RN-41-DS RN-41/RN-41-N Class 1 Bluetooth Module Features Fully qualified Bluetooth version 2.1 module, supports version 2.1 +
Enhanced Data Rate (EDR) Backwards-compatible with Bluetooth version 2.0, 1.2, and 1.1 Postage stamp sized form factor, 13.4 mm x 25.8 mm x 2 mm Low power (30 mA connected, < 10 mA sniff mode) UART (SPP or HCI) and USB (HCI only) data connection interfaces Sustained SPP data rates: 240 Kbps (slave), 300 Kbps (master) HCI data rates: 1.5 Mbps sustained, 3.0 Mbps burst in HCI mode Embedded Bluetooth stack profiles included (requires no host stack):
GAP, SDP, RFCOMM, and L2CAP protocols, with SPP and DUN profile support Bluetooth SIG qualified, end product listing Castellated SMT pads for easy and reliable PCB mounting Class 1 high power amplifier with on board ceramic RF chip antenna
(RN-41) or without antenna (RN-41-N) Certifications: FCC, ICS, CE Environmentally friendly, RoHS compliant Applications Cable replacement Barcode scanners Measurement and monitoring systems Industrial sensors and controls Medical devices Asset tracking Description The RN-41 module is a small form factor, low power, class 1 Bluetooth radio that is ideal for designers who want to add wireless capability to their products without spending significant time and money developing Bluetooth-
specific hardware and software. The RN-41 supports multiple interface protocols, is simple to design in, and is fully certified, making it a complete embedded Bluetooth solution. With its high-performance, on-chip antenna and support for Bluetooth EDR, the RN-41 delivers up to a 3-Mbps data rate for distances up to 100 meters. The RN-41 is also available without an antenna (RN-41-N). Figure 1. RN-41 Block Diagram www.rovingnetworks.com Version 3.3r 10/9/2012 1 RN-41-DS OVERVIEW Baud rate speeds: 1,200 bps up to 921 Kbps, non-standard baud rates can be programmed Class 1 radio, 330 (100 m) range, 15 dBm output transmitter, -80 dBm typical receive sensitivity Frequency 2,402 ~ 2,480 MHz FHSS/GFSK modulation, 79 channels at 1-MHz intervals Secure communication, 128-bit encryption Error correction for guaranteed packet delivery Configuration via the local UART and over-the-air RF Auto-discovery/pairing does not require software configuration (supports instant cable replacement) Auto-connect master, I/O pin (DTR), and character-based trigger modes The modules moisture sensitivity level (MSL) is 1. Table 1 shows the modules size and weight. Table 1. Module Size & Weight Parameter Size Weight RN-41 13.4 x 25.8 x 2 0.055 RN-41-N 13.4 x 19 x 2 0.020 Units mm Oz. Tables 2 through 5 provide detailed specifications for the module. Table 2. Environmental Conditions Parameter Temperature Range (Operating) Temperature Range (Storage) Relative Humidity (Operating) Relative Humidity (Storage) Table 3. Electrical Characteristics Parameter Supply Voltage (DC) RX Supply Current TX Supply Current Average Power Consumption Standby/Idle (Default Settings) Connected (Normal Mode) Connected (Low-Power Sniff) Standby/Idle (Deep Sleep Enabled) Value
-40o C ~ 85o C
-40o C ~ 85o C 90%
90%
Min. 3.0 250 Typ. 3.3 35 65 25 30 8 2.5 Max. 3.6 60 100 Units V mA mA mA mA mA mA www.rovingnetworks.com Version 3.3r 10/3/2012 2 RN-41-DS Table 4. Radio Characteristics Parameter Sensitivity at 0.1% BER RF Transmit Power Initial Carrier Frequency Tolerance 20-dB Bandwidth for Modulated Carrier Drift (Five Slots Packet) Drift Rate f1avg Maximum Modulation f2avg Minimum Modulation Frequency
(GHz) 2.402 2.441 2.480 2.402 2.441 2.480 2.402 2.441 2.480 2.402 2.441 2.480 2.402 2.441 2.480 Min. Typ. Max.
