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SH79F6489P/080PR Datasheet(PDF) 107 Page - SINOWEALTH Electronic Ltd |
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SH79F6489P/080PR Datasheet(HTML) 107 Page - SINOWEALTH Electronic Ltd |
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107 / 152 page  SH79F6488/SH79F6489 107 Table 8.29 AD Converter Data Register 91H Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 ADDL - - - - A3 A2 A1 A0 R/W - - - - R R R R Reset Value (POR/WDT/LVR/PIN) - - - - 0 0 0 0 96H Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 ADDM A11 A10 A9 A8 A7 A6 A5 A4 R/W R R R R R R R R Reset Value (POR/WDT/LVR/PIN) 0 0 0 0 0 0 0 0 97H Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 ADDH A19 A18 A17 A16 A15 A14 A13 A12 R/W R R R R R R R R Reset Value (POR/WDT/LVR/PIN) 0 0 0 0 0 0 0 0 Bit Number Bit Mnemonic Description 19-0 A19-A0 20-bit ADC data register Note: (1) ADC conversion result is stored in A19-A0. The A19 is the sign bit of ADC data. Refer to the following formula to calculate ADC conversion data value: ADC data = ((VIN+) - (VIN-))/VREF X 524288 If ADCDF = 0, ADC output data is bipolar mode (complement) When (VIN+) > (VIN-) is positive, A19 is 0 which means the ADC data is positive. The ADC value is A19-A0; When (VIN+) < (VIN-) is negative, A19 is 1 which means the ADC data is negative. The ADC value is 100000H minus A19-A0. If ADCDF = 1, ADC output data is unipolar mode When (VIN+) = (VIN-) , ADC data = 80000H; When (VIN+) > (VIN-) , ADC data > 80000H; When (VIN+) < (VIN-) , ADC data < 80000H; (2) Due to the zero offset voltage ADC or PGA, actual output will has certain error code value. (3) When the ADC conversion is complete, the data register will not be updated. (4) To obtain maximum range of ADC output, the maximum absolute of ADC input voltage of ((VIN+) - (VIN-)) should be close to reference voltage value, bit can’t over the reference voltage value. |
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