ES5108_06 CYRUSTEK | Alldatasheet
Document overview
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Technical content
Features
Multi-functionmeasurementsystem: Analog todigitalconverter. Shortcircuitbeeper. Frequency counter. Frequency counter, auto range from 2KHz to 20MHz Low batterydetector. Displayholdand Max/Min. Triplex LCD display. Full3 1/2-DigitDisplay. Annunciators—Hold, Max/Min, KHz, MHz, Low-bat,Continuance. 1 annunciatordrive pinforunitdisplay. 3 decimalpointdriverswith3 independent controlpins. Polaritydriver. Displays"OL" forinputoverrange. Providesserialdataoutput. Guaranteedzeroreadingwithzeroinput. Truepolarityindicationforprecisionnulldetec- tion. Con venient9V batteryoperation. Low noiseA/D converter: Differentialinputs,1pA biascurrent. Differentialreferenceforratiometricohms. On-chip voltage reference, C drift. Low linearityerror.
Description
The ES5108 isdesignfor3 1/2-DigitDigitalMulti- meter which combines an integratedA/D converter, MAX/MIN, hold,shortcircuitbeeper,low batteryde- tector,a frequency counter,and serialdataoutput. A ’HOLD’ inputallows theES5108 to hold thecur- rentA/D readoutorfrequency readout.The frequency counterisauto-rangingfrom 2KHz to 20MHz overa five decaderangewithKHz and MHz annunciators. Shortcircuitbeeperwillsound whenever thereadout islessthan30 afterenablingtheshortcircuitbeeper. Thisfeatureisusefulindetectingshortcircuitswithout w atchingtheLCD. The ES5108 provides3 independentdecimalpointdriv- ingpinsforthemanufacturertodeterminewhich deci- mal pointorunitisdisplay,the3 decimalpointdrivers arebuilt-inES5108. A pplication Digitalpanelmeters,digitalmultimeters,thermome- ters,capacitancemeters,pH meters,photometers,etc.
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CYR USTEK CO. ES5108 3 1/2Digit ADC with serialoutput Block Diagram " # ! " $ " & ' ( ) * + " & , & $ & . . , & $ " & " % / . ! . ! 0 1 2 3 4 5 6 7 % 8 % 8 9 9 9 & . . " %
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CYR USTEK CO. ES5108 3 1/2Digit ADC with serialoutput Pin Assignment
1 LQFP-48pin
13 14 15 16 17 18 19 20 21 22 23 24 3748 38394041424344454647A3/G3/D3 B3/C3/DP2 HOLD/F2/E2 A2/G2/D2 B2/C2/DP1 A1/G1/D1 MAX/F1/E1 B1/C1/BAT COM1 COM2 FREQ-IN COM3 SDO BZINM EOC CINT VIN+ FREQ/VOLT INT OSC1 KHz/F3/E3 CONT/-/MHz OSC2 OSC3 DGND VREF+ VREF- B4/C4/DP3 DINT CLK BZINS BZOUT LB HOLD MAX RESET DP3 DP2 DP1 ANNUNC CREF+ VBUFF CREF- CAZ VIN- ANA-COM ES5108L
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CYR USTEK CO. ES5108 3 1/2Digit ADC with serialoutput
2 SSOP-48pin
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CYR USTEK CO. ES5108 3 1/2Digit ADC with serialoutput
3 DIP-40pin
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CYR USTEK CO. ES5108 3 1/2Digit ADC with serialoutput Pin Description PinNo. Symbol Type Description 1 VREF- - Low differentialreferenceinputconnection. 2 VREF+ - High differentialreferenceinputconnection. 3 DGND - PullhightoV+ allLCD segments willbe activated. 4 OSC3 - Crystaloscillatorconnection.(RC) 5 OSC2 - Crystaloscillatorconnection.(output) 6 OSC1 - Crystaloscillatorconnection.(input) 7 INT O Integrationstatusflag. 8 FREQ/V OL T I Frequency counter/voltagemeasurementselectpin.ConnectingtoV+ willenablethefrequency counter,connectingtoTEST1 oropen willex- ecutevoltagemeasurement.Thispinisinternallypulldown toTEST1. 9 V+ P Positive supplyvoltage. 10 CONT/-/MHz O LCD segment drive.(Continuity.,polarity,MHz) 11 B4/C4/DP3 O LCD segment drive.(B4,C4, decimalpoint3) 12 KHz/F3/E3 O LCD segment drive.(KHz, F3,E3) 13 A3/G3/D3 O LCD segment drive.(A3,G3, D3) 14 B3/C3/DP2 O LCD segment drive.(B3,C3, decimalpoint2) 15 HOLD/F2/E2 O LCD segment drive.(DataHold,F2,E2) 16 A2/G2/D2 O LCD segment drive.(A2,G2, D2) 17 B2/C2/DP1 O LCD segment drive.(B2,C2, decimalpoint1) 18 MAX/F1/E1 O LCD segment drive.(Max, F1,E1) 19 A1/G1/D1 O LCD segment drive.(A1,G1, D1) 20 B1/C1/BAT O LCD segment drive.(B1,C1, low battery) 21 COM1 O LCD common drive#1. 22 COM2 O LCD common drive#2. 23 COM3 O LCD common drive#3. 24 FREQ-in I Frequency counterinputpin. 25 DINT O De-Integrationstatusflag.
