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ST7MC1K2 数据表(PDF) 236 Page - STMicroelectronics |
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ST7MC1K2 数据表(HTML) 236 Page - STMicroelectronics |
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236 / 371 page  Obsolete Product(s) - Obsolete Product(s) On-chip peripherals ST7MC1K2-Auto, ST7MC1K6-Auto, ST7MC2S4-Auto, ST7MC2S6-Auto 236/371 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) 1. Times are indicated for 4 MHz fPERIPH. CFW2 CFW1 CFW0 Blanking window length 0 0 0 Blanking window off 0 0 1 0.5 µs 01 0 1 µs 0 1 1 1.5 µs 10 0 2 µs 1 0 1 2.5 µs 11 0 3 µs 1 1 1 3.5 µs Table 103. Current feedback filter setting CFF2 CFF1 CFF0 No. of feedback samples needed to turn off PWM 00 0 1 00 1 2 01 0 3 01 1 4 10 0 5 10 1 6 11 0 7 11 1 8 Obsolete Product(s) - Obsolete Product(s) |
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