RN21-I/RM

RN-21 www.rovingnetworks.com DS-RN21-V2 3/25/2010 Class 1 Bluetooth® Module Features Applications • • Supports Bluetooth 2.1/2.0/1.2/1.1 standards • • Bluetooth v2.0+EDR support Class1, up to 15dBm(RN21) (100meters) Postage stamp sized module, 15.4mm x 22mm x 1.85mm • UART (SPP or HCI) and USB (HCI only) data connection interfaces • Sustained SPP data rates - 240Kbps (slave), 300Kbps (master) • HCI data rates - 1.5Mbps sustained, 3.0Mbps burst in HCI mode • • 8MB on board flash • Embedded Bluetooth stack profiles (requires no host stack): include GAP, SDP, RFCOMM and L2CAP protocols, with SPP and DUN profile support. • Secure and robust link, FHSS, 128 bit encryption, error correction and guaranteed packet delivery. • Built in software stack for auto-discovery, auto-connect, and instant cable modes. HCI mode, or SPP/DUN software stacks • • Cable replacement • • Measurement and monitoring systems • • Medical devices Barcode scanners Industrial sensors and controls Asset tacking Description The RN21 Bluetooth module is perfect for embedded applications where the Bluetooth radio must be located within a chassis. The small form factor and external antenna allow the RN21 to fit into many diverse applications. The straightforward hardware interface, castellated pads and complete software stack provides makes it easy and reliable to design into your end product. The RN21 provides a low power, high performance Bluetooth module that supports multiple protocols, including Enhanced Data Rate (EDR). The RN21 is the solution for developers needing to add wireless capability to their product but can not afford to spend significant time and money developing Bluetooth specific hardware and software. Block Diagram Crystal VCC GND RF Switch CSR BlueCore-04 External PA BALUN PIO4 PIO5 PIO6 USB UART PCM Flash Memory 809 University Avenue • Los Gatos, CA 95032 • Tel (408) 395-6539 • info@RovingNetworks.com DS-RN21-V2 3/25/2010 Overview • • • • • • • • • Baud rate speeds: 1200bps up to 921Kbps, non-standard baud rates can be programmed. Class 1 radio, 330’ (100m) distance, 12dBm output transmitter, -80dBm typical receive sensitivity Frequency 2402 ~ 2480MHz, FHSS/GFSK modulation, 79 channels at 1MHz intervals Secure communications, 128 bit encryption Error correction for guaranteed packet delivery UART local and over-the-air RF configuration Auto-discovery/pairing requires no software configuration (instant cable replacement). Auto-connect master, IO pin (DTR) and character based trigger modes Environmental Conditions Parameter Temperature Range (Operating) Temperature Range (Storage) Relative Humidity (Operating) Relative Humidity (Storage) Value o o -40 C ~ 85 C o o -40 C ~ 85 C ≤90% ≤90% 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) Min 3.0 Typ. 3.3 35 65 Max. 3.6 60 100 Unit V mA mA 25 30 8 2.5 250uA mA mA mA mA Radio Characteristics Parameter Sensitivity @ 0.1%BER RF Transmit Power Initial Carrier Frequency Tolerance Freq. (GHz) 2.402 2.441 2.480 2.402 2.441 2.480 2.402 2.441 2.480 20dB bandwidth for modulated carrier Drift (Five slots packet) Drift Rate ∆f1avg Max Modulation ∆f2avg Min Modulation 2.402 2.441 2.480 2.402 2.441 2.480 Min Typ Max Bluetooth Specification 15.0 15.0 15.0 - -80 -80 -80 16.0 16.0 16.0 5 5 5 -86 -86 -86 ≤ -70 75 75 75 75 - 900 1000 ≤ 1000 kHz 140 140 140 140 140 140 15 13 165 165 165 190 190 190 175 175 175 - 40 20 kHz kHz kHz kHz kHz kHz kHz kHz ≤ 15 >140 115 Units dBm dBm dBm dBm dBm dBm kHz kHz kHz 809 University Avenue • Los Gatos, CA 95032 • Tel (408) 395-6539 • info@RovingNetworks.com DS-RN21-V2 3/25/2010 Pin Description Antenna 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 RN21 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 38 3 7 3 6 35 Pin Name 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 GND NC GND AD0 AD1 Reset SPI_MISO SPI_CSB SPI_CLK SPI_MOSI UART_CTS UART_TX UART_RTS UART_RX NC VCC_3.3V GND PCM_OUT PCM_SYNC PCM_IN PCM_CLK USB+ USBPIO7 PIO6 PIO5 PIO4 PIO3 29 30 31 32 33 34 35 36 37 38 PIO2 NC NC GND RF_OUT GND PIO8 PIO9 PIO10 PIO11 Description Default RF pad keep all traces and planes clear. Optional Analog input channel Optional Analog input channel Input to RN21 Programming only Programming only Programming only Programming only UART input, if set HIGH, disables transmitter UART Transmit output UART output, goes HIGH to disable host transmitter UART Receive Input Not used Not used Active HIGH No Connect No Connect No Connect No Connect Low level input to RN21 High level output from RN21 Low level output from RN21 Input to RN21 with pullup Input PCM interface