HOLT HI?8470 User manual

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AN‐8470,Rev.AHOLTINTEGRATEDCIRCUITS3/2/15
1
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23351 Madero,
Mission Viejo, CA
92691. USA.
Tel: + 1 949 859 8800
Fax: + 1 949 859 9643
Email: [email protected]
Web: www.holtic.com
HI‐847016SensorArraywith
ARINC429Output,Ground/Openor
Supply/OpenSensors
EvaluationBoard
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UserGuide
March2,2015
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AN‐8470,Rev.AHOLTINTEGRATEDCIRCUITS3/2/15
2
INTRODUCTION
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TheHoltHI‐8470EvaluationBoarddemonstratesfeaturesoftheHI‐847016SensortoARINC429output
IC.TheboardandtheHI‐8470canberunfromasingle3.3V+/‐5%supplyvoltage.Thedevicehaspreset
internalsensorthresholds,externalthresholdscanalsobesetwithboard‐mountedpotentiometers.The
HI‐8470andEVM(EvaluationModule)requirenosoftwareforcontrol;allfunctionsaresetbyhardware
switches.DIPswitchesconfigurethedeviceanddatainputs.TheEVMisshowninthepicturebelow:
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Thisguidesummarizeshowtogetsetupandrunningquickly.

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AN‐8470,Rev.AHOLTINTEGRATEDCIRCUITS3/2/15
3
KITCONTENTS
ThisUserGuide
HI‐8470EvaluationBoard
BoardBlockDiagram

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AN‐8470,Rev.AHOLTINTEGRATEDCIRCUITS3/2/15
4
JumperFunctions
JUMPERDEFAULT DESCRIPTION
VLOGICONLinkforVLOGICsupplytotheLED
VDDONLinkforVDDsupplycurrent(thissuppliestheHI‐8470
converterfortheARINC429outputs)
XTALVDDONSupplies3.3Vtothe1MHzcrystaloscillator
EXTCLKONTouseexternalclock,disconnectlinkandapplyVlogic
levelclocktotheCLKtestpoint
MASTERRESETOFFInplace,thisholdsHI‐8470inreset
TXENBONInplace;pushbutton‘TRANSMIT’ispressedto
transmit.Forcontinuoustransmit,removethelink.
EXTTHSOGONWhennotinplace,theexternalGLO_SETand
GHI_SETpotentiometerssettheGND/Open
thresholds.Withjumperinplace,thedeviceuses
internalthresholds.
EXTTHSVOONWhennotinplace,theexternalVLO_SETand
VHI_SETpotentiometerssettheSupply/Open
thresholds.Withjumperinplace,thedeviceuses
internalthresholds.
J5GNDSensorinputswitch0:7source;GNDwhenswitches
are‘ON’.Innon‐GNDposition,thevoltageonthe
VSENSE0:7testpointisapplied,fortheswitchesin
‘ON’position.
J11GNDSensorinputswitch8:15source;GNDwhenswitches
are‘ON’.Innon‐GNDposition,thevoltageonthe
VSENSE8:15testpointisapplied,forswitchesinthe
‘ON’position.
TST0OFFWheninplace,thesensorinputsareallsettoLow,
andresultsinHighsatthesensoroutputs.
TST1OFFWheninplace,thesensorinputsareallsettoHigh,
andresultsinLowsatthesensoroutputs.WithTST1
andTST0inplace,sensorinputsarealternately1,0

