topic Re: Operational State definition - AN12380 in NFC

Operational State definition - AN12380

StatBen — Thu, 13 Oct 2022 22:01:31 GMT

In AN12380-2.1.2 (page 5) the capacitance value is specified for the ntag5 ICs. This value is specified with an operational state.

What would be the definition of operational state in this context?

Thanks

Re: Operational State definition - AN12380

KaiLi — Mon, 17 Oct 2022 08:43:53 GMT

Hello @StatBen

you can use NFC Antenna Tool of NXP to design your application, below is the link:

NFC - NXP Community

For operational state, I understand which is your application conditions, such as the size of the antenna, the contactless distance, etc.

Thanks & Best Regards,

kelly

Re: Operational State definition - AN12380

StatBen — Mon, 17 Oct 2022 14:26:18 GMT

Thanks @KaiLi

I know about the NFC Antenna tool, but the question here is more about the specific capacitance value according to "operational conditions" here, does operational conditions means the core(digital control unit) is powered or just the rf interface? What were the tests conditions to get that value?

Re: Operational State definition - AN12380

KaiLi — Tue, 18 Oct 2022 07:30:41 GMT

Hello @StatBen

There is such a description at the bottom of the fourth page of AN12380, the input capacitance depends on the applied chip voltage. So, specifies the operational state should be the voltage Vla-lb.

Thanks & Best Regards,

kelly

Re: Operational State definition - AN12380

KaiLi — Tue, 18 Oct 2022 07:50:35 GMT

Hello @StatBen ,

according to Table 1 on page 5 of AN12380, specifies the operational state should be the constant voltage, resonance frequency and ambient temperature.

Best Regards,

kelly

Re: Operational State definition - AN12380

StatBen — Tue, 18 Oct 2022 17:02:52 GMT

Hi Kelly @KaiLi ,

Thanks, I was wondering in that test case if VCC and Vout were shorted together for energy harvesting and/or if VCC was powered at all.

Thanks,
Benoit

Re: Operational State definition - AN12380

KaiLi — Wed, 19 Oct 2022 08:37:39 GMT

Hello @StatBen ,

I think AN12365 might be helpful to you.

thanks for your cooperation

kind Regards,

kelly