Microchip ATMXT640UD Manual

Microchip Ikke kategoriseret ATMXT640UD

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 2023 Microchip Technology Inc. and its subsidiaries DS00004864A-page 1

1.0 Introduction ................................................................................................................................................................. 1

2.0 Public/Commercial EV charger: Example of Reference Architecture Block ............................................................... 2

2.1 maXTouch – Value proposition for Touch display ............................................................................................ 4

2.2 Encryption ......................................................................................................................................................... 5

2.3 Environmental Requirements ........................................................................................................................... 6

2.3.1 High-brightness, Rugged displays ........................................................................................................ 6

2.3.2 Thick cover glass .................................................................................................................................. 6

2.3.3 Moisture performance ........................................................................................................................... 6

2.3.4 Electrical noise ..................................................................................................................................... 6

2.3.5 NFC Antenna Display Integration ......................................................................................................... 6

3.0 Conclusion ................................................................................................................................................................... 6

Appendix A. References ....................................................................................................................................................... 7

Appendix B. Glossary ........................................................................................................................................................... 7

Appendix C. Revision History ............................................................................................................................................... 8

1.0 INTRODUCTION

The world of road transport is changing rapidly. With governments around the world facing rising concern about

pollution, as well as the impact of greenhouse gases on global warming, there are many initiatives aimed at moving road

transport away from fossil fuels to alternative technologies. And while several competing technologies are waiting in the

wings for full commercialization, it is clear that the initial change will be led by battery-based designs, whether

implemented as pure electric vehicles (BEV – Battery Electric) or hybrid vehicles (PHEV – Plug-in Hybrid Electric).

In the UK, for example, sales of non-hybrid diesel and petrol-engined vehicles will be banned after 2030

[1]. In Norway[2]

and China[3]

, as well as most of Europe[4], sales of BEVs have leapt due to generous tax concessions. In many

countries[5] BEVs are exempt from local taxes, such as congestion charging schemes,

[6] to encourage their use as non-

polluting transport options.

The common requirement which BEVs and PHEVs share is the need for points to recharge the batteries, be that at the

owner’s home, place of work, or in public places.

Domestic units can be as simple as a wall box that does little more than provide an AC power output with the required

Type 2/CHAdeMo connection, or may be web-connected, app-enabled devices capable of supplying 7 kW with load

demand control and even the ability to use the vehicle battery as a battery storage solution, re-exporting power to the

electricity grid at times of high demand. Public units, however, have the additional need for user authentication

(workplace solutions generally fall under the “public” category, unless situated in an access-controlled parking garage).

This may be simply to ensure that only authorized users can access the charger, or can be intended to provide some

variation on a pay-per-use model.

Therefore, while domestic chargers will generally only have a simple display, or indeed may have no display at all,

merely a couple of LEDs, units for public use tend to have a more sophisticated user interface. Touchscreen displays

are very prevalent in these units and, depending on the design, may be used for payment purposes as well as unit

control. This means they fall into the category of Unattended Payment Terminals (UPT), and therefore require PCI

compliance, as well as the more general requirements to withstand harsh environmental conditions and vandal-type

attacks[7]. Typically this necessitates vandal-resistant ruggedized PIN pads and high-impact sledgehammer-proof

glass. Additionally, as the charger infrastructure grows, older charger stations being retrofitted with touch-enabled

payment facilities.

Specifications for terminals with rugged touch displays are challenging and require detailed design in conjunction with

a knowledgeable and skilled supplier, rather than simply purchasing and installing an “off-the-shelf” generic module.

AN4864

White Paper: Electric Vehicle Charger

Application and Reference Architecture

Produkt Specifikationer

Mærke:	Microchip
Kategori:	Ikke kategoriseret
Model:	ATMXT640UD

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