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AN‐8470,Rev.AHOLTINTEGRATEDCIRCUITS3/2/15
5
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SwitchFunctions
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SWITCHDEFAULTDESCRIPTION
LABEL0:7OFFARINC429labelbits0:7.
ON=‘1’
SPEED&
ARINCBITS
SPEED=ON
ARINC=
OFF
ARINC429speedandARINC429bits9,10,&27:31.
ON=‘1’(seetableonboardforpositions)
TIMER0:7OFFSetsARINC429messagetransmissiontimer.
ON=‘1’
SEL0:7OFFSetssensortypeforSI0:7.
OFF=GND/Open
ON=Supply/Open
SEL8:15OFFSetssensortypeforSI8:15.
OFF=GND/Open
ON=Supply/Open
SENSOR
0:7
ONSetsstateofsensorinputs0:7stimuli.
ONcorrespondstoGNDorSupply.
OFFcorrespondstoOpenstate.
SENSOR
8:15
ONAsabove,setsstateofsensorinputs8:15.
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AN‐8470,Rev.AHOLTINTEGRATEDCIRCUITS3/2/15
6
ConnectorFunctions
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ConnectorPINDESCRIPTION
SENSORIN
0:7
1to8
9
Sensorinputs;Sensor0:7→Pins1:8
GND
SENSORIN
8:15
1to8
9
Sensorinputs;Sensor8:15→Pins1:8
GND
SENSOR
OUT0:7
1to8
9
Sensoroutputs;Sensor0:7→Pins1:8
GND
SENSOR
OUT8:15
1to8
9
Sensoroutputs;Sensor8:15→Pins1:8
GND
BoardSetUp
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1. Makesurethelinkandswitchpositionsareaslistedinthetablesabove.Connecta3.3V
supplytotheVlogictestpoint.TheVDDlinkconnectspowerfromVLogictotheHI‐8470VDD
pin,whichsuppliestheinternalconverter.TheVlogicjumpersuppliesonlytheLED.
2. Tomeasurethedevice’sVlogicsupplycurrent;removetheVlogicGNDjumperandconnect
anammeteracrossthejumperpins.Thismeasuresonlythedevicecurrentandnottheother
circuitryontheboard.TomeasureVddcurrent,removetheVddjumperandconnectthe
ammeteracrossthejumperpins.RemovetheXTALVDDlink;thecurrentmeasuredwillbe
forthedevice‘unclocked’.Tomeasurethedeviceclockedcurrentconsumption,anexternal
1MHzclockshouldbeused,connectedtotheCLKtestpoint,afterremovingtheEXTCLKlink.

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AN‐8470,Rev.AHOLTINTEGRATEDCIRCUITS3/2/15
7
ARINC429OutputTesting
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1. ThedevicetransmitsthesensordatatotheARINC429outputwhentheTXENBis
switchedhigh.TogeneratejustoneARINC429word,presstheTransmitbutton.To
enablecontinuousARINC429transmission,removetheTXENBlink.Beforetestingensure
theswitchesandlinksareinthedefaultstatesshowninprevioustables,thensetLabel
Switch#8toa‘1’andTimerSwitch#1to‘1’.
2. EnablecontinuousARINC429transmissionbyremovingtheTXENBlink.Connectan
oscilloscopetotheARINC429outputs.Forbestresults,usedifferentialmode.Jumper
TST0forcesallthesensorinputsto‘0’,thisforcesthesensoroutputstoa‘1’.Observethe
ARINC429outputwaveform.Itshouldlooksimilartothewaveformshownbelow:
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3. NowlinkjumperTST1only,forcingthesensorinputstoall1’s.Theoutputpatternforthe
datashouldbeall0’sasshownbelow:

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AN‐8470,Rev.AHOLTINTEGRATEDCIRCUITS3/2/15
8
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4. NowlinkjumperTST1andTST0,forcingthesensorinputstoacontinuouslyalternating
01.Theoutputpatternforthedatashouldbe1010101010101010beasshownbelow:
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5. ReplaceTXENBlink.PressTransmit,onlyoneARINC429wordistransmitted.Changethe
Speedswitchto‘0’,thewaveform,shouldchangeto12kbpsrateasshownbelow:

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AN‐8470,Rev.AHOLTINTEGRATEDCIRCUITS3/2/15
9
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6. Setspeedswitchbackto‘1’.TheTIMERswitchallowsforchangingthetransmitrepetition
rate.Tousethisfeature,removetheTXENBlinktoenablecontinuoustransmission.
Ensurethetimerswitchissetto‘10000000’;onewordwillbetransmittedevery10ms.
Observethisontheoscilloscope;itshouldlooklikethepicturebelow:
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AN‐8470,Rev.AHOLTINTEGRATEDCIRCUITS3/2/15
10
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7. RemovejumpersTST0andTST1.UsetheSpeedandARINC429bitsswitchtotoggleARINC
429outputbits9,10and27to31,seetableontheboardforswitchpositions.Checkthe
correspondingbitchangesontheARINC429output.
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SensorInputandOutputTesting
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1. RemovejumpersTST0andTST1.LeavetheTXENBlinkoff.Setuptheboardindefault
state,thesensorsareinGND/OpenstateandinputstoswitchedtoGND(ON).Now
changealltheSensorinputswitchesto‘OFF’,theoutputwaveformshouldshowtheall‘1s’
pattern,shownearlierinthisdocument.SwitchSensorinput0to‘ON’(GND).TheARINC
429outputshouldchangetotheonebelow,withthechangedsensoroutputstate
transmittedonasa‘1’onbit11.
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2. Setallthesensorinputswitchesto‘ON’(GND),alltheARINC429dataoutputs(bits11:26)
shouldchangetoa‘1’.ThiscanalsobecheckedontheconnectorsSENSOROUT0:7and
8:15.