26 ANNUNC O Squarew ave outputattheLCD backplanefrequency,synchronizedto
COM1. Connectingan LCD segment toANNUNC pinturnsiton;con- nectingtobackplaneturnsitoff.
27 DP1 I 1stdecimalpointselectioninputforvoltagemeasurement,internally
pulled-down toTEST1.
28 DP2 I 2nd decimalpointselectioninputforvoltagemeasurement,internally
pulled-down toTEST1.
29 DP3 I 3rd decimalpointselectioninputforvoltagemeasurement,internally
pulled-down toTEST1. 30 RESET I Resetinputpin. Connectingto V+ willcancelboth MAX/MIN and Hold functions. 31 MAX I MAX inputpin.PulsetoV+ toenableMAX function. 32 HOLD I Hold inputpin.ConnectingtoV+ forholdfunction. 33 LB O Low batteryflag.Pullhighiflow battery. continuedon nextpage; ThistableisforES5108L
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CYR USTEK CO. ES5108 3 1/2Digit ADC with serialoutput ;=; ; continuedfrom previouspage PinNo. Symbol Type Description 34 BZOUT O Piezobuzzeroutput.Drivinga buzzerat2.5KHz audiofrequency. 1. Whene verthereadoutislessthan30 and BZINS isconnectedto V+, BZOUT willgeneratea 2.5KHz sound output. 2. Whene ver the BZINM is connectedto V+ itwillforcethe BZOUT togenerate2.5KHz sound output. 35 BZINS I Buzzer controlslave input. This pin is internallypulled-down to TEST1. See BZOUT 36 CLK I Externalclockinputpinforserialdataaccessing. 37 SDO O Serialdataoutputpin. 38 BZINM I Buzzercontrolmasterpin.Thispinisinternallypulled-down toTEST1. See BZOUT 39 EOC O End ofconversionindicator. 40 V - P Ne gative supplyvoltage.Connectingtobatterynegative terminal. 41 VINT - Integratoroutput. 42 VB UFF - Integrationregisterconnection. 43 CAZ - Auto-zerocapacitorconnection. 44 VIN- I Analog low inputsignal. 45 VIN+ I Analog highinputsignal. 46 AN A-COM O Setthecommon-mode voltageforthesystem. 47 CREF- - Ne gative capacitorconnectionforon-chipA/D converter. 48 CREF+ - Positive capacitorconnectionforon-chipA/D converter. Note: 1. -/MHz forES5108D AbsoluteMaximum Ratings Characteristic Rating SupplyVoltage(V+ toV -) 12V Analog InputVoltage(eitherinput) V+ toV - ReferenceInputVoltage(eitherinput) V+ toV - Clock Input DGND toV+ Power Dissipation(plasticpackage) 800mW OperatingTemperature C to>@? C StorageTemperature ABDC C toEF C Lead Temperature(soldering,10sec) GD? C ElectricalCharacteristics Parameter Symbol TestCondition Min. Typ. Max. Units DC CharacteristicsZero In- putReading – HJILKNMOP; DQ , full- scale=200.0mV -000.0 RSD ; +000.0 DigitalReading continuedon nextpage; ;=;
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CYR USTEK CO. ES5108 3 1/2Digit ADC with serialoutput ;=; ; continuedfrom previouspage Parameter Symbol TestCondition Min. Typ. Max. Units RatiometricReading – HJILK =HUTWVYX , H TZVYX =100mV 999 999/1000 1000 DigitalReading Linearity(Max. deviation from beststraightlinefit) – full-scale=200mVor full-scale=2.000V -1 RSP;[G 1 Counts Roll-overError – A\\HJILK =>UHUI]K ^ 200.0mV -1 RSP;[G +1 Counts Common Mode