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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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L9300 датащи(PDF) 66 Page - STMicroelectronics |
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L9300 датащи(HTML) 66 Page - STMicroelectronics |
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66 / 178 page  Figure 39. Pump PWM programming T0 = 62.5 ns Prescaler Tref = T0 * (PUMP_PWM_PERIOD +1) PUMP_PWM_PERIOD PUMP_PWM_Duty_Cycle PWM Period = 100 * Tref PWM duty cycle = PUMP_PWM_Duty_Cycle 100/128 PWMsynthesis GADG0308171556PS The PUMP_PWM_PERIOD register can be programmed from 8 to 255, with the following relation: • If PUMP_PWM_PERIOD < 8 → Tref = 9 * T0 • If PUMP_PWM_PERIOD ≥ 8 → Tref = (PUMP_TCK_PGM + 1) * T0 The table below shows the PUMP_T_PWM relation. Table 40. Pump PWM frequency decoding PUMP_PWM_PERIOD PWM Period [µs] PWM Frequency [kHz] 0 56,25 17,777 1 56,25 17,777 … … … 7 56,25 17,777 8 56,25 17,777 9 62,50 16,000 10 68,75 14,545 … … … 255 1600,00 0,625 The PUMP_PWM_Duty_Cycle register can be programmed from 0 to 255, with the following relation: • If PUMP_PWM_DUTY_CYCLE < 128 → PWM duty cycle = PUMP_PWM_DUTY_CYCLE * 100/128 [%] • If PUMP_PWM_DUTY_CYCLE ≥ 128 → PWM duty cycle = 100 [%] The following table explains the duty cycle programming. Table 41. Pump PWM duty cycle decoding PUMP_PWM_Duty_Cycle Duty cycle 0 0,000 % 1 0,781 % 2 1,562 % … … 20 15,625 % … … 60 46,875 % L9300 Valve drivers DS12258 - Rev 5 page 66/178 |
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