3 Anaren Integrated Radio A2541R24x User’s Manual Release Date: 11/22/13
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iii USER’S MANUAL Models A2541R24A and A2541R24C Contents 1. Overview .......................................................................................................................................................... 5 1.1. A2541R24A .................................................................................................................................................5 1.2. A2541R24C ..........................................................................................................
.3.1. 4.3.2. Manual Mounting Procedure ........................................................................................................... 32 Automated Mounting Procedure ......................................................................................................
A2541R24x – User’s Manual Release Date 11/22/13 Page 5 of 36 1. Overview The A2541R24A and A2541R24C are surface mount 2.4GHz RF transceivers incorporating Bluetooth® SMART technology per the Bluetooth v4.0 core specification. The A2541R24A has an integral antenna, whereas the A2541R24C utilizes an external antenna through a U.FL connector (see Table 1).
A2541R24x – User’s Manual Release Date 11/22/13 Page 6 of 36 1.2. A2541R24C The A2541R24C has a compact antenna connector that allows for locating the antenna away from the module due to form/function or in order to exit a metal enclosure. Please see Table 1 for a list of approved antennas. 1.3. Features Features: 2.4 GHz incorporating Bluetooth Smart technology and Proprietary RF Systemon-Chip 2.0 to 3.
A2541R24x – User’s Manual Release Date 11/22/13 Page 7 of 36 Very Small package size: 11mm x 19mm x 2.5mm Approximate weight 0.7 grams 1.4. Theory of Operation The A2541R24A and A2541R24C modules operate in the global 2.4 GHz ISM/SRD frequency band. They can be used to implement a variety of networks, including point to point, point to multi-point, peer to peer and mesh networks. Figure 1 and Figure 2 show the functionality of A2541R24A and A2541R24C, respectively.
Page 8 of 36 A2541R24x – User’s Manual Release Date 11/22/13 Figure 2 The functionality of the A2541R24C, using an external antenna The description of the functional blocks shown in Figure 1 and Figure 2 is given as follows: Antenna o The antenna couples energy between the air and the module. The integral antenna and the external monopole antenna, both centered at 2441.
A2541R24x – User’s Manual Release Date 11/22/13 o Page 9 of 36 Power management ensures a stable supply for the internal functions, as well as providing means for a low power sleep mode. CPU and Memory o The 8051 CPU core used in the CC2541 device is a single-cycle 8051compatible core. It has three different memory-access buses (SFR, DAT and CODE/XDATA) with single-cycle access to SFR, DATA, and the main SRAM. It also includes a debug interface and an 18-input extended interrupt unit.
A2541R24x – User’s Manual Release Date 11/22/13 Page 10 of 36 Figure 3 Internal connections for TPS62730 Step-Down Converter Table 1 Approved Antennas Item Part Number 1 2 3 Integral part of A2541R24A 66089-2406 66089-2430 1.5.
A2541R24x – User’s Manual Release Date 11/22/13 Page 11 of 36 2. Approvals and Usage The A2541R24A and A2541R24C have been designed to meet many national regulations for worldwide ISM band use. In particular, the radio modules have been certified to the following standards. 2.1. Product Approvals 2.1.1. USA (Federal Communications Commission, FCC) The A2541R24A and A2541R24C modules have been tested to comply with FCC CFR47 Part 15 sub-part C “Intentional Radiators” standard.
A2541R24x – User’s Manual Release Date 11/22/13 Page 12 of 36 2.1.1.2. End User Manual The end user manual 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.
A2541R24x – User’s Manual Release Date 11/22/13 Page 13 of 36 From section 3.2 RSS-Gen, Issue 3, December 2010, Modular Approval for Category I Equipment or Category II Equipment: “Modular approval permits the installation of the same module in a host device or multiple host devices without the need to recertify the device. Equipment certification for a modular device may be sought for either Category I equipment or Category II equipment.
A2541R24x – User’s Manual Release Date 11/22/13 Page 14 of 36 In section 7.1.2 Transmitter Antenna, it has been mentioned that the user manuals for transmitters equipped with detachable antennas shall also contain the following notice in a conspicuous location: Notice: This radio transmitter (IC: 8975A-A12062101) 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.
