NAC1080

NAC1080 INFINEON | Alldatasheet

Document overview

• Manufacturer or author: Provided By alldatasheet.com(free datasheet download site)
• PDF pages: 23

Technical content

User manual for NAC1080 development NAC1080 About this document Scope and purpose This document describes the evaluation kit for Infineon’s NAC1080 near-field communication (NFC) tag-side controller with the integrated H-bridge intended for passive smart lock applications. The kit has all the necessary components to enable a quick start to the development of the electrical part of a passive smart lock. Intended audience This document is intended for hardware design engineers who want to develop or improve the electrical part of smart lock systems. Table of contents UM_2112_PL39_2202_112036 User Manual Please read the sections "Important notice" and "Warnings" at the end of this document V1.0 www.infineon.com/nac1080 2022-06-23

1 Introduction

This evaluation kit is a tool for engineers who want to use NAC1080 to develop smart locks. NAC1080 is a NFC tag-side controller which combines in one device the functions of energy harvesting, NFC and motor control. NAC1080 is based on a 32-bit Arm® Cortex®-M0 processor core operating at a CPU frequency of 28 MHz. Standard peripheral modules such as UART , SPI and 32 kHz RTC are included. The development kit consists of the evaluation board EVAL_NAC1080, packages of firmware and software examples with the related documentation, two PCB antenna designs and one mini DC motor. With the QR code printed on the shipping box it is possible to register the board at www.infineon.com to get access to all related documents and code examples. The following packages will be available after the registration:

• Stand-alone motor control firmware with source code (two versions)
• Firmware development SDK (without source code)
• Mobile application development SDK for iOS and Android (without source code)
• Lock demo firmware to work with mobile demo app (two versions, binary file without source code)
• Lock demo mobile application for Android (APK file)
• PCB layout files for two different antenna designs
• Evaluation board schematic and PCB layout files The evaluation board EVAL_NAC1080 has two functional areas ‒ the NAC1080 microcontroller area and antenna area. The perforated profile is implemented on the borders of the areas, so that they can be separated from each other if needed – for instance, to test the system with other antennas. The evaluation kit can be configured for passive or active mode. User manual for NAC1080 development

User Manual 2 V1.0 2022-06-23

2 Use of the evaluation kit in passive mode

Passive mode means that NAC1080 IC does not require any external wired connected power supply and the energy needed to supply the IC can be harvested wirelessly from the NFC field generated by the NFC reader. Part of the harvested energy can be stored in the dedicated storage capacitor (C7 or C10) located on the board to enable operations with the mini motor needed for the smart lock system. The evaluation board supports testing and development of different methods to rotate the motor – simple one-step movement, one-step movement with external boost-buck or multi-step method. Table 1 shows the configuration of the board for different methods and gives a short description of each method. For more detailed information about the methods see application note NFC passive lock implementation with NAC1080. The installed firmware supports simple one-step and multi-step methods, and switching between them is available via the mobile application software. By default the firmware is configured for simple one-step movement. To use one-step movement with the external boost-buck circuit method ‒ other firmware (which is available on the Infineon webpage after the evaluation board registration) must be programmed and the jumper setting on the evaluation board needs to be changed as detailed in Table Table 1 Configuration of the evaluation board for different methods of motor rotation Method name Simple one-step movement One-step movement with external boost- buck circuit Multi-step movement Method

description

movement. Energy required to rotate the motor is stored in an external energy storage capacitor at once. Charge the external energy storage capacitor to reach the voltage clamping level first, then discharge the capacitor to rotate the motor. Connect an external energy storage capacitor to the IC VCC_HB output pin to store the harvested energy. Voltage across the capacitor is limited by NAC1080 clamping voltage: max. 3.6 V. One-step motor movement. Energy required to rotate the motor is stored in the energy storage capacitor at once. The working principle is the same as the “simple one- step movement” , but the voltage across the energy storage capacitor is increased. A sequence of a boost and a buck converter is required. Voltage across the energy storage capacitor steps up to 15 V using a discrete boost circuit. A buck converter reduces the voltage back to 3.3 V to supply the H-bridge of NAC1080. Stepwise motor movement. Energy required to rotate the motor is permanently harvested during motor movement. An energy storage capacitor is still required because the motor usually consumes more power than can be harvested at a certain point of time. This method controls the motor turn-on and turn-off operating points with the specified time interval or with the given VCC_HB voltage threshold. Voltage across the energy storage capacitor is limited by NAC1080 clamping voltage: max 3.6 V. Implemented as a number of charging- moving cycles. One cycle description: the capacitor starts to charge when the NFC energy harvesting is available and the motor is switched off. After the capacitor voltage reaches the required voltage level (VON), the H-bridge turns on and the motor starts to rotate. When the voltage drops down to VOFF, the motor is switched off. Such cycles are repeated until the required rotation angle is reached. (table continues...) User manual for NAC1080 development User Manual 3 V1.0 2022-06-23

