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STM8的ADC工作原理
STM8 family microcontrollers include an Analog to Digital Converter of the switched-
1 STM8 ADC internal hardware
capacitor type. This ADC type uses the SAR (Successive Approximation Register) principle,
by which the conversion is performed in several steps. The number of conversion steps is
equal to the number of bits in the ADC converter.
STM8 family microcontrollers include an Analog to Digital Converter of the switched-
STM8ADC
capacitor type. This ADC type uses the SAR (Successive Approximation Register) principle,
ST Application note AN2719 STM8ADC
by which the conversion is performed in several steps. The number of conversion steps is
Charge-RedistributionCR ADCADC
equal to the number of bits in the ADC converter.
CR ADC
Figure 1 to Figure 6 show the first conversion steps.
1.1 SAR principle
Figure 1. Basic schematic of switched-capacitor ADC
Figure 1 to Figure 6 show the first conversion steps. Vref
Vin
Sa
Figure 1. Basic schematic of switched-capacitor ADC
Vref
Vin
Sa
S1 S2 S3 S4 S5 S6 S7 S8 S9
C C/2 C/4 C/8 C/16 C/32 C/64 C/128 C/128
A D PR Q ADCdata
Sb
S
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