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Texas Instruments TRF4903 User Manual

With mtexas instruments msp430 demonstration and development
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TRF4903 With MSP430 Demonstration and Development
This document presents the contents of the TRF4903 demonstration and development
tool
kit.
MSP-TRF4903-DEMO kit and describes its hardware and software. Users should
understand the MSP430F449, TRF6903, and the TRF4903 to obtain the full benefit of
this user manual.
Different topics covered in this manual may require different levels of expertise. The
first two chapters are focused on how the kit operates.
If you want to build your own prototype, review the third chapter on how to load
firmware. The later chapters cover hardware and software topics that may require some
additional expertise.
Other related Texas Instruments information includes the following that may be helpful:
TRF4903 data sheet
TRF6903 data sheet
MSP430F449 data sheet
TRF6903 Design Guide
TRF6901 FAQ
For design and product information related to the TRF6903, MSP430, and similar products,
go to:
http://www.ti.com/ismrf
http://www.msp430.com
PDF documents and zip files may be located on Texas Instruments' website by typing in the
literature number in the Search text box; for example, typing in SWRS022 will locate the
TRF6903 data sheet.
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Prototyping
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6
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SWRU010A - October 2004 - Revised May 2005
The
user
manual
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SWRU010A - October 2004 - Revised May 2005
provides
information
SWRS023
SWRS022
SLAS344
SWRU009
SLAD008
Contents
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List of Figures
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TRF4903 With MSP430 Demonstration and Development Evaluation Kit
User's Guide
Evaluation Kit
on
how
to
operate
the
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Summary of Contents for Texas Instruments TRF4903

  • Page 1: Table Of Contents

    For design and product information related to the TRF6903, MSP430, and similar products, go to: http://www.ti.com/ismrf http://www.msp430.com PDF documents and zip files may be located on Texas Instruments’ website by typing in the literature number in the Search text box; for example, typing in SWRS022 will locate the TRF6903 data sheet. Contents ..............

  • Page 2: Trf4903 Demonstration And Evaluation Kit Overview

    Equipment Requirement The following equipment is not included in this kit and is required to operate the MSP-TRF4903-DEMO kit: • Four AAA batteries • MSP430 bus expansion cable for the JTAG connector, required only for prototyping purposes.
  • Page 3 The demo kit has two circuit boards. The first circuit board (unit) is the transmitter and consists of a TRF4903 RF transmitter and a MSP430F449 microcontroller. The second circuit board in the kit is a receiver and consists of a TRF6903 RF transceiver and a MSP430F449 microcontroller. The TRF6903 board is capable of sending and receiving half-duplex wireless data on the European and North American/US ISM bands.

  • Page 4: Top-Side, Back-Side Of The Trf4903 Demonstration Board

    Demonstrating a Wireless Link c-1 c-2 Figure 1. Top-Side, Back-Side of the TRF4903 Demonstration Board TRF4903 With MSP430 Demonstration and Development Evaluation Kit SWRU010A – October 2004 – Revised May 2005...
  • Page 5 A simple game is implemented in the firmware to demonstrate unidirectional RF communication between the TRF4903 transmit board and the TRF6903 configured in the receive mode. The user starts the game by pushing any sequence of four colored buttons. The corresponding colored LED’s light up on the receive board in the same sequence.
  • Page 6 2.2.3 Wireless Demonstration Only the TRF4903 transmit board is configured to initiate wireless communication. Assume that Board A is the transmit board and transmits the first four-button transmitted sequence and Board B receives the transmission.
  • Page 7 2.2.4 RSSI Indicator Since the TRF4903 is a transmitter, it does not have an RSSI feature. The TRF6903 receive board is equipped with a receive signal strength indicator (RSSI) that illustrates the signal strength on the receiver. Four levels are used to indicate signal strength. Red is the lowest and means no signal was received, while green indicates the highest level of signal strength.

  • Page 8: Jtag Connector

    Figure 2. JTAG Connector Loading the MSP430 With the FIrmware The MSP-TRF4903-DEMO comes with source code installed on the MSP430 to run the demo program. The user can develop new application software that can be downloaded to the MSP430 MCU through the JTAG connector.

