User's Manual

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The Silver Spring Networks Milli 5 is a wireless communications module optimized

for battery-powered devices enabling the Internet of Important Things

. The Milli 5

leverages Silver Spring Networks’ proven, self-forming, self-healing networking

capabilities to bring connectivity to a new class of IoT devices. The small form

factor and power-optimized design brings secure, reliable two-way integrated IPv6

connectivity to critical infrastructure.

Silver Spring Networks Technology

Silver Spring Networks provides autonomous wireless communication to geographically

distributed devices, utilizing on‑board rmware to securely communicate and

interoperate with compatible wireless nodes to form a wireless mesh network.

Silver Spring employs frequency hopping techniques to hop through frequency channels

in unlicensed spectrum available worldwide. Each node “hops” in a pseudo-random

hopping sequence, meaning each node synchronizes with other nodes in order to

communicate on the network. Silver Spring utilizes time-based synchronization based

upon a common time propagated through the network as a resource.

Upon boot-up, Silver Spring devices enter acquisition mode, where they scan the

available frequencies for discovery beacons. The discovery beacon contains the

information necessary to synchronize their frequency-hopping. A host is any device to

which the communications module is connected. A host application is any application

that runs on that host.

Silver Spring Network’s IPv6 mesh is designed to mitigate unnecessary trafc as much

as possible to reduce the probability for interference, excessive noise oor, and other

deleterious RF effects that typically occur when unnecessarily chatty protocols are

used—that is, those with excessive keep-alive, polling, and other messages being

broadcast continually. Each node is capable of dynamically identifying alternate routes

KEY BENEFITS

» Integrates with Silver Spring

Networks mesh networking

technology

» Long range

» Low power (+23dBm output

power) and small form factor

» Support for IPv6, RFC 7252

Constrained Application

Protocol (CoAP), and Wi-SUN

802.15.4g radio

» Security with standard

cryptographic algorithms and

PKI-based implementation

» Bi-directional communications

» OTA rmware updates

MILLI

PRODUCT DATA SHEET

Summary of content (18 pages)

