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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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L9924L датащи(PDF) 67 Page - STMicroelectronics |
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L9924L датащи(HTML) 67 Page - STMicroelectronics |
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67 / 84 page  DocID028840 Rev 3 67/84 L9924L SPI interface 83 RotorSpeedrpm = 240 / (6 * 208 * 64 µs) ˜= 3004 rpm The following table shows the RPM ranges corresponding to different pole pairs values: The maximum RPM values don’t correspond to the minimum value of the register (1) but to the 64 µsec timer resolution: it can be considered a sort of 15.625 kHz sampling rate thus giving a maximum input signal frequency of roughly 8.3 kHz. Incoming phase signal with a frequency under the specified minimum values lead to a timeout condition, incoming phase signal with a frequency above the specified maximum values lead to wrong results. 12.4.8 WATCHDOG / THERMAL SHUTDOWN RESET COUNT register [0x14] Any reset event triggered by the watch dog or by the thermal shutdown circuitry increment a counter in this register. If needed, at system boot the SW can read the register to know the system history. Table 48. RPM ranges corresponding to different pole pairs values Pole pairs Rotor speed - RPM 2x Ratio Motor speed - RPM 3x Ratio Motor speed - RPM min max min max min max 4 458 117187 229 58593 153 39062 5 366 93750 183 46875 122 31250 6 305 78125 152 39062 102 26041 7 262 66964 131 33482 87 22321 8 229 58593 114 29296 76 19531 9 204 52083 102 26041 68 17361 10 183 46875 91 23437 61 15625 Table 49. WATCHDOG / THERMAL SHUTDOWN RESET COUNT register [0x14] Bit Register name Reset value Description 13-12 Reserved - - 10-8 THERMAL_SHUTDOWN_EVENTS_COUNT 0 (RC) Thermal shutdown reset counter 7-5 Reserved - - 4 TURBO_MODE 0 (RO) When set, this bit notifies that the Smart Power has detected the turbo-mode configuration 3-0 WDG_uC_RESET_EVENTS_COUNT 0 (RC) Watch dog reset counter |
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