芯片烧写及解密开发

description

·3or5vsupplyfortheic(vddandgnd)

thest84isacompletelowcostanaloginterfaceforasynchronous3vand5vsmartcards.itcanbeplacedbetweenthecardandthemicrocontrollerwithfewexternalcomponentstoperformallsupplyprotectionandcontrolfunctions.st84isadirectreplacementofst80.mainapplicationsare:smartcardreadersforsettopbox,iccardreadersforbanking,identification,paytv.

·threespecificallyprotectedhalf-duplexbi-directionalbufferedi/olinestocardcontactsc4,c7andc8

·3or5v±5%regulatedcardsupplyvoltage(vcc)withappropriatedecouplinghasthefollowing

–icc<80maatvddp=4to5v

–handlescurrentspikesof40nasupto20mhz

–controlsriseandfalltimes

·thermalandshort-circuitprotectiononallcardcontacts

·automaticactivationanddeactivationsequences;initiatedbysoftwareorbyhardwareintheeventofashort-circuit,card

take-off,overheating,vddorvddpdrop-out

·enhancedesdprotectiononcardside(>6kv)

·26mhzintegratedcrystaloscillator

·clockgenerationforcardsupto20mhz(dividedby1,2,4or8throughclkdiv1andclkdiv2signals)withsynchronousfrequencychanges

·non-invertedcontrolofrstviapinrstin

·iso7816,gsm111andemv(paymentsystems)compatibility

·supplysupervisorforspike-killingduringpower-onandpower-offandpower-onreset(thresholdfixedinternallyorexternallybyaresistorbridge)

·built-indebounceoncardpresencecontacts

·onemultiplexedstatussignaloff

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