Low Power RF & Wireless Connectivity

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  • Forum Post: TRF7960 harmonics

    Zvonko Antonic
    I am looking for solution to get rid of high harmonics in RF signal. I am using " Application Schematic for the TRF796x EVM (SPI Mode)" from TI. I am getting RF emission from 8,9,10,11,12,19,20,21,22,23 harmonics. All of them exceed FCC and CE limits (most of them for 15dB or more). In the...
    on Oct 28, 2010

  • Forum Post: the IRQStatus of TRF7960 is 0x00

    xiaojiao liao
    Sir or Miss: When I port the TRF7960EVM Program(MSP430) to cortex m3 (ST's STM32),I have one big problem, the IRQ Register(IRQStatus) will be 0x00. First I description my hardware and software. Hardware: I used the GPIOs as SPI with SS to cummunicate with the TRF7960 , and i directly...
    on Jun 27, 2011

  • Forum Post: NFC Energy Harvest

    Alexander Schwartz
    Hi All, I'm upgrading an existing product from TRF7960 to the new TRF7970A to add it NFC capability and I was wandering whether it's possible to harness the energy from the RF field to charge a rechargeable battery? Is there any way to get the rectified voltage from the TRF7970 or should...
    on Oct 12, 2011

  • Forum Post: TRF7960 EVM Source Code

    KONSTANTIN GROMOV
    Hello, Does any body know where can I get a complete source code for the TFR7960 EVM module (one that has USB plug)? Is it even possible? I got a sample code that is doing tag scan. But I would like to have a complete a functionality on unit that I am developing right now so I can debug and...
    on Oct 28, 2011

  • Forum Post: TRF7960 oscillator startup problems

    johann jeuschnigger
    Hello My Name is John, I´m working with a TRF7960 , and have problems on power up with the crystal oszillator. Sometimes it doesn´t start, sometimes it delivers 60kHz on the SYS_CLK, sometimes it delivers a much higher frequency I use the SYS_CLK Pin with the clock setting 13,56...
    on Jan 17, 2012

  • Forum Post: HF RFID response time using TRF7960EVM with the MSP430F2370 MCU

    Vladimir Nohava
    Hello, Playing around with the TRF7960EVM, I hooked up my scope and set the following under the TFF7960 EVM control application under Test t ab using Firmware Revision 06_16_2011 (programmed LED5 to have trigger out) 0x10 Write single register - Chip Status Control (00h) "21" and ISO...
    on Apr 11, 2012

  • Forum Post: RE: TRF7960 and MiFare

    Jethin Sekhar
    Hi All, I am very new to the 14443A protocol and mifare Clasic 4k Tag. I have a TRF7960A RFID reader interfaced to my device which is supporting Mifare mode after reading the Firmware version. I got some information from my vendor but still i am facing issue in authentication. I have pasted the Commands...
    on May 17, 2012

  • Forum Post: RE: How to use TRF7970A read/write mifare classic

    Jethin Sekhar
    Hi Josh, I have interface TRF7960A with to my OMAP device through serial port and i have been using RFID Plus tag till this time. Now i need to switch to Mifare Classic 4K, but i am new to 14443A and mifare cards.Can you help me in providing some useful links to start? I have read back the firmware...
    on May 17, 2012

  • Forum Post: TRF7960AEVM　Controls the modulation depth

    Seishin
    Hi All, I am working on TRF7960EVM board. I want to change the modulation depth of ASK in the ISO15693 There is no change in the waveform I have the following settings on the GUI: ①Select COM　Port ②Register settings 　　　0x01 Register 　　　B7=0 　　　B6=1 　　　B5=1 　　　B4=0 　　　B3=0 　　　B2=0 　　　B1...
    on May 16, 2012

  • Forum Post: Collision problem using TRF7960A

    Val 83
    Hi, I am in trouble after spending days on the TRF7960A and using your sloc240 chronograms provided by Josh from TI. My problem is that using myfare classic tags, i get a 0x42 response to the IRQ status reading instead of 0x40 after an anticollision command. To be more precise here is the entire...
    on May 24, 2012

  • Forum Post: TRF7960 Questions

    Kojima, Takao
    Hello Champs, My customer are urgently asking us below questions. Could you help me to answer them? Q1. There is a description that about transition time from stand-by to active mode is 4.8ms in Table5-3. Whereas explanation for stand-by mode in page 17 describes, “Stand-by Mode (bit 7 = 1...
    on May 21, 2012

  • Forum Post: TRF7960A Problems

    Tan Duoc Bui
    I am testing TRF7960A samples. - VIN (pin 2) = 5V - EN2 (pin 25) = 0; - OSC : 13.56 MHz (pin 30/31) - VDD_X (pin 32) connect to VDD_I/O (pin 160 with filter caps. - VDD_PA (pin 4) connect to VDD_RF (pin 3) with filter caps. - Band Gap (pin 11) / VDD_A (pin 1) with filter caps - SSP configuration I...
    on May 22, 2012

