Ug195 Brd4502a User Guide

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UG195: EZR32LG 868 MHz 13 dBm
Radio Board User's Guide
A Wireless Starter Kit with the BRD4502A Radio Board is an ex-
cellent starting point to get familiar with the EZR32™ Leopard
Gecko Wireless Microcontroller, and it provides all necessary tools
for developing a Silicon Labs wireless application.
BRD4502A is a plug-in board for the Wireless Starter Kit Mainboard. It is a complete ref-
erence design for the EZR32LG Wireless MCU, with matching network for 13 dBm out-
put power, and an SMA connector for the 868 MHz band. The radio board also features
a USB Micro-B connector with device mode support and a super capacitor to be used as
a backup power source.
The Wireless Starter Kit Mainboard contains an on-board J-Link debugger with a Packet
Trace Interface and a Virtual COM port, enabling application development and debug-
ging the attached radio board as well as external hardware. The Mainboard also con-
tains sensors and peripherals for easy demonstration of some of the EZR32's many ca-
pabilities.
This document describes how to use the BRD4502A Radio Board together with a Wire-
less Starter Kit Mainboard.
BRD4502A RADIO BOARD FEATURES
• EZR32 Leopard Gecko Wireless MCU
with 256 kB Flash, and 32 kB RAM.
(EZR32LG330F256R60G)
• 13 dBm output power
• SMA connector for 868 MHz RF
• USB 2.0 Full Speed (12 Mbps) Device
Mode
• Backup power domain capacitor
WIRELESS STK MAINBOARD FEATURES
• Advanced Energy Monitor
• Packet Trace Interface
• Virtual COM Port
• SEGGER J-Link on-board debugger
• External device debugging
• Ethernet and USB connectivity
• Silicon Labs Si7021 Relative Humidity and
Temperature sensor
• Low Power 128x128 pixel Memory LCD
• User LEDs / Pushbuttons
• 20-pin 2.54 mm EXP header
• Breakout pads for Wireless MCU I/O
• CR2032 coin cell battery support
SOFTWARE SUPPORT
• Simplicity Studio™
• Energy Profiler
ORDERING INFORMATION
• SLWRB4502A
silabs.com | Building a more connected world. Rev. 2.01
Table of Contents
1. Introduction ................................4
1.1 Radio Boards ..............................4
1.2 Ordering Information ...........................4
1.3 Getting Started .............................4
2. Hardware Overview .............................5
2.1 Hardware Layout .............................5
2.2 Block Diagram..............................6
3. Connectors ................................7
3.1 J-Link USB Connector ...........................7
3.2 Ethernet Connector ............................7
3.3 Breakout Pads .............................8
3.4 Expansion Header ............................9
3.4.1 Expansion Header Pin-out .......................10
3.5 Debug Connector.............................11
3.6 Simplicity Connector............................12
3.7 Debug Adapter .............................13
4. Power Supply and Reset .......................... 14
4.1 Radio Board Power Selection ........................14
4.2 Board Controller Power...........................14
4.3 EZR32 Reset ..............................15
5. Peripherals ............................... 16
5.1 USB Micro-B Connector ..........................16
5.2 Push Buttons and LEDs ..........................16
5.3 Memory LCD-TFT Display..........................17
5.4 Si7021 Relative Humidity and Temperature Sensor .................18
5.5 Virtual COM Port .............................19
5.5.1 Host Interfaces ...........................20
5.5.2 Serial Configuration ..........................20
5.5.3 Hardware Handshake .........................21
6. Board Controller ............................. 22
6.1 Admin Console .............................22
6.1.1 Connecting .............................22
6.1.2 Built-in Help ............................22
6.1.3 Command Examples .........................23
6.2 Virtual UART ..............................23
7. Advanced Energy Monitor ......................... 24
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7.1 Introduction...............................24
7.2 Theory of Operation ............................24
7.3 AEM Accuracy and Performance .......................25
7.4 Usage ................................25
8. On-Board Debugger ............................ 26
8.1 Host Interfaces .............................26
8.1.1 USB Interface ............................26
8.1.2 Ethernet Interface ..........................26
8.1.3 Serial Number Identification .......................26
8.2 Debug Modes ..............................27
8.3 Debugging During Battery Operation ......................28
9. Kit Configuration and Upgrades ....................... 29
9.1 Firmware Upgrades ............................29
10. Schematics, Assembly Drawings, and BOM .................. 30
11. Kit Revision History ........................... 31
11.1 SLWRB4502A Revision History .......................31
11.2 SLWSTK6200A Revision History .......................31
12. Document Revision History ........................ 32
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1. Introduction
The EZR32LG Leopard Gecko Wireless MCU itself is featured on a Radio Board that forms a complete reference design, including the
RF section and other components.
The Radio Board plugs directly into a Wireless Starter Kit Mainboard. The Mainboard features several tools for easy evaluation and
development of wireless applications. An on-board J-Link debugger enables programming and debugging on the target device over
USB or Ethernet. The Advanced Energy Monitor (AEM) offers real-time current and voltage monitoring. A virtual COM port interface
(VCOM) provides an easy-to-use serial port connection over USB or Ethernet. The Packet Trace Interface (PTI) offers invaluable debug
information about transmitted and received packets in wireless links.
All debug functionality, including AEM, VCOM and PTI, can also be used towards external target hardware instead of the attached radio
board.
To further enhance its usability, the Mainboard contains sensors and peripherals demonstrating some of the many capabilities of the
EZR32LG.
1.1 Radio Boards
A Wireless Starter Kit consists of one or more mainboards and radio boards that plug into the mainboard. Different radio boards are
available. Each featuring different Silicon Labs devices with different operating frequency bands.
Since the mainboard is designed to work with all different radio boards, the actual pin mapping from a device pin to a mainboard feature
is done on the radio board. This means that each radio board has its own pin mapping to the Wireless Starter Kit features such as
buttons, LEDs, the display, the EXP header and the breakout pads. Because this pin mapping is different for every radio board, it is
important that the correct document be consulted which shows the kit features in context of the radio board plugged in.