Table 1 (continued) Configuration of the evaluation board for different methods of motor rotation Advantages and disadvantages Pros: Easy to implement, only energy storage capacitor is required. Cons: The large capacitor (several mF) might be required to reach the target rotation angle. Normally system operates only during NFC presence. To extend the operation for some time a circuit with the backup energy storage has to be implemented (see NFC passive lock implementation with NAC1080 application note). Pros: Large amount of energy is stored in high-voltage capacitor which could provide energy for multiple motor motions like 90°C forward followed by 90°C backwards motor rotation. Cons: Additional cost and space for boost and buck stages. Longer capacitor charging time. Pros: Reduced energy waste, small capacitor size can be achieved. Con: The system is functional only during NFC presence. Evaluation board configuration JP4:OFF, JP5:OFF, JP6:ON, JP7:OFF, JP13:OFF, JP14:OFF; with the backup energy storage: JP4:ON, JP5:1-2ON, JP6:OFF, JP7:OFF, JP13:OF, JP14:OFF JP4:OFF, JP5:2-3ON, JP6:OFF, JP7:ON, JP13:ON, JP14: ON; JP4:OFF, JP5:OFF, JP6:ON, JP7:OFF, JP13:OFF, JP14: OFF; The evaluation board has a general purpose LED1 connected to GPIO2, which can be used for firmware debugging purposes. The meaning of the LED1 indication for the installed firmware code example is described in chapter 12. Table 2 shows the parameters of a 3 V 60mA mini DC motor which is part of the evaluation kit. This is the OT -10GP7L geared motor from the company Once Top Motor www.oncetop.com. Table 2 Parameters of the mini DC motor Parameter Value Type DC with gear, gear ratio 1:171 Rated voltage 3.0 V DC Rotation CCW Output speed 75 ±5 RPM Nominal load current 0.02 A max. Stall current 0.26 A max. Stall torque 160 g.cm min. (table continues...) User manual for NAC1080 development User Manual 4 V1.0 2022-06-23

Table 2 (continued) Parameters of the mini DC motor Rated torque 38 ±5 g.cm Rated current 0.06 A max. Rated speed 61 ±10 percent RPM Shaft diameter 8 mm User manual for NAC1080 development User Manual 5 V1.0 2022-06-23

3 Use of the evaluation kit in active mode

Although the evaluation board is designed for passive smart lock systems it can also be used in active mode. In this case NAC1080 must be supplied from an external power supply, which must be connected to the VCC pin (pin header JP3, pins 1, 2 or 3). The VCC input voltage range is defined in Table 4. An energy storage capacitor on the VCC_HB pin is not needed. If H-bridge is used, connect the VCC_HB pin to the VCC pin; otherwise leave the VCC_HB pin open. In active mode the NFC works but the energy is normally not harvested from the NFC field. To avoid the conflict of two power sources in case of NFC field presence – the NFC field should not present at the moment when NAC1080 is powering up from VCC– that is, a reader (a cell phone) has to be removed from the antenna of the evaluation board at the moment of NAC1080 startup and in this case the IC keeps the supply status (active mode) until the next power-down cycle. Table 3 shows the configuration of jumpers on the evaluation board for active mode. Table 3 Configuration of jumpers for active mode JP4 Off JP5 2 to 3: on JP6 Off JP7 Off JP13 Off JP14 Off User manual for NAC1080 development User Manual 6 V1.0 2022-06-23

4 Photo of the evaluation board

Figure 1 Photo of the evaluation board, top view Figure 2 Photo of the evaluation board, bottom view User manual for NAC1080 development User Manual 7 V1.0 2022-06-23

5 Schematic

User manual for NAC1080 development User Manual 8 V1.0 2022-06-23

6 Layout

Figure 4 Layout, top view Figure 5 Layout, bottom view User manual for NAC1080 development User Manual 9 V1.0 2022-06-23

7 Operational conditions and parameters

Table 4 Operational conditions and parameters Parameter Symbol Min. Typ. Max. Unit Note Power supply VCC 2.8 3 3.6[*] V GPIOs as outputs, HIGH Level GPIO0 to GPIO6 2.2 2.5 V load 2 mA GPIOs as outputs, LOW Level GPIO0 to GPIO6

