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ST7MC1K2 数据表(PDF) 235 Page - STMicroelectronics |
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ST7MC1K2 数据表(HTML) 235 Page - STMicroelectronics |
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235 / 371 page  Obsolete Product(s) - Obsolete Product(s) ST7MC1K2-Auto, ST7MC1K6-Auto, ST7MC2S4-Auto, ST7MC2S6-Auto On-chip peripherals 235/371 Current mode In current mode, the PWM output signal is generated by a combination of the output of the measurement window generator (see Figure 108) and the output of the current comparator, and is directed to the output channel manager as well (Figure 109). The current reference is provided to the comparator by phase U, V or W of the PWM Generator (up to 12-bit accuracy) the signal from the three compare registers U, V or W can be output by setting the PWMU, PWMV or PWMW bits in the MPWME register. The PWM signal is filtered through an external RC filter on pin MCCREF. The detected current input must be present on the MCCFI pin. Current feedback comparator Two programmable filters are implemented: ● A blanking window (current window filter) after PWM has been switched ON to avoid spurious PWM OFF states caused by parasitic noise ● An event counter (current feedback filter) to prevent PWM being turned OFF when the first comparator edge is detected. Figure 106. Current window and feedback filters PWM on No End of blanking window? Current > limit? Limit = 1? Reset counter Increment counter Set the CL bit Counter = limit? No No Yes Yes No Yes Current window filter Current feedback filter Yes Obsolete Product(s) - Obsolete Product(s) |
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