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L9300 数据表(PDF) 49 Page - STMicroelectronics |
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L9300 数据表(HTML) 49 Page - STMicroelectronics |
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49 / 178 page  Figure 27. High–side and low–side configuration HS LS VSx LOADx RETURNx VBATP HS LS LOADx RETURNx VBATP drivers control & Current driver HS pre- PD2S PD2G VSx drivers control & Current driver HS pre- PD2S PD2G High-side configuration Low-side configuration GADG1807170920PS If CONFIG pin is set to high, solenoid activation depends also on the Q&A WD status as described in Section 14.1.2: Watchdog states evolution. The solenoid drivers can work in two different configurations selectable by SW_cntr_x bit (default =0): hardware mode when the current flowing in the load is controlled by internal control loop or software mode where the loop is closed by external microcontroller and the driver is actuated through INx pins. The following parameters can be configured only when the solenoid driver is not active: • HS-LS configuration • Software/Hardware Current Control Feedback • Operating Current Range • Overcurrent Threshold The following parameters can be modified during channel operation: • Current Set Point (HW mode only) • Switching Period (HW mode only) • Dither (HW mode only) • Control Loop parameters (HW mode only) • Full on mode (HW mode only) • Slew Rate Control 10.1.1.1 Hardware current control In this case, SW_cntr_x = 0, the device needs to receive the target of the load current from the microcontroller through SPI together with the target switching frequency. Once the channel is enabled the device starts to drive in PWM mode the drivers (HS & LS) adjusting consequently the duty cycle to reach the target load current. The switching frequency and the regulated current can be programmed separately for each channel. The device offers the possibility to synchronize the turning on of all the channels by writing to 1 all the corresponding bits in the enable register. L9300 Valve drivers DS12258 - Rev 5 page 49/178 |
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