802.15.4
ATSAMR21G18-MR210UA
DATASHEET PRELIMINARY
Description
The ATSAMR21G18-MR210UA is a 20mm x 19mm wireless module with a
solder mount footprint. It integrates an ATSAMR21G18 IC together with a
serial flash and a crypto authentication device.
Features
ATSAMR21G18 system in package
Single-chip ARM® Cortex®-M0+ based 32-bit Microcontroller
Low power 2.4GHz transceiver for IEEE 802.15.4 and ZigBee
applications
256KB Flash
Maximum Operating Frequency: 48 MHz
128-bit AES crypto engine
32-bit MAC symbol counter
Temperature sensor
Automatic transmission modes
AT45DB041E 4-Mbit DataFlash
ATECC508A CryptoAuthentication Device
Secure Hardware-based Key Storage
Performs High-Speed Public Key Algorithms
NIST Standard P256 Elliptic Curve Support
SHA-256 Hash Algorithm with HMAC Option
Guaranteed Unique 72-bit Serial Number
High-quality FIPS Random Number Generator (RNG)
Intrusion Latch for External Tamper Switch
Single 1.8V - 3.6V supply
Radio module with a link budget of 103dBm
FCC / ETSI compliant RF front end with harmonic filter
Three SERCOM units left for external applications
32.768kHz crystal oscillator
High precision 16MHz crystal oscillator
12-bit, 350ksps Analog-to-Digital Converter (ADC)
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I2C up to 3.4MHz
Full-speed (12Mbps) Universal Serial Bus (USB) 2.0 interface
17 external GPIO lines
One GPIO for ATECC508A intrusion latch
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Table of Contents
Description.......................................................................................................................1
Features.......................................................................................................................... 1
1. Integrated Devices and Block Diagram..................................................................... 4
1.1. Module Block Diagram................................................................................................................. 4
1.2. Integrated Peripherals.................................................................................................................. 4
1.3. RF Front End Control................................................................................................................... 5
2. Mechanical Description..............................................................................................7
2.1. Mechanical Dimensions................................................................................................................7
2.2. Footprint and Layout Recommendation....................................................................................... 7
3. I/O Pin Assignment....................................................................................................9
4. Electrical Characteristics..........................................................................................11
4.1. Absolute Maximum Ratings........................................................................................................11
4.2. Recommended Operating Ratings............................................................................................. 11
4.3. Module Performance Data..........................................................................................................11
5. Non-Volatile Memory Information............................................................................ 13
6. Radio Certification................................................................................................... 14
6.1. United States (FCC)................................................................................................................... 14
6.2. Europe (ETSI).............................................................................................................................14
6.3. Industry Canada (IC) Compliance Statements...........................................................................15
6.4. Approved Antennas....................................................................................................................16
7. Boot Loader............................................................................................................. 17
8. Ordering Information................................................................................................18
9. References.............................................................................................................. 19
10. Revision History.......................................................................................................20
1. Integrated Devices and Block Diagram
1.1. Module Block Diagram
Figure 1-1 Module Block Diagram
ATSAMR21G18-MR210UA
AT45DB041E
ATECC508
4-Mbit DataFlash
CryptoAuthentication
Device
Balun &
Harmonic Filter
Antenna Diversity
Switch
U.Fl
50Ohm
U.Fl
50Ohm
1 GPIO 17 GPIO
SPI
SWI
ATSAMR21G18
ARM® Cortex®-M0+
1.2. Integrated Peripherals
1.2.1. Serial Flash Interconnection
Table 1-1 Serial Flash Interconnection
DataFlash Signal MCU Function MCU Pin Port and SERCOM Configuration
SO MISO 37 PA22 SERCOM5 PAD[2] DIPO=0x2
SI MOSI 38 PA23 SERCOM5 PAD[3] DOPO=0x2
SCK SCK 48 PB03 SERCOM5 PAD[1] DOPO=0x2
#CS GPIO 47 PB02 to be set low in software before SPI access
The signals in this table are not available as module I/O. More information about the FLASH IC can be
found in its related datasheet [ADESTO].
