Wahoo Fitness WF116 GEM 2 Radio Module User Manual
Wahoo Fitness LLC GEM 2 Radio Module
User Manual
GEM 2 Dual Band Bluetooth and ANT+ Module
Hardware Integration Guide
Version 0.1
July 27, 16
Wahoo Fitness
90 W. Wieuca Road N.E. Suite 110
Atlanta, GA 30342
Telephone: 1‐877‐978‐1112
Email: support@wahoofitness.com
www.wahoofitness.com
GEM 2 Module Hardware Integration Guide Version 0.1
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© Wahoo Fitness LLC 2015
Revision History
Version Revision Date Change History
0.1 May 2, 2016 Initial Draft
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Contents
REVISION HISTORY 2
CONTENTS 3
OVERVIEW AND KEY FEATURES 4
FEATURES 4
SPECIFICATION 5
SPECIFICATION SUMMARY 5
HARDWARE SPECIFICATIONS 6
BLOCK DIAGRAMS AND PINOUT 6
PIN DEFINITIONS 7
ELECTRICAL SPECIFICATIONS 8
DESIGN CONSIDERATIONS 8
HARDWARE 8
MODULE LAYOUT CONSIDERATIONS 10
ANTENNA CHARACTERISTICS 11
MECHANICAL INFORMATION 12
DIMENSIONS (IN MM)12
RECOMMENDED PAD LAYOUT 12
TAPE AND REEL INFORMATION 13
SOLDERING GUIDELINES 13
REGULATORY & STANDARDS INFORMATION 13
FCC & INDUSTRY CANADA 13
FEDERAL COMMUNICATION COMMISSION (FCC) RADIATION EXPOSURE STATEMENT: 13
FCC LABELING REQUIREMENTS 13
FCC WARNING:14
INDUSTRY CANADA (IC) WARNING:14
CE 16
BLUETOOTH QUALIFICATION 17
ORDERING DETAILS 17
FURTHER ASSISTANCE 17
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Overview and Key Features
The GEM module has been designed to allow OEMs to easily add Bluetooth and ANT+
wireless connectivity in their product offering. The GEM 2 module incorporates Wahoo
Fitness software specifically designed to enable fitness machines such as treadmills,
exercise bikes, ellipticals, rowers, stair climbers and step machines to wirelessly
communicate exercise data with smart phone or tablets as well as leaderboard software
systems. For applications other than fitness machines, developer’s can use Nordic
Semiconductor’s SDK to create their own embedded application specific software.
The GEM 2 module is based on Nordic Semicondutor’s nRF52832 multiprotocol Bluetooth
and ANT+ chipset. The GEM 2 module offers a variety of peripheral interfaces including
UART, SPI, I2C, ADC, and GPIO, has a maximum transmit power of +4dBm, and a sensitivity
of ‐96dBm. This manual is intended to assist hardware integration of the GEM2module
into a given design. Details on Wahoo’s GEMSAFE and GEMHCI software can be found
www.wahoogy.com. For applications using Nordic Semiconductor SDK, please refer to
Nordic Semiconductor’s SDK available at developer.nordicsemi.com.
