User Guide

ManualsBrandsAcer ManualsElectronicsSi4455 RF module

S I4455R FM oduleU serGuide

P inDescription

P in N am e I/O Description

1 S DN I

Shu tdown (0– V D D V ):SDN = 1,part willbein s hu tdown m ode.SDN = 0,

allotherm odes

2 nS EL I

SerialInterfaceSelect Inpu t (0– V D D V ):Prov ides s elect/enablefu nction

for4-lines erialdata bu s

3 S DI I

SerialData Inpu t (0– V D D V ):Serialdata s tream inpu t for4-lines erial

data bu s

4 S DO O

SerialData Ou tpu t (0– V D D V ):Prov ides s erialdata readback fu nction

ofinternalcontrolregis ters

5 S CL K I

SerialClock Inpu t (0– V D D V ):Prov ides s erialdataclock for4-lines erial

data bu s

nIR Q

Interru pt Statu s Ou tpu t – nIRQ = 0,interru pt ev ent has occu rred.R ead

interru pt s tatu s forev ent details

V DD V DD Su pply v oltage

8 VS S VS S

G rou nd

9 VS S VS S

G rou nd

10 VS S VS S

G rou nd

11 VS S VS S

G rou nd

12 VS S VS S

G rou nd

A Ant. Ant. ConnecttoAntenna.

Figure1.m odulethickness

Summary of content (11 pages)

PAGE 1
S I4455 R FM oduleU serGuide P inDescription P in N am e I/O Description 1 S hu tdow n (0 – V S DN I DD V ):S D N = 1,part w illbein s hu tdow n m ode.
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Figure2.P CB Dim ension Figure3.
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Features Frequency R ange:433~435 M Hz M odulation:FS K P ow erS upply = 3.
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T ypicalA pplicationBlockDiagram GND VDD LDO IO MCU NIRQ SCLK MISO MOSI NSEL SDN RF module With Antenna Serial Peripheral Interface T he Si4455 R F m odu le com m u nicates w ith the hos t M C U ov era s tandard 4-w ire s erial peripheralinterface (S PI):S C L K ,S D I,S D O,and nS E L .T he S PIinterfaceis des igned to operate at a m axim u m of10 M H z.T he S P Itim ing param eters are lis ted in T able1.
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Figure4.S P IW riteCom m and T he Si4455 contains an internalM C U w hich controls alltheinternalfu nctions ofthe radio.For S P Iread com m ands ,a typicalcom m u nication flow ofchecking clear-to-s end (C T S )is u s ed to m akes u re the internalM C U has execu ted the com m and and prepared the data to be ou tpu t ov erthe S D O pin.Figu re 5 dem ons trates the generalflow ofan S PIread com m and.Once the C T S v alu e reads FFh,then the read data is ready to beclocked ou t to the hos t M C U .
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Operating Modes and Timing T he prim ary s tates ofthe Si4455 are s how n in Figu re 7.T he s hu tdow n s tate com pletely s hu ts dow n the radio,m inim izing cu rrent cons u m ption and is controlled u s ing the S D N .A llother s tates are controlled u s ingthe A P Icom m ands S T A R T _ R X ,S T A R T _ T X and C H A N G E _ S T A T E .Figu re8 s how s each ofthe operatingm odes w ith the tim e requ ired to reach eitherR X orT X s tate as w ellas the cu rrent cons u m ption ofeach s tate.
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Figure9.S tart-U pT im ingand CurrentConsum ptionusingS hutdow nS tate Figure10.S tart-U pT im ingandCurrentConsum ptionusingS tandby S tate TX State T heT X s tateis u s ed w henev erthedev iceis requ ired to trans m it data.It is entered u s ingeither theS T A R T _ T X orC H A N G E _ ST A T E com m and.W ith theS T A R T _ T X com m and,thenext s tate can be defined to ins u re optim altim ing.
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are allow ed.Ifthe nIR Q is u s ed to m onitorthecu rrent s tate,therew illbe a s light delay cau s ed by theinternalhardw are from w hen the ev ent actu ally occu rs to w hen the trans ition occu rs on the nIR Q .T he tim e from entering T X s tate to w hen the nIR Q w illtrans ition is 13 μ s .Ifa G P IO is program m ed forT X s tate oru s ed as controlfora trans m it/ receiv e s w itch (T R s w itch),there is no delay. Figure11.
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legitim atetrans m is s ions independent ofthem icrocontroller.T hes e featu res can be enabled u s ingtheR C A .In this s etu p,thepream bleand s yncw ord length can bem odified and thes ync w ord pattern can be s elected.Ifthe pream bleis greaterthan orequ alto 4bytes ,the dev ice u s es the pream bledetection circu it w ith a 2-byte detection thres hold.Ifthe pream bleis les s than 32 bits ,then at leas t tw o bytes ofs yncw ord are requ ired plu s at leas t one byte of0101 pattern (3bytes total).
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A gency Certifications U nited S tate(FCC) T hism odulecom pliesw ithP art15 oftheFCC rulesandregulations.T ofulfillFCC Certificationrequirem ents,anO EM m anufacturerm ustcom ply w iththefollow ing regulations: T hem odulem ustbelabeledw ithitsow nFCC ID (HL ZL S 1).IftheFCC ID isnotvisible w henthem oduleisinstalled insideanotherdevice,thentheoutsideofthedevice m ustdisplay FCC inform ationasfollow ing: ContainsFCC ID :HL ZL S 1 a.T hisdevicem ay notcauseinterference,and b.
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CAU T IO N :Any changesorm odificationsnotexpressly approvedby theparty responsibleforcom pliancecouldvoidtheuser’sauthority tooperatetheequipm ent. T heO EM integratorisstillresponsiblefortestingtheirendproductforany additional com pliancerequirem entsrequiredw iththism oduleinstalled(forexam ple,digital deviceem issions,P C peripheralrequirem ents,etc.). T hisM oduleislabeledw ithitsow nIC ID.