1.2.2. UART with Hardware Flow Control (RTS/CTS)
For an Application where the ADC is not in use, SERCOM0 can be multiplexed as shown in the table
below.
Table 1-2 UART with Hardware Flow Control (RTS/CTS)
Module Pin MCU Function MCU Pin Port and SERCOM Configuration
14 UART TX 15 SERCOM0; MUX=C; PAD[0] TXPO=0x2
25 UART RX 10 SERCOM0; MUX=D; PAD[1] RXPO=0x1
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Module Pin MCU Function MCU Pin Port and SERCOM Configuration
26 UART RTS 11 SERCOM0; MUX=D; PAD[2] TXPO=0x2
13 UART CTS 12 SERCOM0; MUX=D; PAD[3] TXPO=0x2
The signals in this table are not available as module IO. More information about the FLASH IC can be
found in its related datasheet. (ADESTO)
1.2.3. 32kHz Crystal
PA00 and PA01 are used for the 32kHz crystal. This pins are not available as module IO.
1.2.4. SAM R21 USB Availability
The USB pins are made available as differential pair routed GPIO’s. A base board with the required
connection hardware can support an USB interface.
Table 1-3 SAM R21 USB Availability
Module Pin Function MCU Pin Port Configuration or Xplain Function
19 GPIO or USB_D+ 33 PA24: For USB MUX=G
20 SPIO or USB_D- 34 PA25: For USB MUX=G
The module power supply can’t be operated directly from a 5V USB source. The module base board has
to implement the required voltage regulator.
1.3. RF Front End Control
The antenna diversity signals ANT_DIV_P/N are used to control the diversity switch U4. The signal
ANT_DIV_P is available at the IO ring pin 18 to indicate the antenna currently in use.
In addition at pin 17, the RX_TX indicator signal is available to indicate if the module is currently in
transmit mode.
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Table 1-4 RF Front End Control
RF Front End Signal MCU Function MCU Pin Port and SERCOM
Configuration
ANT_DIV_P FECTRL2 21 PA12; MUX=F;
F3CFG=DIG1
Available at module pin
18
ANT_DIV_N FECTRL1 16 PA09; MUX=F;
F1CFG=DIG2
FEM_RX_TX FECTRL3 22 PA13; MUX=F;
F0CFG=DIG3 for High
active TX indication
F0CFG=DIG4 for Low
active TX indication
Available at module pin
17
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2. Mechanical Description
2.1. Mechanical Dimensions
Dimensions are in mm. The module pins are arranged with a 1mm pitch distance. The module is
designed in a symmetric way.
Figure 2-1 Module Bottom Dimensions ( Seen from a CAD top perspective )
The module can be mounted to a base board with a soldered RF connection. For this case one or both
U.Fl connectors are left unconnected and the RF pads on the bottom side are used to feed an antenna
located on the base board.
2.2. Footprint and Layout Recommendation
Since the module does not contain an antenna, the module does not set any limits for the base board
material selection or the board stack-up construction. The module does also not require a certain
positioning on the board in relation to the board edge. The module must be placed away from interference
sources on the base board like clock oscillators or step converters. The area underneath the module must
be filled with a grounded copper plane. The RF-Pad area needs special attention. The following sections
provide more information on that.
A typical design is supposed to connect the I/O ring to the base board while the antenna feeds are using
the U.Fl connectors. Using the antennas in Approved Antennas on page 16, the modular approval for
the final product can be used without re-certification.
2.2.1. Design without RF-Pads
For a design without U.Fl connected antennas, the base board design has to have no copper fill within the
RF-Pad area (*!). All layers with less than 0.5mm distance from top shall not be filled with copper
underneath the RF-Pad area.
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For all other I/O pads the geometry in below figure should be used.