Rejection Ratio – HU_W\` =R 1V,HUILK =0V Full-Scale=200.0mV – 50 – a V/V Low batteryflag – V+ toV - 6.6 6.9 7.2 V Noise – H ILK M DQ , full- scale=200.0mV – 15 – a Vp-p InputLeakage Current – HJILKbMcDQ – 1 10 pA Zero ReadingDrift – H ILK M DQ , C dBegfhdU>@? C – 0.2 1 a V/ C Analog COMMON Voltage (withrespecttoV i ) – 25K j Between Common and Posi- tive Supply 2.8 3.0 3.2 V Analog COMMON Temper- atureCofficient – 25K j Between Common and H i C d TA dk?l C – 60 75 ppm/ C Segment Drive Voltage – Hmi toHon =9V 4 5 6 V Back planeDrive Voltage – Hmi toHon =9V 4 5 6 V Supply Current (Does not includeCOMMON current) – HJILK =0V – 1.2 1.6 mA Frequency counterinput level QWprqtsuQWvxwzy|{ Q DGND +1.5 Inputterminals: BZINM, BZINS, MAX/MIN, HOLD, RESET ,FREQ/V OL T,CLK, DP1, DP2, DP3 Inputlogichighvoltage – Q}i~AED; C – – V Inputlogiclow voltage – DGND +1.5 Pulldown current – QWpr =Qoi – 5 – a A A C Characteristics Characteristics Symbol Min. Typ. Max. Unit Operatingfrequency – 40 – KHz Buzzerdrive frequency FREQ-IN W aveform RisingTime xF – – 20 ns FREQ-IN W aveform FallingTime – – 20 ns FREQ-IN W aveform PulseW idth W 17 – – ns Clock Delay Time 1 – 5000 a s Data Set-upTime ¡ – – 500 ns Clock PulseW idth MAX/MIN duration W=¤ 0.8 – – sec MAX/MIN and HOLD K eys K ey debouncetime ¡¢ – 32 38 ms
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CYR USTEK CO. ES5108 3 1/2Digit ADC with serialoutput
4 T iming W aveforms
¹ º » ¹ º º ¹ ¼ ½ ¹ ¼ ½ Ä Ä Ä ¹ Å ¹ Æ Ç È É Ê Ë Ì Ê Í Î Ï Ì Ê Ê Ë Í È É Ð Ñ ¹ Î Ò Ó ¹ Ó Î Ò Ì ¹ Å Ô ¹ Õ Ö Æ Ä Ä Ä FunctionalDescription
1 Analog Common
The Common pin isused to setthecommon-mod voltageforthesystem in which theinputsignalsarefloatingwith respecttothepower supplyof theES5108. In most of theapplications,VIN-, VREF- and COMMON pinsaretiedto thesame point,so thatthecommon mode voltagecan be removed from thereferencesystemand theconverter.Insome applictions,VIN- may notatthesame pointwithCOMMON and thusa common mode voltageexistsinthesystem,The highCMRR(86db typical)oftheES5108 can take careofthiscommon mode voltage.Ne vertheless,itshouldbe careto preventtheoutputoftheintegratorfrom saturation. The COMMON pinisalsoused as a voltagereference.Itsetsa voltageof around2.9voltsmore negative thanthe positive supply.The COMMON voltageofES5108 hasa low outputimpedanceof ECj typical. The analogCOMMON istiedinternallytoan N-channelFET capableofsinking30mA. ThisFET willholdtheCOM- MON voltageat2.9voltswhen an externalloadattemptstopulltheCOMMON voltagetow ardthepositive supply. The sourcecurrentof COMMON isonly10a A, so itiseasytopullCOMMON voltagetoa more negative voltage withrespecttothepositive supply. When thetotalsupplyvoltageislarge enough tocausethezenertoregulate(>7V),theCOMMON voltagewillhave a low temperaturecoefficienttypicallylessthanD W C. Thisvoltagecan be usedtogeneratetheES5108 reference voltageand anexternalvoltagereferencewillbe unnecessaryinmost cases.