PCM interface PCM interface PCM interface USB port USB port IO (HIGH= force 9600 baud), low = 115K baud IO (HIGH=AUTO MASTER) Status: toggles based on state, LOW on connect To set Factory defaults start HIGH, then toggle 3x Auto discovery = HIGH IO (remote DTR signal) NOTE on 4.24 firmware PIO2 and PIO10 are switched Antenna ground To external antenna Antenna ground IO (RF data/config LED option) IO High when connected, Low otherwise IO ( remote RTS signal ) No Connect No Connect No Connect No Connect Pull up 1.5K when active Input to RN21 with weak pulldown Input to RN21with weak pulldown Output from RN21 Input to RN21 with weak pulldown Input to RN21 with weak pulldown Output from RN21 Output from RN21 Output from RN21 Input to RN21 with weak pulldown Input to RN21 with weak pulldown Input to RN21 with weak pulldown 809 University Avenue • Los Gatos, CA 95032 • Tel (408) 395-6539 • info@RovingNetworks.com DS-RN21-V2 3/25/2010 Digital I/O Characteristics 2.7V ≤ VDD ≤ 3.0V Input logic level LOW Input logic level HIGH Output logc level LOW Output logic level HIGH All I/O’s default to weakpull down Min -0.4 0.7VDD VDD-0.2 +0.2 Typ. +1.0 Max. +0.8 VDD+0.4 0.2 +5.0 Unit V V V V uA Typical Application Circuit 809 University Avenue • Los Gatos, CA 95032 • Tel (408) 395-6539 • info@RovingNetworks.com DS-RN21-V2 3/25/2010 Module Dimensions PCB LAYOUT MODULE DIMENSIONS 15.4 mm 15.0 mm 0.94 mm (pad) 0.75 mm 1.27 mm RN21 22.0 mm RN21 0.8 mm (pad) 21.82 mm 0.75 mm 1.85 mm 9.87 mm 1.32 mm 0.68 mm (pad) 1.27 mm 22.0 mm Design Concerns 1. Reset circuit. RN-21 contains a 1k pull-down to GND, the polarity of reset is active HIGH. A power on reset circuit with delay is OPTIONAL on the reset pin of the module. It 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 IO is available to generate reset once power is stable. If not, there are many low cost power supervisor chips available, such as MCP8010. 2. Factory reset PIO4. It is a good idea to connect this pin to a switch, or jumper, or resistor, so it can be accessed. This pin can be used to reset the module to FACTORY DEFAULTS and is often critical in situations where the module has been misconfigured. 3. Connection status. PIO5 is available to drive an LED, and blinks at various speeds to indicate status. PIO2 is an output which directly reflects the connection state, it goes HIGH when connected, and LOW otherwise. 4. HCI mode. The RN21 module must be loaded with special firmware to run in HCI mode. When in HCI mode the standard SPP/DUN profiles are disabled. 809 University Avenue • Los Gatos, CA 95032 • Tel (408) 395-6539 • info@RovingNetworks.com DS-RN21-V2 3/25/2010 5. Using SPI bus for flash upgrade. While not required, this bus is very useful for configuring advanced parameters of the Bluetooth modules, and is required for upgrading the firmware on modules. The suggested ref-design shows a 6pin header which can be implemented to gain access to this bus. A minimum-mode version could just use the SPI signals (4pins) and pickup ground and VCC from elsewhere on the design. 6. Antenna Design. The pattern from the rf_out terminal pad should be designed with 50ohms impedance and traced with straight lines. (see diagram to the right) The rf_out signal line should not run under of near the RN21 module. The GND plane should be on the side of the PCB which the module is mounted. The GND should be reinforced with through-hole connections and other means to stabilize the electric potential. Recommended on-chip antenna is Yageo SMT high performance chip for Bluetooth/802.11b/g 2.45GHz (3.6mm x 7.2mm) GND RF_OUT GND RN21 Module 7. Soldering Reflow Profile. • Lead-Free Solder Reflow • Temp: 230 degree C, 30-40 seconds, Peak 250 degree C maximum. • Preheat temp: 165 +- 15 degree C, 90 to 120 seconds. • Time: Single Pass, One Time Ordering Information Part Number RN-21 RN-21-H RN-21-U Description Standard firmware (SPP/DUN Master and Slave) HCI firmware (HCI over H4 UART) USB firmware (HCI over USB port, slave device at 12Mbps rate) For other configurations, contact Roving Networks directly. Visit http://www.rovingnetworks.com for current pricing and a list of locations selling Roving Networks Products. Copyright © 2009 Roving Networks. All rights reserved. The Bluetooth trademark and logo are registered trademarks of Bluetooth SIG, Inc. All other trademarks are property of their respective owners. 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 customer’s 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. 809 University Avenue • Los Gatos, CA 95032 • Tel (408) 395-6539 • info@RovingNetworks.com