Features
• ‐96 dBm sensitivity
• TX Power‐20 to +4dBm in 4dB steps
•xxmlineofsightrange
•5.3mApeakTX@0dB
•5.4mApeakRX
• 1dB dB RSSI resolution
•ARM®Cortex
TMM4F 32 bit processor running at 64MHz
• 512 kB embedded flash memory and 64 kB RAM
• Onboard NFC for Out of Band pairing
• Peripheral Interfaces: ADC, GPIO, SPI, I2C, UART, Low power comparator,
Temperature sensor
•AESHWencryption
• FCC, CE, IC certified
• Integrated Antenna
• RoHS compliant
• Bluetooth End Product Listed
• Integrated Fitness Equipment Firmware and mobile application
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Specification
Specification Summary
Category Feature Implementation
RF Bluetooth
ANT+
Frequency
Maximum Transmit Power
Minimum Transmit Power
Receive Sensitivity
Range
4.1SingleModePeripheral
Broadcast
2.402‐2.480 GHz
+4dBm
‐20dBm
‐96dBm
up to TBDm line of sight
Peripherals UART Host Interface
GPIO
TX, RX 115.2kbps n,8,1
Link Indicator
Pairing Button
FW Upgrade Wahoo Firmware Over the air
Via JTAG interface
Control Protocol GEMSAFE or GEMHCI CSAFE Command Interface
or GEM HCI binary command
interface
Supply Voltage Min
Max
Recommended
1.7V
3.6V
3.0V
Power Consumption TBD
Physical TBD.mm x TBDmm
Environmental ‐40 to +85C
Approvals FCC, IC, CE, Bluetooth EPL
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Hardware Specifications
Block Diagrams and Pinout
Hardware Block Diagram Software Diagram
(
P0 .0 1) 11
(
P0 .0 2) 12
(
P0 .0 8) 14
18 (VCC)
26 (G N D)
17 (GND)
(LED1) 10
(
P0 .0 7) 13
(
NF C1) 15
(
NF C 2) 16
( P0.05) 8
( P0.30) 6
(P 0.27) 3
(GND) 0
( P0.31) 7
(PAIR) 9
(GND) 1
( P0.26) 2
( P0.28) 4
( P0.29) 5
20 (P0.1 5)
23 (SW DCLK)
19 (P0.14)
25 (P0.21/RST)
24 (RESERVED)
22 (SW DI O)
21 (P0.1 6)
Pinout Diagram
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Pin Definitions
Pin number Pin Name Function Comment
0GND ConnecttoGNDPlane
1GND ConnecttoGNDPlane
2SPIEnableSPImodeenable
3 LED GPIO to trigger LED for
pairing/connection
indication
Active High
4 Programmable I/O ADC or GPIO
5 Programmable I/O ADC or GPIO
6 Programmable I/O ADC or GPIO
7 Programmable I/O ADC or GPIO
8NC
9 NC RESERVED Reserved for 32kHz
crystal if a real time
clock is needed during
module sleep
10 NC RESERVED Reserved for 32kHz
crystal if a real time
clock is needed during
module sleep
11 NC
12 PAIR GPIO to trigger
advertising
Active low
13 UART TX/SPI MISO Host interface
14 UART RX/SPI MOSI Host interface
15 NFC1 NFC antenna input 1
16 NFC2 NFC antenna input 2
17 GND Module Power Ground
18 VCC Module Power Supply
19 UART CTS/SPI Slave
Event
Flow control
20 UART RTS/SPI SS Flow control
21 GPIO/SPI SCLK GPIO or SPI Clock
22 RESET/SWDIO Debug Interface
23 SWCLK Debug Interface
24 Wake Wakes module from sleep
25 RESET Module Reset
26 GND Connect to GND Plane
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Electrical Specifications
Absolute Maximum ratings
Maximum and minimum ratings for digital and analog pins are listed below.
Parameter Min Max
VCC Voltage ‐0.3V +3.9V
Voltage at VIO ‐0.3V VCC+.3V
Storage Temperature ‐40C +85C
Recommended Operating Parameters
Parameter Min Typical Max
VCC 1.7V 3.0V 3.6V
VCC maximum ripple 10mV
VCC Rise time 60ms
Operating Temperature @ 3.3V ‐40C +85C
Design Considerations
The GEM 2 module has been designed for easy integration into OEM applications requiring
minimal additional componentry. The following section provides suggestions to ensure
successful design in of the GEM 2 module.
Hardware
VCC
Ensure the power source operating range and noise is within the specified limits for the
GEM 2 module and filter capacitors are incorporated as needed. The GEM 2 module
includes decoupling capacitors for circuits within the module. External circuits sharing the
same power source should also be decoupled locally at connections to VCC andGND.
Updating Module Firmware
The GEM 2 module firmware can be updated over the air using the Wahoo utility
application. The Wahoo utility application can be downloaded here: www.xxxx.yyy.com
The GEM 2 module firmware can also be updated through the Serial Wire Debug interface.
The following circuit example provides a reference for developers wantinganalternativeto
programming the GEM 2 module over the air:
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Example for Serial Wire Debug Interface
UART Host
TheUARTisrequiredforcommunicatingbetween the GEM 2 module and fitness machine
console using the GEMSAFE or HCI command protocol. Pins 13 and 14 of the module have
been configured as the UART interface. Pin 13 is the UART TX line and pin 14 is the UART
RX line.
