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TRF7964A: IRQ - No response time interrupt sometimes works and sometimes doesn't

Scott Bouphasavanh
Prodigy 20 points
Part Number: TRF7964A
Other Parts Discussed in Thread: DLP-7970ABP

I've been developing my firmware using the DLP-7970ABP development board and got the ISO15693 Anti-Collision Algorithm with No response time interrupt working. I've transferred the firmware to a prototype board that's using the TRF7964A chip and I'm encountering problems with no response time interrupt sometime stopping working. I'm using one tag in the field for testing. It tends to happen after the chip encounters a tag in the slot: I get an IRQ that RX start, check how many bytes are in the buffer, retrieve the data, then send the commands to block the receiver (0x16), Enable the receiver (0x17), and send the next slot (0x14). Like I said, it sometimes works the way I expect it to and cycles through all the slots and retrieving the one tag in the field, but when it doesn't work, I don't receive a "No response time" interrupt after reading the tag.  Any help is appreciated.

Thank you,

Scott

  • 0
    TI__Mastermind 23180 points

    Hello Customer, thank you for your question and interest in our products.

    The forum support of this product has been reduced to first reference our existing documentation and collateral. TI does not have plans to stop production or place the device into a “Not Recommended for New Design” status, we genuinely feel most questions on these devices can be answered by reviewing existing collateral and previous questions asked. Please feel free to continue to use this device as you see fit for your applications. For support, please take a look to the “Similar Topics” section at the lower right of the thread page. In addition, please consult the existing collateral in the “Technical Documentation” section of the TRF7964A product web page along with the Frequently Asked Question document. Alternatively, you can use the search engine of your choice to look for related E2E threads. With each of these resources we believe it will help with your question.