11
11-44
Rev.1.0
11.3 Functional Description of the A-D Converters
11.3.1 How to Find Analog Input Voltages
The A-D converters each use a 10-bit successive approximation method. Therefore, to find the
actual analog input voltages from the digital quantities obtained as a result of A-D conversion, use
the equation below.
The A-D converters each are comprised of 10 bits, so they provide a resolution of 1,024. Because
the voltage applied to the VREF pin constitutes the reference voltage for the A-D converter,
connect an accurate and stable, constant-voltage power supply to the VREF. Also, separate the
analog block power supply and ground (AVCC, AVSS) from those of the digital block and take a
sufficient protective measure against noise.
For details about the accuracy of conversion, see Section 11.3.5, "Accuracy of A-D Conversion."
ADiIN0
ADiIN1
ADiIN2
ADiIN3
ADiIN4
ADiIN5
ADiIN6
ADiIN7
Selector
AVSS0
VREF0
10-bit A-Di Successive
Approximation Register (ADiSAR)
10-bit A-Di Data Register
A-Di Comparate Data Register
A-D Control Circuit
10-bit D-A Converter
Comparator
ADiIN8
ADiIN9
ADiIN10
ADiIN11
ADiIN12
ADiIN13
ADiIN14
ADiIN15
AD0iCMP
AD0iDT0-15
Successive approximation method
A-D conversion unit
AVCC0
Vref
VIN
i=0, 1
Figure 11.3.1 Block Diagram of the Successive Approximation Method A-D0 Conversion Unit
A-D CONVERTERS
11.3 Functional Description of the A-D Converters
Analog input voltage [V] =
A-D conversion result x VREF input voltage [V]
1024
Содержание 32172
Страница 20: ... This is a blank page 16 ...
Страница 21: ...1 1 Overview 1 2 Block Diagram 1 3 Pin Functions 1 4 Pin Layout CHAPTER 1 CHAPTER 1 OVERVIEW ...
Страница 44: ...1 1 24 Rev 1 0 This is a blank page Overview 1 4 Pin Layout ...
Страница 58: ...2 2 14 Rev 1 0 This is a blank page CPU 2 6 Data Formats ...
Страница 122: ...4 4 26 Rev 1 0 This is a blank page EIT 4 13 Precautions on EIT ...
Страница 200: ...7 7 6 Rev 1 0 This is a blank page RESET 7 4 Precautions to Be Taken Immediately after Reset ...
Страница 240: ...8 8 40 Rev 1 0 This is a blank page INPUT OUTPUT PORTS AND PIN FUNCTIONS 8 5 Precautions on Input Output Ports ...
Страница 298: ...9 9 58 Rev 1 0 This is a blank page DMAC 9 4 Precautions on Using DMAC ...
Страница 416: ...10 10 118 Rev 1 0 This is a blank page INPUT OUTPUT TIMERS 10 6 TOM Output Related 16 bit Timers ...
Страница 658: ...14 14 16 Rev 1 0 REAL TIME DEBUGGER RTD 14 4 Typical Connection with the Host This is a blank page ...
Страница 718: ...16 16 16 Rev 1 0 This is a blank page D A CONVERTERS 16 3 Functional Description of the D A Converters ...
Страница 766: ...18 18 22 Rev 1 0 WAIT CONTROLLER 18 3 Typical Operation of the Wait Controller This is a blank page ...
Страница 776: ...19 19 10 Rev 1 0 RAM BACKUP MODE 19 4 Exiting RAM Backup Mode Wakeup This is a blank page ...
Страница 777: ...CHAPTER 20 CHAPTER 20 OSCILLATION CIRCUIT 20 1 Oscillator Circuit 20 2 Clock Generator Circuit ...
Страница 782: ...20 20 6 Rev 1 0 OSCILLATION CIRCUIT 20 2 Clock Generator Circuit This is a blank page ...
Страница 856: ...23 23 26 Rev 1 0 This is a blank page ELECTRICAL CHARACTERISTICS 23 6 AC Characteristics ...
Страница 857: ...24 1 A D Conversion Characteristics CHAPTER 24 CHAPTER 24 STANDARD CHARACTERISTICS ...
Страница 859: ...Appendix 1 1 Dimensional Outline Drawing APPENDIX 1 APPENDIX 1 MECHANICAL SPECIFICATIONS ...
Страница 861: ...Appendix 2 1 M32R E Instruction Processing Time APPENDIX 2 APPENDIX 2 INSTRUCTION PROCESSING TIME ...
Страница 865: ...Appendix 3 1 Precautions about Noise APPENDIX 3 APPENDIX 3 PRECAUTIONS ABOUT NOISE ...