NXP Semiconductors MIFARE SAM AV3 User manual

UM11316
MIFARE SAM AV3 evaluation board
Rev. 1.1 — 12 March 2020 User manual
586311 COMPANY PUBLIC
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Keywords MIFARE SAM AV3, demo board, LPC, X-mode, S-mode, I2C, SPI, CLRC663
Abstract This manual shows how to operate the MIFARE SAM AV3 demo board, how
to jumper the interfaces and how to use the demo board with all different
mode configurations of MIFARE SAM AV3

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MIFARE SAM AV3 evaluation board
UM11316 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2020. All rights reserved.
User manual Rev. 1.1 — 12 March 2020
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Revision history
Rev Date Description
1.1 20200312 Added section about use with RFIDDiscover, added known Limitations, corrected typos
1.0 20200108 Initial version

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MIFARE SAM AV3 evaluation board
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1 Introduction
Figure 1. MIFARE SAM AV3 evaluation board
The MIFARE SAM AV3 offers various different modes of operation, interfaces and other
configuration settings. The MIFARE SAM AV3 evaluation board shall help to evaluate
these modes all on a single Arduino shield shaped board, in combination with any MCU.
Additionally, the board features a CLRC663 NFC frontend for quick and easy design
development and evaluation.
1.1 Scope
The scope of this document is to give an overview of all interfacing options, jumper
settings and usage possibilities that the MIFARE SAM AV3 evaluation board offers.
1.2 Abbreviations
Table 1. Abbreviations
I2C Inter-Integrated Circuit
MCU Microcontroller Unit
NFC Near Field Communication
PCB Printed-Circuit Board
SAM Secure Access Module
SPI Serial Peripheral Interface
USB Universal Serial Bus

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MIFARE SAM AV3 evaluation board
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2 Schematics
2.1 Power management
Figure 2. MIFARE SAM AV3 evaluation board - Power management
The MIFARE SAM AV3 evaluation board is equipped with a mini-USB port to power the
system. The port is only used for power, it is not used for any communication/debug etc.
The entire board can be powered by either the USB port or the 5 V line on the Arduino
header. The power LED signalizes the properly powered state of the board.
2.2 CLRC663
Figure 3. MIFARE SAM AV3 evaluation board - CLRC663

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Figure 4. MIFARE SAM AV3 evaluation board - Antenna matching
The MIFARE SAM AV3 evaluation board also has a CLRC663 contactless frontend
directly built-in, which can be interfaced via SPI, and I2C. All Interfacing options are
available and can be configured by jumpers. The SPI-Interface is directly connected to
the Arduino® header, the I2C interfaces are meant to be used by MIFARE SAM AV3 for
X-mode. Detailed instructions for the jumper settings can be found in section Jumper
setting
2.3 Arduino® R3 header
The MIFARE SAM AV3 evaluation board is equipped with a Arduino® R3 compatible
header. The evaluation board can be fully powered with the 5 V line from this header.
All other voltages are directly generated on the board out of this 5 V line. The header
also uses the SPI interface, which can be connected to the CLRC663 host interface for
direct communication. For SAM communication, the user can choose between 2 I2C
interfaces: The default one on IOH1 (called I2C1), as well as an alternative pinning on
AD1 (called I2C2). IO4 and IO5 are used for the CLRC663 PDOWN and IRQ, and IO6
can be jumpered to be the MIFARE SAM AV3 VDD.

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MIFARE SAM AV3 evaluation board
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Figure 5. MIFARE SAM AV3 evaluation board - Arduino header
After the I2C interface selection jumper from the MCU, the I2C interface is forced to 3V3.
This way, either 5 V or 3V3 MCU's can be used. As the MIFARE SAM AV3 is powered
by 3V3, the I2C interface voltage on SDA must not exceed this value. The SCL line of
this interface is shifted down to 1V8 directly on the MIFARE SAM Av3 add-on board. The
reason for this additional shifting is described in the datasheet
Figure 6. MIFARE SAM AV3 evaluation board - I2C interface selection

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2.4 MIFARE SAM AV3
Figure 7. MIFARE SAM AV3 evaluation board - MIFARE SAM AV3
The MIFARE SAM AV3 can be accessed by either its I2C_Slave(MCU_I2C_xxx) interface
from the host MCU, or the ISO7816 interface via the additional 16-pin header CN5. This
header is pin compatible to the Ashling IN_CLA7816 PCBs, and can be used with the
SUBD-15 adapter cable.
2.4.1 Add-on board
The MIFARE SAM AV3 itself is placed on an add-on board, to be able to easily
exchange the MIFARE SAM AV3 in case it has been misconfigured. The pullups for the
MCU_I2C_xxx interface, as well as the voltage level divider for the MCU_I2C_SCL is
directly placed on the add-on board.
Note: The value for R3 is chosen as 22k, because of the internal resistance of the TP2
pin being ~32k, which results in R4 || Rint = ~24k.