Reset
The GEM 2 module can be reset by holding PIN 25 low for 0.5us. The following is an
example reset circuit:
Example Reset Circuit
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Module Layout Considerations
1. Good: Place module antenna side as close as possible to the board edge. Better:
Allow module antenna area to overhang the edge of the board by ~5.6mm.
2. Good: Define a copper keepout area approx. 53mm x 20mm, 6mm in from module
edge. Better: Increase the keepout area, starting at 6mm in from module edge.
3. Mechanical items (especially metal) should be kept as far as possible from the
module antenna in all directions, including above and below the board surface. If
possible, move mechanical items out and away from the keepout area.
4. Bottom layer ground plane under the module strongly recommended. Connect all
ground pins directly to ground plane.
5. Top layer ground plane is good to have wherever practical, but avoid having copper
directly under the module.
6. Place Via stitching where both top and bottom layer ground planes are used,
especially along the plane edges adjacent the module.
Top‐side area directly under the module should be kept clear of copper, silkscreen and
vias
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Antenna Characteristics
The GEM 2 module includes an integrated monopole chip antenna. Antenna performance
will depend on host PCB layout. The following plots show antenna radiation pattern of the
GEM 2 antenna.
2.4GHz 2.442GHz 2.484GHz
Antenna Gain: 5.46dBi (Typ.)
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Mechanical Information
Dimensions (in mm)
Top View Side View
Recommended Pad Layout
The land pattern dimensions can be modified based on experience.
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Tape and Reel Information
TBD
Soldering Guidelines
See the Stencil pattern above for solder paste application. Recommended Stencil thickness
is 120um.
Regulatory & Standards Information
FCC & Industry Canada
The GEM 2 module has modular approval for the United States and Canada. To ensure
compliance when using the GEM 2 module in a design, the OEM is required to adhere to the
implementation considerations supplied in this hardware integration guide.
Federal Communication Commission (FCC) Radiation Exposure Statement:
This device is in compliance with SAR for general population/uncontrolledexposurelimits
in ANSI/IEEE C95.1‐1999 and had been tested in accordance with the measurement
methods and procedures specified in OET Bulletin 65 Supplement C.
This transceiver must not be co‐located or operating in conjunction with any other antenna,
transmitter, or external amplifiers. Further testing / evaluation of the end product will be
required if the OEM’s device violates any of these requirements.
The GEM 2 Module is fully approved for mobile and portable applications.
FCC Labeling Requirements
WARNING: The OEM must ensure that FCC labeling requirements are met. This includes a
clearly visible label on the outside of the OEM enclosure specifying the appropriate FCC
identifier is visible.
Contains FCC ID: PADWF116
IC: 10563A‐WF116
If OEM device is larger than 8x10cm, the following FCC part 15.19 statement has to be
visible on outside of device:
The enclosed 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.
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Label and text information type should be large enough to be legible and consistent with the
dimensions of the equipment and the label. The type size is not required to belargerthan
eight points.
Comments
The OEM should have their device tested by a qualified test house to verify compliance with
FCC Part 15 Subpart B limits for unintentional radiators.
Any modifications to the GEM 2 module could void the OEM’s authority to operate the
equipment.
This equipment has been tested and found to comply with the limits for a ClassBdigital
device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a residential installation. This
equipment generates, uses, and can radiate radio frequency energy and, if not installed and
used in accordance with the instructions, may cause harmful interference to radio
communications. However, there is no guarantee that interference will notoccurina
particular installation. If this equipment does not cause harmful interference to radio or
television reception, which can be determined by turning the equipment offandon,theuser
is encouraged to correct the interference by one or more of the following measures:
Re‐orient or relocate the receiving antenna
Increase the separation between the equipment and the receiver
Connect the equipment to an outlet on a circuit that is different from that towhich
the receiver is connected.
Consult the dealer or an experienced radio/TV technician for help.
FCC Warning:
“THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES AND INDUSTRY CANADA
LICENSE‐EXEMPT RSS STANDARD(S). 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.
Industry Canada (IC) Warning:
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.
French equivalent:
Le présent appareil est conforme aux CNR d'Industrie Canada applicable auxappareilsradio
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
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tout brouillage radioélectrique subi, même si le brouillage est susceptible d'en
compromettre le fonctionnement.