This document explains how to use the Wireless Starter Kit when the EZR32LG 868 MHz 13 dBm Radio Board (BRD4502A) is com-
bined with a Mainboard. The combination of these two boards is hereby referred to as a Wireless Starter Kit (Wireless STK).
1.2 Ordering Information
BRD4502A can be obtained as a separate radio board SLWRB4502A.
Table 1.1. Ordering Information
Part Number Description Contents Notes
SLWRB4502A EZR32LG 868 MHz 13 dBm Radio
Board
1x BRD4502A EZR32LG 868 MHz 13 dBm Radio Board
1x 868 MHz dipole antenna (Linx ANT-868-CW-HWR-SMA)
SLWSTK6200A EZR32LG 868 MHz Wireless Starter Kit 2x BRD4001A Wireless Starter Kit Mainboard
2x BRD4502A EZR32LG 868 MHz 13 dBm Radio Board
2x 868 MHz dipole antenna (Linx ANT-868-CW-HWR-SMA)
2x USB Type A to Micro-B cable
2x USB Type A to Mini-B cable
Discontinued
1.3 Getting Started
Detailed instructions for how to get started can be found on the Silicon Labs web pages:
http://www.silabs.com/ezr32
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Introduction
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2. Hardware Overview
2.1 Hardware Layout
The layout of the EZR32LG 868 MHz 13 dBm Wireless Starter Kit is shown in the figure below.
On-board USB and
Ethernet J-Link
Debugger
Radio Board Breakout Pads Plug-in Radio Board
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 2.1. Kit Hardware Layout
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Hardware Overview
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2.2 Block Diagram
An overview of the EZR32LG 868 MHz 13 dBm Wireless Starter Kit is shown in the figure below.
USB Micro-B
Connector
RF
Debug
USB Mini-B
Connector
UART
RJ-45 Ethernet
Connector
Packet Trace
AEM
Multiplexer
Debug
UART
ETM Trace
Packet Trace
AEM
Debug
UART
Packet Trace
AEM
Simplicity
Connector
Debug
Connector
Board
Controller
OUT
IN
MCU
EZR32LG
Wireless MCU
ETM Trace
128 x 128 pixel
Memory LCD
I2C
Si7021
Temperature
& Humidity
Sensor
GPIO
EXP
Header
User Buttons
& LEDs
GPIO
SMA
Connector
Figure 2.2. Kit Block Diagram
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Hardware Overview
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3. Connectors
This chapter gives you an overview of the Wireless STK Mainboard connectivity. The placement of the connectors can be seen in the
figure below.
Simplicity
Connector
In/Out Debug
Header
GND
GND
5V
5V
P25
P24
P27
P26
P29
P28
P31
P30
P33
P32
P35
P34
P37
P36
P39
P38
P41
P40
P43
P42
P45
P44
GND
GND
NC
NC
Radio Board
Connectors
Expansion
Header
GND
GND
VMCU
VMCU
P1
P0
P3
P2
P5
P4
P7
P6
P9
P8
P11
P10
P13
P12
P15
P14
P17
P16
P19
P18
P21
P20
GND
GND
P23
P22
VRF
VRF
3V3
3V3
Ethernet
Connector
J-Link USB
Connector
Figure 3.1. Mainboard Connector Layout
3.1 J-Link USB Connector
The J-Link USB connector is situated on the left side of the Wireless Starter Kit mainboard. Most of the kit's development features are
supported through this USB interface when connected to a host computer, including:
• Debugging and programming of the target device using the on-board J-Link debugger
• Communication with the target device over the virtual COM port using USB-CDC
• Accurate current profiling using the Advanced Energy Monitor
In addition to providing access to development features of the kit, this USB connector is also the main power source for the kit. USB 5V
from this connector powers the board controller and the Advanced Energy Monitor. It is recommended that the USB host be able to
supply at least 500 mA to this connector, although the actual current required will vary depending on the application.
3.2 Ethernet Connector
The Ethernet connector provides access to all of the Wireless Starter Kit's development features over TCP/IP. The Ethernet interface
provides some additional development features to the user. Supported features include:
• Debugging and programming of the target device using the on-board J-Link debugger
• Communication with the target device over the virtual COM port using TCP/IP socket 4901
• "VUART" communication with the target device over the debug SWD/SWO interface using TCP/IP socket 4900
• Accurate current profiling using the Advanced Energy Monitor
• Packet Trace interface supports real-time radio packet and network analysis
• The "Admin Console", a telnet console that gives access to advanced configuration options, using TCP/IP socket 4902
Please note that the Wireless Starter Kit cannot be powered using the Ethernet connector, so in order to use this interface, the USB
connector must be used to provide power to the board.
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Connectors
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3.3 Breakout Pads
Most pins of the EZR32 are routed from the radio board to breakout pads at the top and bottom edges of the Wireless STK Mainboard.
A 2.54 mm pitch pin header can be soldered on for easy access to the pins. The figure below shows you how the pins of the EZR32
maps to the pin numbers printed on the breakout pads. To see the available functions on each, please refer to the data sheet for
EZR32LG330F256R60G.
