TRF7970A: Whether TRF7970 can communicate with the MCU to notify that the existence of the RF card is detected by means of an interrupt. instead of detecting via SPI polling？

Harry Ma

Part Number: TRF7970A

Hi Team

Whether TRF7970 can communicate with the MCU to notify that the existence of the RF card is detected by means of an interrupt. instead of detecting via SPI polling？

over 3 years ago

0 Andreas Mueller over 3 years ago

TI__Mastermind 23940 points

Hello Harry,

yes, that's the purpose of the IRQ pin (pin 13). Please find more details in the datasheet (https://www.ti.com/lit/gpn/trf7970a).

Best regards,

Andreas.

0 Andreas Mueller over 3 years ago

TI__Mastermind 23940 points

Hello Harry,

I just noticed that I probably misunderstood your question, as I was assuming you mean an interrupt during MCU to TRF7970A communication.

The application firmware on the MCU of cause has to trigger the card presence detection by polling.

There is an application note for optimizing low power aspects: https://www.ti.com/lit/pdf/sloa184

Best regards,

Andreas.

+1 Andreas Mueller over 3 years ago

TI__Mastermind 23940 points

Hi,

There was no feedback since a while, so I assume this tread is resolved and can be closed. You can still reply to this thread after it is closed, or you can create a new thread.

Best Regards,
Andreas.

0 Harry Ma over 3 years ago in reply to Andreas Mueller

TI__Intellectual 2690 points

Hi Team

Sorry for it. it has been solved, Thanks for you strong support!

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TRF7970A: Whether TRF7970 can communicate with the MCU to notify that the existence of the RF card is detected by means of an interrupt. instead of detecting via SPI polling？