0.2 V load 2mA

inputs, HIGH level GPIO0 to GPIO6 1.75 3.6 V GPIOs as inputs, LOW level GPIO0 to GPIO6 0 0.7 V Wake-up threshold HIGH Level WAKEUP 2.3 V Wake-up threshold LOW Level WAKEUP 0.8 V Voltage at VCC_HB VCC_HB 3.3 V Current between MA and MB I_HB 250 mA Boost input voltage BOOST 3.3 3.6 V Buck input voltage BOBI 15 16 V Resonance capacitance between terminals LA and LB C_chip 23.5 pF Debugger target reference voltage Vtref 2.2 2.5 V [*] – the maximum external voltage should not exceed the selected clamping voltage of NAC1080 – see the datasheet for the possible values of the clamping voltage. User manual for NAC1080 development User Manual 10 V1.0 2022-06-23

8 Jumper descriptions

Table 5 Jumper descriptions JP1 MA, MB connection JP2 VCC_CB connector JP3 VCC connector JP4 Connection of backup energy storage JP5 VCC_HB pin connection JP6 Connection of storage capacitor JP7 Connection of boost-buck circuit JP8 GPIOs connection JP9 GPIOs connection JP10 SWDIO and SWDCLK connection JP11 Connection of external antenna JP12 Energy storage capacitor discharge through 1 kΩ JP13 Connection of the detection circuit JP14 Connection of the buck converter JP15 GNG connection pins JP16 Motor mount JP17 LDO input connection JP18 Debugger plug User manual for NAC1080 development User Manual 11 V1.0 2022-06-23

9 Bill of materials

Item number Part reference Value Package Comments

1 U1 NAC1080 DSO16 Infineon tag-side

2 U2 MIC5209-2.5YS SOT223 LDO with 2.5 V output

3 U3 430156070736, Würth

Through-hole General purpose button

4 U4 AP62150WU-7 or

5 C1 2.2 µF, 10%, 6.3 V 0805 VCC_CB capacitor

6 C2 0805 Not used

7 C3 0.1 µF, 10%, 6.3 V 0805 VCC capacitor 8 C4 10 µF, 10%, 6.3 V 0805 VCC capacitor

9 C5, C6 0805 Antenna tuning

capacitors, not populated 10 C7, C8 1 mF, 10%, 6.3 V Through-hole, radial, can, d = 10 mm, L = 20 mm Aluminium electrolyte, VCC_HB capacitor 11 C9 10 µF, 10%, 6.3 V 0805 Boost input capacitor

12 C10 1 mF, 10%, 25 V Through-hole,

Radial, Can, d = 10 mm, L = 20 mm Aluminium electrolyte, boost output capacitor

13 C11 10 µF, 10%, 25 V 0805 Input capacitor of the

14 C12 0.1 µF for AP62150WU-7 or 1 µF for MP1470GJ; 10%, 25 V

0805 Capacitor to form supply

15 C13 10 µF, 10%, 6.3 V 0805 Output capacitor of the buck converter 16 C14 22 nF, 10%, 6.3 V 0805 High-frequency filtering capacitor 17 C15, C17 0.1 µF,10%, 6.3 V 0805 LDO capacitors 18 C16 22 µF, 10%, 6.3 V 0805 LDO capacitors

19 R1 330 Ω, 5% 0805 Sets the current through

20 R2 1 kΩ, 5% 0805 Resistor to discharge

21 R3 100 kΩ, 5% 0805 Pull-up resistor

22 R4 10 Ω, 5% 0805

(table continues...) User manual for NAC1080 development User Manual 12 V1.0 2022-06-23

