RN2903A-I/RM103

## **RN2903** 

## **Low-Power Long Range LoRa[®] Technology Transceiver Module** 

## **Features** 

- On-Board LoRaWAN™ Protocol Stack 

- ASCII Command Interface over UART 

- Compact Form Factor: 17.8 x 26.7 x 3.34 mm 

- Castellated SMT Pads for Easy and Reliable PCB Mounting 

- Environmentally Friendly, RoHS Compliant 

- Compliance: 

- Modular Certified for the United States (FCC) and Canada (IC) 

- Taiwan 

- Device Firmware Upgrade (DFU) over UART, see _“RN2903 LoRa[®] Technology Module Command Reference User’s Guide”_ (DS40001811) 

## **Operational** 

- Single Operating Voltage: 2.1V to 3.6V (3.3V typical) 

- Temperature Range: -40°C to +85°C 

- Low-Power Consumption 

- Programmable RF Communication Bit Rate up to 300 kbps with FSK Modulation, 12500 bps with LoRa[® ] Technology Modulation 

- Integrated MCU, Crystal, EUI-64 Node Identity Serial EEPROM, Radio Transceiver with Analog Front End, Matching Circuitry 

- 14 GPIOs for Control and Status, Shared with 13 Analog Inputs 

## **RF/Analog Features** 

- Low-Power Long Range Transceiver Operating in the 915 MHz Frequency Band 

- High Receiver Sensitivity: Down to -146 dBm 

- TX Power: Adjustable up to +18.5 dBm High Efficiency PA 

## **General Description** 

Microchip’s RN2903 Low-Power Long Range LoRa Technology Transceiver module provides an easy to use, low-power solution for long range wireless data transmission. The advanced command interface offers rapid time to market. 

The RN2903 module complies with the LoRaWAN Class A protocol specifications. It integrates RF, a baseband controller, command Application Programming Interface (API) processor, making it a complete long range solution. 

The RN2903 module is suitable for simple long range sensor applications with external host MCU. 

## **Applications** 

   - Automated Meter Reading 

   - Home and Building Automation 

   - Wireless Alarm and Security Systems 

   - Industrial Monitoring and Control 

   - Machine to Machine (M2M) 

   - Internet of Things (IoT) 

- FSK, GFSK, and LoRa Technology Modulation 

- IIP3 = -11 dBm 

- Up to 15 km Coverage at Suburban and up to 5 km Coverage at Urban Area 

DS50002390E-page 1 

 2015-2018 Microchip Technology Inc. 

**RN2903** 

## **Table of Contents** 

|1.0|Device Overview .......................................................................................................................................................................... 3|
|---|---|
|2.0|General Specifications ................................................................................................................................................................. 6|
|3.0|Typical Hardware Connections..................................................................................................................................................... 8|
|4.0|Physical Dimensions .................................................................................................................................................................. 10|
|5.0|Application Information................................................................................................................................................................11|
|6.0|Regulatory Approval ................................................................................................................................................................... 14|
|Appendix A: Revision History............................................................................................................................................................... 19||
|The|Microchip Web Site ....................................................................................................................................................................... 21|
|Customer Change Notification Service ................................................................................................................................................ 21||
|Customer Support................................................................................................................................................................................ 21||
|Product Identification System............................................................................................................................................................... 23||



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## **Most Current Data Sheet** 

To obtain the most up-to-date version of this data sheet, please register at our Worldwide Web site at: 

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You can determine the version of a data sheet by examining its literature number found on the bottom outside corner of any page. The last character of the literature number is the version number, (e.g., DS30000000A is version A of document DS30000000). 

## **Errata** 

An errata sheet, describing minor operational differences from the data sheet and recommended workarounds, may exist for current devices. As device/documentation issues become known to us, we will publish an errata sheet. The errata will specify the revision of silicon and revision of document to which it applies. 

To determine if an errata sheet exists for a particular device, please check with one of the following: 

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When contacting a sales office, please specify which device, revision of silicon and data sheet (include literature number) you are using. 

## **Customer Notification System** 

Register on our web site at **www.microchip.com** to receive the most current information on all of our products. 

DS50002390E-page 2 

 2015-2018 Microchip Technology Inc. 

**RN2903** 

## **1.0 DEVICE OVERVIEW** 

The RN2903 transceiver module features LoRa Technology RF modulation, which provides long range spread spectrum communication with high interference immunity. 

Using LoRa Technology modulation technique, RN2903 can achieve a receiver sensitivity of -146 dBm. The high sensitivity combined with the integrated +18.5 dBm output power amplifier yields industry leading link budget, which makes it optimal for applications requiring extended range and robustness. 

LoRa Technology modulation also provides significant advantages in both blocking and selectivity compared to the conventional modulation techniques, solving the traditional design compromise between extended range, interference immunity, and low-power consumption. 

The RN2903 module delivers exceptional phase noise, selectivity, receiver linearity, and IIP3 for significantly lower power consumption. The level of conductive harmonics is below -70 dBm. Figure 1-1, Figure 1-2 and Figure 1-3 show the top view, the pinout, and the block diagram of the module. 

**FIGURE 1-1: RN2903 TOP VIEW** 

**FIGURE 1-2: RN2903 PIN DIAGRAM** 

**==> picture [469 x 205] intentionally omitted <==**

**----- Start of picture text -----**<br>
J i} J j ) i} i} i} ) ) ) ) } ) i} J ) )<br>28 GND GND 20<br>29 NC NC 19<br>30 PGC_INT NC 18<br>31 PGD_INT NC 17<br>32 RESET NC 16<br>33 GND NC 15<br>34 VDD GPIO10 14<br>MICROCHIP 35 GPIO0 GPIO11 13<br>36 GPIO1 VDD 12<br>NRNZIUS - 37 GPIO2 GND 11<br>38 GPIO3 GPIO12 10<br>39 GPIO4 GPIO13 9<br>TT 5 . ) T Y ) 1 a 2a ore bi) 40 GPIO5 GND 8<br>41 GND UART_RX 7<br>42 NC UART_TX 6<br>43 GPIO6 RESERVED 5<br>44 GPIO7 RESERVED 4<br>45 GPIO8 UART_CTS 3<br>46 GPIO9 UART_RTS 2<br>47 GND GND 1<br>27 26 25 24 23 22 21<br>GND GND NC GND RF GND GND<br>**----- End of picture text -----**<br>