Figure 2-2 Recommended Base Board Layout
2.2.2. Design without RF-Pads
For applications where the antenna is implemented on the base PCB, the RF-Pads can be used to
connect the RF signals. The pad layout is available in Figure 2-2 Recommended Base Board Layout on
page 8. The base board traces shall be designed with a line impedance of 50Ohm. Depending on the
base board stack construction a microstrip or a grounded coplanar design can be implemented. The best
choice will be the line type with the best match in between line width and the 0.8mm pad width.
For all other IO pads the geometry in Figure 2-2 Recommended Base Board Layout on page 8 should be
used.
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3. I/O Pin Assignment
The module pin assignment is shown in below table. The Column "MCU pin" is referring to the
ATSAMR21G18 datasheet [SAMR21]. The column “Port Configuration” is intended to help determine the
required SAMR21 port configuration..
Table 3-1 RF Front End Control
Module Pin Function MCU Pin Port Configuration
1 GND
2 GND
3 VCC
4 VCC
5 RSTN 40
6 SPI_CS 26 SERCOM1; MUX=C; DOPO=0x1; Master PAD1
7 SPI_MOSI 27 SERCOM1; MUX=C; DOPO=0x1 Master PAD2
For slave operation this pin is MISO
8 SPI_MISO 25 SERCOM1; MUX=C; DIPO=0x0 Master PAD0
For slave operation this pin is MOSI
9 SPI_SCLK 28 SERCOM1; MUX=C; DOPO=0x1 Master PAD3
10 GPIO 41 PA28 (Yellow LED; low active)
11 - Not connected
12 GND
13 RXD1 12 SERCOM0; MUX=D; PAD[3] RXPO=0x3
Can be used for UART with RTS/CTS
14 TXD1 15 SERCOM0; MUX=C; PAD[0] TXPO=0x0
Can be used for UART with RTS/CTS
15 - Not connected
16 - Not connected
17 FEM_RX_TX 22 PA13; MUX=F; FECTRL3 (LED red)
18 ANT_DIV_P 21 PA12; MUX=F; FECTRL2 (LED green)
19 GPIO/USB_DM 33 PA24 for USB MUX=G
20 GPIO/USB_DP 34 PA25 for USB MUX=G
21 - Not connected
22 RXD0 24 SERCOM2; MUX=C; PAD[3]; RXPO=0x3
23 TXD0 23 SERCOM2; MUX=C; PAD[2]; TXPO=0x1
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Module Pin Function MCU Pin Port Configuration
24 AREF 9 MUX=B; disable digital
25 ADC0 10 MUX=B; AIN[1]; disable digital
Can be used for UART with RTS/CTS
26 ADC1 11 MUX=B; AIN[2]¸ disable digital
Can be used for UART with RTS/CTS
27 - Not connected
28 - Not connected
29 GND
30 SWCLK 45 Programming interface
31 SWDIO 46 Programming interface
32 - Not connected
33 ATECC508 GPIO Crypto IC GPIO with intrusion detection feature
34 - Not connected
35 - Not connected
36 I2C SCL 32 SERCOM3 PAD1 MUX=C
37 I2C SDA 31 SERCOM3 PAD0 MUX=C
38 - Not connected
39 - Not connected
40 - Not connected
41 GND
42 GND
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4. Electrical Characteristics
This section will outline the main parameters required to build applications. The module characteristics
are determined by the implemented parts. See References on page 19 for required datasheet
references.
4.1. Absolute Maximum Ratings
Table 4-1 Absolute Maximum Ratings
Symbol Parameter Condition Min. Typ. Max. Unit
TSTOR Storage temperature -40 +125 °C
VPIN Pin voltage with
respect to GND and
VDD
GND-0.3V VDD+0.3V V
VESD ESD robustness Modules I/O's
routed to SAM
R21
Human Body
Model
4 kV
Charged
Device Model
550 V
PRF Input RF level +10 dBm
4.2. Recommended Operating Ratings
Table 4-2 Recommended Operating Ratings
Symbol Parameter Condition Min. Typ. Max. Unit
TOP Operating temperature range -40 85 °C
VDD Supply voltage 1.8 3.6 V
4.3. Module Performance Data
If not otherwise stated the measurements are done with VDD=3.3V at 25°C.
