Silicon Laboratories ZigBee Manuale utente
UG171: ZigBee® Smart Outlet Reference
Design (RD-0051-0201) Kit User's Guide
Silicon Labs' compact and cost-effective smart outlet reference design is based on Zig-
Bee HA (Home Automation) 1.2 standard and can be used in conjunction with a ZigBee
HA 1.2 home automation system. This reference design kit features Silicon Labs’
EFR32MG1P232F256GM48 ZigBee Pro Wireless Microcontroller (MCU), the Si7021
temperature and relative humidity sensor, and the Si1141 ambient light sensor. This
document contains instructions and guidelines for the following: a quick-start demon-
stration and next steps, system overview and operations, hardware and firmware con-
siderations, and engineering and manufacturing testing.
This guide applies to EmberZNet PRO 5.8 and later.
KEY POINTS
• Quick start demonstration
• Recommended next steps
• Kit overview
• Device operation
• HA 1.2 and FCC certifiable
• Hardware and Firmware Considerations
• Ecosystem considerations
• Engineering and Manufacturing Testing
silabs.com | Smart. Connected. Energy-friendly. Rev. 0.1
1. Introduction
There is an increasing desire in the market for a standards-driven, low-cost, and low-power wireless home automation system. For
many entrant systems a smart outlet is usually employed to remotely activate and deactivate the source power feeding into room
lamps, personal fans, and consumer electronics. In addition to home automation, consumers are employing an array of low-cost sen-
sors to further enhance their home automation’s autonomous behavior. Silicon Labs has developed a compact and cost-effective smart
outlet reference design targeted at these applications. This reference design (see the following figure) features Silicon Labs’
EFR32MG1P232F256GM48 ZigBee Pro Wireless Microcontroller (MCU), the Si7021 temperature and relative humidity sensor. and the
Si1141 ambient light sensor. The outlet also features voltage, current, and power measurement capability, as well as current and ther-
mal overload shutdown features. The reference design can be directly integrated into a connected ZigBee home automation applica-
tion, as shown in Figure 1.2 ZigBee Home Automation with Smart Outlets on page 1. The reference design comes preprogrammed
and fully functional out of the box. All hardware design files and firmware application source code are available.
Figure 1.1. ZigBee Smart Outlet Reference Design
ZigBee HA 1.2
Gateway
ZigBee
Smart
Outlet
ZigBee
Smart
Outlet
ZigBee
Smart
Outlet
Figure 1.2. ZigBee Home Automation with Smart Outlets
UG171: ZigBee® Smart Outlet Reference Design (RD-0051-0201) Kit User's Guide
Introduction
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2. Quick Start Demonstration
A video showing the quick-start demonstration is available at http://www.silabs.com/zigbeesmartoutlet.
1. Set up an HA 1.2 ZigBee gateway.
2. Supply power to the ZigBee Smart Outlet.
a. Ensure the reference design is connected to a main power source. Note that the outlet power supply is rated to 240 VAC,
however, the the North American plug is rated to 120 VAC.
b. The reference design is powered when the green LED momentarily flashes at least once.
3. Connect the ZigBee Smart Outlet to the ZigBee network.
a. Follow the directions provided with the ZigBee gateway to enable the smart outlet reference design to join its ZigBee network.
b. Depress and hold external front button for more than three seconds, then release to begin the network join procedure.
c. The outlet has joined the ZigBee network when the green LED blinks six times.
4. Demonstrate ZigBee Smart Outlet functionality.
a. Send an “on” command from the gateway to the smart outlet. This should cause an audible click to occur (from the internal
relay), the red LED will blink once and power will be applied to the front female plug outlet.
b. Send an “off” command from the gateway to the smart outlet. This should cause an audible click to occur (from the internal
relay), the red LED will blink once and power will be removed to the front female plug outlet.
c. To manually provide or remove power from the female front outlet, hold the front button for more than half a second, but less
than two seconds to toggle between states.
d. If supported by the gateway, the on-board sensors on the reference design can be viewed by the user interface of the gate-
way.
