RN-171-DS MICROCHIP | Alldatasheet
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Technical content
www.rovingnetworks.com Version 3.21 10/2/2012 1 RN-171-DS RN-171 802.11 b/g Wireless LAN ModuleFeatures • FCC/CE/IC certified 2.4-GHz IEEE 802.11b/g transceiver • Small form factor: 1050 x 700 x 130 mil • Configurable transmit power: 0 to 10 dBm • RF pad connector for antennas • Certified antennas: chip antenna, 4” dipole, PCB trace, and wire antenna • Ultra-low power: 4-uA sleep, 38-mA Rx, 120-mA Tx at 0 dBm • High throughput: 921 Kbps TX, 500 Kbps RX data rate with TCP/IP and WPA2 over UART, up to 2 Mbps over SPI slave • 8-Mbit flash memory and 128-KB RAM • 10 general-purpose digital I/O pins • 8 analog sensor interfaces • Real-time clock for wakeup and time stamping • Accepts 3.3-V regulated power supply or 3-V battery • Supports ad hoc and infrastructure networks • Complete on-board TCP/IP networking stack • Environmentally friendly: RoHS compliant Applications • Remote equipment monitoring • Telemetry • Industrial sensors and home automation controls • Home automation 128-KB RAM 2.4-GHz Radio 2.4-GHz PA Crypto accelerator 32-Bit CPU 802.11 b/g MAC/PHY ADC 2-MB ROM Timers SPI GPIO SDIOSensor Interface 2-KB NVM Pwr Mgmt Flash Memory SPI GPIO UART VDD IN VDD BATT
2.4 GHz
www.rovingnetworks.com Version 3.21 10/2/2012 4 RN-171 TYPICAL APPLICATION SCHEMATIC Figure 2 shows a typical application schematic with a battery boost circuit; Figure 3 shows a typical schematic with a linear regulator. Figure 2. Application Schematic with Battery Boost Circuit
www.rovingnetworks.com Version 3.21 10/2/2012 7 RN-171 700 mil 1,050 mil 35 mil 150 mil 135 mil 35 mil 50 mil 185 mil 185 mil Pad Dimensions: 40 x 90 mil (rounded ends)
www.rovingnetworks.com Version 3.21 10/2/2012 8 RN-171 DESIGN CONCERNS The following sections provide information on designing with the RN-171 module, including antenna design, solder reflow, boost regulator, etc. Antenna Design The RN-171 supports several antenna designs, including a PCB trace antenna, chip antenna, wire antenna, and U.FL connector. Antenna Feed Antenna Ground
www.rovingnetworks.com Version 3.21 10/2/2012 9 RN-171 The trace from the RF pad to the antenna feed should be 12 mils thick on a 4-layer PCB to achieve 50 ohms of impedance matching as shown in Figure 7. Figure 7. Trace from RF Pad to Antenna Feed Chip Antenna If your design uses a chip antenna, Roving Networks recommends the 2450AT42A100 manufactured by Johanson. Refer to the antenna’s data sheet for additional information such as dimensions, mounting considerations, and radiation patterns. Figure 8 shows the antenna dimensions. 12-mil Thick Trace from RF Pad to Antenna Feed
www.rovingnetworks.com Version 3.21 10/2/2012 11 RN-171
Figure 12. U.FL Connector
Figure 13. Boost Regulator Circuit
www.rovingnetworks.com Version 3.21 10/2/2012 15 RN-171 EN 301489-17 V2.1.1 (05/2009) SAFETY EN 60950-1:2006+A11:2010 EN 50371 2002-03 RoHs Compliant
www.rovingnetworks.com Version 3.21 10/2/2012 16 RN-171 Roving Networks, Inc. 102 Cooper Court Los Gatos, CA 95032 +1 (408) 395-5300 www.rovingnetworks.com