Table 4-3 Module Performance Data
Symbol Parameter Condition Min. Typ. Max. Unit
IDD Supply current MCU at TBD MHz(1)
With transceiver in RX_ON state
With transceiver in TX state
4
10
10
mA
PRF RF transmit power U.Fl interface 2 3.5 dBm
Pemit Radiated transmit power Using antenna ANT-24G-S21-P5FL(2)
Using antenna M07-FL(3)
3.5
8
8dBm
EIRP
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Symbol Parameter Condition Min. Typ. Max. Unit
PSPUR_TX Transmitter spurious
emissions
U.Fl connector, conducted, >2.5GHz -50 dBm
PSENS Receiver sensitivity U.Fl interface -98 dBm
dod Outdoor range Using antenna ANT-24G-S21-P5FL
ANT-24G-S21-P5FL in Ch26(2)
Using antenna M07-FL
M07-FL in Ch26(3)
TBD
TBD
TBD
TBD
m
fRef_0 Reference crystal
deviation
T = 25°C default XTAL_TRIM setting
T = 25°C NV memory XTAL_TRIM setting
-5
-5
+20
+5
ppm
fRef_T Reference crystal drift
over temperature
-40°C <TOP< +85°C -15 +15 ppm
f32k_0 Watch crystal deviation T = 25°C default XTAL_TRIM setting
T = 25°C NV memory XTAL_TRIM setting
TBD
TBD
ppm
f32lk_T Watch crystal drift over
temperature
-40°C <TOP< +85°C TBD ppm
Note: 
1. Transceiver state TRX_OFF, FLASH deselect.
2. For FCC band edge compliance it is required to operate Ch26 with not more than power level 13.
3. For FCC band edge compliance it is required to operate Ch26 with not more than power level 14
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5. Non-Volatile Memory Information
The SAM R21 provides a user readable Non-Volatile Memory (NVM) space referred to as the user row in
the data sheet. The base address for the application is 0x804008.
Table 5-1 NVM (User Row) Data
Offset Address Field Name Field Description Length
+0x00 MIB_REVISION Data structure revision 0x1501 2 Bytes
+0x02 MAC_IEEE_ADDRESS Module specific IEEE MAC Address 8 Bytes
+0x0A BOARD_SERIAL Module specific serial number 10 Bytes
+0x14 ATMEL_PART_NO Product specific part number 8 Bytes
+0x1C PCBA_REV Product PCB/assembly revision 1 Byte
+0x1D XTAL_TRIM Reference crystal calibration value 1 Byte
+0x1E CRC16 Checksum for this data structure 2 Bytes
The end user application software has to copy two data fields to radio transceiver registers. The data in
MAC_IEEE_ADDRESS have to be copied to the registers IEEE_ADDR_0 to _7. The
MAC_IEEE_ADDRESS is stored little endian with the first byte stored at the lowest address.
The XTAL_TRIM value has been determined during production test and needs to be copied to the
transceiver XTAL_TRIM section inside the XOSC_CTRL register. This will reduce the absolute deviation
for the 16MHz reference crystal. See Module Performance Data on page 11 for parameter details.
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6. Radio Certification
The module ATSAMR21G18-MR210UA in combination with the approved antennas listed in Approved
Antennas on page 16 have received regulatory approvals for modular devices in the United States and
European countries.
6.1. United States (FCC)
The module ATSAMR21G18-MR210UA complies with the requirements of FCC part 15.
To fulfill FCC Certification requirements, an OEM manufacturer must comply with the following
regulations:
The modular transmitter must be labeled with its own FCC ID number, and, if the FCC ID is not
visible when the module is installed inside another device, then the outside of the device into which
the module is installed must also display a label referring to the enclosed module.
