I can't make PN7150 recognize card 2cm or more(between PN7150 and card).

[馬場重人]

I can't make PN7150 recognize card 2cm or more(between PN7150 and card).

I'm sorry my poor English. I'm Japanese.

2cm or less OK. but 2cm or more is NG.

Why I Can't?

If I need adjust settings, please teach me.

(RX_GAIN? or something else?)

Best regard.

[Jonathan_Iglesias]

Dear 馬場 重人,

hope you are doing great, I would like to know if you are using our evaluation board or if you are using your custome  board.

BR

Jonathan

[馬場重人]

Mr. Jonathan Iglesias

Thank you for your reply.

I have used PN7150 SBC KIT FOR RASPBERRY PI OM5578/PN7150RPI.

I had used DC-DC converter for 3.3V power, It is not good.

But I changed form DC-DC converter to low dropout voltage regulator for 3.3V, It is good.

DC-DC converter:TI TPS54331
low dropout voltage regulator:JRC NJM2830

Is Low dropout voltage regulator better than DC-DC converter to supply PN7150?

Best regard.

[weidong_sun · Accepted solution]

Hello 馬場 重人,

   Generally speaking, the effective range is 1cm~3cm when NFC reader reading a Tag, so I feel 2cm should be OK.

In additon, probably using LDO should be better than DC-DC converter.

Have a great day,
TIC  weidong

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[馬場重人]

Mr. Wigros Sun

Thank you for your reply.
I will use that as reference from now on.