austriamicrosystems AG is now ams AG The technical content of this austriamicrosystems application note is still valid. Contact information: Headquarters: ams AG Tobelbaderstrasse 30 8141 Unterpremstaetten, Austria Tel: +43 (0) 3136 500 0 e-Mail: [email protected] Please visit our website at www.ams.com Te ch ni ca am lc s on A te G nt st il lv al id Hardware Description of AS399x “ROGER” - UHF RFID Reader System Demo Kit Reference Rev 1.5 March 2010 Proprietary and Confidential 1 lv al id 1 Introduction.......................................................................................................... 2 2 Hardware Description UHF board ......................................................................11 2.1 Schematic ................................................................................................................. 11 Top mounted ............................................................................................................................ 12 2.2 Top layer .................................................................................................................. 12 2.3 Bottom layer............................................................................................................. 13 2.4 Bill of Material ......................................................................................................... 14 3 PCB layer Information ........................................................................................15 4 Disclaimer...........................................................................................................16 am lc s on A te G nt st il 1 Introduction The AS399x UHF RFID Reader System Demo Kit supports the ISO 18000-6b and EPC Generation 2 standards. The aim of the development kit is to demonstrate the performance and the features of the AS399x UHF RFID reader chip and to enable customers to develop their own application fast. The AS399x UHF RFID Reader System is a single PCB solution offering two configurations: • A UHF RFID reader stand alone operation aided by the on board microcontroller • A direct access operation for development purposes with disabled MCU where the host system directly controls the AS399x using a pin header interface. The operational RF part can be used to develop customized software for controlling the AS399x. An access to the IO pins for an external microcontroller is provided to speed up the design phase of an UHF RFID reader application. Key Features • • • • • ca 1.1 Te ch ni Reading and writing UHF RFID tags Communication with host computer using the USB-HID or UART interface USB HID device (automatically installed on host side) Low cost 8- bit micro controller is used Controller software written in C which can easily ported to a different controller type. • Host software (AS399x Reader Suite) written in C++ and MFC Proprietary and Confidential 2 2 Short Description Picture 1: ROGER – PCB Te ch ni ca am lc s on A te G nt st il lv al id The “ROGER” UHF RFID Reader System is designed for medium range tag detection and is optimized regarding PCB area and power consumption. To minimize costs no special RF connectors are required. The connection to the antenna is established by a MMCX connector. For powering up the UHF RFID Reader System an auxiliary power supply is used. For the communication with the host system the USB interface is used. After power up the internal registers of the reader chip are configured with default values which enables the reader system to be functional right from the beginning. Proprietary and Confidential 3 Table 1: Port 0 Pin P1.0 P1.1 P1.2 P1.3 P1.4 P1.5 P1.6 P1.7 Signal IO0 IO1 IO2 IO3 IO4 IO5 IO6 IO7 Table 2: Port 1 and and and and and and and and Ctrl Ctrl Ctrl Ctrl Ctrl Ctrl Ctrl Ctrl Bit Bit Bit Bit Bit Bit Bit Bit Description Interface