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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PFS172 датащи(PDF) 39 Page - PADAUK Technology. |
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PFS172 датащи(HTML) 39 Page - PADAUK Technology. |
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39 / 92 page  PFS172 8bit MTP MCU with 8-bit ADC ©Copyright 2020, PADAUK Technology Co. Ltd Page 39 of 92 PDK-DS-PFS172-EN_V000-May 8, 2020 5.5.3 Using the comparator and bandgap 1.20V The internal bandgap module can provide 1.20 volt, it can measure the external supply voltage level. The bandgap 1.20 volt is selected as minus input of comparator and Vinternal R is selected as plus input. The supply voltage of Vinternal R is VDD, and the VDD voltage level can be detected by adjusting the voltage level of Vinternal R to compare with bandgap. If N (gpcs[3:0] in decimal) is the number to let Vinternal R closest to bandgap 1.20 volt, the supply voltage VDD can be calculated by using the following equations: For using Case 1: VDD = [ 32 / (N+9) ] * 1.20 volt ; For using Case 2: VDD = [ 24 / (N+1) ] * 1.20 volt ; For using Case 3: VDD = [ 40 / (N+9) ] * 1.20 volt ; For using Case 4: VDD = [ 32 / (N+1) ] * 1.20 volt ; Case 1: $ GPCS VDD*12/40; // 4.0V * 12/40 = 1.2V $ GPCC Enable, BANDGAP, P_R; // - input: BANDGAP, + input: P_R( Vinternal R) …. if (GPC _Out) // or GPCC.6 { // when VDD﹥4V } else { // when VDD﹤4V } |
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