11
11-41
Ver.0.10
11.3 Functional Description of A-D Converters
11.3.1 How to Find Along Input Voltages
The A-D converters use a 10-bit successive approximation method, and find the actual analog input
voltage from the value (digital quantity) obtained through execution of A-D conversion by
performing the following calculation.
The A-D converters are a 10-bit converter, providing a resolution of 1,024 discrete voltage levels.
Because the reference voltage for the A-D converter is the voltage applied to the VREF pin, make
sure an exact and stable constant-voltage power supply is connected to VREF. Also, make sure the
analog circuit power supply and ground (AVCC, AVSS) are separated from those of the digital
circuit, with sufficient noise prevention measures incorporated.
For details about the conversion accuracy, refer to Section 11.3.5, "Accuracy of A-D Conversion."
Analog input voltage [V] =
Figure 11.3.1 Outline Block Diagram of the Successive Approximation-type A-D Converter Unit
A-D conversion result x VREF input voltage [V]
1024
A-D CONVERTERS
11.3 Functional Description of A-D Converters
ADiIN0
ADiIN1
ADiIN2
ADiIN3
ADiIN4
ADiIN5
ADiIN6
ADiIN7
Selector
AVSSi
VREFi
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 A-D converter
Comparator
ADiIN8
ADiIN9
ADiIN10
ADiIN11
ADiIN12
ADiIN13
ADiIN14
ADiIN15
ADiCMP
ADiDT0-15
Successive approximation-type
A-D converter unit
AVCCi
Vref
VIN
i=0, 1
Содержание M32170F3VFP
Страница 19: ...CHAPTER 1 CHAPTER 1 OVERVIEW 1 1 Outline of the 32170 1 2 Block Diagram 1 3 Pin Function 1 4 Pin Layout ...
Страница 42: ...1 1 24 Ver 0 10 OVERVIEW 1 4 Pin Layout This is a blank page ...
Страница 56: ...2 2 14 Ver 0 10 This is a blank page ...
Страница 88: ...3 3 32 Ver 0 10 ADDRESS SPACE 3 7 Notes on Address Space This is a blank page ...
Страница 192: ...6 6 58 Ver 0 10 INTERNAL MEMORY 6 9 Precautions to Be Taken When Rewriting Flash Memory This is a blank page ...
Страница 270: ...9 9 40 Ver 0 10 DMAC 9 4 Precautions about the DMAC This is a blank page ...
Страница 498: ...10 10 228 Ver 0 10 MULTIJUNCTION TIMERS 10 9 TOM Output related 16 bit Timer This is a blank page ...
Страница 550: ...11 11 52 Ver 0 10 A D CONVERTERS 11 4 Precautions on Using A D Converters This is a blank page ...
Страница 614: ...12 12 64 Ver 0 10 This is a blank page SERIAL I O 12 9 Precautions on Using UART Mode ...
Страница 710: ...14 14 16 Ver 0 10 REAL TIME DEBUGGER RTD 14 4 Typical Connection with the Host This is a blank page ...
Страница 746: ...16 16 20 Ver 0 10 WAIT CONTROLLER 16 3 Typical Operation of the Wait Controller This is a blank page ...
Страница 756: ...17 17 10 Ver 0 10 RAM BACKUP MODE 17 4 Exiting RAM Backup Mode Wakeup This is a blank page ...
Страница 757: ...CHAPTER 18 CHAPTER 18 OSCILLATION CIRCUIT 18 1 Oscillator Circuit 18 2 Clock Generator Circuit ...
Страница 762: ...18 18 6 Ver 0 10 OSCILLATION CIRCUIT 18 2 Clock Generator Circuit This is a blank page ...
Страница 798: ...19 19 36 Ver 0 10 JTAG 19 6 Precautions about Board Design when Connecting JTAG This is a blank page ...
Страница 830: ...21 21 24 Ver 0 10 PRELIMINARY PRELIMINARY This is a blank page ELECTRICAL CHARACTERISTICS 21 5 AC Characteristics ...
Страница 831: ...CHAPTER 22 CHAPTER 22 TYPICAL CHARACTERISTICS 22 1 A D Conversion Characteristics ...
Страница 833: ...Appendix 1 1 Dimensional Outline Drawing APPENDIX 1 APPENDIX 1 MECHANICAL SPECIFICATIONS ...
Страница 837: ...Appendix 2 1 32170 Instruction Processing Time APPENDIX 2 APPENDIX 2 INSTRUCTION PROCESSING TIME ...
Страница 841: ...Appendix 3 1 Precautions about Noise APPENDIX 3 APPENDIX 3 PRECAUTIONS ABOUT NOISE ...