  • Page 9: Pcb Hardware Overview

    Hardware Overview The TRF4903 ISM-band transmitter IC operates from 315 MHz to 950 MHz. It has low power consumption and an operating voltage of 2.2 V to 3.6 V. It features an integer-N PLL synthesizer and supports FSK and OOK operation.
  • Page 10 Figure 4. Block Diagram of the MSP430F44x Demo Board Schematics See SWRR009 for the TRF4903 transmit side schematics and SWRR001 for the TRF6903 receiver side schematics. All the schematics for the demonstration boards can be found at http://www.ti.com/ismrf . Top and Bottom Silk Screen and Drawing...
  • Page 11 200 Ω RES, 0603, 5%, 200 Ω R61, R62, R63 1 kΩ RES, 0603, 5%, 1 kΩ 7.5 kΩ RES, 0603, 5%, 7.5 kΩ SWRU010A – October 2004 – Revised May 2005 TRF4903 With MSP430 Demonstration and Development Evaluation Kit...
  • Page 12 Seiko 628-SPT1A-0368 XTAL, SMT, 32.768 kHz, CM202 Alternate Hardware Configurations The MSP-TRF4903-DEMO kit is preconfigured to function under the following assumptions: • North American ISM frequency band, 902-928 MHz • NRZ (non-return to zero) coding • FSK (frequency shift keying) •...
  • Page 13 No hardware changes are needed, but the antenna matching is not optimized for this band. See the Operating the TRF4903 Demo Kit in the 868-MHz EU ISM Band application note (SWRA047) for further information. The firmware for the 868-MHz EU band can be downloaded from the http://www.ti.com/ismrf website.

  • Page 14: Software Overview

    MSP430 reset pin (RST) to ground at the JTAG connector (preferred method), or remove R42, which disables the voltage supply to the MSP430. The TRF4903 can then be controlled directly through J5, the 14-pin surface-mount header.
  • Page 15 After power up initialization, the controller is configured as a state machine to run the link demonstration. Figure 8 illustrates the state machine flowchart for the TRF4903 transmit board and the TRF6903 receive board. Buttons and timer functions are handled through interrupt subroutines.
  • Page 16 All Response Button | 3 sec. Timeout Transmit_Packet Received Response Packet | 5 Second Timed Out LED_Response _Result Figure 9. Game Application FLow Chart – Receive Mode TRF4903 With MSP430 Demonstration and Development Evaluation Kit SWRU010A – October 2004 – Revised May 2005...
  • Page 17 Wireless Data Stream The wireless data stream for the game application is implemented as follows: • User initiates an RF transmission on Board A (TRF4903 demo board) by pushing four buttons in any sequence. • User sequence is sent to Board B (TRF6903 demo board) using the transmission data packet...
  • Page 18 4). The checksum byte is calculated by summing the first 5 bytes of the packet and ignoring overflow. TRF4903 Registers The TRF4903 has five control registers (A through E) that are initialized using an on-chip serial port interface (SPI). Table 5 shows the values loaded into the registers by the microprocessor during demo program initialization.
  • Page 19 Software Overview 5.5.1 program_TRF4903_word() This function configures one of the five registers of the TRF4903 transceiver. Here is a sample code on how to use this function so that you can program all five registers: struct REGA_BITS{ unsigned long BND:2;...
  • Page 20 The Modulation box should be set to FSK. For initial evaluation, set TXM=0 and TXDATA to Low. The Multiplex Terminal List box can be used to define the output at terminal 16 of the TRF4903. Other communication utilities such as HyperTerminal or ProComm can be used in place of the external software GUI to control the TRF4903 in pass-through mode.
  • Page 21 EU band. The firmware can be downloaded from the www.ti.com/ismrf website. See the Operating the TRF4903 With MSP430 Evaluation Kit in the 868 MHZ European ISM Band application report (SWRA047) for detailed information on the 868-MHz EU operation Mode.

  • Page 22: Schematics

    SCHEMATICS SCHEMATICS The following figures are the schematics for the TRF4903. REVISIO NS VSS 3.5−6.0 VDC VCC_RF ZONE DESCRIPTION DATE APPROVED TP_GRN TP_GRN TP_GRN TP_RED INITIAL RELEASE 7−9−04 OPTIONAL,DNP LDO REGULATOR HEADER 3 4.9152MHZ BAT1 BAT−SW2 BAT−S W 10pF...
  • Page 23 WHOLLY) IN ANY MANNER WITHOUT PRIOR EXPRESS WRITTEN AUTHORIZA TION OF CNOWIRE TECHNOLOGY INC. Date: Wednesday, March 09, 2005 Sheet Figure 13. Schematic (Page 2) SWRU010A – October 2004 – Revised May 2005 TRF4903 With MSP430 Demonstration and Development Evaluation Kit...
  • Page 24 WHOLLY) IN ANY MANNER WITHOUT PRIOR EXPRESS WRITTEN Date: Thursday, October 21, 2004 Sheet AUTHORIZA TION OF CNOWIRE TECHNOLOGY INC. Figure 14. Schematic (Page 3) TRF4903 With MSP430 Demonstration and Development Evaluation Kit SWRU010A – October 2004 – Revised May 2005...
  • Page 25 TI product or service and is an unfair and deceptive business practice. TI is not responsible or liable for any such statements. Following are URLs where you can obtain information on other Texas Instruments products and application solutions:...
  • Page 26 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Texas Instruments MSP-TRF4903-DEMO...