CLK Output Device Enable Output LED Output Not used Not used Not used Not used Not used ni Signal CLK EN LED - Description IO Data, Address IO Data, Address IO Data, Address IO Data, Address IO Data, Address IO Data, Address IO Data, Address IO Data, Address ch Pin P2.0 P2.1 P2.2 P2.3 P2.4 P2.5 P2.6 P2.7 Description Not used Not used Not used External Interrupt Input UART Transmit Pin UART Receive Pin Not used System Clock Input al id Signal IRQ TX RX SCLK lv Pin P0.0 P0.1 P0.2 P0.3 P0.4 P0.5 P0.6 P0.7 Detailed Description am lc s on A te G nt st il 2.1.1 Port Definitions ca 2.1 Te Table 3: Port 2 Proprietary and Confidential 4 Signal RESET Description Not used Not used Not used Not used Not used Not used Not used Output for resetting the MCU Table 4: Port 4 Signal GND D+ DVDD REGIN VBUS RST C2D Description GND Pin USB Data + Signal USB Data - Signal VDD Pin Not used USB Power In Reset Pin Debugging Interface am lc s on A te G nt st il Pin 7 8 9 10 11 12 13 14 lv Pin P4.0 P4.1 P4.2 P4.3 P4.4 P4.5 P4.6 P4.7 al id Note: Port 3 is not used. Table 5: Other uC Pins 2.2 AS399X Pinout: Te ch ni ca Pinout of AS399x Picture 2: AS399x Pinout Proprietary and Confidential 5 2.3 C8051F340 Pin out am lc s on A te G nt st il lv al id The pinout from Silabs microcontroller C8051F340 is shown below. Picture 3: C8051F340 Pin out [Silabs 2006] 2.4 Power Supply 3.6 V power jack (2.1X5.5MM). The supply is guarded by a polyswitch (1.5A). 2.5 USB Connector RS232 Connector ni 2.6 ca USB is used for communication with the host. No external matching and pull down resistors are needed, since all parts are integrated in the microcontroller. ch For debugging, the controller board has solder pads to connect an external RS232 circuit. Power for the external circuit is delivered through the connector. Debugging Connector Te 2.7 In the following picture a special interface is highlighted which is used to directly connect the Silabs USB Debug Adapter. The circuit is taken from the Silabs Development Kit data sheet [SilabsDK 2006]. The resistor R3 can be used to supply the board via the debugging connector. Proprietary and Confidential 6 am lc s on A te G nt st il lv al id Silabs Debug Interface Picture 4: Schematic - Debug Interface 2.8 Supply Concept Te ch ni ca To filter out noise on the USB supply voltage a ferrite (L1) and two capacitors (C52, C53) are used. Additionally, each AS399X V DD pin is featured with two capacitors (10 nF & 2.2 µF). The microcontroller supply VDD (pin 10) only needs one 100nF capacitor (C1). During power down mode the majority of the AS399x reader chip is switched off but still generates a 3.3V supply voltage (VDD_D = pin 38) which supplies the microcontroller unit (MCU). This mode is configured by the resistor R7 (10kΩ) at OAD2 (pin 30) to GND. After start up the microcontroller has to pull the AS399X enable pin (EN = pin 39) to high in order to start the operation of the AS399X finalizing the power up sequence. 4 different voltages are generated on the ROGER Demo Kit: 1. 3.3 V (generated by Silabs MCU) 2. 4.5 V (generated by AMS AS1364 LDO) 3. 5.0 V (generated by AMS AS1326A DCDC Step Up Converter) 4. 5.5 V (generated by AMS AS1340 Boost Converter) Proprietary and Confidential 7 2.9 Microcontroller Reset Circuit am lc s on A te G nt st il lv al id The reset circuit needs only two capacitors (C2, C3) for power on reset. A pull- up resistor (R1), a series resistor (R2) and a push button (S1) for resetting during normal operation is used (see Picture 5). To enable a reset trough the software, resistor R4 is connected between port pin P4.7 and the reset pin (/RST = pin 13). If the microcontroller needs to be reset, the software has to write a logic zero to P4.7. Picture 5: Reset Circuit 2.10 Oscillator Circuit Te ch ni ca The AS399X can be used with a conventional quartz crystal