Table 6 (continued) Bill of materials

23 R5 100 kΩ, 5% 0805 Pull-down resistor, not

24 R6, R7 100 kΩ, 5% 0805 Resistors to setup bias

25 R8 0 Ω 0805 Can be used as an

for GPIO3. If not used as a pull-up then 0 Ω has to be populated

26 R9 75 kΩ, 1% – for MP1470GJ,

0 Ohm – for AP62150WU-7

0805 Resistor of the feedback

27 R10 31.6 kΩ, 1% – for AP62150WU-7 or 40.2 kΩ, 1% – for MP1470GJ

28 R11 10 kΩ, 1% – for

AP62150WU-7 or 13 kΩ, 1% for MP1470GJ

29 R12, R13 47 Ω, 5% 0805 Line termination resistors

30 R14, R15, R16 100 kΩ, 5% 0805 Pull-up resistors for SWD

31 R17 0 Ω 0805 Debugger resistor

32 R18 100 kΩ, 5% 0805 Pull-down resistor

33 R19 0 Ω 0805 Jumper resistor for buck

34 L1 100uH; L1007C101MDWIT

1007 Inductor of the boost

35 L2 4.7uH; CBC2518T4R7M 1007 Inductor of the buck converter

36 DZ1 BZX84B16-HE3-08 SOT23-3 Zener diode

37 DZ2 BZX84B11-HE3-08 SOT23-3 Zener diode

38 DS1 BAS40-04T-7-F SOT23-3 Schottky diode

39 DS2 BAS40-04T-7-F SOT23-3 Schottky diode

40 Q1 IRLML6244TRPBFor

41 Q2 AS9013 SOT23-3 NPN transistor for the

42 LED1 APTD1608LSECK/J4-PF 0603 General purpose orange

(table continues...) User manual for NAC1080 development User Manual 13 V1.0 2022-06-23

Table 6 (continued) Bill of materials

43 JP1-JP10, JP12-

JP15, JP17 2.54 mm pitch, TSW-10X-14-G-S; 1-pin - 2 pcs., 2-pin - 6 pcs., 3-pin - 3 pcs., 4-pin - 3 pcs., 6-pin - 1 pc. Through-hole Connectors pin headers vertical 44 JP11 2.54 mm pitch, TSW-102-25-G-S-RA, not populated Through-hole, angled Connector for antenna

45 JP16 not populated Through-hole Motor mount area

46 JP18 FTSH-105-01-L-DV-K-TR SMD Connector for the

47 JP19 1SH-A-02-TR-SMT SMD Connector for the mini-

48 2.54 mm pitch; QPC02SXGN-RC Jumpers for the board configuration User manual for NAC1080 development User Manual 14 V1.0 2022-06-23

10 NFC antenna

The evaluation kit offers one antenna as part of the evaluation board and two antenna designs (PCB layouts) which can be directly manufactured from the available Gerber files. The description of the antennas as well as the Gerber files can be downloaded after evaluation board registration. The guidelines for the antenna design are given in the application note for NLM0011 here. NFC readers operate in the 13.56 MHz high-frequency band. The typical value of the internal capacity between terminals LA and LB of NAC1080 is given in the datasheet and it is 23.5 pF. For the antenna tuning (if necessary) capacitors C5 and C6 are laid out on the evaluation board (by default not populated). User manual for NAC1080 development User Manual 15 V1.0 2022-06-23

11 Debugger connection

NAC1080 IC supportsArm® SWD and TAG debug ports for the firmware programming. Figure 6 shows the connection of the debugger to the device. Two signals of the SWD debug port - SWDCLK and SWDIO - are connected with the pull-up resistors of 100 kΩ. Series termination resistors of 47 Ω on the SWCLK and SWDIO lines are recommended. The system must be supplied from an external power supply of 3.0 V to 3.3 V; that is, it must be in active mode (see Table 3 for jumper configurations). Connect external power supply (3 V to 3.3 V) device have a “HIGH” level (2.2 V to 2.5 V) instead of the 3 V range, a low-dropout (LDO) regulator with the 2.5 V output is used to generate the required level for the VTref signal of the debugger. 9-pin debugger SWD/JTAG pinout is shown in Figure 7 . As a debugger tool micro Trace for Cortex-M from Lauterbach or Segger J-LINK JTAG debuggers can be used (Figure 8). Both debuggers have a 20-pin header, therefore an adapter for 20 pin to 10 pin is required. Please be aware that a debugger is not included in the development kit and must be ordered separately. Figure 6 Part of the circuit showing the debugger connection Figure 7 SWD/JTAG 9-pin connector User manual for NAC1080 development User Manual 16 V1.0 2022-06-23

Figure 8 J-Link debugger connected to the evaluation board User manual for NAC1080 development User Manual 17 V1.0 2022-06-23

