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L9908 数据表(PDF) 74 Page - STMicroelectronics |
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L9908 数据表(HTML) 74 Page - STMicroelectronics |
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74 / 152 page  Symbol Parameter Test Condition Min Typ Max Unit Notes CSMn_IN_RANGE_CFG = 101 -6 6 Current Monitor Input Dynamic Characteristics CM_in_gain_toggling CM CSA transition time gain toggling - - 26 - Tclk Application Information CM_in_overload_recovery Overload Recovery Time - - 36 - Tclk Application Information CM_in_sr CM ADC sample rate - - 20 - MHz Application information CM_in_rise_fall_sr CM Input Differential Rise/Fall Time trise, tfall 16 - - Tclk Application Information CM_in_pulse_sr CM Input Differential Slew Rate (V2 - V1)/tpulse - - 1LSB/ Tclk mV/ μs Application Information CM_in_pulse_time CM Input Differential pulse length tpulse TSYNC + 10Tclk - - μs Application Information 1. Offset free differential input range. 2. VIN may exceed CM_in_range_diff up to the absolute maximum ratings. However, it will saturate the A/D dynamic range. 3. Ex. 1 • CSMn_IN_RANGE_CFG:011 → CM_in_range_diff = ±90 mV • FSR = 180 mV • |ISn+ - ISn-| = 20 mV → ±20 mV*2% = ±0.4 mV Ex.2 • CSMn_IN_RANGE_CFG:100 → CM_in_range_diff = ±160 mV • FSR = 320 mV • |ISn+ - ISn-| = 150 mV → ±150 mV*2% = ±3 mV 4. ADC conversion total error can be retrieved for each differential input range as follows: • CM_in_total_error = CM_in_gain_err + CM_in_offset_err • Ex1 – CM_in_range_diff = ±90 mV – |ISn+ - ISn-| = 70 mV Total ADC conversion error = ±2 mV ± (2%*70 mV) = ±2 mV ±1.4 mV. The value read by SPI will range between 70 mV-(2 mV + 1.4 mV) and 70 mV + (2 mV + 1.4 mV), which is 70 mV ± 34LSB. i.e. CSn_READ = 0x2B7 ± 0x22 Figure 47. Current Monitor input dynamic timings L9908 Functional description DS13546 - Rev 5 page 74/152 |
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