Silicon Laboratories EZR32WG User manual

User Manual
EZR32WG 915MHz Wireless Starter Kit
The WSTK6222 is an excellent starting point to get familiar with
the EZR32 Wonder Gecko Wireless Microcontrollers.
The Wireless Starter Kit Mainboard contains sensors and peripherals demonstrating
some of the Wireless MCU's many capabilities. The kit provides all necessary tools for
developing a Silicon Labs wireless application.
KIT FEATURES
• Ethernet and USB connectivity
• Advanced Energy Monitoring
• Packet Trace Interface support
• SEGGER J-Link OB debugger
• Debug Multiplexer supporting external
hardware as well as radio board
• Silicon Labs' Si7021 Relative Humidity and
Temperature sensor
• Ultra Low power 128x128 pixel Memory
LCD
• LEDs / Pushbuttons / Reset button
• 20pin 2.54mm header for expansion
boards
• Breakout pads for direct access to all radio
I/O pins
• Power sources including USB and CR2032
coin cell holder.
ORDERING INFO
• SLWSTK6222A
RADIO BOARD FEATURES
• EZR32WG330F256R63G MCU with 256
kB Flash and 32 kB RAM.
• SMA antenna connector
• USB Micro-B connector
• Backup domain capcitor
SOFTWARE SUPPORT
• Simplicity Studio
• Simplicity Profiler
• Simplicity Network Analyzer
• Extensive example set for radio
• Kit Board Support Package
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Table of Contents
1. Introduction ................................1
1.1 Description ...............................1
1.2 Kit Content ...............................1
1.3 Getting Started .............................1
2. Kit Block Diagram .............................2
3. Kit Hardware Layout ............................3
4. Power Supply and Reset ...........................4
4.1 MCU Power Selection ...........................4
4.2 Board Controller Power...........................4
4.3 Backup Power Domain ...........................4
4.4 MCU Reset...............................5
4.5 Board Controller Reset ...........................5
5. Peripherals ................................6
5.1 Push Buttons and LEDs ..........................6
5.2 Memory LCD-TFT Display..........................7
5.3 Backup Domain Capacitor..........................7
5.4 USB Micro-B Connector ..........................8
5.5 Si7021 Relative Humidity and Temperature Sensor .................9
6. Advanced Energy Monitor .........................10
6.1 Introduction...............................10
6.2 Advanced Energy Monitor - Theory of operation ..................10
6.3 AEM accuracy and performance........................11
6.4 Usage ................................11
7. Board Controller .............................12
7.1 VCOM ................................12
8. Board Support Package ..........................13
8.1 Application Programming Interface .......................13
8.2 Example Applications ...........................13
8.3 How to include in your own applications .....................13
9. Connectors ...............................14
9.1 Radio Board breakout pads .........................14
9.2 Debug Connector (DBG) ..........................15
9.3 Simplicity Connector............................16
9.4 Expansion header ............................17
10. Integrated Development Environments ....................20
EZR32WG 915MHz Wireless Starter Kit
Table of Contents ii

10.1 IAR Embedded Workbench for ARM ......................20
10.2 Atollic TrueSTUDIO for ARM ........................21
10.3 Rowley Associates - CrossWorks for ARM ....................21
10.4 Keil - MDK-ARM ............................21
11. Kit Manager and Upgrades .........................22
11.1 Kit Manager Operation ..........................22
11.2 Firmware Upgrades ...........................22
12. Schematics, Assembly Drawings and BOM ..................23
13. Kit Revision History and Errata .......................24
13.1 Revision History.............................24
13.2 Errata ................................24
14. Document Revision History ........................25
EZR32WG 915MHz Wireless Starter Kit
Table of Contents iii

1. Introduction
1.1 Description
The idea behind the WSTK6222 is to provide a complete development platform for Silicon Labs EZR32 Wonder Gecko Wireless Micro-
controllers. The core of the WSTK6222 is the Wireless Starter Kit (WSTK) Mainboard (BRD4001) which feature an on-board J-Link de-
bugger, an Advanced Energy Monitor for real-time current and voltage monitoring, a Virtual COM port interface, and access to the
Packet Trace Interface (PTI). The WSTK Mainboard is paired with an EZR32 Wonder Gecko radio board that plugs directly into the
mainboard. The radio board feature the EZR32 Wonder Gecko itself and the RF interface. All debug functionality, including AEM,
VCOM and PTI, can also be used towards an external target instead of the included radio board. To further enhance the WSTK usabili-
ty, the WSTK Mainboard contains sensors and peripherals demonstrating some of the Wireless MCU's many capabilities.
