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ADS1258
SBAS297A–JUNE2005–REVISEDSEPTEMBER2005
PINASSIGNMENTS
相似物/数字的
pin#nameinput/outputdescription
1ain3analoginputanaloginput3:单独的-endedchannel3,differentialchannel1(–)
2ain2analoginputanaloginput2:单独的-endedchannel2,differentialchannel1(+)
3ain1analoginputanaloginput1:单独的-endedchannel1,differentialchannel0(–)
4ain0analoginputanaloginput0:单独的-endedchannel0,differentialchannel0(+)
negativeanalogpowersupply:0vforunipolaroperation,–2.5vforbipolaroperation.
5AVSSAnalog
(internallyconnectedtoexposedthermalpadofqfnpackage.)
6avddanalogpositiveanalogpowersupply:+5vforunipolaroperation,+2.5vforbipolaroperation.
7pllcapanalogpllbypasscapacitor:connect22nfcapacitortoavsswhenusingcrystaloscillator.
8xtal1analog32.768khzcrystaloscillatorinput1;看
CrystalOscillator
部分.
9xtal2analog32.768khzcrystaloscillatorinput2;看
CrystalOscillator
部分.
10pwdndigitalinputpower-downinput:holdlowforminimumoftwof
CLK
cyclestoengagelow-powermode.
11resetdigitalinputresetinput:holdlowforminimumoftwof
CLK
cyclestoresetthedevice.
clockselectinput:低=activatescrystaloscillator,f
CLK
outputonclkio.
12CLKSELDigitalInput
高=disablescrystaloscillator,applyf
CLK
toclkio.
13clkiodigitali/osystemclockinput/输出(seeclkselpin.)
14gpio0digitali/ogeneral-purposedigitalinput/output0
15gpio1digitali/ogeneral-purposedigitalinput/output1
16gpio2digitali/ogeneral-purposedigitalinput/output2
17gpio3digitali/ogeneral-purposedigitalinput/output3
18gpio4digitali/ogeneral-purposedigitalinput/output4
19gpio5digitali/ogeneral-purposedigitalinput/output5
20gpio6digitali/ogeneral-purposedigitalinput/output6
21gpio7digitali/ogeneral-purposedigitalinput/output7
22sclkdigitalinputspiinterfaceclockinput:dataclockedinonrisingedge,clockedoutonfallingedge.
23dindigitalinputspiinterfacedatainput:dataisinputtothedevice.
24doutdigitaloutputspiinterfacedataoutput:dataisoutputfromthedevice.
25drdydigitaloutputdatareadyoutput:activelow.
26startdigitalinputstartconversioninput:activehigh.
27csdigitalinputspiinterfacechipselectinput:activelow.
28dvdddigitaldigitalpowersupply:2.7vto5.25v
29DGNDDigitalDigitalGround
30VREFNAnalogInputReferenceInputNegative
31VREFPAnalogInputReferenceInputPositive
32aincomanaloginputanaloginputcommon:commoninputpintoallsingle-endedinputs.
33ain15analoginputanaloginput15:单独的-endedchannel15,differentialchannel7(–)
34ain14analoginputanaloginput14:单独的-endedchannel14,differentialchannel7(+)
35ain13analoginputanaloginput13:单独的-endedchannel13,differentialchannel6(–)
36ain12analoginputanaloginput12:单独的-endedchannel12,differentialchannel6(+)
37ain11analoginputanaloginput11:单独的-endedchannel11,differentialchannel5(–)
38ain10analoginputanaloginput10:单独的-endedchannel10,differentialchannel5(+)
39ain9analoginputanaloginput9:单独的-endedchannel9,differentialchannel4(–)
40ain8analoginputanaloginput8:单独的-endedchannel8,differentialchannel4(+)
41adcinnanaloginputadcdifferentialinput(–)
42adcinpanaloginputadcdifferentialinput(+)
43muxoutnanalogoutputmultiplexerdifferentialoutput(–)
44muxoutpanalogoutputmultiplexerdifferentialoutput(+)
45ain7analoginputanaloginput7:单独的-endedchannel7,differentialchannel3(–)
46ain6analoginputanaloginput6:单独的-endedchannel6,differentialchannel3(+)
47ain5analoginputanaloginput5:单独的-endedchannel5,differentialchannel2(–)
48ain4analoginputanaloginput4:单独的-endedchannel4,differentialchannel2(+)
5
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