NFC中的主题 Re: PN7160/PN7161 DPC Symmetric Tuning Values

PN7160/PN7161 DPC Symmetric Tuning Values

joshgott — Wed, 31 Jul 2024 19:59:28 GMT

For the PN7160 and PN7161, NXP recommends the following: "To use symmetrical tuning function + Dynamic Power Control (DPC), target the target impedance 16R for V_TVDD = 5V, and 11R for V_TVDD=3.3V respectively." Does NXP have target impedance values for V_TVDD values between 3.3V and 5V? For example, if I wanted V_TVDD=4V, what should I set my target impedance to be? A look up table or something similar would be much appreciated.

Re: PN7160/PN7161 DPC Symmetric Tuning Values

Tomas_Parizek — Thu, 01 Aug 2024 06:44:30 GMT

Hello joshgott,

See the excel calculator in the attachment. Based on the inputs values (VDD voltage and complex impedance), you can calculate the expected TVDD current.

See an example below.

For V_TVDD=4V, and target impedance (14-1i) Ohm. The target current would be approx. 220 mA .

Tomas_Parizek_0-1722494318266.png

Please note that this calculation is a bit simplified. So if possible, we recommend to measure the current after the impedance tuning.

Tomas