GND
VMCU
P23 / PE2 / BUTTON1
P21 / PF1 / DEBUG_TMS_SWDIO
P19 / PF2 / DEBUG_TDO_SWO
P17 / PF6 / LED0
GND
P15 / PA14 / DISP_ENABLE
P13 / PD6 / SENSOR_I2C_SDA
P11 / PD5
P9 / PD4
P7 / PD3
P5 / PD2 / DISP_SCLK
P3 / PD1
P1 / PD0 / DISP_SI
VRF
GND
VMCU
DISP_EXTCOMIN / PF4 / P22
DEBUG_TCK_SWCLK / PF0 / P20
LED1 / PF7 / P18
VCOM_ENABLE / PA12 / P16
GND
DISP_SCS / PA13 / P14
SENSOR_I2C_SCL / PD7 / P12
PF3 / P10
PB11 / P8
PE1 / P6
PE0 / P4
PC7 / P2
PC6 / P0
VRF
J101
GNDGND
5V5V
NCNC
P45 / PD5 / DEBUG_TRACED3DEBUG_TRACED2 / PD4 / P44
P43 / PD3 / DEBUG_TRACED1DEBUG_TRACED0 / PD6 / P42
P41 / PD7 / DEBUG_TRACECLKUSB_VBUSEN / PF5 / P40
3V33V3
P39 / NCVCOM_TX / PB3 / P38
P37 / PF8 / SENSOR_ENABLEVCOM_RTS / PB6 / P36
P35 / PB5 / VCOM_CTSVCOM_RX / PB4 / P34
P33 / RADIO_RF_GPIO3RADIO_RF_GPIO2 / P32
P31 / PA1 / PTI_SYNCPTI_DATA / PA0 / P30
P29 / NCNC / P28
P27 / NCNC / P26
P25 / NCBUTTON0 / PE2 / P24
GNDGND
J102
Figure 3.2. Radio Board Pin Mapping on Breakout Pads
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3.4 Expansion Header
On the right hand side of the Wireless STK Mainboard an angled 20-pin expansion header is provided to allow connection of peripher-
als or plugin boards. The connector contains a number of I/O pins that can be used with most of the EZR32 Leopard Gecko's features.
Additionally, the VMCU, 3V3 and 5V power rails are also exported.
The connector follows a standard which ensures that commonly used peripherals such as an SPI, a UART and an I2C bus are available
on fixed locations in the connector. The rest of the pins are used for general purpose IO. This allows the definition of expansion boards
that can plug into a number of different Silicon Labs Starter Kits.
The figure below shows the pin assignment of the expansion header. Because of limitations in the number of available GPIO pins,
some of the expansion header pins are shared with kit features.
12
4
8
6
10
3
5
9
7
12
13
14
11
1516
17
18
20 19
VMCU
SPI_MOSI / PD0
SPI_MISO / PD1
SPI_CLK / PD2
SPI_CS / PD3
UART_TX / PD4
UART_RX / PD5
I2C_SDA / PD6
5V
3V3
GND
PC6 / GPIO
PC7 / GPIO
PE0 / GPIO
PE1 / GPIO
PB11 / GPIO
PF3 / GPIO
PD7 / I2C_SCL
Board ID SDA
Board ID SCL
Reserved (Board Identification)
EZR32 I/O Pin
Figure 3.3. Expansion Header
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3.4.1 Expansion Header Pin-out
Many pins on the EZR32 are shared between the Expansion Header and other functions on the Wireless STK Mainboard. Table
3.1 Expansion Header Pinout on page 10 includes an overview of the mainboard features that share pins with the Expansion Header.
Table 3.1. Expansion Header Pinout
Pin Connection EXP Header function Shared feature Peripheral mapping
20 3V3 Board controller supply
18 5V Board USB voltage
16 PD6 I2C_SDA SENSOR_I2C_SDA I2C0_SDA #1
14 PD5 UART_RX LEUART0_RX #0
12 PD4 UART_TX LEUART0_TX #0
10 PD3 SPI_CS USART1_CS #1
8 PD2 SPI_SCLK DISP_SCLK USART1_CLK #1
6 PD1 SPI_MISO USART1_RX #1
4 PD0 SPI_MOSI DISP_MOSI USART1_TX #1
2 VMCU EZR32 voltage domain, included in AEM measurements.
19 BOARD_ID_SDA Connected to Board Controller for identification of add-on boards.
17 BOARD_ID_SCL Connected to Board Controller for identification of add-on boards.
15 PD7 I2C_SCL SENSOR_I2C_SCL I2C0_SCL #1
13 Not connected
11 PB11 GPIO
9 PE1 GPIO
7 PE0 GPIO
5 PC7 GPIO
3 PC6 GPIO
1 GND Ground
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3.5 Debug Connector
The Debug Connector serves multiple purposes based on the "debug mode" setting which can be configured in Simplicity Studio. When
the debug mode is set to "Debug IN", the debug connector can be used to connect an external debugger to the EZR32 on the radio
board. When set to "Debug OUT", this connector allows the kit to be used as a debugger towards an external target. When set to "De-
bug MCU" (default), the connector is isolated from both the on-board debugger and the radio board target device.
Because this connector is electronically switched between the different operating modes, it can only be used when the Board Controller
is powered (i.e. J-Link USB cable connected). If debug access to the target device is required when the Board Controller is unpowered,
connect directly to the appropriate breakout pins.
The pinout of the connector follows that of the standard ARM Cortex Debug+ETM 19-pin connector. The pinout is described in detail
below. Even though the connector has support for both JTAG and ETM Trace, it does not necessarily mean that the kit or the on-board
target device supports this.
1 2
4
8
6
10
5
9
12
13 14
11
15 16
17 18
2019
TMS / SWDIO / C2D
TCK / SWCLK / C2CK
TDO / SWO
TDI / C2Dps
TRACECLK
TRACED0
TRACED1
TRACED2
TRACED3
RESET / C2CKps
GND
NC
NC
GND
GND
GND
7
GND
VTARGET
Cable Detect
NC
3
Figure 3.4. Debug Connector
Note: The pinout matches the pinout of an ARM Cortex Debug+ETM connector, but these are not fully compatible as pin 7 is physically
removed from the Cortex Debug+ETM connector. Some cables have a small plug that prevent them from being used when this pin is
present. If this is the case, remove the plug, or use a standard 2x10 1.27 mm straight cable instead.
Table 3.2. Debug Connector Pin Descriptions
Pin number(s) Function Description
1 VTARGET Target reference voltage. Used for shifting logical signal levels between target and
debugger.
