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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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ST7MC1K2 数据表(PDF) 224 Page - STMicroelectronics |
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ST7MC1K2 数据表(HTML) 224 Page - STMicroelectronics |
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224 / 371 page  Obsolete Product(s) - Obsolete Product(s) On-chip peripherals ST7MC1K2-Auto, ST7MC1K6-Auto, ST7MC2S4-Auto, ST7MC2S6-Auto 224/371 Figure 98. Simulated commutation and Z event Figure 99 gives the step ratio register value (left axis) and the number of BEMF sampling during one electrical step with the corresponding accuracy on the measure (right axis) as a function of the mechanical frequency. For a given prescaler value (step ratio register) the mechanical frequency can vary between two fixed values shown on the graph as the segment ends. In autoswitched mode, this register is automatically incremented/decremented when the step frequency goes out of this segment. At fMTC = 4 MHz, the range covered by the step ratio mechanism goes from 2.39 to 235000 (pole pair x rpm) with a minimum accuracy of 1.2% on the step period. To read the number of samples for Zn within one step (right Y axis), select the mechanical frequency on the X axis and the sampling frequency curve used for BEMF detection (PWM frequency or measurement window frequency). For example, for N.Frpm = 15000 and a sampling frequency of 15 kHz, there are approximately 10 samples in one step and there is a 10% error rate on the measurement. Cs CH Z Z Z D SC bit is reset. The result D MCOMP register of the hardware multiplication is put in MCOMP-->CH and compared with MTIM once SC bit is set during Z IT. The hardware multiplication is taken into account but the value in MCOMP can be overwritten Cs Z D SC bit is already set when Z IT occurs. The hardware multiplication is not taken into account. A value has to be written in the MCOMP register. t Z D CH CS Zero-crossing event Demagnetization event Hardware commutation Simulated commutation written. Obsolete Product(s) - Obsolete Product(s) |
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