**FIGURE 1-3: RN2903 BLOCK DIAGRAM** 

**==> picture [272 x 228] intentionally omitted <==**

**----- Start of picture text -----**<br>
Host MCU<br>RN2903 Module<br>MCU<br>UART<br>Command Processor<br>LoRaWAN™ Protocol Stack<br>14 GPIO Pins<br>Real-Time<br>I [2] C SPI<br>Clock<br>EUI-64 32768 Hz LoRa [®] Technology<br>EEPROM Crystal Radio<br>User Hardware:  Antenna<br>915 MHz<br>**----- End of picture text -----**<br>


DS50002390E-page 3 

 2015-2018 Microchip Technology Inc. 

## **RN2903** 

Table 1-1 describes the RN2903 pins. 

**TABLE 1-1: PIN DESCRIPTION** 

|**Pin**|**Name**|**Type**|**Description**|
|---|---|---|---|
|1|GND|Power|Ground supplyterminal|
|2|UART_RTS|Output|Communication UART RTS signal(**1**), or GPIO|
|3|UART_CTS|Input|Communication UART CTS signal(**1**), or GPIO|
|4|RESERVED|—|Do not connect|
|5|RESERVED|—|Do not connect|
|6|UART_TX|Output|Communication UART Transmit(TX)|
|7|UART_RX|Input|Communication UART Receive(RX)|
|8|GND|Power|Ground supplyterminal|
|9|GPIO13|Input/Output|Generalpurpose I/Opin or analoginput|
|10|GPIO12|Input/Output|Generalpurpose I/Opin or analoginput|
|11|GND|Power|Ground supplyterminal|
|12|VDD|Power|Positive supplyterminal|
|13|GPIO11|Input/Output|Generalpurpose I/Opin or analoginput|
|14|GPIO10|Input/Output|Generalpurpose I/Opin or analoginput|
|15|NC|—|Not connected|
|16|NC|—|Not connected|
|17|NC|—|Not connected|
|18|NC|—|Not connected|
|19|NC|—|Not connected|
|20|GND|Power|Ground supplyterminal|
|21|GND|Power|Ground supplyterminal|
|22|GND|Power|Ground supplyterminal|
|23|RF|RF analog|RF signalpin|
|24|GND|Power|Ground supplyterminal|
|25|NC|—|Not connected|
|26|GND|Power|Ground supplyterminal|
|27|GND|Power|Ground supplyterminal|
|28|GND|Power|Ground supplyterminal|
|29|NC|—|Not connected|
|30|PGC_INT|Input/Ouput|Internal MCU ICSPprogram clock orgeneralpurpose I/Opin|
|31|PGD_INT|Input/Ouput|Internal MCU ICSPprogram data orgeneralpurpose I/Opin|
|32|RESET|Input|Active-low device Reset input|
|33|GND|Power|Ground supplyterminal|
|34|VDD|Power|Positive supplyterminal|
|35|GPIO0|Input/Output|Generalpurpose I/Opin or analoginput|
|36|GPIO1|Input/Output|Generalpurpose I/Opin or analoginput|
|37|GPIO2|Input/Output|Generalpurpose I/Opin or analoginput|
|38|GPIO3|Input/Output|Generalpurpose I/Opin or analoginput|
|39|GPIO4|Input/Output|Generalpurpose I/Opin|
|40|GPIO5|Input/Output|Generalpurpose I/Opin or analoginput|
|41|GND|Power|Ground supplyterminal|
|42|NC|—|Not connected|
|43|GPIO6|Input/Output|Generalpurpose I/Opin or analoginput|



DS50002390E-page 4 

 2015-2018 Microchip Technology Inc. 

**RN2903** 

## **TABLE 1-1: PIN DESCRIPTION (CONTINUED)** 

|**Pin**|**Name**|**Type**|**Description**|
|---|---|---|---|
|44|GPIO7|Input/Output|Generalpurpose I/Opin or analoginput|
|45|GPIO8|Input/Output|Generalpurpose I/Opin or analoginput|
|46|GPIO9|Input/Output|Generalpurpose I/Opin or analoginput|
|47|GND|Power|Ground supplyterminal|



**Note 1:** Optional handshake lines are supported in future firmware releases. 

DS50002390E-page 5 

 2015-2018 Microchip Technology Inc. 

**RN2903** 

## **2.0 GENERAL SPECIFICATIONS** 

Table 2-1 provides the general specifications for the module. Table 2-2, Table 2-3, and Table 2-4 provide the electrical characteristics, current consumption, and 

dimensions of the module, respectively. Table 2-5 shows the RF output power calibration data. Table 2-6 shows the RF output power at different supply voltages and temperatures. 

## **TABLE 2-1: GENERAL SPECIFICATIONS** 

|**Specification**|**Description**|
|---|---|
|FrequencyBand|902.000 MHz to 928.000 MHz|
|Modulation Method|FSK, GFSK, and LoRa®Technologymodulation|
|Maximum Over-the-Air Data Rate|300 kbps with FSK modulation; 12500 bps with LoRa Technologymodulation|
|RF Connection|Board edge connection|
|Interface|UART|
|Operation Range|Upto 15 km coverage at suburban; upto 5 km coverage at urban area|
|Sensitivityat 1% PER|-146 dBm**(1)**|
|RF TX Power|Adjustable upto max. +18.5 dBm on 915 MHz band(**2**)|
|Generated Conductive<br>Harmonics Level|Below -70 dBm|
|Temperature(operating)|-40°C to +85°C|
|Temperature(storage)|-40°C to +115°C|
|Humidity|10% ~ 90% non-condensing|



**Note 1:** Dependent on modulation settings, Receiver Bandwidth (RBW), and Spreading Factor (SF). 

- **2:** TX power is adjustable. For more information, refer to the _“RN2903 LoRa[® ] Technology Module Command Reference User’s Guide”_ (DS40001811). 