2 TMS / SDWIO / C2D JTAG test mode select, Serial Wire data or C2 data
4 TCK / SWCLK / C2CK JTAG test clock, Serial Wire clock or C2 clock
6 TDO/SWO JTAG test data out or Serial Wire Output
8 TDI / C2Dps JTAG test data in, or C2D "pin sharing" function
10 RESET / C2CKps Target device reset, or C2CK "pin sharing" function
12 TRACECLK PD7 (ETM_TCLK#0)
14 TRACED0 PD6 (ETM_TD0#0)
16 TRACED1 PD3 (ETM_TD1#0)
18 TRACED2 PD4 (ETM_TD2#0)
20 TRACED3 PD5 (ETM_TD3#0)
9 Cable detect Connect to ground
11, 13 NC Not connected
3, 5, 15, 17, 19 GND Ground
Note: Although the on-board debugger and the Debug Connector supports JTAG, the EZR32LG-series of devices do not support JTAG.
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3.6 Simplicity Connector
The Simplicity Connector enables the advanced debugging features, such as the AEM, the Virtual COM port and the Packet Trace In-
terface, to be used towards an external target. The pinout is illustrated in the figure below.
VMCU 1
33V3
5
5V
15
GND
13
GND
11
GND
9
GND
7
GND
17
Board ID SCL
19
Board ID SDA
2VCOM_TX
4VCOM_RX
6VCOM_CTS
8VCOM_RTS
10 PTI0_SYNC
12 PTI0_DATA
14 PTI0_CLK
16 PTI1_SYNC
18 PTI1_DATA
20 PTI1_CLK
Figure 3.5. Simplicity Connector
Note: Current drawn from the VMCU voltage pin is included in the AEM measurements, while the 3V3 and 5V voltage pins are not. To
monitor the current consumption of an external target with the AEM, unplug the Radio Board from the Wireless STK Mainboard to avoid
that the Radio Board current consumption is added to the measurements.
Table 3.3. Simplicity Connector Pin Descriptions
Pin number(s) Function Description
1 VMCU 3.3 V power rail, monitored by the AEM
3 3V3 3.3 V power rail
5 5V 5 V power rail
2 VCOM_TX Virtual COM Tx
4 VCOM_RX Virtual COM Rx
6 VCOM_CTS Virtual COM CTS
8 VCOM_RTS Virtual COM RTS
10 PTI0_SYNC Packet Trace 0 Sync
12 PTI0_DATA Packet Trace 0 Data
14 PTI0_CLK Packet Trace 0 Clock
16 PTI1_SYNC Packet Trace 1 Sync
18 PTI1_DATA Packet Trace 1 Data
20 PTI1_CLK Packet Trace 1 Clock
17 EXT_ID_SCL Board ID SCL
19 EXT_ID_SDA Board ID SDA
7, 9, 11, 13, 15 GND Ground
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3.7 Debug Adapter
BRD8010A STK/WSTK Debug Adapter is an adapter board which plugs directly into the Debug Connector and the Simplicity Connector
on the mainboard and combines selected functionality from these two to a smaller footprint 10-pin connector which is more suitable for
space constrained designs.
For versatility, the Debug Adapter features three different 10-pin debug connectors:
• Silicon Labs Mini Simplicity Connector
• ARM Cortex 10-pin Debug Connector
• Silicon Labs ISA3 Packet Trace
The ARM Cortex 10-pin Debug Connector follows the standard Cortex pin-out defined by ARM and allows the Starter Kit to be used to
debug hardware designs that use this connector.
The ISA3 connector follows the same pin-out as the Packet Trace connector found on the Silicon Labs Ember Debug Adapter (ISA3).
This allows the Starter Kit to be used to debug hardware designs that use this connector.
The Mini Simplicity Connector is designed to offer advanced debug features from the Starter Kit on a 10-pin connector:
• Serial Wire Debug (SWD) with SWO
• Packet Trace Interface (PTI)
• Virtual COM Port (VCOM)
• AEM Monitored voltage rail
Note: Packet Trace is only available on Wireless STK Mainboards. MCU Starter Kits do not support Packet Trace.
VAEM 1
3
RST
5
VCOM_TX
9
PTI_FRAME
7
SWDIO
2GND
4VCOM_RX
6SWO
8SWCLK
10 PTI_DATA
Figure 3.6. Mini Simplicity Connector
Table 3.4. Mini Simplicity Connector Pin Descriptions
Pin number Function Description
1 VAEM Target voltage on the debugged application. Supplied and monitored by the AEM
when power selection switch is in the "AEM" position.
2 GND Ground
3 RST Reset
4 VCOM_RX Virtual COM Rx
5 VCOM_TX Virtual COM Tx
6 SWO Serial Wire Output
7 SWDIO Serial Wire Data
8 SWCLK Serial Wire Clock
9 PTI_FRAME Packet Trace Frame Signal
10 PTI_DATA Packet Trace Data Signal
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4. Power Supply and Reset
4.1 Radio Board Power Selection
The EZR32 on a Wireless Starter Kit can be powered by one of these sources:
• the debug USB cable;
• a 3V coin cell battery; or
• a USB regulator on the Radio Board (for devices with USB support only).
The power source for the radio board is selected with the slide switch in the lower left corner of the Wireless STK Mainboard. shows
how the different power sources can be selected with the slide switch.
3.3 V
VMCU
AEM
USB
BAT
5 V
3 V Lithium Battery
(CR2032) USB Micro-B
Connector
USB_VREGI
(5 V)
USB_VREGO
(3.3 V)
.
BAT
USB
AEM
USB Mini-B
Connector
Advanced
Energy
Monitor
LDO
EZR32
Figure 4.1. Power Switch
With the switch in the AEM position, a low noise 3.3 V LDO on the WSTK Mainboard is used to power the Radio Board. This LDO is
again powered from the debug 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 is used to power the radio board. This allows a USB
device application where the Wireless MCU operates as a bus powered device.
Finally, with the switch in the BAT position, a 20 mm coin cell battery in the CR2032 socket can be used to power the device. With the
switch in this position no current measurements are active. This is the recommended switch position when powering the radio board
with an external power source.
Note: The current sourcing capabilities of a coin cell battery might be too low to supply certain wireless applications.
Note: The Advanced Energy Monitor can only measure the current consumption of the EZR32 when the power selection switch is in
the AEM 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 target device while retaining debugging functionality. This power domain is also isolated to
prevent current leakage from the target power domain when power to the Board Controller is removed.