15.0 15.0 15.0
140 140 140 140 140 140
-80
-80
-80 16.0 16.0 16.0 5 5 5 900 15 13 165 165 165 190 190 190
-86
-86
-86 75 75 75 1000
175 175 175
Bluetooth Specification
-70 20 75 1000 40 20
> 140 115 Units dBm dBm dBm dBm dBm dBm kHz kHz kHz kHz kHz kHz kHz kHz kHz kHz kHz kHz Table 5. Digital I/O Characteristics 3.0 V VDD 3.3 V Input Logic Level Low Input Logic Level High Output Logic Level Low Output Logic Level High All I/O pins (Except reset) Default to Weak Pull Down Min.
-0.4 0.7 VDD
VDD - 0.2 Typ.
+0.2
+1.0 Max.
+0.8 VDD + 0.4 0.2
+5.0 Units V V V V uA www.rovingnetworks.com Version 3.3r 10/3/2012 3 RN-41-DS Figure 2 shows the pinout and Table 6 describes the pins. Figure 2. RN-41/RN-41-N Pinout Table 6. Pin Description Pin Name Description Default 1 2 3 4 5 6 7 8 9 10 11 12 13 14 GND SPI_MOSI GPIO6 GPIO7 Ground Programming only Set Bluetooth master (high = auto-master mode) Set baud rate (high = force 9,600, low = 115 K or firmware setting) Active-low reset RESET Programming only SPI_CLK PCM_CLK PCM interface PCM_SYNC PCM interface PCM_IN PCM interface PCM interface PCM_OUT 3.3-V regulated power input VDD GND Ground UART receive input UART_RX UART_TX UART transmit output No connect Input to RN-41with weak pulldown Input to RN-41 with weak pulldown Input to RN-41 with 1K pullup No Connect No Connect No Connect No Connect No Connect Input to RN-41 High level output from RN-41 www.rovingnetworks.com Version 3.3r 10/3/2012 4 RN-41-DS Pin Name Description Default 15 16 17 18 19 20 21 22 23 24 25 - 27 28 - 29 30 31 32 33 34 35 UART_RTS UART RTS, goes high to disable host transmitter UART_CTS UART CTS, if set high, it disables transmitter USB_D+
USB port USB_D-
GPIO2 GPIO3 GPIO5 GPIO4 SPI_CSB SPI_MISO NC GND AIO0 GPIO8 GPIO9 GPIO10 GPIO11 AIO1 USB port Status, high when connected, low otherwise Auto discovery = high Status, toggles based on state, low on connect Set factory defaults Programming only Programming only RF pad, keep all traces and planes clear Ground Optional analog input Status (RF data RX/TX) I/O I/O (remote DTR signal) I/O (remote RTS signal) Optional analog input Low level output from RN-41 Low level input to RN-41 1.5 K pullup activated when USB port is ready (~500 ms after reset) Output from RN-41 Input to RN-41 with weak pulldown Output from RN-41 Input to RN-41 with weak pulldown No connect No connect Not used Output from RN-41 Input to RN-41 with weak pulldown Input to RN-41 with weak pulldown Input to RN-41 with weak pulldown Not Used Figure 3 shows the modules physical dimensions. Figure 3. RN-41/RN-41-N Physical Dimensions www.rovingnetworks.com Version 3.3r 10/3/2012 5 RN-41-DS TYPICAL APPLICATION SCHEMATIC Figure 4 shows a typical application schematic. Figure 4. Application Schematic www.rovingnetworks.com Version 3.3r 10/3/2012 6 RN-41-DS DESIGN CONCERNS The following sections provide information on designing with the RN-41 module, including radio interference, factory reset, solder reflow profile, connection status, etc. www.rovingnetworks.com Version 3.3r 10/3/2012 7 RN-41-DS Reset Circuit The RN-41 contains a 1k pullup to VCC, and the reset polarity is active low. The modules reset pin has an optional power-on-reset circuit with a delay, which should only be required if the input power supply has a very slow ramp or tends to bounce or have instability on power up. Often a microcontroller or embedded CPU I/O is available to generate the reset once power is stable. If not, designers can use one of the many low-cost power supervisor chips currently available, such as the MCP809, MCP102/121, and Torex XC61F. Factory Reset Using GPIO4 Roving Networks recommends that designers connect the GPIO4 pin to a switch, jumper, or resistor so it can be accessed. This pin can be used to reset the module to its factory default settings, which is critical in situations where the module has been misconfigured. To reset the module to the factory defaults, GPIO4 should be high on power-up and then toggle low, high, low, high with a 1 second wait between the transitions. Connection Status GPIO5 is available to drive an LED, and it blinks at various speeds to indicate status (see Table 7). GPIO2 is an output that directly reflects the connection state as shown in Table 8. Table 7. GPIO5 Status GPIO5 Status Toggle at 1 Hz Toggle at 10 Hz High Table 8. GPIO2 Status Description The module is discoverable and waiting for a connection. The module is in command mode. The module is connected to another device over Bluetooth. GPIO2 Status Description High Low HCI Mode The module is connected to another device over Bluetooth. The module is not connected over Bluetooth. Roving Networks offers the Host Controller Interface (HCI) mode in addition to the standard operational mode of its