Users Guide SM1211 RF module ADVANCED COMMUNICATIONS & SENSING SM1211 RF Module User s Guide Revision 1.0 August 2007 © 2007 Semtech Corp. www.semtech.com 1 Users Guide SM1211 RF module ADVANCED COMMUNICATIONS & SENSING Table of Contents 1 2 3 4 5 6 Introduction......................................................................................................................................... 3 Getting Started.................................................................................................................................... 3 Schematics ......................................................................................................................................... 4 Layout ................................................................................................................................................. 4 BOM..................................................................................................................................................... 5 References .......................................................................................................................................... 5 Table of Figures Figure 1: SM1211 Overview (top view) .............................................................................................................. 3 Figure 2: SM1211 Schematics........................................................................................................................... 4 Figure 3: SM1211 Layers Description (cut view) ................................................................................................ 4 Figure 4: SM1211 Layout (top view) .................................................................................................................. 5 Figure 5: SM1211 BOM..................................................................................................................................... 5 Revision 1.0 August 2007 © 2007 Semtech Corp. www.semtech.com 2 Users Guide SM1211 RF module ADVANCED COMMUNICATIONS & SENSING 1 Introduction The purpose of this tool is to provide a development platform of the SX1211. User can build his application prototype by simply connecting the module to his target microcontroller and start developing his application software. The SM1211 module integrates the SX1211 reference design (chip + external components) plus miscellaneous useful connectors. Note that this module is also used for the SX1211 Starter Kit. 2 Getting Started As illustrated in figure below, the SM1211 integrates several parts: w Ref design: This section includes the chip but also all the external components in an optimized BOM and form factor. When user wants to incorporate the SX1211 on his PCB, it is strongly recommended that this reference design (i.e. schematics, placement, layout, BOM, etc...) is copied as is in final application board to guarantee optimum performance and lowest development time and design effort. w uC connector: to connect the RF chip s control lines to the uC. (Cf SX1211 datasheet for uC connections guidelines). w SMA connector: SMA Cable or antenna connection. Each board is delivered with its ¼ wave SMA antenna. w VDD jumper: to monitor current consumption and/or apply independent power supply to the module. When VDD jumper is on, RF module s power supply should be supplied on the uC connector. SMA connector Ref. design VDD jumper uC connector Figure 1: SM1211 Overview (top view) Software drivers are available in the API TN8000.18 on Semtech s website. These are implemented on Semtech s XE8000 microcontrollers but are written in C and hence easily portable to other targets. Revision 1.0 August 2007 © 2007 Semtech Corp. www.semtech.com 3 Users Guide SM1211 RF module ADVANCED COMMUNICATIONS & SENSING 3 Schematics Ref. Design area Figure 2: SM1211 Schematics C12 is a DC blocker protection for the SAW filter. It has been added for debug/dev purposes, it is not needed for direct antenna connection. Please note that C10 and C11 are not used. 4 Layout As illustrated in figures below, the layout has the following characteristics: ü very compact ref design (9x19mm) => can be easily inserted even on very small PCBs ü standard PCB technology (2 layers, 1.6mm, std vias & clearance) => low cost ü performance quasi insensitive to dielectric thickness => quasi zero effort portability to other PCB technology (thickness, # of layers, etc...) The layers description is illustrated in figure below. Signal (35um) Isolation (FR4, 1.6mm) Ground plane Figure 3: SM1211 Layers Description (cut view) Revision 1.0 August 2007 © 2007 Semtech Corp. www.semtech.com 4 Users Guide SM1211 RF module ADVANCED COMMUNICATIONS & SENSING The layout itself is illustrated in figure below. Please contact Semtech for gerber files. 9mm 19mm Figure 4: SM1211 Layout (top view) 5 BOM Ref U1 U2 Q1 Value 868MHz 915MHz SX1211 869MHz 915MHz 12.8MHz Tol (+/-) Techno Transceiver IC SAW Filter 15ppm at 25°C AT-cut 20ppm over -40/+85°C 2ppm/year max. R1 1% R2 6.8k 1% C1 1uF 15% X5R C2 1uF 15% X5R C3 220nF 10% X7R C4 47nF 10% X7R C5 100nF 10% X7R C6 10nF 10% X7R C7 680pF 10% X7R C8 1.8pF 0.25pF NPO C9 22pF 5% NPO L1, L2 8.2nH 6.8nH 0.2nH Wire wound L3 100nH 5% Wire wound L4 8.2nH 5% Multilayer C10,C11 NC C12* 47pF 5% NPO *Not part of the ref. design (not required for direct antenna connection). Size Comment TQFN-32 3.8*3.8mm 5.0*3.2mm Part# Temex S142/S110 Fundamental, Cload=15pF Part# Siward SX5032 0402 0402 0402 0402 0402 0402 0402 0402 0402 0402 0402 0402 0402 0402 0402 0402 PA regulator Loop filter VDD decoupling Top regulator decoupling Digital regulator decoupling PA regulator decoupling VCO regulator decoupling Loop Filter Loop Filter Matching DC block and L4 adjust VCO tank inductors PA Choke Matching DC block Figure 5: SM1211 BOM 6 References Ø [1] SX1211 Datasheet Ø [2] TN8000.18 API Revision 1.0 August 2007 © 2007 Semtech Corp. www.semtech.com 5 Users Guide SM1211 RF module ADVANCED COMMUNICATIONS & SENSING © Semtech 2007 All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. 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