NXP Semiconductors
AN11744
PN5180 Evaluation board quick start guide
AN11744 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2018. All rights reserved.
Application note Rev. 1.3 — 2 February 2018
COMPANY PUBLIC 371213 10 / 45
The symmetrical tuning (see Fig 8) improves the transfer function compared to the
standard “asymmetrical” tuning and thus allows to use a higher system Q factor, which
results in a higher field strength. The disadvantage of the loading effect, which causes
an increased current ITVDD, is compensated with the PN5180 Dynamic Power Control
(DPC, for details refer to [4]).
1. Including 10Ω between ANT1 and ANT2
Figure 8. PN5180 evaluation board antenna tuning
2.3 Jumper settings
Three jumpers can be used to evaluate the different power supply options:
J101: either external or USB power supply (default)
J303: either VBAT = 5V or 3.3V (default)
J300: closed (default) or to measure the ITVDD
Fig 9 shows the default jumper settings for operation powered via USB.
Fig 10 shows the jumper setting for the operation externally powered.
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