NXP Semiconductors
AN13134
PN76 family evaluation board quick start guide
1 Introduction
This document describes the usage of the PN76 family evaluation board, which provides an easy evaluation of
the features and functions of the PN76 family.
It provides the first steps to operate the board and the setup of the development environment.
The default antenna is a 45 mm x 45 mm antenna with some metal layer inside the antenna area. This antenna
is not an optimum antenna as such, but intends to demonstrate the performance and register settings of the
PN76 family under typical design constraints like LCD or some metal (e.g., PCB) inside the antenna area. The
default settings provide an EMVC0 3.0 L1 analog compliance under the assumption that the antenna surface is
a few mm above the antenna PCP.
1.1 PN76 family registers and EEPROM concept
The PN76 family uses internal registers to adapt and optimize the functionality and performance for each of the
supported protocols and data rates dependent on the connected antenna, matching network and receiver path.
It offers an EEPROM, which contains the default settings for all the supported protocols. These settings are
loaded into the registers with the PN76_Sys_LoadRfConfiguration(…) method for each supported protocol and
data rate.
The default EEPROM configuration settings are optimized for the 45 mm x 45 mm antenna of the board RF
performance board and can be changed by the user in case a customized antenna and matching network is
used. The load RF configuration method allows to initialize multiple registers with an efficient single API call
and allows to distinguish between transmit and receive configuration. Update of the registers relevant for a
selected protocol is done by copying the content of EEPROM addresses to registers. Not all protocols require
the initialization of all or the same registers, the PN76_Sys_LoadRfConfiguration(…) considers this.
Some of these settings can or even must be adapted toward a new antenna design (e.g. the dynamic power
control). All those design-specific settings should be stored in the PN76 family EEPROM to allow a proper
functionality.
Some EEPROM configuration data is independent from the used protocols and defines e.g. the startup behavior
of the PN76 family or the functionality of low-power card detection (LPCD). This configuration data might also
be adapted for optimum performance of the chip.
AN13134 All information provided in this document is subject to legal disclaimers. © 2023 NXP B.V. All rights reserved.
Application note Rev. 2.5 — 2 May 2023
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