## **TABLE 2-2: ELECTRICAL CHARACTERISTICS** 

|**Parameter**|**Parameter**||**Min.**|**Typ.**|**Max.**|**Units**|
|---|---|---|---|---|---|---|
|SupplyVoltage|||2.1|—|3.6|V|
|Voltage on|any pin with respect to VSS(except VDD and|RESET<br>)|-0.3|—|VDD + 0.3|V|
|Voltage on|VDD with respect to VSS||-0.3|—|3.9|V|
|Voltage on|RESET<br>with respect to VSS||0|—|+11|V|
|Input ClampCurrent(IIK) (VI < 0 or VI > VDD)|||—|—|+/-20|mA|
|Output ClampCurrent(IOK) (VO < 0 or VO > VDD)|||—|—|+/-20|mA|
|GPIO sink/source current each|||—|—|25/25|mA|
|Total GPIO sink/source current|||—|—|200/185|mA|
|RAM Data Retention Voltage(in Sleepmode or Reset state)|||1.5|—|—|V|
|VDD Start Voltage to ensure internal Power-on Reset signal|||—|—|0.7|V|
|VDD Rise Rate to ensure internal Power-on Reset signal|||0.05|—|—|V/ms|
|Brown-out Reset Voltage|||1.75|1.9|2.05|V|
|Logic Input Low Voltage|||—|—|0.15 x VDD|V|
|Logic Input High Voltage|||0.8 x VDD|—|—|V|
|Input Leakage at <25°C<br>(VSS<VPIN<VDD, Pin at high-impedance)|||—|0.1|50|nA|
|Input Leakage at +60°C<br>(VSS<VPIN<VDD, Pin at high-impedance)|||—|0.7|100|nA|
|Input Leakage at +85°C<br>(VSS<VPIN<VDD, Pin at high-impedance)|||—|4|200|nA|
|RF Input Level|||—|—|+10|dBm|



DS50002390E-page 6 

 2015-2018 Microchip Technology Inc. 

**RN2903** 

## **TABLE 2-3: CURRENT CONSUMPTION** 

|**Mode**|**Temperature**<br>**(°C)**|**Typical Current (mA)**|**Typical Current (mA)**|**Typical Current (mA)**|
|---|---|---|---|---|
|||**VDD = 2.1V**|**VDD = 3.3V**|**VDD = 3.6V**|
|Idle|-40 to +85|1.8|2.8|3.1|
|Transmit|-40 to +85|105|121|122|
|Deep Sleep|-40|0.0009|0.0010|0.0012|
||25|0.0011|0.0013|0.0014|
||85|0.0026|0.0032|0.0036|



## **TABLE 2-4: MODULE DIMENSIONS** 

**Parameter Value** 

|**Parameter**|**Value**|
|---|---|
|Dimensions|17.8 x 26.7 x 3.34 mm|
|Weight|2.05g|



## **TABLE 2-5: OUTPUT POWER OF TX POWER SETTING** 

|**TX Power Setting**|**Output Power (dBm)**|**Typical Supply Current at 3.3V (mA)**|
|---|---|---|
|2|3.0|42.6|
|3|4.0|44.8|
|4|5.0|47.3|
|5|6.0|49.6|
|6|7.0|52.0|
|7|8.0|55.0|
|8|9.0|57.7|
|9|10.0|61.0|
|10|11.0|64.8|
|11|12.0|73.1|
|12|13.0|78.0|
|14|14.7|83.0|
|15|15.5|88.0|
|16|16.3|95.8|
|17|17.0|103.6|
|20|18.5|124.4|



## **TABLE 2-6: OUTPUT POWER OF SUPPLY VOLTAGE AND TEMPERATURE** 

|**Temperature**<br>**(°C)**|**Typical Output Power (dBm)**|**Typical Output Power (dBm)**|**Typical Output Power (dBm)**|
|---|---|---|---|
||**VDD = 2.1V**|**VDD = 3.3V**|**VDD = 3.6V**|
|-40|18.0|18.6|18.7|
|25|17.1|18.0|18.1|
|85|16.3|17.3|17.3|



DS50002390E-page 7 

 2015-2018 Microchip Technology Inc. 

**RN2903** 

## **3.0 TYPICAL HARDWARE CONNECTIONS** 

Figure 3-1 shows the typical hardware connections. 

## **FIGURE 3-1: HARDWARE CONNECTIONS** 

**==> picture [468 x 379] intentionally omitted <==**

**----- Start of picture text -----**<br>
VCC VCC 915 MHz Antenna<br>ICSP<br>1 10k<br>2<br>3<br>Logic input 4<br>VCC 5<br>3 6<br>2<br>1<br>GND<br>GND GND 28 GND GND [20] GND<br>Indicator LEDs 2930 NCPGC_INT NCNC [19][18]<br>VCC 31 PGD_INT NC [17]<br>32 RESET NC [16]<br>220R VCC 33 GND NC [15]<br>34 VDD GPIO10 [14]<br>220R 35 GPIO0 GPIO11 [13] VCC<br>36 GPIO1 RN2903 VDD [12]<br>GND 37 GPIO2 GND [11]<br>38 GPIO3 GPIO12 [10] VCC<br>Transistor output 39 GPIO4 GPIO13 [9]<br>3 GPIOs 4041 GPIO5 GND UART_RXGND [8][7]<br>42 NC UART_TX [6] MCU<br>1 43 GPIO6 RESERVED [5]<br>2 220R 44 GPIO7 RESERVED [4]<br>45 GPIO8 UART_CTS [3]<br>46 GPIO9 UART_RTS [2]<br>GND 47 GND GND [1]<br>VCC<br>GND GND GND<br>Analog 0-VCC<br>Sensor<br>GND<br>27 26 25 24 23 22 21<br>GND GND NC GND RF GND GND<br>**----- End of picture text -----**<br>


## **3.1 Interface to Host MCU** 

The RN2903 module has a dedicated UART interface to communicate with a host controller. Optional handshake lines are supported in future firmware releases. The _“RN2903 LoRa[®] Technology Module Command Reference User’s Guide”_ (DS40001811) provides a detailed UART command description. Table 3-1 shows the default settings for the UART communication. 

