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ST7MC1K2 数据表(PDF) 202 Page - STMicroelectronics |
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ST7MC1K2 数据表(HTML) 202 Page - STMicroelectronics |
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202 / 371 page  Obsolete Product(s) - Obsolete Product(s) On-chip peripherals ST7MC1K2-Auto, ST7MC1K6-Auto, ST7MC2S4-Auto, ST7MC2S6-Auto 202/371 Figure 84. Protection of ZH event detection 1. Preload bit, new value taken into account at the next C event (in normal mode) or when a value is written in the MPHST register when in direct access mode. For more details refer to the description of the DAC bit in Control register A (MCRA) on page 265. The use of a preload register allows all the registers to be updated at the same time Position sensor mode In position sensor mode (SR = 1 in MCRA register), the rotor position information is given to the peripheral by means of logical data on the three inputs MCIA, MCIB and MCIC (hall sensors). For each step one of these three inputs is selected (IS[1:0] bits in register MPHST) in order to detect the Z event. Be careful that the phase comparator is OFF until CKE and /or DAC bits are set in MCRA register. In sensor mode, demagnetization and the related features (such as the special PWM configuration, DS or DH management, programmable filter) are not available (see Table 90). In sensor mode configuration the rotor detection does not need a particular phase configuration to perform the measurement and a Z event can be read from any detection window. The sampling is done at a selectable frequency (fSCF) (see Table 166). This means that Z event position sensoring is more precise than it is in sensorless mode. Table 90. Demagnetization access SR bit MCRA register Demagnetization feature availability 1No 0Yes + - D CP S Q Q R D CP S Q Q R D CP S Q Q R V I F D Rz Sampling clock Current sample Previous sample Phase comparator Falling/rising edge MPOL register CPB(1) bit Direct/filter PZ MCRA register bit 1 ZVD bit Fz Instantaneous edge Z C Fz CRz C Fz Rz Commutation event Rising edge zero-crossing Falling edge zero-crossing Current mode Voltage mode I V MCRB register Obsolete Product(s) - Obsolete Product(s) |
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