  • Forum Post: TRF7960A RF input voltage

    Seishin
    Hi All, When the operating input voltage VIN = 3.3V, What is the maximum/minimum RF input voltage at RX_IN1/RX_IN2? Best Regards, Seishin
    on Jun 19, 2012

  • Forum Post: MSP430 Programming

    prem m
    Hi my name is Prem, I am working on a TRF 7960 EVM right now. I want to make some changes in the MSP430 program such that, we can send the data to another memory module when we connect the board to an external power supply and then we can retrieve the data when we connect the board to the computer. But...
    on Jul 16, 2012

  • Forum Post: Connecting copper wire antenna to TRF7960AEVM help

    Dave Wang
    Hello, I am trying to connect an antenna i made with copper wire to the TRF7960AEVM eval kit to experiment with, but have a few questions: 1) Does ANY copper wire work for this application? 2) Is there a guide on how to replace the original antenna from the eval kit with an external one? I could...
    on Aug 17, 2012

  • Forum Post: How to run in debug mode and distinguish two RFID tags in "Stand alone mode"?

    Henrik Zimmermann
    Hi I'm working on a project where I need the TRF7960EVM to work in "Stand alone mode" and detect if two or more 15693 tags are present. The indication can be very simple e.g. the LEDs on the EVM board. However the problem is to determine of there are more than one tag present. I have...
    on Aug 23, 2012

  • Forum Post: Where is the UID stored in source code for TRF7960/TRF7970 EVM

    Henrik Zimmermann
    The information obtained from the RFID tag seems to be stored in the variable "buf", which is an array with the length 300 and declared as unsigned 8 bit. In the code (ISO15693.c) there is a comment saying that "the first UID will be stored from buf[1] upwards", but a lot of other...
    on Aug 29, 2012

  • Forum Post: RE: 13.56MHz RFID Regulation

    Mark Stefanik
    Josh, Does the TI TRF7960 device have FCC "Modular Certification"? If not, I've been told the device/system does need to be certified by the FCC. In this case the reader will need to be tested to meet the requirements of FCC Part 15.225 and meet the antenna requirements of FCC Part...
    on Oct 9, 2012

  • Forum Post: Writing/Reading into an ISO14443 Tag with TRF7960 EVM board

    mahut guillaume
    Hi, I'm working with the TRF7960 EVM board. I need to write and read into an ISO14443a Tag. In the firmware code (host.c line 774), there is a function named "HostRequest14443A", with 3 parameters. I think this function is using for all request commands (and i hope read/write). If...
    on Jul 16, 2012

  • Forum Post: RE: Writing/Reading Mifare Tags through trf7960EVM

    tanmay middha
    hey no answer in 2 weeks. Thanks I tested this issue in each and every mifare classic card, each one is giving me same issue not able to select the tag. May be there is something wrong in protocol handling but i modified firmware according to application note given in TI site. Not getting SAK...
    on Nov 1, 2012

  • Forum Post: RE: RFID reader with TRF7960 and PIC24FJ128GA010

    javi garcia
    Hi, How I can read the UID card HF-I standard? I communicate with the TRF7960, read their records, but I can not read the UID card, Can anybody help? thanks
    on Dec 20, 2012

  • Forum Post: RE: RFID reader with TRF7960 and PIC24FJ128GA010

    javi garcia
    Hi Josh, I have adjusted both registers as you say, Chip Status Control Register and ISO Control the data sent by the SPI to configure the TRF7960 are: 0x20;0x20;0x00;0x00;0xC2;0x00;0x80;0x14;0x1F;0x31;0x40;0x87;0x3E I can read the chip the registers. buf I try to read the card I use this sequence...
    on Dec 20, 2012

  • Forum Post: RE: RFID reader with TRF7960 and PIC24FJ128GA010

    javi garcia
    Josh- the flag IRQ is generated by the port 13 of the TRF7960???if so, I get no signal from it. sending data tells me you, and I hope that this terminal do a interruption on my micro, but it does, It don´t the rissing. Thank for all
    on Dec 21, 2012

  • Forum Post: RE: RFID reader with TRF7960 and PIC24FJ128GA010

    javi garcia
    Hi Josh, Yes, i have a logic analyzer between MC and TRF7960, in the logic analyzer i can see the configuration register, when i send and read from the MCU, but, i can´t see the flag.
    on Dec 27, 2012

  • Forum Post: RE: RFID reader with TRF7960 and PIC24FJ128GA010

    javi garcia
    javi garcia Hola Josh, Sí, tengo un analizador lógico entre MCU y TRF7960, en el analizador de lógica que se puede ver el registro de configuración, cuando i enviar y leer desde el MCU, pero no puedo ver la bandera. All time the IRQ is high, never it is low...
    on Dec 28, 2012
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