## **TABLE 3-1: DEFAULT UART SETTINGS** 

|**Specification**|**Description**|
|---|---|
|Baud Rate<br>5|7600 bps|
|Packet Length<br>8|bit|
|ParityBit<br>N|o|
|StopBits<br>1|bit|
|Hardware Flow Control<br>N|o|



## **3.2 GPIO Pins (GPIO0–GPIO13)** 

The module has 14 GPIO pins. These lines can be connected to switches, LEDs, and relay outputs. The pins can be either logic inputs or outputs, and some pins (see Table 1-1) have analog input capability that can be accessed via the module firmware. These pins have limited sink and source capabilities. Electrical characteristics are described in Table 2-2. For more information, see _“RN2903 LoRa[®] Technology Module Command Reference User’s Guide”_ (DS40001811). 

## **3.3 RF Connection** 

When routing RF path, use proper strip lines with an impedance of 50 Ohm. 

DS50002390E-page 8 

 2015-2018 Microchip Technology Inc. 

**RN2903** 

## **3.4 RESET Pin** 

The RESET pin of the module is an active-low logic input. An internal weak pull-up resistor is enabled when the pin is configured as the MCLR input. 

## **3.5 Power Pins** 

It is recommended to connect power pins (Pin 12 and Pin 34) to a stable supply voltage with sufficient source current. Table 2-3 shows the current consumption. 

Additional filtering capacitors are not required but used to ensure stable supply voltage in a noisy environment. 

## **3.6 Internal Program Pins** 

PGC_INT (Pin 30) and PGD_INT (Pin 31) are internal program pins used during manufacturing. For normal operation, these pins can be left unconnected. 

The normal firmware upgrade method is through the internal bootloader of the module via the UART. The method is documented in the _“RN2903 LoRa[®] Technology Module Command Reference User’s Guide”_ (DS40001811) _._ 

However, for backup firmware update purposes the user can place a 6-pin ICSP header on their host PCB with PGC_INT (Pin 30), PGD_INT (Pin 31), RESET (Pin 32), power and ground. 

During High Voltage In-Circuit Serial Programming mode, the RESET pin is driven with high-voltage (9V), therefore protection may be necessary for sensitive devices. 

**Note:** Only official Microchip Technology firmware released for the RN2903 module shall be used to maintain FCC and IC certification. 

DS50002390E-page 9 

 2015-2018 Microchip Technology Inc. 

**RN2903** 

## **4.0 PHYSICAL DIMENSIONS** 

Figure 4-1 and Figure 4-2 illustrate the physical dimensions and the recommended PCB layout for the RN2903 module. 

## **FIGURE 4-1: RN2903 PHYSICAL DIMENSIONS** 

## **FIGURE 4-2:** 

## **RECOMMENDED PCB FOOTPRINT** 

**Note:** Host PCB top layer copper traces must have solder mask to avoid shorting test pins on the bottom of the module. 

DS50002390E-page 10 

 2015-2018 Microchip Technology Inc. 

**RN2903** 

## **5.0 APPLICATION INFORMATION** 

## **5.1 RF Trace Layout Design** 

The RN2903 modular transmitter is certified with a PCB edge SMA connector and micro-strip trace layout as shown in Figure 5-1 and Figure 5-2. The left side RF 

path is not used for this module. The host PCB can follow these trace design to maintain compliance under the modular grant (FCC) and certificate (IC). Gerber files are available on the RN2903 product web page at www.microchip.com/rn2903. 

## **FIGURE 5-1: RF TRACE ROUTING (TOP LAYER)** 

**==> picture [386 x 50] intentionally omitted <==**

**----- Start of picture text -----**<br>
PCB Details:  Trace Dimensions:<br>   Two layer, plated through hole         Trace width: 0.75<br>   FR4     Trace gap: 0.15<br>   Thickness: 1.55 mm     Finished Copper Weight: 1 ounce<br>   Via stitching with 0.25 mm plated<br>**----- End of picture text -----**<br>


Dimensions are in millimeters 

**FIGURE 5-2: RF TRACE ROUTING (BOTTOM LAYER)** 

DS50002390E-page 11 

 2015-2018 Microchip Technology Inc. 

## **RN2903** 

## **5.2 PCB Trace Antenna** 

Modular certification of the RN2903 module is performed with the PCB trace antenna as shown in Figure 5-3. The exact dimensions of the trace antenna must be followed. The PCB trace antenna is fabricated on the top copper layer and covered in solder mask. The layers below the antenna do not have copper trace. The PCB material is FR4 and the thickness is 0.062 inches (1.6 mm). The antenna has 50 ohm impedance and no matching is required. The supporting board must be 84 mm long and 53 mm wide in order to generate that impedance and the average gain of 1.3 dB. Gerber files for the PCB trace antenna are available on the RN2903 product web page on the Microchip web site at http://www.microchip.com/ rn2903. 

Figure 5-5 illustrates the three-dimensional (3D) radiation pattern. The radiation pattern shows the relative position of the 3D radiation “donut” with reference to the module orientation. This is a very useful guide for placement of the module to obtain the maximum range. 

## **FIGURE 5-3: PCB TRACE ANTENNA MEASUREMENTS** 

The antenna patterns plotted in Figure 5-4 through Figure 5-5 are the simulated results of the PCB antenna. 

Figure 5-4 illustrates the two-dimensional (2D) radiation pattern. The calculated average gain is 1.3 dBi. The radiation pattern for the XZ plane is shown in red, whereas the YZ plane is shown in blue. The most powerful radiation occurs in the YZ plane as represented by the blue pattern. 