1.2 Kit Content
The following items are contained in the box:
• 2x BRD4001A Wireless Starter Kit Mainboards
• 2x BRD4503B EZR32 Wonder Gecko 915 MHz WSTK Radio Boards
• 2x 915 MHz antennas with SMA connector
• 2x CR2032 Lithium batteries
• 2x USB Type A <-> USB Mini-B cables
• 2x USB Type A <-> USB Micro-B cables
Figure 1.1 WSTK6222 Kit Content on page 1 shows the kit content.
Figure 1.1. WSTK6222 Kit Content
1.3 Getting Started
Detailed instructions for how to get started with your new WSTK6222 can be found on the Silicon Labs Simplicity web pages:
http://www.silabs.com/simplicity
EZR32WG 915MHz Wireless Starter Kit
Introduction
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2. Kit Block Diagram
An overview of the EZR32WG 915MHz Wireless Starter Kit is shown in the figure below.
Figure 2.1. WSTK6222 Block Diagram
EZR32WG 915MHz Wireless Starter Kit
Kit Block Diagram
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3. Kit Hardware Layout
The layout of the EZR32WG 915MHz Wireless Starter Kit is shown below.
On-board USB and
Ethernet J-Link
Debugger
SoC / Radio pin
access headers EZR32 Radioboard
Si7021 Humidity and
Temperature Sensor
EXP-header for
expansion boards
Serial-port, packet trace and Advanced
Energy Monitoring header
ARM Coresight 19-pin
trace/debug header
Ultra-low power 128x128
pixel memory LCD,
buttons and LEDs
Battery or
USB power
USB-serial-port
Packet-trace
Advanced Energy
Monitoring
Figure 3.1. WSTK6222 hardware layout
The kit consists of two BRD4001 Wireless Starter Kit Mainboards paired with two BRD4503B plug-in radio boards with the following
specifications:
• Wireless MCU: EZR32WG330F256R63G
• CPU core: ARM Cortex-M4
• Flash memory: 256 kB
• RAM: 32 kB
• Sub-GHz transceiver integrated in the Wireless MCU: EZRadioPRO
• Operation frequency: 915 MHz
• Transmit power: 20 dBm
• Single antenna connector both for transmit and receive
• Crystals for LFXO and HFXO: 32.768kHz and 48 MHz.
• Crystal for RF: 30 MHz
• Backup Power Domain Capacitor
• Full speed USB 2.0 (12 Mbps)
EZR32WG 915MHz Wireless Starter Kit
Kit Hardware Layout
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4. Power Supply and Reset
4.1 MCU Power Selection
The EZR32 Wonder Gecko MCU on the WSTK6222 is designed to be powered by three different sources:
• Through the on-board debugger.
• Through the EZR32's own USB regulator.
• By a 3V Battery.
Selecting the power source is done with the slide switch in the lower left corner of the board. Figure Figure 4.1 WSTK6222 Power
Switch on page 4 shows how the different power sources can be selected with the slide switch.
3.3V
VMCU
AEM
USB
BAT
USB Mini-B
Connector
Advanced
Energy
Monitor
5V
3V Lithium Battery
(CR2032)
Wireless
MCU USB Micro-B
Connector
USB_VREGI
(5V)
USB_VREGO
(3.3V)
.
BAT
USB
AEM
LDO
Figure 4.1. WSTK6222 Power Switch
With the switch in the DBG position, an on-board low noise LDO with a fixed output voltage of 3.3V is used to power the MCU. This
LDO is again powered from the "J-Link" USB cable. The Advanced Energy Monitor is now also connected in series, allowing accurate
high speed current measurements and energy debugging/profiling.
With the switch in the USB position, the integrated linear regulator in the EZR32 Wonder Gecko MCU is used to power the rest of the
chip as well as the USB PHY. This allows a USB device application where the MCU acts as a bus powered device.
Finally, with the switch in the BAT position, a 20mm coin cell battery in the CR2032 socket can be used to power the device.
Note:
The Advanced Energy Monitor can only measure the current consumption of the EZR32 when the power selection switch is in the DBG
position.