IC Radiation Exposure Statement
This device is in compliance with SAR for general population/uncontrolledexposurelimits
in IC RSS‐102 and had been tested in accordance with the measurement methodsand
procedures specified in IEEE 1528.
REMARQUE IMPORTANTE
Déclaration IC d'exposition aux radiations Ce EUT est conforme avec SAR pour la
population générale / limites d'exposition non contrôlée à IC RSS‐102 et a été testé en
conformité avec les méthodes de mesure et procédures spécifiées dans la norme IEEE 1528.
Modular Approval
OEM is still responsible for testing their product for any additional compliance
requirements required with this module installed (for example, digital device emissions, PC
peripheral requirements, etc.).
Approbation modulaire
OEM intégrateur est toujours responsable de tester leur produit final pour les exigences de
conformité supplémentaires nécessaires à ce module installé (par exemple, les émissions de
périphériques numériques, les exigences de périphériques PC, etc.)
IMPORTANT NOTE:
In the event that these conditions cannot be met (for example certain laptop configurations
or co‐location with another transmitter), then the Canada authorization is no longer
considered valid and the IC ID cannot be used on the final product. In these circumstances,
the OEM integrator will be responsible for re‐evaluating the end product (including the
transmitter) and obtaining a separate Canadian authorization.
NOTE IMPORTANTE:
Dans le cas où ces conditions ne peuvent être satisfaites (par exemple pour certaines
configurations d'ordinateur portable ou de certaines co‐localisation avec un autre
émetteur), l'autorisation du Canada n'est plus considéré comme valide et l'ID IC ne peut pas
être utilisé sur le produit final. Dans ces circonstances, l'intégrateur OEM sera chargé de
réévaluer le produit final (y compris l'émetteur) et l'obtention d'une autorisation distincte
au Canada.
Le produit final doit être étiqueté dans un endroit visible avec l'inscription suivante: " GEM
2 Module Contient des IC: TBD"
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CE
The GEM 2 Module has been tested against the appropriate regulatory standards for
European market. OEMs should consult a qualified test house to ensure theirproductmeets
all regulatory requirements.
The GEM Module Declaration of Conformities is below. Test reports are available upon
request.
Health and Safety – EN60950‐1: 2006+A11:2009+A1:2010+A12:2011
Electromagnetic compatibility – EN301489‐17 Vx.x.x in accordance with EN 301 489‐1
V1.8.1
Radio Frequency Radiated Emissions: EN300 328 V1.8.1
Wahoo Fitness declares under our sole responsibility that the essential radio tests have
been carried out and that the GEM Module to which this declaration relates isinconformity
with all applicable essential requirements of Article 3 of the EU Directive 1999/5/EC when
used for its intended purpose.
Place of Issue: Wahoo Fitness LLC
90 W. Wieuca Road Suite 110
Atlanta, GA 30342
+1(877) 978‐1112
Date: April, 2016
Authorized Person: James Halter
Signature:
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Bluetooth Qualification
The GEM 2 module has been listed with the Bluetooth Special Interest Group (SIG) as a
qualified an End Product. The Wahoo Fitness Declaration ID is: TBD
The Bluetooth SIG requires every product implementing Bluetooth technology to have a
Declaration ID even though the end product references a Bluetooth design with its own
Declaration ID.
An over of the Bluetooth SIG Qualification Process is as follows:
1. Register as a member of the Bluetooth SIG – www.bluetooth.org
2. Go to product listing page https://www.bluetooth.org/en‐us/test‐
qualification/qualification‐overview
3. Go to Create a Listing: https://www.bluetooth.org/tpg/QLI_SDoc.cfm
4. In the area
“
Reference a Qualified Design, Enter End Product ID: xxxxxxxx
5. Select your Declaration ID or Purchase a Declaration ID. Fees for Declaration IDs
vary based on Bluetooth SIG membership level.
6. Once you have completed your listing and paid your declaration fee, your design will
be listed on the Blueooth SIG website.
You can find more details on the Bluetooth SIG listing process at the following webpage:
https://www.bluetooth.org/en‐us/test‐qualification/qualification‐overview
Ordering Details
Part Number Reel Size Shipping Weight MOQ Multiple
GEMSRB02 500 pieces TBD 500 500
Further Assistance
Please contact Wahoo Fitness at 1‐877‐978‐1112 or via email at info@wahoofitness.com if
additional help is needed.