A2541R24x – User’s Manual Release Date 11/22/13 Page 15 of 36 thereof). Each model shall be identified by a unique combination of a model number and a certification number, which are assigned as described below in this section. The label shall be securely affixed to a permanently attached part of the device, in a location where it is visible or easily accessible to the user, and shall not be readily detachable.
A2541R24x – User’s Manual Release Date 11/22/13 Page 16 of 36 2.1.2.2. RF Exposure All transmitters regulated by IC must comply with RF exposure limits as set forth in RSS-102, Issue 4, section 4, “Exposure Limits”. Furthermore RSS-102, Issue 4, Section 2 “Certification Requirements”, provides assistance in determining the specific requirements for compliance.
A2541R24x – User’s Manual Release Date 11/22/13 Page 17 of 36 The end user is responsible for ensuring compliance with harmonized frequencies and labeling requirements for each country the end device is marketed and sold. For more information see: Radio And Telecommunications Terminal Equipment (R&TTE) http://ec.europa.eu/enterprise/rtte/index_en.htm European Conference of Postal and Telecommunications Administrations (CEPT) http://www.cept.
A2541R24x – User’s Manual Release Date 11/22/13 Page 18 of 36 assessment) will enable the user to find channels with minimal interference from WLAN devices. Figure 4 WLAN channels 2.2.2. Classic Bluetooth Classic Bluetooth divides the 2.402-2.480 GHz band into 79 channels, each of which is 1MHz wide.
A2541R24x – User’s Manual Release Date 11/22/13 Page 19 of 36 2.2.5. Time critical data If the user requires specific time critical data throughput that cannot tolerate the delays of potentially many re-transmissions, the user is encouraged to implement an environment-aware algorithm that periodically monitors/scans the frequency band and maintains a list of “best available” channels.
A2541R24x – User’s Manual Release Date 11/22/13 Page 20 of 36 2.3. Approved Usage The A2541R24A and A2541R24C modules have been approved for use in the US, Canada and Europe. The user is encouraged to use minimum power required to establish a link, thus minimizing interference. Changes or modifications to the module and/or operation outside the limits are prohibited and could void the user’s authority to operate the modules. 2.3.1.
A2541R24x – User’s Manual Release Date 11/22/13 Page 21 of 36 Table 3 Output Power vs. PA Table Value (tolerance +/- 1.5 dB) Power (dBm) PA_Table Value [Hex] 1.0 0.0 -1.5 -3.0 -5.0 -7.0 -9.5 -11.0 -13.5 -15.0 -17.0 -19.0 -21.0 -23.0 -25.0 -27.0 0xEF 0xE1 0xD1 0xC1 0xB1 0xA1 0x91 0x81 0x71 0x61 0x51 0x41 0x31 0x21 0x11 0x01 2.3.2. Europe For Europe, the maximum allowed output power is 100mW with a spectral power density limit of 10mW/MHz.
A2541R24x – User’s Manual Release Date 11/22/13 Page 22 of 36 3. Electrical Characteristics 3.1. Absolute Maximum Ratings Under no circumstances shall the absolute maximum ratings given in Table 4 be violated. Stress exceeding one or more of the limiting values may cause permanent damage to the device. Caution! ESD sensitive device. Precaution should be used when handling the device in order to prevent permanent damage.
A2541R24x – User’s Manual Release Date 11/22/13 3.2. Page 23 of 36 Operating Conditions Table 5 Operating conditions Parameter Min Max Unit Supply Voltage (Vdd) 2 3.6 V Temperature Range -40 +85 ˚C 3.3. Condition/Note Pin Out The A2541R24A and A2541R24C radios share a common pin-out and foot print, thus enabling the use of the same application PCB layout for US/Europe and low power (short range) versus higher power (long range).
A2541R24x – User’s Manual Release Date 11/22/13 Page 24 of 36 Pin Name Pin Type Description 1, 3,12, 14, 22, 34 GND Common Ground Connect to GND 2 DNC 4 VDD_OUT Power (Analog) 5 CONV_STAT Digital Output 6 7-9 NC P2_2 - P2_0 Digital I/O DC-DC Converter Status pin. Open-drain with a 3.3kΩ series resistor Pin is not internally connected General-purpose digital I/O pin Port 2.2 - Port 2.0 10 - 11 P1_7 - P1_6 Digital I/O General-purpose digital I/O pin Port 1.7 - Port 1.