This exterior label can use wording such as the following. Any similar wording that expresses the
same meaning may be used.
Sample Label for integration of ATSAMR21G18-MR210UA:
Contains FCC-ID: VNR-ATSAMR210UA-0
This device complies with Part 15 of the FCC Rules. Operation is subject to the following
two conditions: (1) this device may not cause harmful interference, and (2) this device
must accept any interference received, including interference that may cause undesired
operation.
This equipment complies with Part 15 of the FCC Rules. Operation is subject to the following two
conditions: (1) this device may not cause harmful interference, and (2) this device must accept any
interference received, including interference that may cause undesired operation (FCC 15.19). The
antenna(s) used for this mobile transmitter must provide a separation distance of at least 20 cm from all
persons and must not be co-located or operating in conjunction with any other antenna or transmitter.
Installers must be provided with antenna installation instructions and transmitter operating conditions for
satisfying RF exposure compliance. This device is approved as a mobile device with respect to RF
exposure compliance, and may only be marketed to OEM installers. Use in portable exposure conditions
(FCC 2.1093) requires separate equipment authorization.
Modifications not expressly approved by this company could void the user's authority to operate this
equipment (FCC section 15.21).
To be compliant with FCC part 15 the transmit power setting (register 0x05, PHY_TX_PWR) for channel
26 must not exceed the values in Table 6-1 Approved Antennas on page 16. The module application
software must ensure this settings for operation within the FCC territory.
6.2. Europe (ETSI)
The module ATSAMR21G18-MR210UA is conform for use in European Union countries.
If the ATSAMR21G18-MR210UA module is incorporated into a product, the manufacturer must ensure
the compliance of the final product to the European harmonized EMC and low-voltage/safety standards. A
Declaration of Conformity must be issued for each of these standards and kept on file as described in
Annex II of the R&TTE Directive.
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The manufacturer must maintain a copy of the ATSAMR21G18-MR210UA module documentation and
ensure the final product does not exceed the specified power ratings, antenna specifications, and/or
installation requirements as specified in the user manual. If any of these specifications are exceeded in
the final product, a submission must be made to a notified body for compliance testing to all required
standards.
The CE marking must be affixed to a visible location on the OEM product. The CE mark shall consist of
the initials "CE" taking the following form:
If the CE marking is reduced or enlarged, the proportions must be respected.
The CE marking must have a height of at least 5 mm except where this is not possible on account
of the nature of the apparatus.
The CE marking must be affixed visibly, legibly, and indelibly.
More detailed information about CE marking requirements can be found at "DIRECTIVE 1999/5/EC OF
THE EUROPEAN PARLIAMENT AND OF THE COUNCIL" on 9 March 1999 at section 12.
For the operation in Europe, there is no power setting limit.
6.3. Industry Canada (IC) Compliance Statements
This device complies with Industry Canada license-exempt RSS standard(s). Operation is subject to the
following two conditions: (1) this device may not cause interference, and (2) this device must accept any
interference, including interference that may cause undesired operation of the device.
Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts
de licence. L'exploitation est autorisée aux deux conditions suivantes : (1) l'appareil ne doit pas produire
de brouillage, et (2) l'utilisateur de l'appareil doit accepter tout brouillage radioélectrique subi, même si le
brouillage est susceptible d'en compromettre le fonctionnement.
This equipment complies with radio frequency exposure limits set forth by Industry Canada for an
uncontrolled environment. This equipment should be installed and operated with minimum distance 20 cm
between the device and the user or bystanders.
Cet équipement est conforme aux limites d'exposition aux radiofréquences définies par Industrie Canada
pour un environnement non contrôlé. Cet équipement doit être installé et utilisé avec un minimum de 20
cm de distance entre le dispositif et l'utilisateur ou des tiers.
