NXP Semiconductors
AN12550
PNEV5190B evaluation board quick start guide
2 Introduction
This document describes the PNEV5190B (PN5190 evaluation board), which provides an
easy evaluation of the features and functions of the PN5190.
It provides the first steps to operate the board, using the NFC Cockpit (PN5190 GUI
Version 5.5.0 or higher).
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 PN5190 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.
2.1 PN5190 registers and EEPROM concept
The PN5190 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 LOAD_RF_CONFIGURATION (0Dh) command 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 PNEV5190B and can be changed by the user in case a customized
antenna and matching network is used. The command LOAD_RF_CONFIGURATION
allows initializing multiple registers with an efficient single command and allows
distinguishing 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
command LOAD_RF_ CONFIGURATION considers this by initializing the registers
relevant for the currently selected protocol only.
The EEPROM content can be updated using the command
UPDATE_RF_CONFIGURATION (0Eh). The command does not require any physical
EEPROM address, but works directly with the register address information and the
protocol for which this data is intended to be used. This allows a convenient initialization
of all relevant values for operation.
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
PN5190 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 PN5190 or the functionality of low-power card detection
(LPCD). This configuration data might also be adapted for optimum performance of the
chip.
2.2 PNEV5190B concept
The basic
concept of the PNEV5190B
is to enable the user to perform a quick
evaluation of the PN5190 and also connect their own antenna to the PNEV5190B
board. In addition, dedicated boards which allow to solder custom antenna matching
components are available. The NFC Cockpit can be used to optimize the RF
AN12550
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2021. All rights reserved.
Application note
Rev. 1.5 — 23 April 2021
COMPANY PUBLIC
562315
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