ATA5702F1000M-WDQW
ATA5702F1000M-WDQW Datasheet
Remote Start<br>• Like RKE but RF is typically 2-way<br>• Fob sends RF to car to "start engine"<br>• Car replies with RF to fob "engine running"<br>• Importand Design Considerations<br>• Very long range, > 300m, requires high RF link budget<br>• RF Link budget = f TX power, RX sensitivity, antenna efficiencies<br>• Higher TX power by managing RF "on" time averaging<br>• Higher RX sensitivity with narrower IF bandwidth & lower data rate<br>• Requires tight frequency control & compensation temp/voltage/lot
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ATA5702F1000M-WDQW |
ATA5702F1000M-WDQW (pdf) |
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| Car Access PEPS, RKE, AES Immobilizer Atmel Car Access System Solutions • launched the first dedicated transmitter PLL U2741B for Remote Keyless Entry RKE applications in 1997 • Atmel is a leading car access supplier and delivered already more than 250 Mio ICs in this application • Strong relationships to the key players in the automotive market Car Access Basic of RKE Remote Start • Like RKE but RF is typically 2-way • Fob sends RF to car to "start engine" • Car replies with RF to fob "engine running" • Importand Design Considerations • Very long range, > 300m, requires high RF link budget • RF Link budget = f TX power, RX sensitivity, antenna efficiencies • Higher TX power by managing RF "on" time averaging • Higher RX sensitivity with narrower IF bandwidth & lower data rate • Requires tight frequency control & compensation temp/voltage/lot Car Access Basic of PEPS Passive Entry / Passive Start • From outside the vehicle Touch car door PE • From inside the vehicle Press "start" button on dashboard PS • LF from car awakens fob LF downlink • Fob measures field strength vectors & sends info to vehicle • Fob orientation is arbitrary - must measure x, y, & z axis 3D • Fob localized Allow "Unlock" if outside confirm if 2-way RF • Fob localized Allow "Start" if inside confirm if 2-way RF • Important system design considerations: • LF field strength regulation over across voltage/temp/coil variation • Accurate LF field strength measurement • High LF field sensitivity outside detection outside detection outside detection inside detection trunk separation outside rear detection outside detection Wide Range Of Car Access Solutions RKE + Immo PKE + Immo Optional Single chip key solution, best in class performance ATA5774C Best in class receiver, with minimum external component, no external IF filter, supports self polling ATA5724C / ATA5781 Single chip key solution, 128 bit AES H/W encryption engine, up to 12.5dBm output power, works down to 1.9V ATA5795C Best in class receiver, with minimum external component, no external IF filter, supports self polling ATA5724C / ATA5781 Immo transponder with built in coil, AES standard ATA5580 Single chip MCU, Immo + 3D LF Wake up ATA5791 Single chip LF driver + Immo Basestation ATA5291 Immo transponder with built in coil, AES standard ATA5580 RF transceiver for smart key and 2 way BCM basestation ATA5831 Smart RF receiver with Flash+MCU ATA5782 |
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