ST7FMC2N6B6(2004) 데이터 시트보기 (PDF) - STMicroelectronics

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ST7FMC2N6B6
(Rev.:2004)

8-BIT MCU WITH NESTED INTERRUPTS, FLASH, 10-BIT ADC, BRUSHLESS MOTOR CONTROL, FIVE TIMERS, SPI, LINSCI™

STMicroelectronics 

ST7MC1/ST7MC2

MOTOR CONTROLLER (Cont’d)

Table 44. Current Window filter Setting

CFW2 CFW1 CFW0 Blanking window length

0

0

0

Blanking window off

0

0

1

0.5 µs

0

1

0

1 µs

0

1

1

1.5 µs

1

0

0

2 µs

1

0

1

2.5 µs

1

1

0

3 µs

1

1

1

3.5 µs

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

CFF2 CFF1 CFF0

0

0

0

0

0

1

0

1

0

0

1

1

1

0

0

1

0

1

1

1

0

1

1

1

Nb of Feedback Samples

needed to turn OFF PWM

1

2

3

4

5

6

7

8

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.

183/294

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