User's Manual

2
Rev 1.1 Mar.06 9
2: Power Interface
Overview of operation
Note: This chapter contains information for both the CDMA (MC5720/
5725) and GSM (MC8755/8765) modules.
Information that is unique to one module type is clearly identified.
Themoduleisdesignedtousea3.3V(nominal)powersupply,
providedbythehost.Itisthehost’sresponsibilitytoprovide
safeandcontinuouspowertothemoduleatalltimes;the
moduledoesNOThaveanindependentpowersupply,or
protectioncircuitstoguardagainstelectricalissues.
Themodule’spowerstateiscontrolledbythehost’sassertion/
de‐assertionofthe
W_Disable#signal.Themodulealso
monitorsitssupplyvoltageandrequestsshutdownifthe
supplyisinsufficient.
Power signals
Themodulemustbeconnectedtoa3.3Vpowersupply(as
indicatedinPCIExpressMiniCardElectromechanicalSpecifi‐
cationRevision1.1).
TheMC8755/8765hasmorepowerpinsthantheMC5720/5725
duetohigherpeakcurrentrequirementsforGSMdevices.
Fordetailedpinoutandvoltage/currentrequirementsofthese
modules,seetheProductSpecificationdocumentforyour
MiniCard.
Electrostatic discharge (ESD)
Youare responsible forensuringthatthehosthasadequate
ESDprotectionondigitalcircuitsandantennaports:
• (Operational)RFport(antennalaunchandRFconnector):
IEC‐61000‐4‐2—Level(ElectrostaticDischargeImmunityTest)
• (Non‐operational)Hostconnectorinterface:
JESD22‐A114‐B+/‐ 1kVHuman BodyModeland
JESD22‐C101 +/‐ 125 VChargedDeviceModel
Specificrecommendationsareprovidedwhereneededinthis
guide,however,thelevelofprotectionrequireddependson
yourapplication.