UG171: ZigBee® Smart Outlet Reference Design (RD-0051-0201) Kit User's Guide
Quick Start Demonstration
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3. Recommended Next Steps
A video showing the recommended next steps is available at http://www.silabs.com/zigbeesmartoutlet.
3.1 Evaluate the Smart Outlet
The ZigBee smart outlet reference design can support most smart power outlet application requirements. Typical areas of evaluation
include:
1. ZigBee network behavior, such as network join and leave.
2. Deploying on-off commands remotely.
3. Measuring energy consumption of the controlled load.
4. Monitoring ambient temperature, humidity, and ambient light.
5. RF performance, such as range.
3.2 Evaluate the Firmware
If firmware modification is needed to support your application:
1. Visit the ZigBee Getting Started page and order a development kit.
2. Refer to Section 7. Firmware of this document.
3.3 Build Proof of Concept
Out of the box, the smart outlet reference design can be used for a rapid proof of concept. One can demonstrate the look, feel, and
function of a final product. Refer to Section 7. Firmware to change functional behavior, such as LED blinking or button functionality.
3.4 System Integration
Section 6. Hardware of this document describes the considerations for integrating the reference design into a typical application. Often
the reference design can be designed into a system without modification. In cases where a change is required, the hardware section of
this document also offers modification guidelines.
3.5 Engineering and Manufacturing Tests
Section 9. Engineering Tests of this document provides engineering test information for UL, such as FCC and HA 1.2.
Section 10. Manufacturing Tests of this document offers considerations for simplified manufacturing tests.
3.6 Manufacturing
Please contact Silicon Labs to access our manufacturing partner network for the reference design, or a modified version of the design.
UG171: ZigBee® Smart Outlet Reference Design (RD-0051-0201) Kit User's Guide
Recommended Next Steps
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4. Overview
4.1 Part Numbers
The part number convention is RD-XXXX-YYYY, where:
RD Reference Design
XXXX Reference Design Number
YYYY Reference Design Component
This document will use the reference design number (RD-XXXX) when describing the complete design, and the reference design com-
ponent (RD-XXXX-YYYY) when describing a specific component.
The following table provides a description and PCB marking for each part number.
Note: Some cases lack sufficient space on the PCB, and an internal “IST” marking appears on the PCB instead of the “RD” part num-
ber.
Table 4.1. Part Numbers and Description
Part Number PCB Marking Description
RD-0051-0201 NA ZigBee Smart Outlet Reference Design Kit with North America plug using
EFR32MG1P232F256GM48, Si7021, Si1141 and PCB Antenna.
RD-0051-0101 IST-A0081 rev 2.0
(Power Board)
IST-A0074 rev 4.0
(Radio Board)
IST-A0075 rev 2.0
(Sensor Board)
ZigBee Smart Outlet Reference Design Evaluation Board with North America
plug using EFR32MG1P232F256GM48, Si7021, Si1141 and PCB Antenna.
4.2 ZigBee Smart Outlet Reference Design Kit
Kit Contents:
• ZigBee smart outlet reference design.
• Quick start card to obtain the latest reference design collateral.
UG171: ZigBee® Smart Outlet Reference Design (RD-0051-0201) Kit User's Guide
Overview
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4.3 ZigBee Smart Outlet Reference Design
This reference design contains many features for the evaluation of a smart outlet, including:
Table 4.2. ZigBee Smart Outlet Reference Design Features
Reference Design Features Benefit
15 A power relay Allows for power control of most household electronic products.
Energy monitoring circuit Provides power, voltage and current status of a device being powered by the refer-
ence design.
Temperature and relative humidity sensor Provides room environmental sensing capability.
Ambient light sensor Provides room lighting status information in proximity to the reference design.
Network status LED Provides feedback on the RF network status.
Power status LED Provides feedback on the power circuitry.
