ST7MC1 datasheet(225/308 Pages) STMICROELECTRONICS

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ST7MC1/ST7MC2

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MOTOR CONTROLLER (Cont’d)

MOTOR Z EVENT FILTER REGISTER (MZFR)

Read/Write

Reset Value: 0000 1111 (0Fh)

Bits 7:4 = ZEF[3:0]: Z Event Filter bits

These bits select the number of valid consecutive

Z events (when the Z event is detected) needed to

generate the active event. Sampling is done at the

selected fSCF frequency (see Table 82.) or at

PWM frequency.

Table 80. Z Event filter Setting

Bits 3:0 = ZWF[3:0]: Z Window Filter bits

These bits select the length of the blanking win-

dow activated at each D event. The filter blanks

the Z event detection until the end of the time win-

dow.

Table 81. Z Window filter Setting

Note: Times are indicated for 4 MHz fPERIPH

ZEF3

ZEF2

ZEF1

ZEF0

ZWF3

ZWF2

ZWF1

ZWF0

ZEF3

ZEF2

ZEF1

ZEF0

Z event Samples

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

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