PAGE 1
MILLI 5 TM PRODUCT DATA SHEET KEY BENEFITS »» Integrates with Silver Spring Networks mesh networking technology »» Long range »» Low power (+23dBm output power) and small form factor »» Support for IPv6, RFC 7252 Constrained Application Protocol (CoAP), and Wi-SUN 802.15.4g radio The Silver Spring Networks Milli 5 is a wireless communications module optimized for battery-powered devices enabling the Internet of Important ThingsTM.
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SPECIFICATIONS Radio and Networking Capabilities if required due to outages, link failures or other conditions. This leads to an extremely resilient network topology compared to other star topologies. »» Operates in 870-875.
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Physical Specifications Parameter Value Size 30x25x2.5mm Weight 5g (approximately) Package Type LGA – 72 pins Material PCB Board Electrical Specifications This section contains electrical specifications for Milli 5. Note: All specifications are subject to change without notice. Absolute Maximum Ratings: Under no circumstances must the absolute maximum ratings be violated. Stress exceeding one or more of the limiting values may cause permanent damage to the device.
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Power Consumption Parameter Typ Max Unit Conditions Sleep/Power-down ~ 10 μA target goal (RTC and SRAM retention) - μA 32 kHz clock running, MCU register retention, full RAM retention RF channel sense ~2 - mA - Power Consumption Radio RX 7 - mA RX sniff mode, searching for packet Power Consumption Radio TX 172 200 mA - Receive Parameters Parameter Min Typ Max Units Conditions (870 - 875.
PAGE 5
Signal Interface The Silver Spring Networks Milli 5 is an SMT reflow Land Grid Array (LGA) module with I/O and power connections at the bottom.
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Mechanical Specifications Note: The ground pads on the module’s bottom side must be connected to electrical and thermal performance. 1 2 3 4 SILVER SPRING NETWORKS PROPRIETARY INFORMATION 5 6 7 CHANGE NUMBER REV 22.750 19.250 15.750 12.250 8.750 5.250 A 8 REVISIONS THIS DRAWING HAS BEEN GENERATED BY A CAD SYSTEM. CHANGES SHALL ONLY BE INCORPORATED AS DIRECTED BY THE DESIGN ACTIVITY. DO NOT REVISE MANUALLY. THIS DOCUMENT IS THE SOLE PROPERTY OF SILVER SPRING NETWORKS.
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Pin Assignments and Signal Description The Milli 5 module provides connecting pads to integrate the module into external applications. Figure below shows the pin assignments and Table 1 lists the pins and signal descriptions. Note that pin assignments are preliminary and might change at a later date. Pin assignments Note: Pins marked “NC” (no connect) can be soldered but must be left open, and not be connected to an external application. It is highly recommended that all pads be soldered.
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Pins and signal descriptions Pin Number Signal Name Input/Output Description 1 3V3 Power 3.1V - 3.
PAGE 9
Pin Number Signal Name Input/Output Description 33 NC N/A NC 34 GND Power Ground 35 NC N/A NC 36 NC N/A NC 37 GPIO_5 I/O Interrupt pin – Pin to wake up host processor from Milli 5 38 NC N/A NC 39 GPIO_8 Output Is an open collector pin that Milli 5 would pull low to affect the host device to reset.
PAGE 10
50 ohm PCB Design Guidelines Antenna design and RF layout are critical in a wireless system that transmits and receives electromagnetic radiation in free space. The Milli 5 module does not include an antenna connector. The antenna (or unique antenna connector) must be connected to Milli 5 via a transmission line implemented on the host PCB. SSN recommends the use of a co-planer Waveguide to minimize space and board real estate. The PCB trace should be kept as short as possible to minimize path loss.
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PCB Design Guidelines; Silver Spring Networks Milli 5 Development Board Layout Antenna trace design parameters PCB Stackup
PAGE 12
Coplanar Waveguide with Full Ground Pour Coplanar Waveguide with ground outline showing vias 50 mils spaced
PAGE 13
Transmission Line Measurements For design verification, use of an S-Parameter Network Analyzer, such as Agilent 8719S may be used to characterize the losses of the transmission line. Solder a calibrated coaxial cable to pin 16 (RF900, RF I/O port) pin on the PCB to make the following measurements. Path loss measurements, S12. Line input impedance (Smith chart format) once the line has been terminated with a 50 ohm load is shown below.
PAGE 14
FCC AND INDUSTRY CANADA GOVERNMENT GUIDELINES Silver Spring Networks Milli 5 FCC ID: OWS-MIL51 IC: 5975A-MIL51 Modifications Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment. Part 15 Certification Notice This device complies with Part 15 of the FCC Rules and Industry Canada licence-exempt RSS standard(s). Operation is subject to the following two conditions: 1.
PAGE 15
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. L’antenne de cet émetteur ne doit pas se trouver à proximité de ou fonctionner en association avec une autre antenne ou un autre émetteur.
PAGE 16
L’extrait suivant provient du Cahier des charges sur les normes radioélectriques (CNR); exigences générales et information relatives à la certification des appareils radio, section 3.2.1, et décrit les exigences en matière d’étiquetage pour un dispositif hôte intégrant un module radio. Le dispositif hôte doit être correctement étiqueté afin d’identifier les modules qu’il comprend.
PAGE 17
gain should be so chosen that the equivalent isotropically radiated power (e.i.r.p.) is not more than that necessary for successful communication. Conformément à la réglementation d’Industrie Canada, le présent émetteur radio peut fonctionner avec une antenne d’un type et d’un gain maximal (ou inférieur) approuvé pour l’émetteur par Industrie Canada.
PAGE 18
Option 2: If all rules from Option 1 are used, but a different type of antenna is required for the application, request a Change in ID application to reuse data from the current FCC/IC Grant, then apply for a Class 2 Permissive Change to add the antenna. The integration would require some additional conformity against CFR 47 Parts 15.203, 15.209, and RF exposure to add antenna to the Certification. Contact Silver Spring Networks for authorization to apply for a Class II Permissive Change.