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Figure 8. MIFARE SAM AV3 evaluation board - MIFARE SAM AV3 add-on board

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MIFARE SAM AV3 evaluation board
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3 Jumper Setting
Figure 9. MIFARE SAM AV3 evaluation board - MIFARE SAM AV3
The MIFARE SAM AV3 evaluation board comes with 3 different colors of Jumpers:
•Green: Configuration of RC663 interfaces
•Yellow: MCU_I2C interface selection
•Red: MIFARE SAM AV3 configuration
3.1 CLRC663 Interface Selection
The CLRC663 NFC reader frontend generally has 2 interfaces: the Host interface and the
SAM interface.
The Host interface can be configured to SPI or I2C using the IFSEL0/1 pins of the
CLRC663. This is done with JP5 and JP6.

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Figure 10. Host Interface Selection - top: I2C, bottom: SPI
3.1.1 SPI
In case SPI is selected, the jumpers on the SPI header need to be inserted, to connect
the SPI interface from the MCU to the CLRC663. This setting is intended to use the
MIFARE SAM AV3 in S-mode, or in an S/X mixed variant.
Figure 11. SPI header

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At this point, the MCU can already control the CLRC663 via SPI.
3.1.2 I2C
In case I2C is selected, the CLRC663 will be controlled by the MIFARE SAM AV3 in X-
mode. 2 jumpers need to be inserted in the SPI header, these correspond to the ADR0
and ADR1 pins on the CLRC663 host interface in I2C configuration.
Figure 12. SPI header for I2C mode
Now, The host interface of the CLRC663 is configured as I2C and both ADR pins are
pulled to low. The MIFARE SAM AV3 Master I2C interface (SAM_I2C_xxx) can be routed
to the host interface of the CLRC663. This is done with JP1 and JP2.
Figure 13. I2C Selection - these jumpers route the SAM_I2C interface to either the
CLRC663 host interface (1) or the SAM interface (2)
3.1.3 SAM I2C
The SAM interface is a dedicated second interface for operation with a MIFARE SAM in
X-mode. This interface is switched off per default. If a user wants to connect the MIFARE
SAM AV3 via this interface, the I2C signal from the MIFARE SAM AV3 needs to be
routed to interface 2 on JP1 and JP2.

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Figure 14. Selection of CLRC663 SAM interface
If this interface is already activated by setting the corresponding bits in the HostCtl
register of the CLRC663, the above is enough to communicate between CLRC663 and
the MIFARE SAM AV3. If not, then an additional SPI connection for the MCU to the
CLRC663 is needed, to activate the SAM interface.
3.2 MCU Interface Selection
The connection between the MIFARE SAM AV3 and the MCU is done by either of the 2
supported I2C interface locations on the Arduino® R3 header. The selection is done by
JP3 and JP4, which are placed on the corresponding pins.

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MIFARE SAM AV3 evaluation board
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Figure 15. MCU_I2C selection
3.3 MIFARE SAM AV3
The MIFARE SAM AV3 evaluation board offers two options to interface the MIFARE
SAM AV3: I2C and ISO7816. All the preparation for I2C was already done in the previous
chapters. The only thing left to do is the VDD of the MIFARE SAM AV3. VDD is selected
on JP9, the options are permanent 3V3 or IO6 on the Arduino header. Permanent 3V3
means that the MIFARE SAM AV3 will stay in the state it is, until the whole board is
power cycled. The ATR of the SAM only needs to be retrieved once. Using IO6 as VDD
gives the user the possibility to only power cycle the MIFARE SAM AV3, therefore having
the option of a reset, without resetting the MCU.

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Figure 16. VCC selection of MIFARE SAM AV3
In case a user wants to access the MIFARE SAM AV3 via the ISO7816 SmartCard
interface, a Jumper needs to be placed on the ISO7816 header (JP7). Important: In this
case, the VDD selection jumper needs to be removed, as the MIFARE SAM AV3 VDD
needs to be controlled by the ISO7816 interface!
Figure 17. ISO7816 configuration of the MIFARE SAM AV3 evaluation board

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4 MIFARE SAM AV3 Configuration
In the default configuration of MIFARE SAM AV3, it expects a PN523 reader frontend for
X-mode communication. This needs to be changed using the SAM_SetConfig command
once. The command looks like the following:
80 3C 01 00 01 03
Table 2. SetConfiguration for reader frontend selection
Byte Value Meaning
CLA 0x80 Class
INS 0x3C Instruction: SAM_SetConfiguration
P1 0x01 Reader IC configuration
P2 0x00 RFU
Le 0x01 Length of subsequent data field
INF 0x03 X-mode frontend CLRC663
Along with this, the I2C processing clock speed needs to be adjusted. Per default, this
is set to I2C fast mode (12 MHz processing clock speed) and needs to be reduced for
CLRC663.
80 3C 02 00 01 06
Table 3. SAM_SetConfiguration for I2C processing clock speed
Byte Value Meaning
CLA 0x80 Class
INS 0x3C Instruction: SAM_SetConfiguration
P1 0x02 I2C processing clock speed
P2 0x00 RFU
Le 0x01 Length of subsequent data field
INF 0x06 I2C processing clock speed: 6 MHz
This reduces the I2C communication speed on the X-mode interface to ~400 kbit/s

