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L9966 データシート(PDF) 49 Page - STMicroelectronics |
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L9966 データシート(HTML) 49 Page - STMicroelectronics |
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49 / 122 page  11 Voltage dividers and internal signals The device implements different voltage dividers to scale the system voltage rails (UBSW, VI5V, VIX) to a suitable level for the integrated ADC1. The full range of the ADC1 is 1.25V In Table 29 the voltage divider ratios parameters are listed. The chosen voltage divider is set simply based on the voltage pin being converted, regardless of the configuration of PUP_DIV[1:0] in SC_CONF or SQNCR_CMDx registers. Table 29. Voltage dividers and internal signals electrical parameters Symbol Parameter Condition Min Typ Max Unit Pin UBSW = 7.5 V:36 V, VDD5V = 4.85 V:5.15 V, Tj-max = 150 °C unless otherwise specified. RatioBatt Voltage divider ratio to ADC1 UBSW input range 40 V 95%FR=39.22+-3.5% -3.5% 33 +3.5% V/V UBSW RatioIX Voltage divider ratio to ADC1 VIX input range 25 V 95%FR=24.95 V -3% 21 +3% V/V VIX RatioT5V Voltage divider ratio to ADC1 VI5V input range 5 V 95%FR=4.87 V -3% 4.1 +3% V/V VI5V RatioBG Voltage divider ratio to ADC1 Bandgap reference ratio Design info -3% 1.975 +3% V/V - ADC1err_UBSW ADC1 total measurement error Including all error contributions (VDD5REF excl.) UBSW input range 42 V (1LSB=10 mV) - - 144 LSB UBSW ADC1err_VIX ADC1 total measurement error Including all error contributions (VDD5REF excl.) VIX input range 27 V (1LSB=7 mV) - - 110 LSB VIX VIX_range VIX input range VIX input range 0.75 25 V VIX ADC1err_VI5V ADC1 total measurement error Including all error contributions (VDD5REF excl.) VI5V input range 5.15 V (1LSB=1.3 mV) - - 80 LSB VI5V VI5V_range VI5V input range VI5V input range 0.15 - 5 V VI5V ADC1err_BG ADC1 total measurement error Including all error contributions (VDD5REF excl.) (1LSB=0.3 mV) - - 100 LSB - RatioX Voltage divider to VIX and VTX VIX/VTX ratio -2% 5.85 +2% V/V VIX, VTX Ratio5V Voltage divider to VT5V and VT5V VI5V/VT5V ratio -1% 1.04 +1% V/V VI5V, VT5V VT5V output Divider output impedance - -50% 48k +50% Ω VT5V VTX output Divider output impedance - -45% 58k +45% Ω VTX VI5V input Divider input impedance - -50% 97k +50% Ω VI5V VIX input Divider input impedance - -45% 135k +45% Ω VIX V therm Thermal sensor voltage Design info (-40 °C) - 0.5 - V - V therm Thermal sensor voltage Design info (27 °C) - 0.65 - V - V therm Thermal sensor voltage Design info (150 °C) - 0.89 - V - To save power consumption, the voltage dividers are switched off when the device enters SLEEP or RST_ACTIVE mode. When the conversion is requested on UBSW, VI5V, VIX or VBG the proper voltage divider is automatically applied. In case the internal bandgap voltage reference is to be converted, no voltage divider is used. L9966 Voltage dividers and internal signals DS12459 - Rev 10 page 49/122 |
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