12 Mobile application software

The mobile application software is designed to support the remote control of the smart lock system under development. The software can work together with the available firmware demo example developed for the three different methods of motor rotation described in Chapter 2. The mobile application software is available for iOS and Android operating systems. To install the mobile application on an Android cell phone, copy the file to the Application folder of the cell phone, then go to Installation packages and install the application. For some Android versions it is necessary to permit the installation – this can be done in the system Settings --> Applications. NFC has to be switched on on the cell phone (system Settings --> device connectivity or wireless & networks). To install the application on an iPhone an internet connection is necessary. Access to the application can be done either via QR code or via the direct link given in the development kit software package. After the installation of the mobile application is finished the permission has to be set: system Settings-->General-- >Device management-->x-root Software. For both Android and iOS, after the installation it is necessary to accept the terms of service. Figure 9 shows the GUI of the mobile application software. After running the software you will see the Home and Locks menus at the bottom of the screen. The first time you connect a mobile app with the evaluation board, the mobile app will identify the presence of an unknown lock. It will redirect to “setup new lock” to ask for product registration (Figure 9(a)). The registration can also be started by selecting Setup in the top-right corner. During the registration the supervisor key must be entered. For the available firmware demo code the supervisor key is: 0123456789abcdef . For the real locks in production it is assumed that such a supervisor key is unique and is provided together with every lock in the package, or will be available through the online registration. After the registration is finished the new registered lock will be displayed in the Locks (Figure 9(b)) tab. The Locks tab shows all the registered keys on the cell phone and allows the user to manage the keys: edit, share or delete. To control the lock from the application software, the Home tab (Figure 9(c)) has to be used. In the Home tab “Lock” and “Unlock” buttons activate the following flow: initiate the information exchange via NFC between the reader (smartphone) and NAC1080, wait for the energy storage capacitor charge and then send the command to rotate the motor (Lock – forward direction, Unlock – reverse direction). The round diagram shows the current status (Figure 10 and Figure 11). If the communication between the reader and NAC1080 is stable and the sequence is completed the diagram shows the status “Succeeded” . If the communication was interrupted then the diagram shows the status “Failed” and the operation has to be repeated by pressing the “Lock” or “Unlock” button on iOS smartphones, or it will be repeated automatically (without pressing any buttons) on Android smartphones. LED1 on the evaluation board indicates the NFC between the reader and NAC1080. Please note that the indication works differently for iOS and Android. For iOS the NFC can be established only after “Lock” or “Unlock” button is pressed. For Android the NFC communication can be established without pressing any buttons. The following LED1 indications can be distinguished:

• LED1 is permanently on: the NFC between NAC1080 and the mobile application software is established and running.
• LED1 is blinking: H-bridge is active (mini DC motor is rotating if connected) during the established NFC between NAC1080 and the mobile application software. User manual for NAC1080 development

User Manual 18 V1.0 2022-06-23

Figure 9 Graphical user interface of the mobile application software User manual for NAC1080 development User Manual 19 V1.0 2022-06-23

Figure 10 Different communication statuses between the NAC1080 and the mobile application software (example shown in iOS) User manual for NAC1080 development User Manual 20 V1.0 2022-06-23

Figure 11 Different communication statuses between the NAC1080 and the mobile application software (example shown in Android) User manual for NAC1080 development User Manual 21 V1.0 2022-06-23

Revision history

V1.0 2022-06-23 first release User manual for NAC1080 development User Manual 22 V1.0 2022-06-23

All referenced product or service names and trademarks are the property of their respective owners. Edition 2022-06-23 Published by Infineon Technologies AG

81726 Munich, Germany

© 2022 Infineon Technologies AG All Rights Reserved. Do you have a question about any aspect of this document? Email: erratum@infineon.com Document reference IFX-ryf1640080869878 Important notice The information given in this document shall in no event be regarded as a guarantee of conditions or characteristics (“Beschaffenheitsgarantie”). With respect to any examples, hints or any typical values stated herein and/or any information regarding the application of the product, Infineon Technologies hereby disclaims any and all warranties and liabilities of any kind, including without limitation warranties of non-infringement of intellectual property rights of any third party. In addition, any information given in this document is subject to customer’s compliance with its obligations stated in this document and any applicable legal requirements, norms and standards concerning customer’s products and any use of the product of Infineon Technologies in customer’s applications. The data contained in this document is exclusively intended for technically trained staff. It is the responsibility of customer’s technical departments to evaluate the suitability of the product for the intended application and the completeness of the product information given in this document with respect to such application. Warnings Due to technical requirements products may contain dangerous substances. For information on the types in question please contact your nearest Infineon Technologies office. Except as otherwise explicitly approved by Infineon Technologies in a written document signed by authorized representatives of Infineon Technologies, Infineon Technologies’ products may not be used in any applications where a failure of the product or any consequences of the use thereof can reasonably be expected to result in personal injury.