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CYR USTEK CO. ES5108 3 1/2Digit ADC with serialoutput
2 Reference Voltage
Fora 1000 countsreading,theinputsignalmust be equaltothereferencevoltage.As a result,itrequirestheinputsignal be twicethereferencevoltagefora 2000 countsfull-scalereading.Thus,forthe200.0mV and 2.000V full-scale,the referencevoltageshouldequal100.0mV and 1.000V,Insome applicationsthefull-scaleinputvoltagemy be otherthan 200mV or2V,but600mV .Forexample,thereferencevoltageshouldbe setto300mV and theinputsignalcan be used directlywithoutbeingdivided. The differentialreferencecanbe usedduringthemeasurementofresistorby theratiometricmethod and when a digital readingof zeroisdesiredforQ Ø]ÙÛÚ M 0. A compensatingoffsetvoltagecan be appliedbetween COMMON and VIN- and thevoltageofbeingmeasuredisconnectedbetweenCOMMON and VIN+.
3 System T iming
The oscillatorfrequency isdividedby fourpriortoclockingtheinternaldecadecounters.The signalintegratetakes a fixed 1000 countstimeperiodwhich isequalto4000 clockPulses.The backplanedrive signalisderived from dividing clockfrequency by 240.To mak e a maximum rejectionoflinefrequency(60Hz or50Hz)noisepickup,thesignalintegrate periodshouldbe a multipleof thelinefrequency period.For 60Hz-noiserejection,oscillatorfrequenciesof 120KHz, 80KHz, 60KHz, 48KHz, 40KHz, etc.shouldbe selected.For50Hz rejection,oscillatorfrequenciesof100KHz, 50KHz, 40KHz, etc.w ouldbe suitable. Forallrangesoffrequency Ü r £ shouldbe 100K j ,Ý Þ isselectedfrom theapproximateequationf^ 0.45/RC.For 48KHz clock(3reading/second),Ý £ =100PF.
4 IntegratingResistor
The inputbufferamplifierand integratorbothhave classA outputstagewith100a A ofquiescentcurrentand can supply 20a A drive currentswithnegligiblelinearityerrors.The integratingresistorshouldbe chosentoremainintheoutput stagelineardrive region.Itshouldbe noticedthattheintegratingresistorshouldnotbe so large such thattheleakage currentsofprintedcircuitboardwillinduceerrors.Fora 200mV full-scaletherecommended integratingresistorvalueis 47K j and for2V full-scaleis470K j .
5 IntegratingCapacitor
The integratingcapacitorshouldbe selectedtomaximize integratoroutputvoltageswing withoutcausingoutputsatura- tion.IftheanalogCOMMON isused as voltagereference,aR 2V full-scaleintegratoroutputswing issatisfactory. For 3 readings/second(48KHz clock)a 0.22a F valueof Ý|pßgà issuggested.When differentoscillatorfrequenciesareused, Ý|pßgà must be changedininverseproportiontomaintainthenominalR 2V integratorswing. The integratingcapacitorshouldhave low dielectricabsorptiontominimizeroll-overerror.An inexpensivepolypropy- lenecapacitorwillw orkwell.
6 A uto-Zero Capacitor
The auto-zerocapacitorsizehas some influenceon systemnoise.A 0.47a F capacitorisrecommended for200mV full scalewhere noiseisvery important.A 0.047a F capacitorisadequatefor2V full-scaleapplications.A mylar type dielectriccapacitorisadequate.
7 Reference VoltageCapacitor
When VIN- istiedtoanalogCOMMON, a 0.1a F capacitoradequatetobe thereferencecapacitor.Ifa large common-mod voltageexistsand theapplicationrequiresa 200mV fullscale,a largervalueisrequiredtopreventroll-overerror.A 1.0a F capacitorwillholdtheroll-overerrorto0.5count.
