Figure 4. Step 1: Compare With Vref/2; Figure 5. Step 2: If Msb = 0, Then Compare With ¼Vref - ST STM32 Application Note

ADC internal principle
1. First approximation step. S1 switched to V
1. Compare with ¼V
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Figure 4. Step 1: Compare with V
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Figure 5. Step 2: If MSB = 0, then compare with ¼V
; if MSB =1. S1 switched back to ground. S2 switched to V
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