## **FIGURE 5-4: SIMULATED TWO-DIMENSIONAL RADIATION PATTERN** 

**==> picture [78 x 7] intentionally omitted <==**

**----- Start of picture text -----**<br>
Radiation Pattern 1<br>**----- End of picture text -----**<br>


|**Name**|**Theta [deg] **|**Angle [deg]**|**Mag. [dB]**|
|---|---|---|---|
|m1|330|-30|1.1|
|m2|140|140|1.7|
|m3|180|180|1.5|



## 915 MHz F Ant for Module dimensions 

|**Curve Information**<br>**Avg.**|**Curve Information**<br>**Avg.**|
|---|---|
|dB (Gain Total)<br>Setup 1: Last Adaptive<br>Freq. = 915<br>MHz Phi = ‘0 deg’|-2.3|
|dB (Gain Total)<br>Setup 1: Last Adaptive<br>Freq. = 915<br>MHz Phi = ‘90 deg’|1.3|



DS50002390E-page 12 

 2015-2018 Microchip Technology Inc. 

**RN2903** 

**FIGURE 5-5:** 

**==> picture [274 x 8] intentionally omitted <==**

**----- Start of picture text -----**<br>
SIMULATED THREE-DIMENSIONAL RADIATION PATTERN<br>**----- End of picture text -----**<br>


## **5.3 Approved Antennas** 

Modular certification of the RN2903 module is performed with the external antenna type in Table 5-1. For specific regulatory requirements by country, refer to **Section 6.0 "Regulatory Approval"** . 

**TABLE 5-1: TESTED EXTERNAL ANTENNA TYPES** 

|**Type**|**Gain (dBi)**|
|---|---|
|Sleeve Dipole|6|
|PCB Trace|1.7|



DS50002390E-page 13 

 2015-2018 Microchip Technology Inc. 

**RN2903** 

## **6.0 REGULATORY APPROVAL** 

This section outlines the regulatory information for the RN2903 module for the following countries: 

- United States 

- Canada 

- Taiwan 

## **6.1 United States** 

The RN2903 module has received Federal Communications Commission (FCC) CFR47 Telecommunications, Part 15 Subpart C “Intentional Radiators” modular approval in accordance with Part 15.212 Modular Transmitter approval. Modular approval allows the end user to integrate the RN2903 module into a finished product without obtaining subsequent and separate FCC approvals for intentional radiation, provided no changes or modifications are made to the module circuitry. Changes or modifications could void the user's authority to operate the equipment. The end user must comply with all of the instructions provided by the Grantee, which indicate installation and/or operating conditions necessary for compliance. 

The finished product is required to comply with all applicable FCC equipment authorizations regulations, requirements and equipment functions not associated with the transmitter module portion. For example, compliance must be demonstrated to regulations for other transmitter components within the host product; to requirements for unintentional radiators (Part 15 Subpart B “Unintentional Radiators”), such as digital devices, computer peripherals, radio receivers, etc.; and to additional authorization requirements for the non-transmitter functions on the transmitter module (i.e., Verification, or Declaration of Conformity) (e.g., transmitter modules may also contain digital logic functions) as appropriate. 

## 6.1.1 LABELING AND USER INFORMATION REQUIREMENTS 

The RN2903 module has been labeled with its own FCC ID number, and if the FCC ID is not visible when the module is installed inside another device, then the outside of the finished product into which the module is installed must also display a label referring to the enclosed module. This exterior label can use wording as follows: 

Contains Transmitter Module FCC ID: T9JRN2903 

## _or_ 

Contains FCC ID: T9JRN2903 

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. 

A user's manual for the finished product should include the following 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. This equipment generates, uses and can radiate radio frequency energy, and if not installed and used in accordance with the instructions, may cause harmful interference 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 or more of the following measures: 

- 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. 

Additional information on labeling and user information requirements for Part 15 devices can be found in KDB Publication 784748 available at the FCC Office of Engineering and Technology (OET) Laboratory Division Knowledge Database (KDB) https://apps.fcc.gov/oetcf/kdb/index.cfm. 

DS50002390E-page 14 

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## 6.1.2 RF EXPOSURE 

All transmitters regulated by FCC must comply with RF exposure requirements. KDB 447498 General RF Exposure Guidance provides guidance in determining whether proposed or existing transmitting facilities, operations or devices comply with limits for human exposure to Radio Frequency (RF) fields adopted by the Federal Communications Commission (FCC). 

From the RN2903 FCC Grant: Output power listed is conducted. This grant is valid only when the module is sold to OEM integrators and must be installed by the OEM or OEM integrators. This transmitter is restricted for use with the specific antenna(s) tested in this application for Certification and must not be co-located or operating in conjunction with any other antenna or transmitters within a host device, except in accordance with FCC multi-transmitter product procedures. 

## 6.1.3 APPROVED EXTERNAL ANTENNA TYPES 

To maintain modular approval in the United States, only the antenna types that have been tested shall be used. It is permissible to use different antenna manufacturer provided the same antenna type and antenna gain (equal to or less than) is used. 

Testing of the RN2903 module was performed with the antenna types listed in Table 5-1 Tested External Antenna Types. 

## 6.1.4 HELPFUL WEB SITES 

Federal Communications Commission (FCC): http://www.fcc.gov 

FCC Office of Engineering and Technology (OET) Laboratory Division Knowledge Database (KDB): https://apps.fcc.gov/oetcf/kdb/index.cfm 

## **6.2 Canada** 

The RN2903 module has been certified for use in Canada under Industry Canada (IC) Radio Standards Specification (RSS) RSS-210 and RSS-Gen. Modular approval permits the installation of a module in a host device without the need to recertify the device. 

## 6.2.1 LABELING AND USER INFORMATION REQUIREMENTS 

Labeling Requirements for the Host Device (from Section 3.2.1, RSS-Gen, Issue 3, December 2010): The host device shall be properly labeled to identify the module within the host device. 

The Industry Canada certification label of a module shall be clearly visible at all times when installed in the host device, otherwise the host device must be labeled to display the Industry Canada certification number of 

the module, preceded by the words “Contains transmitter module”, or the word “Contains”, or similar wording expressing the same meaning, as follows: 

Contains transmitter module IC: 6514A-RN2903. 

