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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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ST7LUS5 Datasheet(PDF) 76 Page - STMicroelectronics |
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ST7LUS5 Datasheet(HTML) 76 Page - STMicroelectronics |
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76 / 124 page  On-chip peripherals ST7LUS5, ST7LU05, ST7LU09 76/124 10.3.3 Functional description Analog power supply VDDA and VSSA are the high and low level reference voltage pins. In some devices (refer to device pin out description) they are internally connected to the VDD and VSS pins. Conversion accuracy may therefore be impacted by voltage drops and noise in the event of heavily loaded or badly decoupled power supply lines. Figure 34. ADC block diagram Digital A/D conversion result The conversion is monotonic, meaning that the result never decreases if the analog input does not and never increases if the analog input does not. If the input voltage (VAIN) is greater than VDDA (high-level voltage reference) then the conversion result is FFh in the ADCDRH register and 03h in the ADCDRL register (without overflow indication). If the input voltage (VAIN) is lower than VSSA (low-level voltage reference) then the conversion result in the ADCDRH and ADCDRL registers is 00 00h. The A/D converter is linear and the digital result of the conversion is stored in the ADCDRH and ADCDRL registers. The accuracy of the conversion is described in the Chapter 12: Electrical characteristics. CH2 CH1 EOC SPEED ADON 0 CH0 ADCCSR AIN0 AIN1 ANALOG TO DIGITAL CONVERTER AINx ANALOG MUX D4 D3 D5 D9 D8 D7 D6 D2 ADCDRH 3 D1 D0 ADCDRL 00 0 0 SLOW 0 0 RADC CADC HOLD CONTROL fADC fCPU 0 1 1 0 DIV 2 DIV 4 SLOW bit |
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