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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PFS122 датащи(PDF) 60 Page - PADAUK Technology. |
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PFS122 датащи(HTML) 60 Page - PADAUK Technology. |
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60 / 93 page  PFS122 8bit MTP MCU with 12-bit R-Type ADC ©Copyright 2020, PADAUK Technology Co. Ltd Page 60 of 93 PDK-DS-PFS122-EN_V000-May 28, 2020 Data$0 = ADCRL; Data = Data >> 4; The ADC can be disabled by using the following method: $ ADCC Disable; or ADCC = 0; 5.13.5 How to calculate ADC input voltage VIN For PFS122, only VDD but not 1.2V bandgap voltage can be selected as the VREF of the ADC. When VDD is not regulated, users have to use the reading of 1.2V bandgap voltage to deduce the input voltage (VIN) by the ratio of the readings. The principle is as below: VBG / VDD = NBG / 4096 ....(1) VIN / VDD = NIN / 4096 ....(2) Where VIN is the analog input voltage VBG is the 1.2V bandgap voltage NIN is the corresponding ADC reading of VIN NBG is the corresponding ADC reading of VBG VDD is the VDD at the measuring instant 4096 is the full swing reading when VIN=VDD (12bit: 2 12 = 4096) (2)/(1) we get VIN/VBG = NIN/NBG And so VIN = NIN / NBG *VBG It means users can firstly get the readings for VIN and VBG respectively in a very short period that VDD remains unchanged. And then use multiplication and division program module or use look-up table method to finally get the VIN voltage. If necessary, please contact FAE for demo code reference. |
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