User Manual Notice for License-Exempt Radio Apparatus (from Section 7.1.3 RSS-Gen, Issue 3, December 2010): User manuals for license-exempt radio apparatus shall contain the following or equivalent notice in a conspicuous location in the user manual or alternatively on the device or both: 

This device complies with Industry Canada licenseexempt RSS standard(s). Operation is subject to the following two conditions: (1) this device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired operation of the device. 

Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence. L'exploitation est autorisée aux deux conditions suivantes: (1) l'appareil ne doit pas produire de brouillage, et (2) l'utilisateur de l'appareil doit accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d'en compromettre le fonctionnement. 

Transmitter Antenna (from Section 7.1.2 RSS-Gen, Issue 3, December 2010): User manuals for transmitters shall display the following notice in a conspicuous location: 

Under Industry Canada regulations, this radio transmitter may only operate using an antenna of a type and maximum (or lesser) gain approved for the transmitter by Industry Canada. To reduce potential radio interference to other users, the antenna type and its gain should be so chosen that the equivalent isotropically radiated power (e.i.r.p.) is not more than that necessary for successful communication. 

Conformément à la réglementation d'Industrie Canada, le présent émetteur radio peut fonctionner avec une antenne d'un type et d'un gain maximal (ou inférieur) approuvé pour l'émetteur par Industrie Canada. Dans le but de réduire les risques de brouillage radioélectrique à l'intention des autres utilisateurs, il faut choisir le type d'antenne et son gain de sorte que la puissance isotrope rayonnée équivalente (p.i.r.e.) ne dépasse pas l'intensité nécessaire à l'établissement d'une communication satisfaisante. 

The above notice may be affixed to the device instead of displayed in the user manual. 

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## **RN2903** 

User manuals for transmitters equipped with detachable antennas shall also contain the following notice in a conspicuous location: 

This radio transmitter (identify the device by certification number, or model number if Category II) has been approved by Industry Canada to operate with the antenna types listed below with the maximum permissible gain and required antenna impedance for each antenna type indicated. Antenna types not included in this list, having a gain greater than the maximum gain indicated for that type, are strictly prohibited for use with this device. 

Conformément à la réglementation d'Industrie Canada, le présent émetteur radio peut fonctionner avec une antenne d'un type et d'un gain maximal (ou inférieur) approuvé pour l'émetteur par Industrie Canada. Dans le but de réduire les risques de brouillage radioélectrique à l'intention des autres utilisateurs, il faut choisir le type d'antenne et son gain de sorte que la puissance isotrope rayonnée équivalente (p.i.r.e.) ne dépasse pas l'intensité nécessaire à l'établissement d'une communication satisfaisante. 

Immediately following the above notice, the manufacturer shall provide a list of all antenna types approved for use with the transmitter, indicating the maximum permissible antenna gain (in dBi) and required impedance for each. 

## 6.2.2 RF EXPOSURE 

All transmitters regulated by IC must comply with RF exposure requirements listed in RSS-102 - Radio Frequency (RF) Exposure Compliance of Radiocommunication Apparatus (All Frequency Bands). Currently this device is approved for use for when 20 cm can be maintained between the antenna and users. 

power set at the maximum level. Any antenna of the same type having equal or lesser gain as an antenna that had been successfully tested with the transmitter, will also be considered approved with the transmitter, and may be used and marketed with the transmitter. 

When a measurement at the antenna connector is used to determine RF output power, the effective gain of the device's antenna shall be stated, based on measurement or on data from the antenna manufacturer. For transmitters of output power greater than 10 milliwatts, the total antenna gain shall be added to the measured RF output power to demonstrate compliance to the specified radiated power limits. 

Testing of the RN2903 module was performed with the antenna types listed in Table 5-1 Tested External Antenna Types. 

## 6.2.4 HELPFUL WEB SITES 

Industry Canada: http://www.ic.gc.ca/ 

## **6.3 Taiwan** 

The RN2903 module has received compliance approval in accordance with the Telecommunications Act. Customers seeking to use the compliance approval in their product should contact Microchip Technology sales or distribution partners to obtain a Letter of Authority. 

Integration of this module into a final product does not require additional radio certification provided installation instructions are followed and no modifications of the module are allowed. 

## 6.3.1 LABELING AND USER INFORMATION REQUIREMENTS 

The RN2903 module is labeled with its own NCC mark and certificate number as below: 

Specific Absorption Rate (SAR) evaluation is required if the separation distance between the user and/or bystander and the antenna and/or radiating element of the device is less than or equal to 20 cm. Exceptions are listed in RSS-102. Note that integration < 20 cm will require further certification with IC such as a Multiple listing and Class IV Permissive Change application. 

## 6.2.3 APPROVED EXTERNAL ANTENNA TYPES 

Transmitter Antenna (from Section 7.1.2 RSS-Gen, Issue 3, December 2010): 

The RN2903 module can only be sold or operated with antennas with which it was approved. Transmitter may be approved with multiple antenna types. An antenna type comprises antennas having similar in-band and out-of-band radiation patterns. Testing shall be performed using the highest gain antenna of each combination of transmitter and antenna type for which approval is being sought, with the transmitter output 

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**RN2903** 

The user’s manual should contain below warning (for RF device) in traditional Chinese: 

## 6.3.2 HELPFUL WEB SITES 

National Communications Commission (NCC): http://www.ncc.gov.tw 

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## **NOTES:** 

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**RN2903** 

## **APPENDIX A: REVISION HISTORY** 

## **Revision A (July 2015)** 

This is the initial release of this document. 

## **Revision B (December 2015)** 

This revision includes the following updates: 

- Updated Deep Sleep value in Table 2-3 

- Updated Dimensions value in Table 2-4 

- Updated Figure 4-1 

- Updated Figure 4-2 

- Updated Figure 5-2 

- Updated information for **Section 5.1 “RF Trace Layout Design”** . 

