ATD Characteristics, Source Resistance | Motorola MC9S12DB128B

MC9S12DT128B Device User Guide — V01.07

A.2 ATD Characteristics

This section describes the characteristics of the analog to digital converter.

A.2.1 ATD Operating Characteristics

The Table A-8shows conditions under which the ATD operates.

The following constraints exist to obtain full-scale, full range results:

VSSA ≤ VRL ≤ VIN ≤ VRH ≤ VDDA. This constraint exists since the sample buffer amplifier can not drive beyond the power supply levels that it ties to. If the input level goes outside of this range it will effectively be clipped.

Table A-8 ATD Operating Characteristics

Conditions are shown in Table A-4unless otherwise noted

Num	C	Rating	Symbol	Min	Typ	Max	Unit

		Reference Potential	VRL	VSSA		VDDA/2	V
1	D	Low	VRL	VSSA		VDDA/2	V
		High	VRH	VDDA/2		VDDA	V
2	C	Differential Reference Voltage1	VRH-VRL	4.50	5.00	5.25	V
3	D	ATD Clock Frequency	fATDCLK	0.5		2.0	MHz
		ATD 10-Bit Conversion Period
4	D	Clock Cycles2	NCONV10	14		28	Cycles
		Conv, Time at 2.0MHz ATD Clock fATDCLK	T	7		14	μs
			CONV10
		ATD 8-Bit Conversion Period
5	D	Clock Cycles(2)	NCONV8	12		26	Cycles
		Conv, Time at 2.0MHz ATD Clock fATDCLK	TCONV8	6		13	μs
6	D	Stop Recovery Time (VDDA=5.0 Volts)	tSR			20	μs
7	P	Reference Supply current (Both ATD modules on)	IREF			0.75	mA
8	P	Reference Supply current (Only one ATD module on)	IREF			0.375	mA

NOTES:

1.Full accuracy is not guaranteed when differential voltage is less than 4.50V

2.The minimum time assumes a final sample period of 2 ATD clocks cycles while the maximum time assumes a final sample period of 16 ATD clocks.

A.2.2 Factors influencing accuracy

Three factors – source resistance, source capacitance and current injection – have an influence on the accuracy of the ATD.

A.2.2.1 Source Resistance:

Due to the input pin leakage current as specified in Table A-6in conjunction with the source resistance there will be a voltage drop from the signal source to the ATD input. The maximum source resistance RS

93

http://www.xinpian.net

提供单片机解密、IC解密、芯片解密业务 010-62245566 13810019655

Image 93

Motorola MC9S12DB128B ATD Characteristics, ATD Operating Characteristics, Factors influencing accuracy, Source Resistance