The board controller power domain is not influenced by the position of the power switch.
The kit has been carefully designed to keep the board controller and the target power domains isolated from each other as one of them
powers down. This ensures that the target EZR32 device will continue to operate in the USB and BAT modes.
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4.3 EZR32 Reset
The EZR32 Wireless 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.
In addition to the reset sources mentioned above, a reset to the EZR32 will also be issued during Board Controller boot-up. This means
that removing power to the Board Controller (unplugging the J-Link USB cable) will not generate a reset, but plugging the cable back in
will, as the Board Controller boots up.
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5. Peripherals
The starter kit has a set of peripherals that showcase some of the features of the EZR32.
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 USB Micro-B Connector
The BRD4502A radio board is equipped with a USB Micro-B connector that is connected directly to the EZR32 Leopard Gecko. Figure
5.1 Radio Board USB Connector on page 16 shows how the USB lines are connected to the EZR32.
Figure 5.1. Radio Board USB Connector
Note: The Radio Board supports operation in USB Device mode only, even if EZR32LG devices also support USB Host mode.
5.2 Push Buttons and LEDs
The kit has two user push buttons marked PB0 and PB1. They are connected directly to the EZR32, and are debounced by RC filters
with a time constant of 1 ms. The buttons are connected to pins PE3 and PE2.
The kit also features two yellow LEDs marked LED0 and LED1, that are controlled by GPIO pins on the EZR32. The LEDs are connec-
ted to pins PF6 and PF7 in an active-high configuration.
PF7 (GPIO)
User Buttons
& LEDs
UIF_LED0
UIF_LED1
UIF_PB0
UIF_PB1
PE3 (GPIO)
PE2 (GPIO)
PF6 (GPIO)
EZR32
Figure 5.2. Buttons and LEDs
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5.3 Memory LCD-TFT Display
A 1.28-inch SHARP Memory LCD-TFT is available on the kit 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. Data sent to the display is stored in the pixels on the glass, which means
no continous refreshing is required to maintain a static image.
The display interface consists of an SPI-compatible serial interface and some extra control signals. Pixels are not individually addressa-
ble, instead 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 the
DISP_ENABLE signal:
• DISP_ENABLE = LOW: The Board Controller has control of the display
• DISP_ENABLE = HIGH: The user application (EZR32) has control of the display
Power to the display is sourced from the target application power domain when the EZR32 controls the display, and from the Board
Controller's power domain when the DISP_ENABLE line is low. Data is clocked in on DISP_SI when DISP_CS is high, and the clock is
sent on DISP_SCLK. The maximum supported clock speed is 1.1 MHz.
DISP_EXTCOMIN 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
PD2 (US1_CLK#1)
PD0 (US1_TX#1)
PA13 (GPIO)
PF4 (GPIO)
PA14 (GPIO)
EZR32
0: Board Controller controls display
1: EZR32 controls display
Figure 5.3. 128x128 Pixel Memory LCD
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5.4 Si7021 Relative Humidity and Temperature Sensor
The Si7021 I2C relative humidity and temperature sensor is a monolithic CMOS IC integrating humidity and temperature sensor ele-
ments, an analog-to-digital converter, signal processing, calibration data, and an I2C Interface. The patented use of industry-standard,
low-K polymeric dielectrics for sensing humidity enables the construction of low-power, monolithic CMOS Sensor ICs with low drift and
hysteresis, and excellent long term stability.
The humidity and temperature sensors are factory-calibrated and the calibration data is stored in the on-chip non-volatile memory. This
ensures that the sensors are fully interchangeable, with no recalibration or software changes required.
The Si7021 is available in a 3x3 mm DFN package and is reflow solderable. It can be used as a hardware- and software-compatible
drop-in upgrade for existing RH/ temperature sensors in 3x3 mm DFN-6 packages, featuring precision sensing over a wider range and
lower power consumption. The optional factory-installed cover offers a low profile, convenient means of protecting the sensor during
assembly (e.g., reflow soldering) and throughout the life of the product, excluding liquids (hydrophobic/oleophobic) and particulates.
The Si7021 offers an accurate, low-power, factory-calibrated digital solution ideal for measuring humidity, dew-point, and temperature,
in applications ranging from HVAC/R and asset tracking to industrial and consumer platforms.
The I2C bus used for the Si7021 is shared with the Expansion Header. The temperature sensor is normally isolated from the I2C line. To
use the sensor, PF8 must be set high. When enabled, the sensor's current consumption is included in the AEM measurements.
SENSOR_ENABLE
Si7021
Temperature
& Humidity
Sensor
0: I2C lines are isolated, sensor is not powered
1: Sensor is powered and connected
PD7 (I2C0_SCL#1)
PD6 (I2C0_SDA#1)
PF8 (GPIO)
SENSOR_I2C_SDA
SENSOR_I2C_SCL
VMCU
VDD
SCL
SDA
EZR32
Figure 5.4. Si7021 Relative Humidity and Temperature Sensor
Please refer to the Silicon Labs web pages for more information: http://www.silabs.com/humidity-sensors
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5.5 Virtual COM Port
An asynchronous serial connection to the board controller is provided for application data transfer between a host PC and the target
EZR32. This eliminates the need for an external serial port adapter.
VCOM_ENABLE
PB3 (USART2_TX#1)
PB4 (USART2_RX#1)
PA12 (GPIO)
VCOM_RX
VCOM_TX
Board
Controller
EZR32
USB Host
PC
Isolation & Level Shift
PB5 (GPIO)
PB6 (GPIO)
VCOM_CTS
VCOM_RTS
ETH
or
Figure 5.5. Virtual COM Port Interface
The Virtual COM port consists of a physical UART between the target device and the board controller, and a logical function in the
board controller that makes the serial port available to the host PC over USB or Ethernet. The UART interface consists of four pins and
an enable signal.
