NXP Semiconductors OM27642 Manuel utilisateur

UM11038

OM27642 Smart Lock KIT

Rev. 1.1 — 11 October 2018

407611

User manual

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OM27462NBR Smart Lock KIT User manual

Abstract

This document describes the content, the hardware implementation and

the usage of the Android application as well as the access token structure

and processing of the NFC Bluetooth®Low Energy Smart Lock KIT -

OM27462NBR. It also describes how to update the QN9021 and PN7462

firmware.

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Contact information

For more information, please visit:

http://www.nxp.com

Revision history

Rev

Date

Description

1.1

20181011

•Fig. 14 updated

•Editorial updates

1.0

20161116

First release

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1. Introduction

This document describes the implementation of a battery-operated Bluetooth®Low Energy NFC

Smart Lock for the hospitality market. This document does not replace the PN7462AU or QN9021

datasheets and respective application notes. Please refer to the datasheets for detailed information

of the ICs. This document also describes the process of firmware upgrade for both the PN7462 and

QN9021 (QS9322 module) as well as for the implemented demonstration functionality.

The Smart Lock KIT hardware design consists of two PCBs and incorporate the following

main IC components:

•PN7462AU – all-in-one full NFC application controller with freely programmable

µController

(PN from now on)

•QN9020 – for Bluetooth Low Energy communication (QN from now on)

•PCF8883T – for capacitive wake up of the application processor circuitry

(PN7x62)

•NX5P2553 - precision adjustable current-limited power switch

The PN and the QN ICs communicate with each other by means of serial communication

over a UART interface.

Each of the micro-controllers contains its own firmware which performs the required

actions depending on the origin of the unlock token. The token can be delivered to the

lock in two ways:

•over RFID – with the help of an MIFARE DESFire ISO14443 Type A card or via

an Android based phone using HCE.

•over Bluetooth Low Energy – with help of any Bluetooth Low Energy compliant

device

In this document the term „MIFARE DESFire card“ refers to a MIFARE DESFire IC-

based contactless card.

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2. Smart Lock KIT Package Content

Fig 1. OM27462NBR Smart Lock module, power cable, programming cable, touch sensor plate,

set of demonstration cards

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3. Smart Lock Module Hardware

The core module – stack on board contains all necessary blocking capacitors, XTAL, 2

status LEDs and the antenna EMC filter.

The Core module is designed for general purpose use therefore all power supply options

(e.g. internal/external LDO etc.) are configured on the base board. The core Module /

stack on approach was taken in order to create a high density low PCB area

implementation.

Fig 2. OM27462NBR Smart Lock module consisting of PN7462AU core module V1.2 and the 40mm Ø

base board NFC- Bluetooth Low Energy Smart Lock V1.1

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3.1 Smart lock system block diagram

Fig 3. Main building blocks

Fig 4. OM27462NBR NFC- Bluetooth Low Energy Module with PN7462 stack on core module

Figure 4 shows the functional block diagram of the Smart Lock module including the

main components used.

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4. Schematics

Fig 5. Base board schematic part 1

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4.1 Base board schematics continued

Fig 6. Base board schematic part 2

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4.2 Core Module schematics

Fig 7. Core Module pin out vs. PN7462AU pin out

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4.3 Antenna matching

The antenna matching of the Smart Lock main PCB is shown below. The EMC filter is

part of the stack-on core Module. The base board consists of the matching circuit with

the damping resistors and the serial and parallel matching capacitors.

Fig 8. Antenna matching on stack on Core Module

Fig 9. Antenna matching components on the base board

Please Note: high resolution schematics are available as PDF files in the download

section under manufacturing data here: www.nxp.com/demoboard/OM27462NBR

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