or a TCXO. The crystal should have an accuracy of 10ppm. Most crystals do not provide this high accuracy for this reason a TCXO is recommended. Besides good frequency stability a TCXO inherently provides better temperature stability. Picture 6: Schematic - Oscillator Circuit Proprietary and Confidential 8 2.11 VCO Concept. To generate the high frequency carrier signal for the communication with the tag (840 MHz – 960 MHz) the internal VCO is used and thus only a few passive components are needed. The external loop filter components need to be calculated for each parameter set of loop filter current, reference frequency and charge pump current. For this particular reference design following settings was used: al id 915 MHz 1.2 mA charge pump current 50 kHz reference frequency Internal VCO In following table, one can also find other settings for reference: 20 MHz / V 20 MHz / V 20 MHz / V Reference Frequency [kHz] 50 50 100 Charge Pump Current [mA] C1 [pF] R1 [kΩ] C2 [nF] R2 [kΩ] C3 [pF] 1.2 0.6 1.2 220 120 150 27 56 27 3.3 1.5 1.8 56 110 47 110 56 68 am lc s on A te G nt st il VCO lv • • • • Picture 7: Loop Filter Circuit ch ni ca Table 6: Loop Filter Reference Settings Te 2.12 LED For an easy and fast functional check, an external LED with a current limitation resistor is included. During normal operation, the LED is continuously flashing. Proprietary and Confidential 9 2.13 Serial RS232 Interface For debugging an external RS232 interface may be used. 2.14 High Frequency RFID Output am lc s on A te G nt st il lv al id The 0 dBm differential outputs (Rfopx, Rfonx) are used. The differential outputs need to be converted to single- ended outputs. This is done by a Balun (Balanced/ Unbalanced). The output signal is then routed to the external GaAs power amplifier (U11) SPA-2118. In order to attenuate high order intermods a ceramic low pass filter (U6) is placed in the Tx path. Picture 8: Schematic - UHF RFID Output Path 2.15 Decoupling Tx/Rx Te ch ni ca To separate transmit and receive path a directional coupler (RCP890A05) is used. Proprietary and Confidential 10 3 Hardware Description UHF board Schematic Te ch ni ca am lc s on A te G nt st il lv al id 3.1 Please note that the components may change. Please review the BOM for latest Information Proprietary and Confidential 11 am lc s on A te G nt st il lv al id Top Mounted Picture 9: Assembly Top Top Layer Te ch ni ca 3.2 Picture 10: Top Layer Proprietary and Confidential 12 Bottom Layer am lc s on A te G nt st il lv al id 3.3 Te ch ni ca Picture 11: Bottom Layer Proprietary and Confidential 13 Part Info Reference Footprint ordering information Integrated Circuits (IC) AS3991 AS1364-AD_TDFN8 SPA-2118 AS1340_TDFN8 AS1326A_TDFN10 U4 U8, U10 U11 U7 U9 QFN 64 9x9 0 0 0 0 2u2 10uF U1 TQFP 48 D1, D4, D5 D2 D3 0805 SOD123_MM D_SMA Digikey/160-1423-1-ND Digikey/MBR0540T1GOSCT-ND Digikey/S2KADICT-ND R1, R2, R4, R23, R24 R11,R12 R14 R15 R16;R28 R17, R20, R27, R29 R18 R19 R21 R22, R36 R25,R26, R6 R3 R30, R10 R5 R7 R8 R9 1608_0603_MM 1608_0603_MM 1005_0402_MM 1608_0603_MM 1608_0603_MM 1608_0603_MM 1608_0603_MM 1608_0603_MM 1608_0603_MM 1608_0603_MM 1608_0603_MM 1608_0603_MM 1608_0603_MM 1608_0603_MM 1005_0402_MM 1005_0402_MM 1005_0402_MM Standard part Standard part Standard part Standard part Standard part Standard part Standard part Standard part Standard part Standard part Standard part Standard part Standard part Standard part Standard part Standard part Standard part C12, C28 C13 C19; C54, C58 C80 C57, C59,C64, C65 C20, c21 C25 C56 C3 C31 C32 1608_0603_MM 1608_0603_MM 1608_0603_MM Standard part Standard part Digikey/490-3303-1-ND 0805 1005_0402_MM Standard part 1005_0402_MM 1608_0603_MM 1005_0402_MM 1005_0402_MM Standard part Standard part Standard part Standard part X1 3.2x2.5 am lc s on A te G nt st il 20 MHZ TCXO C8051F340 Other