ATxmega128A3U-MHR - E-LAB Computers

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30. AC – Analog Comparator30.1 Features• Four Analog Comparators (AC)• Selectable propagation delay versus current consumption• Selectable hysteresis• No• Small• Large• Analog comparator output available on pin• Flexible input selection• All pins on the port• Output from the DAC• Bandgap reference voltage• A 64-level programmable voltage scaler of the internal V CC voltage• Interrupt and event generation on:• Rising edge• Falling edge• Toggle• Window function interrupt and event generation on:• Signal above window• Signal inside window• Signal below window• Constant current source with configurable output pin selection30.2 OverviewThe analog comparator (AC) compares the voltage levels on two inputs and gives a digital output based on thiscomparison. The analog comparator may be configured to generate interrupt requests and/or events upon severaldifferent combinations of input change.Two important properties of the analog comparator’s dynamic behavior are: hysteresis and propagation delay. Both ofthese parameters may be adjusted in order to achieve the optimal operation for each application.The input selection includes analog port pins, several internal signals, and a 64-level programmable voltage scaler. Theanalog comparator output state can also be output on a pin for use by external devices.A constant current source can be enabled and output on a selectable pin. This can be used to replace, for example,external resistors used to charge capacitors in capacitive touch sensing applications.The analog comparators are always grouped in pairs on each port. These are called analog comparator 0 (AC0) andanalog comparator 1 (AC1). They have identical behavior, but separate control registers. Used as pair, they can be set inwindow mode to compare a signal to a voltage range instead of a voltage level.PORTA and PORTB each has one AC pair. Notations are ACA and ACB, respectively.XMEGA A3U [DATASHEET]8386C–AVR–02/201350
Figure 30-1. Analog comparator overview.Pin Input+AC0OUTPin InputDACVoltageScalerBandgapPin InputACnMUXCTRL-+EnableACnCTRLEnableHysteresisInterruptModeHysteresisWINCTRLInterruptSensititivityControl&WindowFunctionInterruptsEventsAC1OUT-Pin InputThe window function is realized by connecting the external inputs of the two analog comparators in a pair as shown inFigure 30-2.Figure 30-2. Analog comparator window function.+Upper limit of windowInput signal-AC0InterruptsensitivitycontrolInterruptsEventsLower limit of window+-AC1XMEGA A3U [DATASHEET]8386C–AVR–02/201351
Page 1 and 2: Features8/16-bit Atmel XMEGA A3U Mi
Page 4 and 5: 3. OverviewThe Atmel AVR XMEGA is a
Page 6 and 7: 4. ResourcesA comprehensive set of
Page 8 and 9: The arithmetic logic unit (ALU) sup
Page 10 and 11: Six of the 32 registers can be used
Page 12 and 13: 7.3.4 Production Signature RowThe p
Page 14 and 15: 7.8 Data Memory and Bus Arbitration
Page 16 and 17: 8. DMAC - Direct Memory Access Cont
Page 18 and 19: Figure 9-1.Event system overview an
Page 20 and 21: Figure 10-1. The clock system, cloc
Page 22 and 23: 11. Power Management and Sleep Mode
Page 24 and 25: 12. System Control and Reset12.1 Fe
Page 26 and 27: 13. WDT - Watchdog Timer13.1 Featur
Page 28 and 29: Program address(base address) Sourc
Page 30 and 31: 15.3.1 Push-pullFigure 15-1. I/O co
Page 32 and 33: 15.4 Input sensingInput sensing is
Page 34 and 35: Only Timer/Counter 0 has the split
Page 36 and 37: 18. AWeX - Advanced Waveform Extens
Page 38 and 39: 20. RTC - 16-bit Real-Time Counter2
Page 40 and 41: Multipacket transfer enables a data
Page 42 and 43: 23. SPI - Serial Peripheral Interfa
Page 44 and 45: 25. IRCOM - IR Communication Module
Page 46 and 47: 28. ADC - 12-bit Analog to Digital
Page 48 and 49: 29. DAC - 12-bit Digital to Analog
Page 52 and 53: 31. Programming and Debugging31.1 F
Page 54 and 55: TXDnSSMOSIMISOSCKTransmitter Data f
Page 56 and 57: Table 32-3.Port C - alternate funct
Page 58 and 59: 33. Peripheral Module Address MapTh
Page 60 and 61: 34. Instruction Set SummaryMnemonic
Page 63 and 64: Mnemonics Operands Description Oper
Page 65 and 66: 35. Packaging information35.1 64API
Page 67 and 68: 36. Electrical CharacteristicsAll t
Page 69 and 70: 36.1.3 Current consumptionTable 36-
Page 71 and 72: 36.1.4 Wake-up time from sleep mode
Page 77 and 78: Symbol Parameter Condition Min. Typ
Page 79 and 80: Table 36-21. Programming time.Symbo
Page 81 and 82: t CRV IH1V IL1t CLt CK36.1.14.6 Ext
Page 85 and 86: 36.1.15 SPI CharacteristicsFigure 3
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Page 91 and 92: 36.2.3 Current consumptionTable 36-
Page 93 and 94: 36.2.4 Wake-up time from sleep mode
Page 95 and 96: 36.2.6 ADC characteristicsTable 36-
