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TRF7970A: Sometime can not read the ISO15693 tag

Part Number: TRF7970A
Other Parts Discussed in Thread: TRF7962A

Dear Ti support

background:
I apply the reader in factory assembly line. When the assembly line working, the 15693 tag will follow the line pass the antennas, so reader can read the tag.

Issue 1:
While assembly working, my reader sometime cannot read the tag, but MCU can work normally. When I reset the reader, it can work again. So I set a soft reset to TRF7970A in each time the reader read the tag  to reduce the problem, but I still want to know the reason about it.

Issue 2:
After setting soft reset, it still miss reading some tag. For example, there are 5 tag (ABCDE), the read will only read 4 tag (ABDE), but C can be read on other reader. And this issue appear irregulartly, maybe one day miss over 30 tags(there are nearly 1500 tag one day ), maybe one week work normally.

Although setting soft reset to TRF7970A, something time still happen missing reading tag in some time(for example,reader missing reading from 11 am to 12 am, and continue reading after 12am)

Change the RF chip:

I try TRF7962A at first, and now using TRF7970A to reduce the issue2. So I want to know should I change the code as well? It seems work normally.

Hope can reply those issues.

Thank.

  • 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 TRF7970A 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.