semiconductors LED MBR0540 S2KA-13 SMD resistor 1k 100 0R 6k8 34k 10k 10 30k 330 100k nc 0R 27k 820R 10k 0R 56k SMD capacitors 12pF nc 4u7 10u 4u7 47pF 110p 100p 1u 3n3 220p AS3991-BQFT austriamicrosystems austriamicrosystems austriamicrosystems austriamicrosystems Digikey/ 631-1073-1-ND Deqtron KDS Digikey: 336-1298-ND C4, C9, C10, C15, C17, C23, C26, C33, C37, C46, C47, C49, C55 1005_0402_MM C41;C73 CPMP3528_B_MM Standard part C5;C8, C11, C14, C16, C24, C27, C34, C40, C42, C43, C44, C45, C48 C50, C52, C1, C2, C22 C51 C53 C60 C61 C62 C63 C67, C68 C69 C70 C71 C72 C74 C75 C76, C77 C78 C79, C30 Standard part 1005_0402_MM 1005_0402_MM 1608_0603_MM CPMP7243_D_MM CPMP6032_C_MM CPMP6032_C_MM 1608_0603_MM 1608_0603_MM 1608_0603_MM 1608_0603_MM 1608_0603_MM 1608_0603_MM 1608_0603_MM 1608_0603_MM 1608_0603_MM 1005_0402_MM 1005_0402_MM 1005_0402_MM L1 L3, L5 L4 L7 L8 L9 2012_0805_MM 1608_0603_MM 1608_0603_MM Würth Würth 2012_0805_MM ch ni ca 10n 100n 220p 100uF 33uF/10V 100uF/10V 330n 10nF 8p2 1n2 82p 1n 39p 100p 6p8 220p 100n n.m. SMD inductor nc 33n 2n2 4.7uH 3.3uH (4.1µ) 33n Coupler_RCP890.. Te al id Bill of Material lv 3.4 Balun 50/100 Mechanical components Switch USB Connector Power Jack MMCX Connector Other componets Low pass Filter Polyswitch not mounted Standard part Standard part Standard part Standard part Digikey/PCE3164DKR-ND Digikey/478-3320-1-ND Standard part Standard part Standard part Standard part Standard part Standard part Standard part Standard part Standard part Standard part Standard part Standard part 0 Würth/744902133 Würth/744902022 Digikey/732-1097-1-ND Würth/74476013C Würth/74476013C Deqtron COUPLER_RCP890A05 Richardson/BFI-Optilas Würth/748431090 BALUN-0900BL18B100 T2 T3,T4 S1,S2 J11 J38 SMD Type 0 Farnell: 1201424 Buerklin:72F2280 Digikey/CP-002AHPJCT-ND J1 Samtec:MMCX-J-P-H-ST-EM1 U6 F1 J10, J13, J14, J15,J16,J17,J18,J19;2,J20,J21;J22,J23, J24,J25,J26,J27,J28,J29;3,J30,J31,J32, Würth/748131009 Digikey/NANOSMDC150FTR-ND not mounted Table 7: BOM Proprietary and Confidential 14 Name Dimensions Edges PCB Material PCB Strength Layer Count AS399x UHF Board 90 x 49 mm milled FR4 Dielectric DE117 0.51 mm 2 Attached files Gerber RS274x / Excellon PCB layer setup Copper Plated Pre Preg Drill Files Thruhole Data for Drills und Holes thruhole.tap Top Side Layer 01 Core Material Bottom Side Layer 4 Thickness [µm] (36) 43µm thickness 500µm thickness Dielectric Constant 4.7 (36) 43µm thickness Layer Layer Name Comments *.top Top Side Layer 1 36 (43 final thickness) DE117 Dielectric constant 4,7 500 36 (43 final thickness) *.bot Bottom Side Layer 4 Table 8: PCB Layer Properties Te ch ni Copper plated ROGER_1V2.top ROGER_1V2.bot ROGER_1V2.smt ROGER_1V2.smb ROGER_1V2.sst ROGER_1V2.drd ca Material Top Side Layer: Layer 01 Bottom Side Layer: Layer 04 Solder Stop Top Solder Stop Bottom Silk Screen Top Dimension, Print Info am lc s on A te G nt st il Gerber files lv Format al id 4 PCB Layer Information Proprietary and Confidential 15 5 Disclaimer am lc s on A te G nt st il lv al id Devices sold by austriamicrosystems AG are covered by the warranty and patent identification provisions appearing in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. austriamicrosystems AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for each application. The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However, austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of austriamicrosystems AG rendering of technical or other services. Copyright © 2009, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstätten, Austria. ca For further information please contact ch ni The Wireless Business Line Schloss Premstaetten A-8141 Unterpremstaetten AUSTRIA Tel: +43-(0)3136-500-5473 FAX: +43-(0)3136-500-4141 [email protected] Te Subject to change without notice Proprietary and Confidential 16