基于ATmega16的AD7705多通道模拟量采集系统设计

ATmega16AD77051121．0300212．030024ATmega16AD7705CPLDEPM306432。、AD7705。。AD7705ATmega16TP391A1000-3932201104-0466-04、DCSI/OA/D。A/D。16A/DAD7705、。AT-mega1632。。①1A/DAD7705AD7705Σ-Δ16。、。、DSP3。、。。2ATmega16ATmega16Atmel8AVRRISC8CMOS。16KFlashRWW512EEPROM1KSRAM32I/O32JTAG3/T/C/1USART1SPI1。3、AD7705、ATmega16。3．11+5V+3．3V。78L05、Z33D1、D25VD8、D93．3V。C14、C17C15、C16+12V。13．2AD7705AD77052。2．4576MHzY120pF66438①2010-12-2250679050。VDD+5V。AN1+AN1－AN2+AN2－。REF192ADAD77052．5V60．1μF10μF。AD7705Atmega16CS—PD4、RESET—PD5、DRRY—PB3、DIN—PB5、DOUT—PB6SCLK—PB7。2AD77053．3ATmega16ATmega163VCC+5V8MHz。PB5SPIPB6PB7SPI。PB3、PD4、PD5。AVCCLCVCCL110μHC11100nFLC、。AD7705SPIAD7705A/D。3ATmega163．4ATmega16AT-mega16PA4～PA032。CPLDEPM30645/32VHDL3．3VPA4～PA0PD7TD0～TD31。EPM3064EEPROMCMOSCPLD64100TQFP66I/O。PD75/320～31。DS2Y-S8、9AD77051AN1+AN1－4、130AI0+AI0－。PNPQ1TD0D1。1～31AI1～AI31。PD7324CPLDEPM3064。443SPI、AD7705、2。ATmega16SPIAD7705AD7705、、ATmega16AD7705。5。4．1SPIATmega16SPIvoidspi_initvoidDDRB|=1＜＜PB5|1＜＜PB7//MOSISCK7644．ATmega16AD77055DDRB＆=～1＜＜PB6//MISOPORTB|=1＜＜PB6//SPCR=1＜＜SPE|1＜＜MSTR|1＜＜SPR0//SPI0．5MHz4．2AD7705AD7705。AD77051datavoidwr_7705unsignedchardataSPDR=data//whileSPSR＆1＜＜SPIF//AD77052unsignedintrd_7705voidunsignedinttemp//wr_77050x38//1SPDR=1//whileSPSR＆1＜＜SPIF//temp=SPDR＜＜8//SPDR=1//whileSPSR＆1＜＜SPIF//temp|=SPDR//returntempAD7705voidinit_7705voidwr_77050x20//wr_77050x00//20Hzwr_77050x10//wr_77050x44//14．31AD7705。1DRDY2DRDY01voidtimer1_initvoidTCCR1B=0x00//TCCR1A=0x00//TCNT1H=0xF6//TCNT1L=0x3B//120msTCCR1B=0x04//256TIMSK|=BITTOIE1//1voidtimer1_ovf_isrvoidifDRRY==0//ADvo=rd_7705//ADvo5、、。RS232。32。48786438CP11“RAD”、“CTL”、“STSY”。CPUa．SystemStatusALLCOPYCPUb．CPUCP11“START/STOP”“”c．CP11、CP11d．CPUCP11。CPUCP11“RAD”、“CTL”“*”。。a．b．CP11CP11“START/STOP”“”CP11。CP11CP11。PID。a．b．、cc．FeedbackControld．。。。4CENTUM-XL。DCS、、、。468、。1．J．2006371104～107．2．DSPJ．2008393289～291．DesignofMulti-channelAnalogAcquisitionSystemYANRui-jie1LIHai-xiang1HAORui-xia21．ShanxiVocationalCollegeofPowerTechnologyTaiyuan030021China2．TaiyuanUniversityofTechnologyTaiyuan030024ChinaAbstractA32-channelanalogacquisitionsystemwhichhasmicrocontrollerATmega16coredandtheAD7705beenafront-endacquisitionchipandtheCPLDEPM3064beenalogicswitcharraywasdesignedincludingthepresenceofhardwarecircuitthedriverproceduresandapplicationsoftwareandsomeproblemstheAD7705encounteredinpractice．Thetestingresultsshowthatthesystemcancompletemulti-pointandmulti-parametermeasurementsaftercombiningwithothermeasuringdevices．KeywordsanalogacquisitionsystemsAD7705MCUATmega16multi-channel7844．DCS