4.2 Board Controller Power
The Board Controller is responsible for important features such as the debugger and the Advanced Energy Monitor, and is powered
exclusively through the USB port in the top left corner of the board. This part of the kit resides on a separate power domain, so a differ-
ent power source can be selected for the MCU while retaining debugging functionality. This power domain is also isolated to prevent
current leakage from the MCU power domain when power to the Board Controller is removed.
4.3 Backup Power Domain
The kit contains a backup capacitor that can be used together with the EZR32 Wonder Gecko's backup power domain. In this case, all
other power sources are removed from the kit, and only a small part of the EZR32 runs off the capacitor. It is also possible to enter
backup mode while the Board Controller is powered by selecting either BAT or USB with no battery in the socket or USB cable in the
connector.
EZR32WG 915MHz Wireless Starter Kit
Power Supply and Reset
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4.4 MCU Reset
The EZR32 MCU can be reset by a few different sources:
• A user pressing the RESET button.
• The on-board debugger pulling the #RESET pin low.
• An external debugger pulling the #RESET pin low.
4.5 Board Controller Reset
The Board Controller can be reset by removing and re-inserting the J-Link USB cable. Removing the Board Controller USB cable will
not reset the EZR32, but whenever the Board Controller is powered up again, it will issue a RESET to the EZR32 through the on-board
debugger.
EZR32WG 915MHz Wireless Starter Kit
Power Supply and Reset
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5. Peripherals
The starter kit has a set of peripherals that showcase some of the features of the EZR32 Wonder Gecko Wireless Microcontroller.
Be aware that most EZR32 I/O routed to peripherals are also routed to the breakout pads. This must be taken into consideration when
using the breakout pads for your application.
5.1 Push Buttons and LEDs
The kit has two user push buttons marked PB0 and PB1. They are connected to the EZR32, and are debounced by RC filters with a
time constant of 1ms. The buttons are connected to pins PC8 and PC9.
In addition to the two push buttons, the kit also features two yellow LEDs marked LED0 and LED1, that are controlled by GPIO pins on
the EZR32. The LEDs are connected to pins PC10 and PC11 in an active-high configuration.
Figure 5.1. Buttons/LEDs
EZR32WG 915MHz Wireless Starter Kit
Peripherals
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5.2 Memory LCD-TFT Display
A 1.28-inch SHARP Memory LCD-TFT has been added to the board to enable interactive applications to be developed. The display has
a high resolution of 128 by 128 pixels, and consumes very little power. It is a reflective monochrome display, so each pixel can only be
light or dark, and no backlight is needed in normal daylight conditions.
The display interface consists of an SPI-compatible serial interface and some extra control signals. Data is sent to the display one line
(128 bits) at a time.
The Memory LCD-TFT display is shared with the kit Board Controller, allowing the Board Controller application to display useful infor-
mation when the user application is not using the display. The user application always controls ownership of the display with
EFM_DISP_SELECT (PA8):
• 0: The Board Controller has control of the display
• 1: The user application (EZR32) has control of the display
EFM_DISP_PWR (PA10) enables power to the display, and must be set high in order to use the display. Data is clocked in on
EFM_DISP_MOSI (PD7) when EFM_DISP_CS (PE11) is high, and the clock is sent on EFM_DISP_SCLK (PC15). The maximum sup-
ported clock speed is 1.1 MHz.
EFM_DISP_COM (PE10) is the "COM Inversion" line. It must be pulsed periodically to prevent static build-up in the display itself.
Please refer to the display application information for details on driving the display:
http://www.sharpmemorylcd.com/1-28-inch-memory-lcd.html
Figure 5.2. 128x128 pixel Memory LCD
5.3 Backup Domain Capacitor
A small super capacitor is provided to evaluate the EZR32 Wonder Gecko MCU's backup power domain. The capacitor has a nominal
value of 33 mF, and is connected with a 100 ohm series resistor to the BU_VIN pin of the EZR32.
Because of the extremely low power consumption of the EZR32 in backup mode (400nA), the capacitor can power a clock application
using the low frequency crystal oscillator (LFXO) for more than 8 hours.
The series resistor allows measuring of the current drawn from the capacitor into the EZR32 device, by simply using a multimeter to
measure the voltage across it. Please refer to the schematic and assembly drawings to locate the series resistor.
EZR32WG 915MHz Wireless Starter Kit
Peripherals
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