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CYR USTEK CO. ES5108 3 1/2Digit ADC with serialoutput
8 TEST
The TEST pinistiedtotheinternallygenerateddigitalsupply.It’s potentialis5V lessthanQ i .Thus TEST may be used asthenegative power supplyconnectionforexternallygeneratedsegment drivers. IfTEST ispulledlow toQán allsegmentsplustheminus signwillbe activatedand thedisplayshouldread-1888.For suchoperation,thesegment hasa constantDC voltageand may destroy theLCD displayifleftinthismode forseveral minutes.
9 Frequency Counter
The ES5108 provides2KHz to 2MHz five-decadeauto-rangefrequency counter. In thecountermode, pulsesatthe FREQ-IN willbe countedand displayed.The frequency counterderivesitstimebasefrom theclockoscillatorand gets one readoutpersecond.The frequency counteraccuracy isdeterminedby theoscillatoraccuracy.Foraccuratefrequency measurement,a 40KHz quartzcrystaloscillatorisrecommended. The decimalpointsareautomaticallysettofrequency mode.See following table: FREQ-IN Decimal point Annunciator 0KHz to1.999KHz DP3 KHz 2.0KHz to19.99KHz DP2 KHz 20KHz to199.9KHz DP1 KHz 200KHz to1999KHz NONE KHz 2.0MHz to19.99MHz DP2 MHz 20MHz ormore DISPLA Y "OL"
10 Hold,MAX and MAX/MIN
"Hold"functionwillholdthecurrentreadoutand converteroperation. "MAX" functioninES5108L willdisplaythemaximum value. "MAX/MIN" functioninES5108D hastwo mode :MAX and MIN. When theMAX/MIN ispressedforthefirsttime,the meterdisplaysthemaximum value.When theMAX/MIN ispressedagain,themeterdisplaystheminimum value.The meterreturnstonormalmode iftheMAX/MIN ispressedmore thenone seconds.
11 Serialdata output
theES5108 providesserialdataoutputforuseinconnectionwithmicrocontrollers.Duringthisoperation,ES5108 uses CLK, SDO and EOC pins.The following isthetimingdiagramofthisconnection. The EOC pinwillbe pulledHIGH attheend ofconversionand thecontentofserialoutputdatabufferwillupdatesimul- taneously. The w aveformofEOC pinwillgo LO W assoonasCLK pinreceivesclocksignal.OtherwisetheEOC pinwillstayHIGH and thengo LO W in10ms. Serialdataoutputformat: D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 LSB MSB 1. VoltageMode : (a)D0(Polarity):’1’for’+’and ’0’for’-’ (b) D1(MSD) :’1’forMSD = 1 and ’0’forMSD = 0 (c)D2 toD5 for3rdLSD(from 0000 to1001). (d) D6 toD9 for2nd LSD(from 0000 to1001). (e)D10 toD13 for1stLSD(from 0000 to1001). (f)D14 and D15 fordecimalpointsbits:’00’fornone,’01’forDP1, ’10’forDP2, ’11’forDP3.
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CYR USTEK CO. ES5108 3 1/2Digit ADC with serialoutput 2. Frequency Mode (a)D0(KHz/MHz) :’1’forMHz and ’0’forKHz. Specialdataformat Items D15...D6 D5 D4 D3 D2 D1 D0 Initialstate(0000) Random and don’tcare 1 1 1 1 1 1 Positive Ov erflow(OL) Random and don’tcare 0 0 1 1 1 1 Ne gative Ov erflow(-OL) Random and don’tcare 0 0 1 1 1 0
12 LCD Segment Drivers
The ES5108 drives a triplex LCD withthreecommons. ThisLCD includes3 1/2-digits,threedecimal,pointspolarity signand annunciatorsforpeakhold,data-hold,continuity,frequency and low battery. The following figureindicatesthe assignmentsofthedisplaysegments tothecommons and segment drive lines.
