ST7MC1 datasheet(186/308 Pages) STMICROELECTRONICS

186 / 308 page

ST7MC1/ST7MC2

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MOTOR CONTROLLER (Cont’d)

Table 44. Current Window filter Setting

Note: Times are indicated for 4 MHz fPERIPH

The Current Window filter is activated each time

the PWM is turned ON. It blanks the output of the

current comparator during the time set by the

CFW[2:0] bits in the MCFR register. The reset val-

ue is 000b (blanking window off).

The Current feedback filter sets the number of

consecutive valid samples (when current is above

the limit) needed to generate the active CL event

used to turn OFF the PWM. The reset value is 1.

The sampling of the current comparator is done at

fPERIPH/4.

Table 45. Current Feedback Filter Setting

The ON time of the resulting PWM starts at the

end of the measurement window (rising edge),

and ends either at the beginning of the next meas-

urement window (falling edge), or when the cur-

rent level is reached.

Note: Be careful that the current comparator is

OFF until the CKE and/or DAC bits are set in the

MCRA register.

CFW2

CFW1

CFW0

Blanking window length

Blanking window off

0.5 µs

1 µs

1.5 µs

2 µs

2.5 µs

3 µs

3.5 µs

CFF2

CFF1

CFF0

Nb of Feedback Samples

needed to turn OFF PWM

000

001

010

011

100

101

110

111

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