ST7MC1K2-Auto datasheet(236/371 Pages) STMICROELECTRONICS

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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 value 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.

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 measurement window (falling edge), or

when the current 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.

Table 102.

Current window filter setting(1)

Times are indicated for 4 MHz fPERIPH.

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

Table 103.

Current feedback filter setting

CFF2

CFF1

CFF0

No. of feedback samples needed to turn off PWM

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