AS3911 AS3911 door handle Hardware description Application note Rev 1V00 December 2011 Application engineer: Thomas Luecker Marketing Manager: Mark Dickson 1 2 2.1 2.2 2.3 2.4 2.1 3 3.2 4 Disclaimer............................................................................................................ 2 Block Diagram and Introduction .......................................................................... 3 Use of device ..........................................................................................................4 Stand-alone operation..............................................................................................4 3.3 Volt UART Interface .........................................................................................6 Program Interface....................................................................................................6 Schematic ...............................................................................................................6 Gerber ................................................................................................................. 8 Bill of Material .......................................................................................................9 Version History ...................................................................................................10 1 Disclaimer Please note that the provided reference design board, evaluation board, verification board or demonstration board (hereafter named “demonstration circuit board”) are experimental printed circuit boards and are therefore intended for device demonstration and evaluation purposes only for semiconductor integrated circuits supplied by austriamicrosystems. The demonstration circuit boards are not production qualified. This application has not been certified according to CE/FCC/EMC requirements. Device parameters measured with these demonstration circuit boards may not represent typical production test data. THE DEMONSTRATION CIRCUIT BOARDS ARE SUPPLIED WITHOUT WARRANTY OF ANY KIND, EXPRESSED, IMPLIED OR STATUTORY, INCLUDING BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. AUSTRIAMICROSYSTEMS ACCEPTS NO LIABILITY WHATSOEVER ARISING AS A RESULT OF THE USE OF THESE DEMONSTRATION CIRCUIT BOARDS. The fee associated with the demonstration circuit boards is a nonrecurring engineering fee (NRE) to partially defray the hardware and software engineering costs associated with the development and provision of the demonstration circuit boards. The demonstration circuit boards may be operated for demonstration or evaluation purposes in non-residential areas only. austriamicrosystems’ understanding is that the customer’s products using the semiconductor integrated circuits shall be designed in compliance with all applicable requirements of the appropriate regulatory agency (e.g. FCC, ETSI, CE, JQA, etc.) and will, upon testing and release, be in compliance with these regulatory requirements. Operation of the customer’s products must not cause harmful interference and must accept any interference. This application shall not be offered for end-customer sale or lease until certification is obtained. Proprietary and Confidential 2 2 Block Diagram and Introduction This reference design is focused to enable fast evaluation of the usage if AS3911 in the automotive environment. The specific use case of a reader in door handles is the implemented wherein the space is limited with little compromise on the performance. This reference design features the following: • The AS3911 door handle board has several options’ to be used:5 Volt with USB operations • Vbat Standalone configurations with power line signaling • Small form factor; 11x107mm (dual layer & single side assembly board) Capacitive and inductive wakeup • USB operation to Graphical User Interface • Antenna tuning • 3,3V logic level UART Interface Vbat 5V LDO Vbat 3V3 5V LDO 3V3 USB Connector Power line signaling Micro Controller USB Differential SPI EMC Filter 5V Tuning Capacitor bank Matching NW Antenne coil Feedback loop AS3911 Blocking Cap for LDO’s of: