6. Hardware
This section describes the key aspects of the reference design.
6.1 ZigBee Smart Outlet Reference Design
The reference design is composed of three printed circuit boards:
• RF board
• Sensor board
• Power board
The RF board mounts on the power board via connectors. The sensor board mounts to the power board with a ribbon cable connector.
6.1.1 RF Board Highlights
• ERF32MG ZigBee Pro radio with an embedded flash
• Cirrus Logic CS5463 energy monitoring IC
• Printed circuit board antenna
• Mini-simplicity header debug connector
6.1.2 Sensor Board Highlights
• Si7021 temperature and humidity sensor
• Si1141 ambient light sensor
• Momentary push button
6.1.3 Power Board Highlights
• TI UCC28700DBV constant voltage, constant current, fly-back controller
• TI LM3671MF switching regulator 3.3 V, 600 mA
• TE Connectivity 8-1393239-5 SPDT relay 250 VAC, 16 A
• Diodes Incorporated RH06-T bridge rectifier 600 V, 0.5 A
• Renco RLTI-1072 transformer 40:3, 2A
• Bel Fuse slow blow fuse 250 V, 0.5A
• Green and red LEDs
6.2 Hardware Modification Guidelines
For users who wish to modify the reference design, we offer guidelines below for what to expect in the modification process.
6.2.1 Avoid Modification
All changes listed here may have serious impacts on performance or certification passage such as FCC or UL:
• Modifying the spacing between the EM3587, FEM and the PCB antenna.
• Modifying the high voltage sections of the power board.
• Changing the PCB antenna length/shape.
• Changing any part of the ground pour area.
6.2.2 Bill of Material Cost-saving Options
To further reduce overall bill-of-material (BOM) cost of this reference design, the following items and their supporting circuitry can be
considered for removal:
• Mini-simplicity programming header.
• CS5463 and its supporting energy monitoring circuitry.
• Si1141 ambient light sensor.
• Si7021 temperature and humidity sensor.
UG171: ZigBee
®
Smart Outlet Reference Design (RD-0051-0201) Kit User's Guide
Hardware
silabs.com
| Smart. Connected. Energy-friendly.
Rev. 0.1 | 10