## **Revision C (February 2017)** 

This revision includes the following updates: 

- Updated Figure 1-2 and Figure 3-1 

- Updated Table 1-1, Table 2-2, Table 2-3, Table 2-5 and Table 5-1 

- Added Table 2-6 

- Updated **Section 3.4 “RESET Pin”** 

- Added **Section 3.6 “Internal Program Pins”** , **Section 5.2 “PCB Trace Antenna”** and **Section 6.2.2 “RF EXPOSURE”** 

- Deleted Section “5.4 Application Schematic”. 

## **Revision D (October 2017)** 

This revision includes the following updates: 

- Removed Australia and New Zealand from **Section 6.0 “Regulatory Approval”** . 

- Updated General Features section to remove Australia and New Zealand. 

- Updated General Features section to add Taiwan. 

- Added Taiwan to **Section 6.0 “Regulatory Approval”** . 

## **Revision E (January 2018)** 

This revision includes the following updates: 

- Updated **Section 6.0 “Regulatory Approval”** to correct information for Taiwan. 

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**RN2903** 

## **NOTES:** 

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**RN2903** 

## **THE MICROCHIP WEB SITE** 

Microchip provides online support via our WWW site at www.microchip.com. This web site is used as a means to make files and information easily available to customers. Accessible by using your favorite Internet browser, the web site contains the following information: 

- **Product Support** – Data sheets and errata, application notes and sample programs, design resources, user’s guides and hardware support documents, latest software releases and archived software 

- **General Technical Support** – Frequently Asked Questions (FAQ), technical support requests, online discussion groups, Microchip consultant program member listing 

## **CUSTOMER SUPPORT** 

Users of Microchip products can receive assistance through several channels: 

- Distributor or Representative 

- Local Sales Office 

- Field Application Engineer (FAE) 

- Technical Support 

Customers should contact their distributor, representative or Field Application Engineer (FAE) for support. Local sales offices are also available to help customers. A listing of sales offices and locations is included in the back of this document. 

**Technical support is available through the web site at: http://microchip.com/support** 

- **Business of Microchip** – Product selector and ordering guides, latest Microchip press releases, listing of seminars and events, listings of Microchip sales offices, distributors and factory representatives 

## **CUSTOMER CHANGE NOTIFICATION SERVICE** 

Microchip’s customer notification service helps keep customers current on Microchip products. Subscribers will receive e-mail notification whenever there are changes, updates, revisions or errata related to a specified product family or development tool of interest. 

To register, access the Microchip web site at www.microchip.com. Under “Support”, click on “Customer Change Notification” and follow the registration instructions. 

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## **NOTES:** 

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## **PRODUCT IDENTIFICATION SYSTEM** 

To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office. 

|**PART NO.**<br>**I**<br>**RM**<br>**XXX**<br>**Firmware**<br>**Package**<br>**Temperature**<br>**Range**<br>**Device**<br>**Device:**<br>RN2903A: Low-Power Long Range LoRa® Technology<br>Transceiver module<br>**Temperature Range:**<br>I<br>=<br>-40C to +85C (Industrial)<br>**Package:**<br>RM<br>=<br>Radio Module<br>**Revision**<br>**Number**|**Examples:**<br>RN2903A-I/RM: Industrial temperature|
|---|---|



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## **NOTES:** 

DS50002390E-page 24 

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## **Note the following details of the code protection feature on Microchip devices:** 

- Microchip products meet the specification contained in their particular Microchip Data Sheet. 

- Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions. 

- There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data Sheets. Most likely, the person doing so is engaged in theft of intellectual property. 

- Microchip is willing to work with the customer who is concerned about the integrity of their code. 

- Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not mean that we are guaranteeing the product as “unbreakable.” 

Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act. 

Information contained in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE **.** Microchip disclaims all liability arising from this information and its use. Use of Microchip devices in life support and/or safety applications is entirely at the buyer’s risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights unless otherwise stated. 

_Microchip received ISO/TS-16949:2009 certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona; Gresham, Oregon and design centers in California and India. The Company’s quality system processes and procedures are for its PIC[®] MCUs and dsPIC[®] DSCs, KEELOQ[®] code hopping devices, Serial EEPROMs, microperipherals, nonvolatile memory and analog products. In addition, Microchip’s quality system for the design and manufacture of development systems is ISO 9001:2000 certified._ 

## **QUALITY MANAGEMENT  SYSTEM** 

## **CERTIFIED BY DNV** 

## **Trademarks** 

The Microchip name and logo, the Microchip logo, AnyRate, AVR, AVR logo, AVR Freaks, BeaconThings, BitCloud, CryptoMemory, CryptoRF, dsPIC, FlashFlex, flexPWR, Heldo, JukeBlox, KEELOQ, KEELOQ logo, Kleer, LANCheck, LINK MD, maXStylus, maXTouch, MediaLB, megaAVR, MOST, MOST logo, MPLAB, OptoLyzer, PIC, picoPower, PICSTART, PIC32 logo, Prochip Designer, QTouch, RightTouch, SAM-BA, SpyNIC, SST, SST Logo, SuperFlash, tinyAVR, UNI/O, and XMEGA are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. 

ClockWorks, The Embedded Control Solutions Company, EtherSynch, Hyper Speed Control, HyperLight Load, IntelliMOS, mTouch, Precision Edge, and Quiet-Wire are registered trademarks of Microchip Technology Incorporated in the U.S.A. 

Adjacent Key Suppression, AKS, Analog-for-the-Digital Age, Any Capacitor, AnyIn, AnyOut, BodyCom, chipKIT, chipKIT logo, CodeGuard, CryptoAuthentication, CryptoCompanion, CryptoController, dsPICDEM, dsPICDEM.net, Dynamic Average Matching, DAM, ECAN, EtherGREEN, In-Circuit Serial Programming, ICSP, Inter-Chip Connectivity, JitterBlocker, KleerNet, KleerNet logo, Mindi, MiWi, motorBench, MPASM, MPF, MPLAB Certified logo, MPLIB, MPLINK, MultiTRAK, NetDetach, Omniscient Code Generation, PICDEM, PICDEM.net, PICkit, PICtail, PureSilicon, QMatrix, RightTouch logo, REAL ICE, Ripple Blocker, SAM-ICE, Serial Quad I/O, SMART-I.S., SQI, SuperSwitcher, SuperSwitcher II, Total Endurance, TSHARC, USBCheck, VariSense, ViewSpan, WiperLock, Wireless DNA, and ZENA are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. 

