Microchip ATMXT640UD Handleiding

Microchip Niet gecategoriseerd 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

AN4654

DS00004864A-page 2  2023 Microchip Technology Inc. and its subsidiaries

2.0 PUBLIC/COMMERCIAL EV CHARGER: EXAMPLE OF REFERENCE

ARCHITECTURE BLOCK

Microchip offers a variety of solutions for EV charger designs, including those incorporating payment terminal systems.

Microchip’s value-added proposition is described in Figure 1.

FIGURE 1: EV CHARGER REFERENCE ARCHITECTURE

The blue boxes in Figure 1 show the technology areas addressed by Microchip products. As can be seen, Microchip is

able to offer almost a complete solution for this architecture.

User Interface

Microchip offers a wide range of Touch and Gesture solutions, from microcontrollers with software touch libraries

through to high end maXTouch® dedicated high performance capacitive touch controllers. The maXTouch portfolio

can solve complex system problems with its dedicated analog hardware and integrated proprietary firmware that can

be configured for any end user application.

The maXTouch touchscreen controllers use unique and patented sensing algorithms for robust and reliable multi-

finger touch operation in the most challenging environments. With excellent immunity to water and electromagnetic

noise and the ability to detect touch through thick gloves and thick front panels, these touchscreen controllers are

well suited for touch-enabled Human-Machine Interfaces (HMIs) in automotive, home appliance, point-of-sale,

medical and industrial applications.

For more information on the maXTouch touchscreen controllers, visit www.maxtouch.com.

Touchscreen

8/16/32-bit MCU

32-bit MPU

(including SW/OS)

Auxiliary Power

Supply

Power Monitor

I/V Sense

DC-DC

Buck

Converter

PMIC

Temperature

Sensor

Memory Security

Clock

Relay/

SSCB (E-Fuse)

CAN

HomePlug

OpAmp

Wi-Fi

Bluetooth

Ethernet

USB

4G/5G

LDOs

maXTouch

Touch

Controller

12V

120V / 240V / 400V AC (1ph...3ph)

3.3V

2.5V

1.8V

1.25V

3.3V

2.5V

1.8V

1.25V

User Interface

AN4654

 2023 Microchip Technology Inc. and its subsidiaries DS00004864A-page 3

One such example is mXT336UD-MAU002. This device can be used with display sizes up to 7 inch in POS

terminals and similar applications, such as EV charger systems. It supports encryption of messages sent through an

I2C interface, and the encryption of configuration data for secure applications. The controller also incorporates a new

self-test and sensor diagnostic function, which constantly monitors the integrity of the touch system. This real-time

diagnostic function reports early touch sub-system failures to the host MPU so that it can display an error message

on the terminal. This allows the terminal vendor to replace or repair the hardware, even before the user becomes

aware of many types of failure modes.

Other examples include the mXT640UD which is aimed at display sizes up to 10 inches and the mXT1066TD (up to

13in diagonal). Having an on-chip tripler boost circuit allows these parts to meet 10 Vrms conducted noise immunity

(per IEC61000-4-6). Proprietary differential touch sensing available in all TD/UD series products delivers

unparalleled noise immunity ensuring superior touch performance even in harsh environments. This high SNR

combined with a high acquisition speed provides a fast, accurate and reliable a touch position.

For more information, visit the following:

https://www.microchip.com/en-us/product/ATMXT336UD

https://www.microchip.com/en-us/product/ATMXT640UD

https://www.microchip.com/en-us/product/ATMXT1066TD

CPU

For over 30 years, microcontrollers have been at the heart of Microchip’s product portfolio. Depending on the overall

system requirements, and whether the device will use an embedded OS or be Linux

® based, a 32-bit MCU or an

MPU may be the best fit. Microchip’s broad portfolio ensures that you can find a device well-suited to your needs,

with flexible growth potential for future enhancements and strong tool support.

For more information, visit the following:

https://www.microchip.com/en-us/products/microcontrollers-and-microprocessors/32-bit-mcus

https://www.microchip.com/en-us/products/microcontrollers-and-microprocessors/32-bit-mpus

Secure Serial Quad IO Flash

For MPU-based systems using off-chip memory, devices such as the SST26VF064B may be used: a Serial Quad I/

O (SQI) flash device offering a 4-bit multiplexed I/O serial interface to boost performance while maintaining the

compact form factor of standard serial flash devices.

For more information on the SST26VF064B, visit the following:

https://www.microchip.com/en-us/product/SST26VF064B

Security

“Security is no longer an option; it’s a requirement” is the current mantra. Whether concerned about hacking attacks,

user authentication or payment confidentiality, security is a prime consideration for modern EV charger designs.

Depending on overall system requirements, this can be implemented as an embedded block in an MCU/MPU,

offering a Trusted Execution Environment (TEE), or as a separate “Root of trust” device.

For more information, visit the following:

https://www.microchip.com/en-us/products/security

Connectivity

Depending on the overall design, a wide variety of wired and wireless connectivity may be needed, and Microchip is

well-placed to support your needs with a broad offering such as:

-Wireless: Microchip offers a wide range of wireless connectivity solutions. One example is ATWILC1000 - a

single chip IEEE 802.11 b/g/n RF/Baseband/MAC link controller. The similar ATWILC3000 adds Bluetooth 5.

Both these modules connect to Microchip AVR/SMART MCUs, SMART MPUs, and other processors with

minimal resource requirements using a simple SPI/SDIO-to-Wi-Fi and UART-to-Bluetooth interface.

For more information, visit the following:

https://www.microchip.com/en-us/products/wireless-connectivity/embedded-wi-fi

Product specificaties

Merk:	Microchip
Categorie:	Niet gecategoriseerd
Model:	ATMXT640UD

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