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15 / 29 page  DocID15255 Rev 2 15/29 AN2859 Detection windows digital value setting 29 4 Detection windows digital value setting To detect the state of both AC switches, an MCU analog/digital converter input (ADC) should be used. The conversion result (NADC) of the VSTATE signal depends on the ADC size (N) and of the MCU voltage reference (VRef). Note that the ADC transfer function is considered as ideal (see Equation 17). Equation 17 According to the state of the AC switches, the VSTATE signal is not directly dependent on the value of VCC (see equations 1, 2 and 3). This has an impact on the conversion result if the voltage reference of the ADC transfer function depends directly on VCC. In this case, the detection levels to implement in the MCU firmware should be determined by taking into account the DC power supply variation with VREF = VCC (see equations 18, 19, 20, 21, 22, 23 and 24). Equation 18 ASC1 is on and ACS2 is on. Equation 19 ASC1 is on and ACS2 is on. Equation 20 ASC1 is on and ACS2 is off. N Ref V STATE ADC 2 · V N = ⎪ ⎪ ⎪ ⎪ ⎪ ⎩ ⎪ ⎪ ⎪ ⎪ ⎪ ⎨ ⎧ = ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + = ⇒ ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + = ⇒ N R_Min R_Max CC_Min AVF_L_Max N R_Min 4 2 R_Max 4 2 CC_Min AVF_L_Max 0_Max N 4 2 4 2 CC AVF_L 0 2 · X X · V V 2 · X · R R X · R R · V V N 2 · R R R R · V V N 0 N 0_Min = ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎩ ⎪⎪ ⎪ ⎪ ⎪ ⎪ ⎨ ⎧ ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + + ⎥ ⎥ ⎥ ⎥ ⎦ ⎤ ⎢ ⎢ ⎢ ⎢ ⎣ ⎡ ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + + = ⇒ ⎥ ⎥ ⎥ ⎥ ⎦ ⎤ ⎢ ⎢ ⎢ ⎢ ⎣ ⎡ ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + + ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + + = ⇒ R_Min 4 2 1 R_Max N CC_Min 2 1 AVF_L_Max 4 1_Max N 4 2 1 CC 2 1 AVF_L CC 4 1 X · R R R X · 2 · V R R · V R N 2 · R R R · V R R · V V · R N |
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