A2541R24x – User’s Manual Release Date 11/22/13 Page 25 of 36 3.3.2. A2541R24x20 (Module with Emmoco EM-Ware Firmware) Where applicable: NC = “NO Connection”. NOT connected internally. Pin is DNC = “Do Not Connect”. Pin reserved for internal use, ensure mating footprint pads are isolated. GND = “Ground”. Connect the maximum number possible (minimum one for proper operation). References in (parentheses) show native CC2541 pin function.
A2541R24x – User’s Manual Release Date 11/22/13 Page 26 of 36 Pin Type Description 1, 3,12, 14, 22, 34 GND Common Ground Connect to GND 2 DNC 4 VDD_OUT Power (Analog) 5 CONV_STAT Digital Output 6 7 8 NC (P2_2) (P2_1) 9, 23, 25 STATUS 10 RXD 11 TXD 13 SCL 15 SDA 16 CONV_ON/ BYP_CNTRL 17 RTS# 18 CTS# 19 21 24 26 27 28 29 30 31 32 (P1_3) CONV_ON/ BYP_READ DNC (P0_7) RTS# CTS# TXD RXD (P0_1) CONTROL RESET_N 33 VDD_IN 20 CC2541 PIN Pin Name TPS62730 PIN Pin Number Tabl
A2541R24x – User’s Manual Release Date 11/22/13 3.4. Recommended Layout Page 27 of 36 (dimensions in mm) Figure 7 Recommended PCB footprint.
Page 28 of 36 A2541R24x – User’s Manual Release Date 11/22/13 Figure 8 Recommended Layout for GND vias
A2541R24x – User’s Manual Release Date 11/22/13 Figure 9 Mounting the module in a corner Page 29 of 36 Figure 10 Mounting the module along an edge “No GND” area is optional for A2541R24C modules. It may still be provided for compatibility with the internal antenna version (A2541R24A). 3.5.
A2541R24x – User’s Manual Release Date 11/22/13 Page 30 of 36 4. Mechanical and Process 4.1. Radio Module Details (dimensions in mm) 4.1.1. A2541R24A Figure 11 A2541R24A dimensions 4.1.2.
A2541R24x – User’s Manual Release Date 11/22/13 4.2. Packaging Details Page 31 of 36 (dimensions in mm) AIR modules are available in Matrix Tray and Tape & Reel packaging for high-volume assembly. Details of packaging provided below: 4.2.1. Matrix Tray Packaging Figure 13 A2541R24AxxGM and A2541R24CxxGM Matrix Tray Packaging Detail (27/Tray) 4.2.2.
A2541R24x – User’s Manual Release Date 11/22/13 Page 32 of 36 4.3. Soldering AIR Modules may be mounted either manually (for prototyping or low volume production), or automatically for high-volume production. A no-clean tin/silver/copper (SAC) solder is recommended, however lead based no-clean pastes may also be used. CAUTION: AIR Modules are designed for no-clean fluxes only. DO NOT use waterbased fluxes that require aqueous cleaning after solder.
A2541R24x – User’s Manual Release Date 11/22/13 Page 33 of 36 4.3.2. Automated Mounting Procedure The AIR Radio Module recommended solder reflow profile is based on IPC/JEDEC J-STD-020.
Page 34 of 36 A2541R24x – User’s Manual Release Date 11/22/13
A2541R24x – User’s Manual Release Date 11/22/13 Page 35 of 36 DOCUMENT HISTORY Date 05/16/13 05/19/13 05/22/13 06/03/13 10/14/13 Author Sula Richardson Richardson Richardson Sula 10/28/13 Sula 11/22/13 Sula Change Note No./Notes Initial Draft Updated RF Exposure Updated RF Exposure Updated multiple sections Updated multiple sections Added info about DC-DC converter operation, updated multiple sections and figures Added subsections 2.1.4 and 2.3.3.
Attach distributor contact information here If you have additional questions, need samples, or would like a quote – please email the AIR team at AIR@anaren.com . For a full list of our franchised distributors, please visit our website: http://www.anaren.com/air/ Anaren Microwave, Inc. 6635 Kirkville Road East Syracuse, NY 13057 Tel: +1 315 432 8909 +1 800 411 6596 Fax: +1 315 432 8970 Anaren Microwave (Europe), Inc.