Table 5.1. Virtual COM Port Interface Pins
Signal Description
VCOM_TX Transmit data from the EZR32 to the board controller
VCOM_RX Receive data from the board controller to the EZR32
VCOM_CTS Clear to Send hardware flow control input, asserted by the board controller when it is ready to receive more data
VCOM_RTS Request to Send hardware flow control output, asserted by the EZR32 when it is ready to receive more data
VCOM_ENABLE Enables the VCOM interface, allowing data to pass through to the board controller.
The parameters of the serial port, such as baud rate or flow control, can be configured using the admin console. The default settings
depends on which radio board is used with the Wireless STK Mainboard.
Note: The VCOM port is only available when the board controller is powered, which requires the J-Link USB cable to be inserted.
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5.5.1 Host Interfaces
Data sent to the board controller through the VCOM interface is available in two different ways to the user. At the same time, data can
be sent to the target device using these interfaces:
• Virtual COM port using a standard USB-CDC driver.
• TCP/IP, by connecting to the Wireless STK on TCP/IP port 4901 with a Telnet client.
When connecting via USB, the device should automatically show up as a COM port. Some examples of device names that can be as-
sosiated with the kit:
• JLink CDC UART Port (COM5) on Windows hosts
• /dev/cu.usbmodem1411 on macOS
• /dev/ttyACM0 on Linux
Note that these are only examples of what the device might show up as, and the actual assignment depends on the operating system,
and how many devices are or have been connected previously. Data sent by the target device into the VCOM interface can be read
from this port, and data written to this port is transmitted to the traget device.
Connecting to the Wireless STK on port 4901 gives access to the same data over TCP/IP. Data written into the VCOM interface by the
target device can be read from the socket, and data written into the socket is transmitted to the target device.
Note: Only one of these interfaces can be used at the same time, with the TCP/IP socket taking priority. This means that if a socket is
connected to port 4901, no data can be sent or received on the USB COM port.
5.5.2 Serial Configuration
By default, the VCOM serial port is configured to use 115200 8N1, with flow control disabled/ignored. (115.2 Kbit/s, 8 databits, 1 stop
bit). The configuration can be changed using the Admin Console:
WSTK> serial vcom config
Usage: serial vcom config [--nostore] [handshake <rts/cts/rtscts/disable/auto>] [speed <9600,921600>]
Using this command, the baud rate can be configured between 9600 and 921600 bit/s, and hardware handshake can be enabled or
disabled on either or both flow control pins.
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5.5.3 Hardware Handshake
The VCOM peripheral supports basic RTS/CTS flow control.
VCOM_CTS (target clear to send) is a signal that is output from the board controller and input to the target device. The board controller
de-asserts this pin whenever its input buffer is full and it is unable to accept more data from the target device. If hardware handshake is
enabled in the target firmware, its UART peripheral will halt when data is not being consumed by the host. This implements end-to-end
flow control for data moving from the target device to the host.
VCOM_CTS is connected to the RTS pin on the board controller, and is enabled by setting handshake to either RTS or RTSCTS using
the "serial vcom config" command.
VCOM_RTS (target request to send) is a signal that is output form the target device and input to the board controller. The board control-
ler will halt transmission of data towards the target if the target device de-asserts this signal. This gives the target firmware a means to
hold off incoming data until it can be processed. Please note that de-asserting RTS will not abort the byte currently being transmitted,
so the target firmware must be able to accept at least one more character after RTS is de-asserted.
VCOM_RTS is connected to the CTS pin of the board controller, and is enabled by setting handshake to either CTS or RTSCTS using
the "serial vcom config" command in the Admin Console. If CTS flow control is disabled, the state of VCOM_RTS will be ignored and
data will be transmitted to the target device anyway.
Table 5.2. Hardware Handshake Configuration
Mode Description
disabled RTS (VCOM_CTS) is not driven by the board controller and CTS (VCOM_RTS) is ignored
rts RTS (VCOM_CTS) is driven by the board controller to halt target from transmitting when input buffer is full. CTS
(VCOM_RTS) is ignored.
cts RTS (VCOM_CTS) is not driven by the board controller. Data is transmitted to the target device if CTS
(VCOM_RTS) is asserted, and halted when de-asserted.
rtscts RTS (VCOM_CTS) is driven by the board controller to halt target when buffers are full. Data is transmitted to the
target device if CTS (VCOM_RTS) is asserted, and halted when de-asserted.
Note: Please note that enabling CTS flow control without configuring the VCOM_RTS pin can result in no data being transmitted from
the host to the target device.
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6. Board Controller
The Wireless STK Mainboard contains a dedicated microcontroller for some of the advanced kit features provided. This microcontroller
is referred to as the "Board Controller", and is not programmable by the user. The board controller acts as an interface between the
host PC and the target device on the radio board, as well as handling some house-keeping functions on the board.
Some of the kit features actively managed by the board controller are:
• The On-board Debugger, which can flash and debug both on-board and external targets.
• The Advanced Energy Monitor, which provides real-time energy profiling of the user application.
• The Packet Trace Interface, which is used in conjunction with PC software to provide detailed insight into an active radio network.
• The Virtual COM Port and Virtual UART interfaces, which provide ways to transfer application data between the host PC and the
target processor.
• The Admin Console, which provides configuration of the various board features.
Silicon Labs publishes updates to the board controller firmware in form of firmware upgrade packages. These updates may enable new
features or fix issues. See 9.1 Firmware Upgrades for details on firmware upgrade.
6.1 Admin Console
The admin console is a command line interface to the board controller on the kit. It provides functionality for configuring the kit behavior
and retreiving configuration and operational parameters.
6.1.1 Connecting
The Wireless Starter Kit must be connected to Ethernet using the Ethernet connector in the top left corner of the mainboard for the
admin console to be available. See Ethernet Interface for details on the Ethernet connectivity.
Connect to the Admin Console by opening a telnet connection to the kit's IP address, port number 4902.
When successfully connected, a WSTK> prompt is displayed.