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Table 36-53. Programming time.Symbo
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t CRV IH1V IL1t CLt CK36.2.14.6 Ext
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Symbol Parameter Condition Min. Typ
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36.2.15 SPI CharacteristicsFigure 3
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36.2.16 Two-Wire Interface Characte
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36.3 ATxmega192A3U36.3.1 Absolute M
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36.3.3 Current consumptionTable 36-
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36.3.4 Wake-up time from sleep mode
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36.3.6 ADC characteristicsTable 36-
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Table 36-85. Programming time.Symbo
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36.4 ATxmega256A3U36.4.1 Absolute M
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36.4.3 Current consumptionTable 36-
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36.4.4 Wake-up time from sleep mode
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36.4.6 ADC characteristicsTable 36-
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Table 36-117.Programming time.Symbo
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37. Typical Characteristics37.1 ATx
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Figure 37-5. Active mode supply cur
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Figure 37-9. Idle mode supply curre
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Figure 37-13. Idle mode supply curr
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37.1.1.4 Power-save mode supply cur
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Figure 37-21. I/O pin pull-up resis
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Figure 37-25. I/O pin output voltag
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Figure 37-29. I/O pin output voltag
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Figure 37-33. I/O pin input thresho
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Figure 37-37. INL error vs. input c
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Figure 37-41. Gain error vs. V REF
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Figure 37-45. Offset error vs. V CC
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Figure 37-49. DNL error vs. V REF .
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Figure 37-53. Analog comparator hys
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Figure 37-57. Voltage scaler INL vs
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37.1.8 External Reset Characteristi
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Figure 37-65. Reset pin input thres
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37.1.10 Oscillator Characteristics3
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Figure 37-72. 2MHz internal oscilla
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Figure 37-76. 32MHz internal oscill
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37.2 ATxmega128A3U37.2.1 Current co
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Figure 37-88. Active mode supply cu
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Figure 37-104. I/O pin pull-up resi
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Figure 37-108. I/O pin output volta
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Figure 37-116. I/O pin input thresh
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Figure 37-120. INL error vs. input
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Figure 37-128. Offset error vs. V C
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Figure 37-132. DNL error vs. V REF
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Figure 37-136. Analog comparator hy
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Figure 37-140. Voltage scaler INL v
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Figure 37-148. Reset pin input thre
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Figure 37-159. 32MHz internal oscil
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Figure 37-171. Active mode supply c
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Figure 37-175. Idle mode supply cur
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Figure 37-254. Active mode supply c
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38. Errata38.1 ATxmega64A3U, ATxmeg
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39.3 8386A - 07/20111. Initial revi
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11. Power Management and Sleep Mode
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36.4 ATxmega256A3U . . . . . . . .
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