SQTP is a service mark of Microchip Technology Incorporated in the U.S.A. 

Silicon Storage Technology is a registered trademark of Microchip Technology Inc. in other countries. 

GestIC is a registered trademark of Microchip Technology Germany II GmbH & Co. KG, a subsidiary of Microchip Technology Inc., in other countries. 

All other trademarks mentioned herein are property of their respective companies. 

- © 2015-2018, Microchip Technology Incorporated, All Rights Reserved. 

ISBN: 978-1-5224-2541-0 

## == == **ISO/TS 16949** 

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## **Worldwide Sales and Service** 

## **AMERICAS** 

**Corporate Office** 2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-792-7200 Fax: 480-792-7277 Technical Support: http://www.microchip.com/ support Web Address: www.microchip.com 

**Atlanta** Duluth, GA Tel: 678-957-9614 Fax: 678-957-1455 

**Austin, TX** Tel: 512-257-3370 

**Boston** Westborough, MA Tel: 774-760-0087 Fax: 774-760-0088 

**Chicago** Itasca, IL Tel: 630-285-0071 Fax: 630-285-0075 

**Dallas** Addison, TX Tel: 972-818-7423 Fax: 972-818-2924 

**Detroit** Novi, MI Tel: 248-848-4000 

**Houston, TX** Tel: 281-894-5983 

**Indianapolis** Noblesville, IN Tel: 317-773-8323 Fax: 317-773-5453 Tel: 317-536-2380 

**Los Angeles** Mission Viejo, CA Tel: 949-462-9523 Fax: 949-462-9608 Tel: 951-273-7800 

**Raleigh, NC** Tel: 919-844-7510 

**New York, NY** Tel: 631-435-6000 

**San Jose, CA** Tel: 408-735-9110 Tel: 408-436-4270 

**Canada - Toronto** Tel: 905-695-1980 Fax: 905-695-2078 

## **ASIA/PACIFIC** 

**Australia - Sydney** Tel: 61-2-9868-6733 **China - Beijing** Tel: 86-10-8569-7000 

**China - Chengdu** Tel: 86-28-8665-5511 

**China - Chongqing** Tel: 86-23-8980-9588 **China - Dongguan** Tel: 86-769-8702-9880 

**China - Guangzhou** Tel: 86-20-8755-8029 

**China - Hangzhou** Tel: 86-571-8792-8115 

**China - Hong Kong SAR** Tel: 852-2943-5100 

**China - Nanjing** Tel: 86-25-8473-2460 

**China - Qingdao** Tel: 86-532-8502-7355 

**China - Shanghai** Tel: 86-21-3326-8000 

**China - Shenyang** Tel: 86-24-2334-2829 

**China - Shenzhen** Tel: 86-755-8864-2200 

**China - Suzhou** Tel: 86-188-6233-1526 

**China - Wuhan** Tel: 86-27-5980-5300 

**China - Xian** Tel: 86-29-8833-7252 

**China - Xiamen** Tel: 86-592-2388138 

**China - Zhuhai** Tel: 86-756-3210040 

## **ASIA/PACIFIC** 

**India - Bangalore** Tel: 91-80-3090-4444 **India - New Delhi** Tel: 91-11-4160-8631 

**India - Pune** Tel: 91-20-3019-1500 **Japan - Osaka** Tel: 81-6-6152-7160 

**Japan - Tokyo** Tel: 81-3-6880- 3770 

**Korea - Daegu** Tel: 82-53-744-4301 

**Korea - Seoul** Tel: 82-2-554-7200 

**Malaysia - Kuala Lumpur** Tel: 60-3-7651-7906 

**Malaysia - Penang** Tel: 60-4-227-8870 **Philippines - Manila** Tel: 63-2-634-9065 

**Singapore** Tel: 65-6334-8870 

**Taiwan - Hsin Chu** Tel: 886-3-577-8366 

**Taiwan - Kaohsiung** Tel: 886-7-213-7830 

**Taiwan - Taipei** Tel: 886-2-2508-8600 

**Thailand - Bangkok** Tel: 66-2-694-1351 

**Vietnam - Ho Chi Minh** Tel: 84-28-5448-2100 

## **EUROPE** 

**Austria - Wels** Tel: 43-7242-2244-39 Fax: 43-7242-2244-393 

**Denmark - Copenhagen** Tel: 45-4450-2828 Fax: 45-4485-2829 

**Finland - Espoo** Tel: 358-9-4520-820 

**France - Paris** Tel: 33-1-69-53-63-20 Fax: 33-1-69-30-90-79 

**Germany - Garching** Tel: 49-8931-9700 **Germany - Haan** Tel: 49-2129-3766400 

**Germany - Heilbronn** Tel: 49-7131-67-3636 

**Germany - Karlsruhe** Tel: 49-721-625370 

**Germany - Munich** Tel: 49-89-627-144-0 Fax: 49-89-627-144-44 

**Germany - Rosenheim** Tel: 49-8031-354-560 

**Israel - Ra’anana** Tel: 972-9-744-7705 

**Italy - Milan** Tel: 39-0331-742611 Fax: 39-0331-466781 

**Italy - Padova** Tel: 39-049-7625286 

**Netherlands - Drunen** Tel: 31-416-690399 Fax: 31-416-690340 

**Norway - Trondheim** Tel: 47-7289-7561 

**Poland - Warsaw** Tel: 48-22-3325737 

**Romania - Bucharest** Tel: 40-21-407-87-50 

**Spain - Madrid** Tel: 34-91-708-08-90 Fax: 34-91-708-08-91 

**Sweden - Gothenberg** Tel: 46-31-704-60-40 

**Sweden - Stockholm** Tel: 46-8-5090-4654 

**UK - Wokingham** Tel: 44-118-921-5800 

Fax: 44-118-921-5820 

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