6.1.2 Built-in Help
The admin console has a built in help system which is accessed by the help command. The help command will print a list of all top
level commands:
WSTK> help
*************** Root commands ****************
aem AEM commands [ calibrate, current, dump, ... ]
boardid Commands for board ID probe. [ list, probe ]
dbg Debug interface status and control [ info, mode,]
dch Datachannel control and info commands [ info ]
discovery Discovery service commands.
net Network commands. [ dnslookup, geoprobe, ip ]
pti Packet trace interface status and control [ config, disable, dump, ... ]
quit Exit from shell
sys System commands [ nickname, reset, scratch, ... ]
target Target commands. [ button, flashwrite, go, ... ]
time Time Service commands [ client, server ]
user User management functions [ login,]
The help command can be used in conjunction with any top level command to get a list of sub-commands with description. For exam-
ple, pti help will print a list of all available sub-commands of pti:
WSTK> pti help
*************** pti commands ****************
config Configure packet trace
disable Disable packet trace
dump Dump PTI packets to the console as they come
enable Enable packet trace
info Packet trace state information
This means that running pti enable will enable packet trace.
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6.1.3 Command Examples
PTI Configuration
pti config 0 efruart 1600000
Configures PTI to use the "EFRUART" mode at 1.6 Mb/s.
Serial Port Configuration
serial config vcom handshake enable
Enables hardware handshake on the VCOM UART connection.
6.2 Virtual UART
The Virtual UART interface provides a high performance application data interface that does not require any additional I/O pins apart
from the debug interface. It is based on SEGGER's Real Time Transfer (RTT) technology, and uses Serial Wire Output (SWO) to get
appliaction data from the device, and a shared memory interface to send data to the target application.
The Wireless Starter Kit makes the Virtual UART interface available on TCP/IP port 4900.
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7. Advanced Energy Monitor
7.1 Introduction
Any embedded developer seeking to make his embedded code spend as little energy as the underlying architecture supports, needs
tools to easily and quickly discover inefficiencies in the running application.
This is what the Simplicity Energy Profiler is designed to do. It will in real-time graph and log current as a function of time while correlat-
ing this to the actual target application code running on the EZR32. There are multiple features in the profiler software that allows for
easy analysis, such as markers and statistics on selected regions of the current graph or aggregate energy usage by different parts of
the application.
7.2 Theory of Operation
The Advanced Energy Monitor (AEM) circuitry on the board is capable of measuring current signals in the range of 0.1 µA to 95 mA,
which is a dynamic range of alomst 120 dB. It can do this while maintaining approximately 10 kHz of current signal bandwidth. This is
accomplished through a combination of a highly capable current sense amplifier, multiple gain stages and signal processing within the
kit's board controller before the current sense signal is read by a host computer for display and/or storage.
The current sense amplifier measures the voltage drop over a small series resistor, and the gain stage further amplifies this voltage with
two different gain settings to obtain two current ranges. The transition between these two ranges occurs around 250 µA.
The current signal is combined with the target processor's Program Counter (PC) sampling by utilizing a feature of the ARM CoreSight
debug architecture. The ITM (Instrumentation Trace Macrocell) block can be programmed to sample the MCU's PC at periodic intervals
(50 kHz) and output these over SWO pin ARM devices. When these two data streams are fused and correlated with the running appli-
cation's memory map, an accurate statistical profile can be built, that shows the energy profile of the running application in real-time.
At kit power-up or on a power-cycle, and automatic AEM calibration is performed. This calibration compensates for any offset errors in
the current sense amplifiers.
EZR32
LDO
Peripherals
AEM
Processing
Figure 7.1. Advanced Energy Monitor
Note: The 3.3 V regulator feedback point is after the 2.35 Ω sense resistor to ensure that the VMCU voltage is kept constant when the
output current changes. Maximum recommended output current is 300 mA.
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7.3 AEM Accuracy and Performance
The AEM is capable of measuring currents in the range of 0.1 µA to 95 mA. For currents above 250 µA, the AEM is accurate within 0.1
mA. When measuring currents below 250 µA, the accuracy increases to 1 µA. Even though the absolute accuracy is 1 µA in the sub
250 µA range, the AEM is able to detect changes in the current consumption as small as 100 nA.
The AEM current sampling rate is 10 kHz.
Note: The AEM circuitry only works when the kit is powered and the power switch is in the AEM position.
7.4 Usage
The AEM data is collected by the board controller and can be displayed by the Energy Profiler, available through Simplicity Studio. By
using the Energy Profiler, current consumption and voltage can be measured and linked to the actual code running on the EZR32 in
realtime.
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8. On-Board Debugger
The Wireless STK Mainboard contains an integrated debugger, which can be used to download code and debug the EZR32. In addition
to programming a target on a plug-in radio board, the debugger can also be used to program and debug external Silicon Labs EFM32,
EFM8, EZR32 and EFR32 devices connected through the debug connector.
The debugger supports three different debug interfaces for Silicon Labs devices:
• Serial Wire Debug, is supported by all EFM32, EFR32 and EZR32 devices
• JTAG, is supported by EFR32 and some EFM32 devices
• C2 Debug, is supported by EFM8 devices
In order for debugging to work properly, make sure that the selected debug interface is supported by the target device. The debug con-
nector on the board supports all three of these modes.
8.1 Host Interfaces
The Wireless Starter Kit supports connecting to the on-board debugger using either Ethernet or USB.
Many tools support connecting to a debugger using either USB or Ethernet. When connected over USB, the kit is identified by its J-Link
serial number. When connected over Ethernet, the kit is normally identified by its IP address. Some tools also support using the serial
number when connecting over Ethernet, this typically require the computer and the kit to be on the same subnet for the discovery proto-
col (using UDP broadcast packets) to work.
8.1.1 USB Interface
The USB interface is available whenever the USB Mini-B connector on the left hand side of the mainboard is connected to a computer.
8.1.2 Ethernet Interface
The Ethernet interface is available when the mainboard Ethernet connector in the top left corner is connected to a network. Normally,
the kit will receive an IP address from a local DHCP server, and the IP address is printed on the LCD display. If your network does not
have a DHCP server, you need to connect to the kit via USB and set the IP address manually using Simplicity Studio, Simplicity
Commander or J-Link Configurator.