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5 Modes of Operation
5.1 X-mode
The easiest way to get started with the MIFARE SAM AV3 evaluation board is to operate
the MIFARE SAM AV3 in X-mode. An example configuration for this would look like the
following
Figure 18. X-mode example configuration
In the configuration from image Figure 18, the SAM can be accessed via the I2C1
interface from the MCU, and will communicate to the CLRC663 via its host interface,
configured as I2C. The SAM VCC in this case is connected to IO6.
5.2 S-mode
Figure 19. S-mode example configuration

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In this S-mode configuration, the MIFARE SAM AV3 is not connected to the CLRC663.
The host MCU controls the CLRC663 via the SPI interface, and the MIFARE SAM AV3
via I2C1.
5.3 Mixed mode
Figure 20. X/S mixed configuration
In this configuration, the CLRC663 is connected on its host interface via SPI to the MCU,
and on the second interface via I2C to the SAM. The MIFARE SAM AV3 is connected
via I2C1 to the MCU. In this way, the MCU can control the CLRC663's LPCD procedure,
and if a card is detected, the SAM can be switched on and take over the control over the
CLRC663.
5.4 ISO7816 Interface
Figure 21. ISO7816 operation mode
In this configuration, the MIFARE SAM AV3 is controlled via the ISO7816 Interface,
which is available on the 16-pin header. The pinning there is compatible to the Ashling
IN-CLA7816USB-CL1 Antenna PCB, which is widely used with several contactless and
contact SmartCard products. Additionally, a separate PCB with a SIM-Card holder is

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MIFARE SAM AV3 evaluation board
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available. In case the SIM card form factor SAM is used, the add-on board needs to be
removed.
Figure 22. ISO7816 Probe
The green jumpers can be used as described above, all X-mode interfaces are available
in this mode as well.
If the CLRC663 frontend is used in this configuration, it must be powered via the USB
connector or via the 5 V power line on the Arduino header. The SAM VDD is controlled
via the ISO7816 interface. This opens up the possibility of also performing cold resets on
the MIFARE SAM AV3, while the CLRC663 stays powered.
In this configuration, The MIFARE SAM AV3 evaluation board can be used with a PC/SC
reader together with RFIDDiscover, to fully explorer all features of MIFARE SAM AV3 in
X-mode.
5.4.1 RFIDDiscover
When the MIFARE SAM AV3 board is configured to ISO7816 communication, the board
can be connected to an Ashling IN-CLA7816 adapter and inserted in a compatible PC/SC
reader.

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Figure 23. RFIDDiscover - New Profile
In the New Profile dialog, use the settings as shown in Figure Figure 23. Once OK
is clicked, RFIDDiscover performs a Host Authentication, as well as an RC_Init
command. From this point, the MIFARE SAM AV3 evaluation board can be used with
RFIDDiscover as any other reader. Details can be found in UM2538. Please ensure that
the SetConfiguration commands have been executed before, as described in Section 4
5.4.1.1 First Steps on a new MIFARE SAM AV3 Evaluation Board
The easiest way of getting stared with the MIFARE SAM AV3 evaluation board is using
the tool RFIDDiscover v. 4.7+ and the Evaluation Board Connected via the ISO7816-
probe and a contact reader.
Preliminary: Connect MIFARE SAM AV3 Evaluation Board using ISO7816 Probe to a
contact reader, and power the board using the USB-Slot. Jumper configurations must be
as shown in Figure 21
Step 1: Open RFIDDiscover and choose following settings

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Figure 24. Open Profile Dialog - Select your contact reader, click OK
A new MIFARE SAM AV3 is in unactivated state, and needs activation first. This is
done by using the Lock/Unlock command with the activation option. More details can be
found in the datasheet. As RFIDDiscover does some steps like host authentication and
RC_Init automatically upon connection, the very first connection attempt will give an error
message, as these operations are not possible with an unactivated MIFARE SAM AV3.
Figure 25. Error message
Step 2: Activate MIFARE SAM AV3
To activate the MIFARE SAM AV3, navigate to the MIFARE SAM AV3 tab, which can be
found in the top right of the window. In the menu on the left, choose "SAM AV3 → SAM
Host Communication → Lock / Unlock". Use the settings as in below screenshot. Note:
the "Reference Key" needs to point to an all 0x00 AES-128 Key in the RFIDDiscover
KeyStore. Click "LockUnlock"