Bluetooth modules (standard mode refers to the on-board stack running on the module). In HCI mode, the on-board stack is bypassed and the module is put in a state that runs the Bluetooth baseband. The HCI provides a command reference interface to the baseband controller and the link manager, and provides access to the hardware status and control registers. This interface provides a uniform method for accessing the Bluetooth baseband capabilities. In this mode, the Bluetooth stack is no longer on-board the module. It is offloaded to the interfacing host processor. The Bluetooth module is used as a radio, performing the lower level MAC functionalities, while the application stack runs on the host processor. Using the module in HCI mode allows designers to implement profiles that are not natively supported on the Bluetooth module. NOTE:
HCI mode requires a separate firmware build that must be loaded into the modules flash at the factory. Is not upgradeable in the field. Roving Networks offers HCI mode in two hardware interfaces:
HCI over UART HCI over USB www.rovingnetworks.com Version 3.3r 10/3/2012 8 RN-41-DS HCI over UART In this mode, the hardware interface between the host processor and the Bluetooth module is the UART. You must interface the flow control signals between the host processor and the Bluetooth module for the HCI interface to work. Failure to do so can cause the host processor and the Bluetooth module to become out of sync and break the Bluetooth link. HCI over USB In this mode, the hardware interface between the host processor and the Bluetooth module is the USB. In this architecture, the Bluetooth module is the USB slave and the host processor is the USB host. Using the USB interface offers the advantage of a faster data link between the Bluetooth module and the host processor. With this architecture, it is possible to achieve Bluetooths theoretical maximum throughput of 3 Mpbs. Using the SPI Bus to Upgrade the Flash Memory While not required, this bus is very useful for configuring the Bluetooth modules advanced parameters. The bus is required when upgrading the modules firmware. The typical application schematic shown in Figure 4 shows a 6-pin header that can be implemented to gain access to this bus. A minimum-mode version might simply use the SPI signals (4 pins) and obtain ground and VCC from elsewhere in the design. Minimizing Radio Interference When laying out the carrier board for the RN-41 module, the areas under the antenna and shielding connections should not have surface traces, ground planes, or exposed vias (see Figure 5). For optimal radio performance, the RN-41 modules antenna end should protrude at least 5 mm beyond any metal enclosure. Figure 5. Minimizing Radio Interference Because the RN-41-N does not contain an antenna, it does not carry regulatory approvals. www.rovingnetworks.com Version 3.3r 10/3/2012 9 RN-41-DS If designers use Roving Networks recommended design, they can file for a permissible antenna change and use Roving Networks regulatory approvals. Roving Networks recommends the Yageo chip antenna for the RN-41-N module. For detailed information on this antenna, refer to the Yageo chip antenna data sheet on the Support page of the Roving Networks website at http://www.rovingnetworks.com/Support_Overview. If designers choose to use another antenna, they must go through the regulatory approval process. Solder Reflow Profile The lead-free solder reflow temperature and times are:
Temperature230 C, 30 - 40 seconds, peak 250 C maximum Preheat temperature165 15 C, 90 to 120 seconds TimeSingle pass, one time www.rovingnetworks.com Version 3.3r 10/3/2012 10 RN-41-DS COMPLIANCE INFORMATION Table 9 describes the modules compliance information. Table 9. Compliance Information (RN-41 Only) Category Country Radio EMC Bluetooth Environmental USA FCC ID:
Europe Canada IC Canada ID:
USA Europe LISTED RoHS ORDERING INFORMATION Table 10 provides ordering information. Table 10. Ordering Information Standard FCC CFR47 Part 15 C, para 15.247 T9J-R41-1 EN 300 328-1 EN 300 328-2 2.4GHz IC RSS-210 low power comm. device 6514A-RN411 FCC CFR47 Part 15 subclass B EN 55022 Class B radiated EN61000-4-2 ESD immunity EN61000-4-3 radiated field EN61000-4-6 RF immunity EN61000-4-8 power magnetic immunity B013180 RoHS compliant Part Number Description RN-41 RN-41-HCI RN-41-USB RN-41-HID RN-41-N RN-41-N-HCI RN-41-N-USB RN-41-N-HID Standard Application firmware (SPP/DUN Master and Slave). HCI firmware (HCI over H4 UART). USB firmware (HCI over USB port, slave device at 12-Mbps rate). HID firmware supporting HID device and SPP profiles. Standard application firmware (SPP and DUN) without antenna. HCI firmware (HCI over H4 UART) without antenna. USB firmware (HCI over USB