CAUTION: Any changes or modifications not expressly approved by the party responsible for compliance
could void the user’s authority to operate the equipment. The OEM integrator is still responsible for testing
their end-product for any additional compliance requirements required with this module installed (for
example, digital device emissions, PC peripheral requirements, etc.). This Module is labeled with its own
IC ID. If the IC ID Certification Number is not visible while installed inside another device, then the device
should display the label on it referring the enclosed module. In that case, the final end product must be
labelled in a visible area with the following:
“Contains Transmitter Module IC: 20266-ATSAMR210UA0”
OR
“Contains IC: 20266-ATSAMR210UA0”
Ce module est étiqueté avec son propre ID IC. Si le numéro de certification IC ID n'est pas visible lorsqu'il
est installé à l'intérieur d'un autre appareil, l'appareil doit afficher l'étiquette sur le module de référence ci-
joint. Dans ce cas, le produit final doit être étiqueté dans un endroit visible par le texte suivant:
“Contains Transmitter Module IC: 20266-ATSAMR210UA0”
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OR
“Contains IC: 20266-ATSAMR210UA0”
6.4. Approved Antennas
The device has been tested and approved for use with the antenna type listed below. The device may be
integrated with other custom design antennas which OEM installer must authorize with respective
regulatory agencies. The used antenna is to be connected to the Radio PCB via U.Fl connection.
Table 6-1 Approved Antennas
Manufacturer Part Number Description Gain FCC Max. Ch26
Power Register
Settings
RF Solutions ANT-24G-S21-P5FL 21mm quarter wave monopole with
U.Fl pigtail
0dBi 13..15
TekfunCo.,LTD M07-FL 170mm quarter wave monopole
with U.Fl pigtail
5dBi 14..15
The above table shows the allowed power settings for Channel 26 if the equipment is operated under
FCC conditions.
According to KDB 178919 [Policy] it is allowed to substitute approved antennas through equivalent
antennas of the same type with equal or less antenna gain:
‘Equivalent antennas must be of the same type (e.g., yagi, dish, etc.), must be of equal or less gain than
an antenna previously authorized under the same FCC ID, and must have similar in band and out-of-band
characteristics (consult specification sheet for cutoff frequencies).’
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7. Boot Loader
The module will be delivered with a pre flashed boot loader. Refer to the boot loader manual for detailed
information. It is online available under the Application Note code AVR2054.
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8. Ordering Information
Module Type Packaging(1) Ordering Code Package Operational Range
ATSAMR21G18-
MR210UA Tape & Reel ATSAMR21G18-
MR210UA-T
19mm x 20mm
SMT
Industrial (-40oC to
85°C)
Note: 
1. MOQ is a reel with 200 modules.
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9. References
1. ADESTO. (n.d.). Adesto Technologies. Retrieved from AT45DB041E Datasheet: http://
www.adestotech.com
2. ATECC508. (n.d.). www.atmel.com. Retrieved from ECC-based Devices: http://www.atmel.com/
products/security-ics/cryptoauthentication/ecc-256.aspx
3. Policy, P. C. (n.d.). 178919 D01 Permissive Change Policy. Retrieved from FCC OET: https://
apps.fcc.gov/oetcf/kdb/forms/FTSSearchResultPage.cfm?id=33013&switch=P
4. SAM R21. (n.d.). www.atmel.com. Retrieved from http://www.atmel.com/Images/Atmel-42223-SAM-
R21_Datasheet.pdf
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10. Revision History
Doc Rev. Date Description
42475B 09/2015 Updated United States (FCC) on page 14.
Added Industry Canada (IC) Compliance Statements on page 15
42475A 07/2015 Initial document release.
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applications where the failure of such products would reasonably be expected to result in significant personal injury or death (“Safety-Critical Applications”) without
an Atmel officer's specific written consent. Safety-Critical Applications include, without limitation, life support devices and systems, equipment or systems for the
operation of nuclear facilities and weapons systems. Atmel products are not designed nor intended for use in military or aerospace applications or environments
unless specifically designated by Atmel as military-grade. Atmel products are not designed nor intended for use in automotive applications unless specifically
designated by Atmel as automotive-grade.