10-pin Mini Simplicity Connector Facilitates ZigBee packet trace and debugging.
User button Eases network commissioning (join/leave) and manual power override.
Test points Simplifies hardware-level debugging.
4.4 Hardware Features
The smart outlet hardware reference design contains the following features:
• Silicon Labs EFR32MG1P232F256GM48 ZigBee Pro Radio:
• 32-bit ARM® Cortex -M4 with DSP and FPU
• 2.4-GHz IEEE 802.15.4-2003 transceiver & lower MAC.
• Hardware Cryptographic Acceleration for AES 128/256, SHA-1, SHA-2 (SHA-224 and SHA-256) and ECC.
• 256 kB user programmable flash with 64 kB RAM.
• Flexible ADC, UART/SPI/I2C serial communications, and general purpose timers.
• Highly efficient Thumb-2 instruction set.
• Silicon Labs Si7021 relative humidity and temperature sensor:
• Temperature sensor accuracy: ±0.4 °C
• Humidity sensor accuracy: ±3% RH
• I2C interface
• Silicon Labs Si1141 ambient light sensor:
• Ambient light sensor range: 1 to 128 kilo lux
• I2C interface
• Additional hardware features:
• Integrated PCB antenna.
• Energy monitoring device
• Full packet trace port for RF communications debugging.
• Pushbutton for manual on-off power and network join.
• Green Network/status LED.
• Red power status LED.
• Fully qualified BOM for 0 to 55 ºC operation.
• Pre-certified FCC Part 15.
• Pre-certified UL.
UG171: ZigBee® Smart Outlet Reference Design (RD-0051-0201) Kit User's Guide
Overview
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4.5 Firmware Features
The reference design firmware application contains the following features:
• Pre-compiled and source application firmware.
• Over-the-Air (OTA) upgradable.
• ZigBee HA 1.2 pre-certifiable clusters: Basic, Identify, On/Off, Metering, Temperature Measurement, Electrical Measurement, Diag-
nostics, and OTA Cluster.
•Application firmware (source code) available in the EmberZNet™ PRO stack library 5.8.0 and later.
UG171: ZigBee® Smart Outlet Reference Design (RD-0051-0201) Kit User's Guide
Overview
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5. Operation
Three types of button presses are defined. A short button press is less than 500ms, a medium button press is 500ms to 2 seconds, and
a long press is greater than 3 seconds. In cases where more than one short button press is required, there may be no more than two
seconds between each press.
5.1 Outlet Behavior
5.1.1 Remote Control
The ZigBee smart outlet reference design utilizes a 15A controllable relay to manually or remotely toggle power to a device connected
to the front female outlet of the device. If it receives an “on” command from the gateway it will close the relay contact to supply power to
the load. If it receives an “off” command from the gateway it will open the relay contact to prevent power to the load. When the outlet
changes state from off to on the red LED will turn on for one second. When the outlet changes state from on to off the red LED will turn
on for 250 ms.
5.1.2 Manual Control
The state of the outlet may be toggled with medium press of the button. When the outlet changes state from off to on the red LED will
turn on for one second. When the outlet changes state from on to off the red LED will turn on for 250 ms.
5.1.3 Overload Protection and Indication
The switch features current and thermal overload protection and indication. If current or thermal overload is detected the outlet will disa-
ble power. For current overload indication the red LED will blink 250 ms on and 750 ms off, for two minutes. For thermal overload indi-
cation the red LED will blink 250 ms on and 250 ms off, for two minutes. If the overload condition is still present after the two minute
indication, the cycle will repeat.
5.1.4 AC Power Sensing and Energy Measurements
The reference design uses a Cirrus Logic CS5463 power/energy IC is used to measure various attributes of the mains power input.