12.1 ES5108L
PinNo. COM1 COM2 COM3
10 CONT – MHz
11 B4 C4 DP3
12 KHz F3 E3
13 A3 G3 D3
14 B3 C3 DP2
15 HOLD F2 E2
16 A2 G2 D2
17 B2 C2 DP1
18 MAX F1 E1
19 A1 G1 D1
20 B1 C1 B AT
21 COM1 – –
22 – COM2 – 23 – – COM3
12.2 ES5108D
PinNo. COM1 COM2 COM3
3 CONT – MHz
4 MIN B4/C4 DP3
5 KHz F3 E3
6 A3 G3 D3
7 B3 C3 DP2
8 HOLD F2 E2
9 A2 G2 D2
10 B2 C2 DP1
11 MAX F1 E1
12 A1 G1 D1
13 B1 C1 B AT
14 COM1 – –
15 – COM2 – 16 – – COM3
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CYR USTEK CO. ES5108 3 1/2Digit ADC with serialoutput The LCD w aveform isasfollows â ã ä å â ã ä æ â ã ä ç è é é ê é â è ë ë ì í î ï í ð ñ ì ò ó í ã ô ô õ í î ï í ð ñ ì ö ÷ â ã ä å ò ó í ã é ø ñ ù í ö ñ ù í ó ì ò ó í ã ô ô õ í î ï í ð ñ ì ö ÷ â ã ä ç ò ó í ã ô ô ø ñ ù í ö ñ ù í ó ì ò ó í ã é è ë ë ì í î ï í ð ñ ì ã é ú û ú ü â ý å ú ü â ý æ ý þ é ý ú û ú ü â ý å ú ü â ý æ ý þ é ý ú û ú ü â ý å ú ü â ý æ ý þ é ý ú û ú ü â ý å ú ü â ý æ ý þ é ý ú û ú ü â ý å ú ü â ý æ ý þ é ý ú û ú ü â ý å ú ü â ý æ ý þ é ý ú û ú ü â ý å ú ü â ý æ ý þ é ý ú û ú ü â ý å ú ü â ý æ ý þ é ý The annunciatoroutputisa squarew ave runningattheLCD backplanefrequency (ex.167Hz for] =40KHz.) The pk- pk amplitudeisequalto(V+ –DGND.) Connectingan annunciatoroftheLCD totheANNUNC pinturnstheannunciator on;connectingittocommon turnsitoff.
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CYR USTEK CO. ES5108 3 1/2Digit ADC with serialoutput TestCircuit CREF+ CINT VBUFF CAZ VIN+ VREF- OSC3 OSC2 OSC1 10K 24K 1K 1nF VREF+ ANA-COM VIN- -INPUT ANALOG 0.01uF CREF- 0.1uF TEST BZOUT BZINS HOLD DP1 DP2 DP3 RESET 27ANNUNCLCD DRIVER LCD DISPLAY 10 + - DGND BUZZER PIEZO 1nF MAX ES5108L 0.22uF 0.47uF 47K
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CYR USTEK CO. ES5108 3 1/2Digit ADC with serialoutput A pplicationCircuit CREF+ VBUFF CAZ VIN+ VREF- 24K 1K VREF+ ANA-COM VIN- -INPUT ANALOG 0.01uF CREF- 0.1uF DP1 DP2 DP3 RESET + - BZINS 35 TEST 3 DGND PIEZO BUZZER 34BZOUT BZINM 38 LCD DRIVER LCD DISPLAY OSC2 OSC1 FREQ-IN24 FREQ/VOLT ANNUNC (FREQUENCE) (VOLTAGE)OPEN CLK EOC SDO uC 1nF 4/8-BIT HOLD MAX CINT 0.22uF 0.47uF 47K ES5108L 40KHz Crystal DGND Fin 470pF (optional) 220pF
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CYR USTEK CO. ES5108 3 1/2Digit ADC with serialoutput Packaging
1 LQFP 48pin
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CYR USTEK CO. ES5108 3 1/2Digit ADC with serialoutput 2 48pin ssop D HeES5108S DY e b E c" A " L 0.010 H A1 A2 A DETAIL : A SYMBOLS A b c D E e He L Y NOM. MAX.MIN. 0.095 0.008 0.008 0.089 0.620 0.291 0.396 0.020 0.102 0.012 0.094 0.010 0.008 0.625 0.295 0.025 0.406 0.030 0.056 0.110 0.016 0.099 0.013 0.630 0.299 0.416 0.040 0.003 UNIT : INCH SEARING PLANE GAUGE PLANE
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CYR USTEK CO. ES5108 3 1/2Digit ADC with serialoutput 3 40pin dip