and Event Filter Flowchart

Table 28. Z Window filter Setting

Note: Times are indicated for 4 MHz fPERIPH

Table 29. Z Event filter Setting

End of

Blanking

Event

Sampling

Limit=1?

Reset counter

Increment counter

Set the Z bit

Counter=Limit?

Yes

WINDOW

FILTER

EVENT

FILTER

Yes

Window

ZWF3 ZWF2 ZWF1 ZWF0

D to Z window fil-

ter in Sensorless

Mode (SR=0)

SR=1

5 µs

Win-

dow

Filter

after

event

10 µs

15 µs

20 µs

25 µs

30 µs

35 µs

40 µs

60 µs

80 µs

100 µs

120 µs

140 µs

160 µs

180 µs

200 µs

ZEF3

ZEF2

ZEF1

ZEF0

Z event Limit

000

001

010

011

100

101

110

111

000

001

010

011

100

101

110

111

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