While the device provides an array of attributes, the following data is collected by this reference design as they are relevant for a low-
cost, smart outlet:
• RMS Voltage
• RMS Current
• Active Power
• AC Alarms Mask
• AC Voltage Overload
• AC Current Overload
• AC Active Power Overload
UG171: ZigBee® Smart Outlet Reference Design (RD-0051-0201) Kit User's Guide
Operation
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5.2 ZigBee Network Behavior
This section describes the various operational states that the smart outlet reference design is able to occupy as it joins and leaves a
ZigBee network. The input mechanism for operation utilizes the external push button. The green LED and red LED operates as output
signaling information as the reference design traverses or occupies a functional state.
Figure 5.1. Device Operation State Diagram
5.2.1 Power-up
After the hardware has been powered for the first time, the device will be in a factory default mode and will be placed in the ACTIVE
NTWK SEARCH state. If the reference design successfully joins a network and is powered off at a later time, upon re-powering, it will
return to the ON NETWORK state.
5.2.2 OFF NETWORK State
This state is a condition where the design is not connected to a network and is not searching for a network. To leave this state and
enter the ACTIVE NTWK SEARCH state, press the button one time.
5.2.3 ACTIVE NTWK SEARCH State
This state is a condition where the reference design is actively searching for a network but has not yet joined a network. While in this
mode, the green LED will flash once every two seconds. This operation of actively searching for a network will remain for up to 20
scans of the band, or approximately 160 seconds. If no network is found, the reference design will enter into the OFF NETWORK state.
Power-cycling or a button press while in this state will reset the timer, while keeping the reference design in this state. If a joinable
network is found it will leave this state and enter the NETWORK JOIN state.
5.2.4 NETWORK JOIN State
After leaving the ACTIVE NTWK SEARCH state and entering this state, the green LED will flash six times in three seconds to indicate
successfully finding and joining a network. This state is temporary and will place the reference design into the ON NETWORK state
once the green LED completes its flash sequence.
UG171: ZigBee® Smart Outlet Reference Design (RD-0051-0201) Kit User's Guide
Operation
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5.2.5 ON-NETWORK State
The ON-NETWORK state is a condition where the smart outlet reference design is connected to a ZigBee network and is not searching
for another network. This state contains multiple entry and exit paths depending on various factors.
If power to the reference design is removed and later restored, the reference design will not seek other networks unless the user forces
it to leave its joined network (as will be described within this section).
If the button is short-pressed once for more than three seconds, the reference design will enter the LEAVE NETWORK state.
If the button is short-pressed two times, the reference design will temporarily enter the IDENTIFY state while remaining on its joined
network.
If the button is short-pressed three times, the reference design will temporarily enter the NETWORK STATUS state while remaining on
its joined network.
If the button is short-pressed five times, the reference design will enter the NETWORK IDENTIFY state.
5.2.6 IDENTIFY State
The purpose of this state is to help an installer (or user) identify which device is communicated to by visually flashing the green LED in
a specified pattern to locate the targeted device. After the reference design leaves the ON-NETWORK state and enters this state, the
green LED will flash twice every two seconds for two minutes. This state is temporary, and the reference design will return to the ON-
NETWORK state once the state’s timer reaches its time limit.
5.2.7 NETWORK STATUS State
The purpose of this state is to help an installer (or user) to identify if a device is successfully connected to a network. After the reference
design leaves the ON-NETWORK state and enters this state, the green LED will flash six times in three seconds if on a network. This
state is temporary, and the reference design will return to the ON-NETWORK state.
5.2.8 SEND IDENTIFY State
The purpose of the SEND IDENTIFY state is to send an identify request to a gateway. It is then up to the gateway to react as desired to
the request.
5.2.9 LEAVE NETWORK State
Upon entering this state, the smart outlet reference design will leave the joined network and will indicate this process is in action by
flashing the green LED three times in three seconds. This state is temporary and will place the reference design into the ACTIVE
NTWK SEARCH state once the LED completes its flash sequence.
UG171: ZigBee® Smart Outlet Reference Design (RD-0051-0201) Kit User's Guide
Operation
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