For the Ethernet connectivity to work, the kit must still be powered through the USB Mini-B connector. See 4.2 Board Controller Power
for details.
8.1.3 Serial Number Identification
All Silicon Labs kits have a unique J-Link serial number which identifies the kit to PC applications. This number is 9 digits, and is nor-
mally on the form 44xxxxxxx.
The J-Link serial number is normally printed at the bottom of the kit LCD display.
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8.2 Debug Modes
Programming external devices is done by connecting to a target board through the provided Debug IN/OUT Connector, and by setting
the debug mode to [Out]. The same connector can also be used to connect an external debugger to the EZR32 Wireless MCU on the
kit, by setting debug mode to [In].
Selecting the active debug mode is done in Simplicity Studio.
Debug MCU: In this mode the on-board debugger is connected to the EZR32 on the kit.
RADIO BOARD
Board
Controller
USB
Host
Computer
DEBUG HEADER
External
Hardware
Figure 8.1. Debug MCU
Debug OUT: In this mode, the on-board debugger can be used to debug a supported Silicon Labs device mounted on a custom board.
Board
Controller
USB
Host
Computer
DEBUG HEADER
External
Hardware
RADIO BOARD
Figure 8.2. Debug OUT
Debug IN: In this mode, the on-board debugger is disconnected, and an external debugger can be connected to debug the EZR32 on
the kit.
Board
Controller
USB
Host
Computer
DEBUG HEADER
External Debug Probe
RADIO BOARD
Figure 8.3. Debug IN
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Note: For "Debug IN" to work, the kit board controller must be powered through the Debug USB connector.
8.3 Debugging During Battery Operation
When the EZR32 is powered by battery and the J-Link USB is still connected, the on-board debug functionality is available. If the USB
power is disconnected, the Debug In mode will stop working.
If debug access is required when the target is running off another energy source, such as a battery, and the board controller is powered
down, the user should make direct connections to the GPIO used for debugging. This can be done by connecting to the appropriate
pins of the breakout pads. Some Silicon Labs kits provide a dedicated pin header for this purpose.
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9. Kit Configuration and Upgrades
The kit configuration dialog in Simplicity Studio allows you to change the J-Link adapter debug mode, upgrade its firmware and change
other configuration settings.
In the main window of the Simplicity Studio's Launcher perspective, the debug mode and firmware version of the selected J-Link adapt-
er is shown. Click the 'Change' link next to any of them to open the kit configuration dialog.
Figure 9.1. Simplicity Studio Kit Information
Figure 9.2. Kit Configuration Dialog
9.1 Firmware Upgrades
Upgrading the kit firmware is done through Simplicity Studio. Simplicity Studio will automatically check for new updates on startup.
You can also use the kit configuration dialog for manual upgrades. Click the [Browse] button in the [Update Adapter] section to select
the correct file ending in ".emz". Then, click the [Install Package] button.
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10. Schematics, Assembly Drawings, and BOM
Schematics, assembly drawings, and bill of materials (BOM) are available through Simplicity Studio when the kit documentation pack-
age has been installed.
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11. Kit Revision History
The kit revision can be found printed on the kit packaging label, as outlined in the figure below.
SLWRB4502A
EZR32LG 868 MHz 13 dBm Radio Board
124802042
01-02-16
A00
Figure 11.1. Kit Label
11.1 SLWRB4502A Revision History
Kit Revision Released Description
A00 1 February, 2016 Initial release.
11.2 SLWSTK6200A Revision History
Kit Revision Released Description
A02 20 March, 2015 Updated BRD4502A to revision A01.
A01 2 February, 2015 Initial kit release.
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12. Document Revision History
Revision 2.01
6 December, 2017
• Listed SLWSTK6200A as discontinued in Ordering Information section.
• Added SLWRB4502A in Ordering Information section.
• Added SLWRB4502A Revision History section.
• Removed Kit Errata section. Information on radio board errors are found in Radio Board reference manual.
Revision 2.00
23 May, 2016
• Major document update.
• Fixed several errors in pin-out tables and figures.
Revision 1.20
19 March, 2015
• Kit Errata added.
Revision 1.10
23 February, 2015
• Minor text revision.
Revision 1.00
19 February, 2015
• Major updates.
Revision 0.10
23 December, 2014
• Initial document version.
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Disclaimer
Silicon Labs intends to provide customers with the latest, accurate, and in-depth documentation of all peripherals and modules available for system and software implementers using or
intending to use the Silicon Labs products. Characterization data, available modules and peripherals, memory sizes and memory addresses refer to each specific device, and "Typical"
parameters provided can and do vary in different applications. Application examples described herein are for illustrative purposes only. Silicon Labs reserves the right to make changes
without further notice and limitation to product information, specifications, and descriptions herein, and does not give warranties as to the accuracy or completeness of the included
information. Silicon Labs shall have no liability for the consequences of use of the information supplied herein. This document does not imply or express copyright licenses granted
hereunder to design or fabricate any integrated circuits. The products are not designed or authorized to be used within any Life Support System without the specific written consent of
Silicon Labs. A "Life Support System" is any product or system intended to support or sustain life and/or health, which, if it fails, can be reasonably expected to result in significant personal
injury or death. Silicon Labs products are not designed or authorized for military applications. Silicon Labs products shall under no circumstances be used in weapons of mass
destruction including (but not limited to) nuclear, biological or chemical weapons, or missiles capable of delivering such weapons.
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Silicon Laboratories Inc.® , Silicon Laboratories®, Silicon Labs®, SiLabs® and the Silicon Labs logo®, Bluegiga®, Bluegiga Logo®, Clockbuilder®, CMEMS®, DSPLL®, EFM®, EFM32®,
EFR, Ember®, Energy Micro, Energy Micro logo and combinations thereof, "the world’s most energy friendly microcontrollers", Ember®, EZLink®, EZRadio®, EZRadioPRO®,
Gecko®, ISOmodem®, Micrium, Precision32®, ProSLIC®, Simplicity Studio®, SiPHY®, Telegesis, the Telegesis Logo®, USBXpress®, Zentri and others are trademarks or registered
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