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L9305 データシート(PDF) 27 Page - STMicroelectronics |
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L9305 データシート(HTML) 27 Page - STMicroelectronics |
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27 / 107 page  EN_DR Driver configuration status Channel status [1] [0] HIGH 1 0 Driver ON in PWM mode,Off Diagnosis disabled and Masked HIGH 1 1 Driver ON in Full ON mode,Off Diagnosis disabled and Masked Disabled Mode: Driver is kept disabled. No supply is present onto the driver; off diagnosis is masked and cannot be enabled. Tristate Mode: Driver is supplied and kept in Tristate: Hi impedance. Off state diagnostics (Channel_x.Configuration) can be enabled. PWM Mode: Driver is supplied and on. Off state diagnostics are masked. Load is driven by the PWM signal applied to the INx pin. Depending on the selected configuration (HS or LS mode), the INx polarity is defined as follows: Table 13. INx polarity Driver Configuration Driver Status INx Pin Status HIGH LOW LOW Side (load connected between VS_SOLx pin and LOAD_SOLx pin) Low side FET ON OFF High side FET OFF ON HIGH Side (load connected between LOAD_SOLx pin and GND_SOLx pin) Low side FET OFF ON High side FET ON OFF FULL_ON Mode: Driver is supplied and in FULL_ON mode. In this condition, the driver is kept on continuously, until the FULL_ON mode is removed or a fault occurs. 6.3 Solenoid current control feedback 6.3.1 Average current The solenoid current, as a result of internal current sensing, calibration correction and final average calculation over an entire PWM period, is available for SPI reading from Channel_x.AVGCUR register. Independent of HW or SW mode current control selection, the average current calculation cycle starts at each PWM switch ON event and ends at the next PWM switch ON event. The average current calculated is immediately available to the SPI output register through the dedicated 14-bit field in SPI register Channel_x.AVGCUR. • HILOAD = 0 → Normal current mode - Single bit resolution = 0.25 [mA] AverageCurrent=2ComplemetAvgCur13:0 *0.25mA • HILOAD = 1 → High current mode - Single bit resolution = 0.33 [mA] AverageCurrent=2ComplemetAvgCur13:0 *0.33mA In case the Driver input signal is stuck high or low for a time period longer than Tpwm_max, the TMOUT warning flag is set in Channel_x.PWMSENSE register and the average current is evaluated only for Tpwm_max. After timeout, the average current and PWM code calculations restart automatically. When CHx.SETPOINT=0000 and channel x is controlled Hardware mode (CONFIGURATION1.D[2]=0), then the current measurement is disabled and AVGCUR always returns all ‘0’, even if channel x is driven full-on. 6.3.2 Integrator feedback The current integrator output values are important feedback for proper selection of many control parameters. The device provides integrator feedback through the Channel_x.INTOUT register. The content of Channel_x.INTOUT register is determined in the Channel_x.INTGLIM register bits D[15:14]. The integrator feedback definition is defined below: L9305 Current control drivers DS12774 - Rev 10 page 27/107 |
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