VDD, AGD, VSPA, VSPRFP U2 Uchip UA EMC Filter Network Matching network Schematic level Proprietary and Confidential 3 2.1 Use of device The Device has three signalling LED’s. The power LED is close at the antenna and is immediate on when the device is powered. The other two LEDs are controlled by the micro controller and gives information about the software state. Power indicator LED Stand alone activity LED When powered by USB, this reader works under control of the Graphical user Interface (for details please refer to AS3911 AN Software user guide 1v0.pdf. 2.2 Stand-alone operation The device offers the option to direct a supply with an external supply. The pins are shown in picture below Proprietary and Confidential 4 Once powered, the micro controller will scan immediately for Tags. In case of a found Tag, the device signals the presence of a Tag with a sequence of eight pulses of alternating load over the power line. The frequency for the pulses is 2 kHz. The expected current consumption of the door handle module is at 150 mA. For detection of the pulses we recommend using a shunt of maximum 3,3 Ohm. Below scope pictures has been done with a 3,3 Ohm shunt resistor at 7 Volt supply. Interrogation stage Signal stage Vscope max = 500mV ==> Imax= 151 mA Time for Interrogation: 5ms Time for signaling: 4 ms Proprietary and Confidential 5 2.3 3.3 Volt UART Interface The UART Interface is located next to the micro controller and can be used with a 3.3 Volt interface. 2.4 Program Interface The program Interface for the Controller has the same pin out as the standard PIC programmer Kits thus can be used without adapter. 2.1 Schematic Proprietary and Confidential 6 Proprietary and Confidential 7 3 Gerber 3.1.1 Top layer 3.1.2 Bottom layer 3.1.3 Silk screen Proprietary and Confidential 8 3.2 Bill of Material Part Info Integrated Circuits (IC) Reference Footprint Producer AS3911 PIC24FJ64AGB002 AS1360-33 AS1360-50 SMD resistor IC1 IC2 IC3 IC40 QFN32 QFN28_6x6 SOT23 SOT23 austriamicrosystems Microchip austriamicrosystems austriamicrosystems 470R 10k 3k3 0R SMD capacitors 10u R1, R2, R4, R23, R50 R3 R5 R20, R21, R30, R40 R0402 R0402 R0402 R0402 Stackpole Electronics Yageo Yageo Yageo Digikey Digikey Digikey RMCF0402JT470RTR-ND 311-10KJRTR-ND 311-3.3KJRTR-ND 311-0.0JRTR-ND C20 C1, C3, C15, C28, C32, C33, C50, C51, C82 CP_SMD_A Nichicon Digikey 493-2351-2-ND 2u2 10n 10p 100p 6p8 12p 22p 47p 39p 270p 100n 18p 220p 680p SMD inductors 220n SMD transistors BSS138 SMD LED C0603 Taiyo Yuden C2, C6, C16, C19, C27, C31, C34, C52, C83 C4, C7 C5, C8 C9, C13 C10, C14 C11, C20 C12, C21 C17 C22, C23 C25 C35, C36 C37, C54 C40, C41, C42, C43 C0402 C0402 C0402 C0402 C0402 C0402 C0402 C0603 C0603 C0402 C0402 C0402 C0402 Yageo Yageo Yageo TDK Corporation Yageo Yageo Yageo TDK Corporation TDK Corporation TDK Corporation TDK Corporation TDK Corporation Yageo L1, L2 L0805 Q1 Distributor Distributor Number Digikey PIC24FJ64GB002T-I/ML-ND Digikey Digikey Digikey 587-2983-2-ND Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey 311-1042-2-ND 311-1014-2-ND 311-1024-2-ND 445-4887-2-ND 311-1016-2-ND 311-1018-2-ND 311-1021-2-ND 445-1276-2-ND 445-1286-2-ND 445-5942-2-ND 445-1238-2-ND 445-1251-2-ND 311-1030-2-ND Murata Digikey 490-5669-2-ND SOT23_N ON Semiconductor Digikey BSS138LT3GOSTR-ND D1, D2, D3 LED_Lumex _0402 Kingbright Corp 27.12 MHz Mechanical components USB_MICROB Not populated dnp Q1 XRCGB27 M120F3M0 0R0 Murata U3 Micro USB Hirose Electric C38, C55 ICP J3 UART Cap wakeup Cap wakeup J5 E1 E2 C0402 PLUG_THM D_STRIP5 PLUG_THM D_STRIP5 PIN1 PIN1 LED_LUMEX Oscillator Digikey 754-1104-2-ND Digikey 490-5581-2-ND Digikey Proprietary and Confidential H11634TR-ND 9 4 Version History Version 1.00 Date 29.12.2011 Change log Initial Version Originator tlu Copyright 2011, austriamicrosystems AG, Schloß Premstätten, 8141 Unterpremstätten, Austria. For further information please contact The Wireless Business Line Schloss Premstaetten A-8141 Unterpremstaetten AUSTRIA Tel: +43-(0)3136-500-5473 FAX: +43-(0)3136-500-4141 [email protected] Subject to change without notice Proprietary and Confidential 10