Contents

Original Release Date 18 June Revised 16 Aug Motorola, Inc Revision History Table of Contents MC9S12DT128B Device User Guide System Clock Description Resets and InterruptsModes of Operation HCS12 Core Block Description Clock and Reset Generator CRG Block Description Appendix B Package Information MC9S12DT128B Device User Guide Order Partnumber Example List of Figures MC9S12DT128B Device User Guide List of Tables MC9S12DT128B Device User Guide Preface Derivative Differences1Modules MC9S12DT128B MC9S12DG128B MC9S12DJ128B MC9S12DB128B User Guide Version Document Order Number Document References Features IntroductionOverview MC9S12DT128B Device User Guide Modes of Operation 1shows a block diagram of the MC9S12DT128B device Block Diagram MC9S12DT128B Block Diagram Device Memory Map Device Memory MapAddress Module Size Bytes Core MEMSIZ, IRQ, Hprio MC9S12DT128B Memory Map Detailed Register Map $0000 $000F Mebi map 1 of 3 Core User Guide$0010 $0014 MMC map 1 of 4 Core User Guide $0017 $0017 MMC map 2 of 4 Core User Guide $0015 $0016 INT map 1 of 2 Core User Guide$001E $001E Mebi map 2 of 3 Core User Guide $001F $001F INT map 2 of 2 Core User Guide $0028 $002F BKP Core User Guide $0020 $0027Reserved$0030 $0031 MMC map 4 of 4 Core User Guide $0032 $0033 Mebi map 3 of 3 Core User Guide $0040 $007F ECT Enhanced Capture Timer 16 Bit 8 Channels $0034 $003F CRG Clock and Reset Generator EDG7A EDG6B EDG6A EDG5B EDG5A EDG4B EDG4A TCTL3TCTL4 EDG3A EDG2B EDG2A EDG1B EDG1A EDG0B EDG0A Mczi Modmc Rdmcl Mcen MCPR1 MCPR0 McctlFlmc Mcflg Adpu Affc Awai Etrigle Etrigp Ascie AscifFifo FRZ1 FRZ0 SRES8 SMP1 SMP0 $00A0 $00C7 PWM Pulse Width Modulator 8 Bit 8 Channel Pwmscnta PwmsclbPwmscntb PWMCNT0 $00D0 $00D7 SCI1 Asynchronous Serial Interface SCI0 Asynchronous Serial Interface $00E0 $00E7 IIC Inter IC Bus SPI0 Serial Peripheral Interface $00E8 $00EF Bdlc Byte Level Data Link Controller J1850 $00F0 $00F7 SPI1 Serial Peripheral Interface$00F8 $00FFReserved $0110 $011B Eeprom Control Register eets2k $0100 $010F Flash Control Register fts128k2 Eaddrlo $011C $011F Reserved for RAM Control RegisterATD1TEST0 ATD1TEST1 $0140 $017F CAN0 Motorola Scalable can Mscan TXE2 TXE1 TXE0 CAN0TFLGCAN0TIER TXEIE2 TXEIE1 TXEIE0 $0180 $01BF CAN1 Motorola Scalable can Mscan $0200 $023FReserved $01C0 $01FFReserved $0240 $027F PIM Port Integration Module PTIP7 PTIP6 PTIP5 PTIP4 PTIP3 PTIP2 PTIP1 PTIP0 PtipPerp PERP7 $0280 $02BF CAN4 Motorola Scalable can Mscan $0300 $035F Byteﬂight $02C0 $02FFReserved Bftlen BftidentBFTDATA0 Bfrident $0360 $03FFReserved Part ID AssignmentsAssigned Part ID Numbers Memory size registers MC9S12DT128B Device User Guide Device Pinout Signal Description PAD14/AN14 IOC0/PT0 Signal Properties Signal Properties SummaryPin Name Description PE1 IRQ Vddr Ppsm SPI0 Perm PM3 Txbf TXCAN1 TXCAN0 SS0 VddxPM2 Rxbf RXCAN1 RXCAN0 MISO0 Vddx CAN1, CAN0, Miso EXTAL, Xtal Oscillator Pins Detailed Signal DescriptionsReset External Reset Pin Test Test Pin 9 PAD60 / AN060 Port AD Input Pins 7 PAD148 / AN160 Port AD Input Pins10 PA70 / ADDR158 / DATA158 Port a I/O Pins 11 PB70 / ADDR70 / DATA70 Port B I/O Pins Pierce Oscillator Connections PE7=0 Colpitts Oscillator Connections PE7=1 14 PE5 / Moda / IPIPE0 Port E I/O Pin 13 PE6 / Modb / IPIPE1 Port E I/O Pin15 PE4 / Eclk Port E I/O Pin 16 PE3 / Lstrb / Taglo Port E I/O Pin 22 PH5 / KWH5 Port H I/O Pin 21 PH6 / KWH6 Port H I/O Pin23 PH4 / KWH4 Port H I/O Pin 24 PH3 / KWH3 / SS1 Port H I/O Pin 32 PK50 / XADDR1914 Port K I/O Pins 30 PJ10 / KWJ10 Port J I/O Pins29 PJ6 / KWJ6 / RXCAN4 / SDA Port J I/O Pin 31 PK7 / ECS / Romctl Port K I/O Pin 37 PM3 / Txbf / TXCAN1 / TXCAN0 / SS0 Port M I/O Pin 36 PM4 / Bfpsyn / RXCAN0 / RXCAN4/ MOSI0 Port M I/O Pin38 PM2 / Rxbf / RXCAN1 / RXCAN0 / MISO0 Port M I/O Pin 39 PM1 / TXCAN0 / TXB Port M I/O Pin 44 PP4 / KWP4 / PWM4 Port P I/O Pin 43 PP5 / KWP5 / PWM5 Port P I/O Pin45 PP3 / KWP3 / PWM3 / SS1 Port P I/O Pin 46 PP2 / KWP2 / PWM2 / SCK1 Port P I/O Pin Power Supply Pins VDDX,VSSX Power & Ground Pins for I/O Drivers 3 VDD1, VDD2, VSS1, VSS2 Core Power PinsVssa 5 VRH, VRL ATD Reference Voltage Input Pins VDDA, Vssa Power Supply Pins for ATD and VregVDDPLL, Vsspll Power Supply Pins for PLL Vregen On Chip Voltage Regulator Enable MC9S12DT128B Device User Guide Clock Connections System Clock Description MC9S12DT128B Device User Guide Mode Selection Chip Configuration SummaryModes of Operation Clock Selection Based on PE7 Security Securing the MicrocontrollerOperation of the Secured Microcontroller Low Power Modes MC9S12DT128B Device User Guide Vectors Resets and InterruptsVector Table Interrupt Vector Locations 1 I/O pins Effects of Reset Memory MC9S12DT128B Device User Guide Enhanced Capture Timer ECT Block Description Clock and Reset Generator CRG Block DescriptionHCS12 Core Block Description Analog to Digital Converter ATD Block Description Serial Peripheral Interface SPI Block Description DescriptionJ1850 Bdlc Block Description Byteflight BF Block Description Mscan Block Description RAM Block DescriptionPort Integration Module PIM Block Description Voltage Regulator Vreg Block Description Printed Circuit Board Layout Proposal Suggested External Component ValuesComponent Purpose Type Value Recommended PCB Layout for 112LQFP Colpitts Oscillator Recommended PCB Layout for 80QFP Colpitts Oscillator Recommended PCB Layout for 112LQFP Pierce Oscillator Recommended PCB Layout for 80QFP Pierce Oscillator Power Supply Appendix a Electrical CharacteristicsGeneral Parameter Classification Current Injection Pins Absolute Maximum Ratings Num Rating Symbol Min Max UnitESD Protection and Latch-up Immunity Table A-1 Absolute Maximum Ratings1 Model Description Symbol Value Unit Table A-3 ESD and Latch-Up Protection CharacteristicsOperating Conditions Table A-2 ESD and Latch-up Test Conditions Power Dissipation and Thermal Characteristics Rating Symbol Min Typ Max UnitTable A-4 Operating Conditions Pint = IDD ⋅ VDD + Iddpll ⋅ Vddpll + Idda ⋅ Vdda 9 I/O Characteristics Table A-5 Thermal Package Characteristics1Num Rating Symbol Min Typ Max Unit Table A-6 5V I/O Characteristics Supply Currents Measurement ConditionsAdditional Remarks Table A-7 Supply Current Characteristics ATD Operating Characteristics ATD CharacteristicsTable A-8 ATD Operating Characteristics Factors influencing accuracy Table A-9 ATD Electrical Characteristics Source capacitanceCurrent injection Table A-10 ATD Conversion Performance ATD accuracy Figure A-1 ATD Accuracy Definitions NVM timing NVM, Flash and EepromSingle Word Programming Burst Programming Sector Erase Table A-11 NVM Timing CharacteristicsMass Erase Blank Check Table A-12 NVM Reliability Characteristics NVM ReliabilityNum Rating Cycles Data Retention Unit Lifetime 100 Table A-13 Voltage Regulator Recommended Load Capacitances Voltage Regulator 102 Startup Reset, Oscillator and PLL Pseudo Stop and Wait Recovery Table A-15 Oscillator CharacteristicsOscillator Phase Locked Loop XFC PinXFC Component Selection Jitter Information ⋅ synr + = max ⎜ ⋅ t nom Table A-16 PLL Characteristics Mscan Table A-17 Mscan Wake-up Pulse Characteristics 110 Master Mode LSB Master LSB OUT Mosi Port Data Slave Mode Table A-19 SPI Slave Mode Timing Characteristics General Muxed Bus Timing External Bus Timing Eclk PE4 PA, PBECS PK7 PE2 Lstrb PE3 Noacc PE7 PIPO0 Pweh Table A-20 Expanded Bus Timing Characteristics 118 Appendix B Package Information 112-pin Lqfp package 112-pin Lqfp mechanical dimensions case no 80-pin QFP package 80-pin QFP Mechanical Dimensions case no B 122 User Guide End Sheet 124