port, slave device at 12-Mbps rate) without antenna. HID firmware supporting HID device and SPP profiles without antenna. For other configurations, contact Roving Networks directly. www.rovingnetworks.com Version 3.3r 10/3/2012 11 RN-41-DS Go to http://www.rovingnetworks.com for current pricing and a list of distributors carrying Roving Networks products. www.rovingnetworks.com Version 3.3r 10/3/2012 12 RN-41-DS Federal Communication Commission Interference Statement This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. in accordance with This equipment generates, uses and can radiate radio frequency energy and, if not installed and used to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one of the following measures:
instructions, may cause harmful interference the
. Reorient or relocate the receiving antenna. Increase the separation between the equipment and receiver. Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. Consult the dealer or an experienced radio/TV technician for help. FCC Caution: To assure continued compliance, any changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate this equipment. (Example - use only shielded interface cables when connecting to computer or peripheral devices). End Product Labeling This transmitter module is authorized only for use in devices where the antenna may be installed such that 20 cm may be maintained between the antenna and users. The final end product must be labeled in visible area with the following: Contains FCC ID: _OA3-RA41N_ End Product Manual Information The user manual for end users must include the following information in a prominent location IMPORTANT NOTE: To comply with FCC RF exposure compliance requirements, the antenna used for this transmitter must be installed to provide a separation distance of at least 20cm from all persons and must not be colocated or operating in conjunction with any other antenna or transmitter. This device complies with part 15 of the FCC rules. Operation is subject to the following two conditions (1) This device may not cause harmful interference and (2) This device must accept any interference received, including interference that may cause undesired operation. www.rovingnetworks.com Version 3.3r 10/3/2012 13 RN-41-DS IMPORTANT NOTE: In the event that these conditions can not be met (for example certain laptop configurations or colocation with another transmitter), then the FCC authorization is no longer considered valid and the FCC ID can not be used on the final product. In these circumstances, the OEM integrator will be responsible for reevaluating the end product
(including the transmitter) and obtaining a separate FCC authorization. This device is intended only for OEM integrators under the following conditions: The antenna must be installed such that 20 cm is maintained between the antenna and users. As long as a condition above is met, further transmitter test will not be required. However, the OEM integrator is still responsible for testing their end product for any additional compliance requirements required with this module installed (for example, digital device emissions, PC peripheral requirements, etc.). This device complies with Part 15 of the FCC Rules and Canada licence-exempt RSS-210 standard. Operation is subject to the following two conditions:
OPERATIONS IS SUBJECT TO THE FOLLOWING TWO CONDITIONS:
(1) THIS DEVICE MAY NOT CAUSE HARMFUL INTERFERENCE
(2) THIS DEVICE MUST ACCEPT ANY INTERFERENCE RECEIVED, INCLUDING INTERFEERENCE THAT MAY UNDESIRED OPERATION. www.rovingnetworks.com Version 3.3r 10/3/2012 14 RN-41-DS Copyright 2012 Roving Networks. All rights reserved. Roving Networks is a registered trademark of Roving Networks. Apple Inc., iPhone, iPad, iTunes, Made for iPhone are registered trademarks of Apple Computer. Roving Networks reserves the right to make corrections, modifications, and other changes to its products, documentation and services at any time. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. Roving Networks assumes no liability for applications assistance or customers product design. Customers are responsible for their products and applications which use Roving Networks components. To minimize customer product risks, customers should provide adequate design and operating safeguards. Roving Networks products are not authorized for use in safety-critical applications (such as life support) where a failure of the Roving Networks product would reasonably be expected to cause severe personal injury or death, unless officers of the parties have executed an agreement specifically governing such use. Roving Networks, Inc. 102 Cooper Court Los Gatos, CA 95032
+1 (408) 395-5300 www.rovingnetworks.com www.rovingnetworks.com Version 3.3r 10/3/2012 15