Silicon Laboratories Mighty Gecko MGM12P User Manual

V. 2/18

UG290: MGM12P Mighty Gecko Module
Wireless Starter Kit User's Guide

A Silicon Labs Wireless Starter Kit for the MGM12P Mighty Gecko
Mesh Networking Module for zigbee® and Thread is an excellent
starting point to get familiar with the device, and it provides all nec­essary tools for developing a Silicon Labs wireless application.

The Wireless Starter Kit Mainboard contains sensors and peripherals enabling easy
demonstration of the many capabilities of the MGM12P. An on-board J-Link debugger al­lows debugging of the attached radio board as well as providing a debug connection for
external hardware.

A plug-in Radio Board contains the reference design for the MGM12P itself, including the
RF section and device-specific hardware.

WSTK MAINBOARD FEATURES

• Ethernet and USB connectivity

• Advanced Energy Monitor

• Virtual COM Port

• Packet Trace Interface support

• SEGGER J-Link on-board debugger

• Supports debugging the attached radio
board or an external device

• Silicon Labs' Si7021 Relative Humidity
and Temperature sensor

• Ultra low power 128x128 pixel Memory
LCD

• User LEDs / Pushbuttons

• 20-pin 2.54 mm header for expansion
boards

• Breakout pads for direct access to all radio
I/O pins

• Power sources include USB and CR2032
coin cell battery.

BRD4304A RADIO BOARD FEATURES

• MGM12P12P32F1024GA Module

• 1024 kB Flash and 256 kB RAM

• 18 dBm output power

• -105 dBm sensitivity

• 8 Mbit low-power serial flash for over-the­air upgrades.

Singel 3 | B-2550 Kontich | Belgium | Tel. [phone] | [e-mail] | www.alcom.be

Rivium 1e straat 52 | 2909 LE Capelle aan den Ijssel | The Netherlands | Tel. [phone] | [e-mail] | www.alcom.nl

SOFTWARE SUPPORT

• Simplicity Studio™

• zigbee and Thread mesh networking
software

• Blue Gecko Bluetooth software

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 ............................8

3.4.1 Expansion Header Pin-out .......................9

3.5 Debug Connector.............................10

3.6 Simplicity Connector............................11

3.7 Debug Adapter .............................12

4. Power Supply and Reset .......................... 13

4.1 Radio Board Power Selection ........................13

4.2 Board Controller Power...........................14

4.3 MGM12P Reset .............................14

5. Peripherals ............................... 15

5.1 Push Buttons and LEDs ..........................15

5.2 Memory LCD-TFT Display..........................16

5.3 Serial Flash ..............................17

5.4 Si7021 Relative Humidity and Temperature Sensor .................18

5.5 Virtual COM Port .............................19

6. Board Controller ............................. 20

6.1 Admin Console .............................20

6.1.1 Connecting .............................20

6.1.2 Built-in Help ............................20

6.1.3 Command Examples .........................21

6.2 Virtual UART ..............................21

7. Advanced Energy Monitor ......................... 22

7.1 Introduction...............................22

7.2 Theory of Operation ............................22

7.3 AEM Accuracy and Performance .......................23

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7.4 Usage ................................23

8. On-Board Debugger ............................ 24

8.1 Host Interfaces .............................24

8.1.1 USB Interface ............................24

8.1.2 Ethernet Interface ..........................24

8.1.3 Serial Number Identification .......................24

8.2 Debug Modes ..............................25

8.3 Debugging During Battery Operation ......................26

9. Kit Configuration and Upgrades ....................... 27

9.1 Firmware Upgrades ............................27

10. Mechanical Details ............................ 28

11. Schematics, Assembly Drawings and BOM................... 29

12. Radio Board Revision History and Errata ................... 30

12.1 BRD4304A Revision History ........................30

12.2 BRD4304A Errata ............................30

13. Kit Revision History ........................... 31

13.1 SLWRB4304A Revision history........................31

14. Document Revision History ........................ 32

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UG290: MGM12P Mighty Gecko Module Wireless Starter Kit User's Guide

Introduction

1. Introduction

The MGM12P Mighty Gecko Module itself is featured on a Radio Board that forms a complete reference design, inluding 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
MGM12P.

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 MGM12P Mighty Gecko Mesh Networking Module Radio Board
(BRD4304A) is combined with a Mainboard. The combination of these two boards is hereby referred to as a Wireless Starter Kit (Wire­less STK).

1.2 Ordering Information

BRD4304A can be obtained as a separate radio board, SLWRB4304A. The radio board is intended to be used together with a Wireless
STK Mainboard that can be obtained with any Silicon Labs Wireless Starter Kit.

Table 1.1. Ordering Information

Part Number Description Contents Notes

SLWRB4304A MGM12P Mighty Gecko Module Radio

Board

1.3 Getting Started

Detailed instructions for how to get started can be found on the Silicon Labs web pages:

http://www.silabs.com/start-efr32mg

1x BRD4304A MGM12P Mighty Gecko Mesh Networking Mod­ule Radio Board

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MGM12P

Module

Radio Board

Breakout pads

Breakout pads

1.28" Memory-LCD Display

Ultra-low power
128 x 128 pixel resolution
SPI interface

Ethernet RJ-45

J-Link Debugger
Virtual COM port
Packet Trace
Advanced Energy Monitoring

USB Mini-B

J-Link Debugger
Virtual COM port
Packet Trace
Advanced Energy Monitoring

Coin Cell Holder

CR2032 Battery

Power Select Switch

BAT / USB / AEM

2x User Push Buttons

2x User LEDs

Simplicity Connector

Virtual COM port
Packet Trace
Advanced Energy Monitoring

Debug Connector

ARM Coresight 19-pin
OUT: External targets
IN: External debug probes

Reset Button

Si7021

Relative Temperature &
Humidity Sensor

EXP Header

Expansion board connector

UG290: MGM12P Mighty Gecko Module Wireless Starter Kit User's Guide

Hardware Overview

2. Hardware Overview

2.1 Hardware Layout

The layout of the MGM12P Mighty Gecko Mesh Networking Module Wireless Starter Kit is shown in the figure below.

Figure 2.1. Kit Hardware Layout

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WSTK Mainboard

USB Mini-B

Connector

RJ-45 Ethernet

Connector

Debug

UART

Packet Trace

AEM

Debug

UART

ETM Trace

Packet Trace

AEM

Debug

UART

Packet Trace

AEM

Simplicity

Connector

Debug

Connector

Board

Controller

Multiplexer

OUT

IN

MCU

MGM12P

Mesh Module

GPI

O

EXP

Header

User Buttons

& LEDs

GPIO

128 x 128 pixel

Memory LCD

I2C

Si7021

Temperature

& Humidity

Sensor

SPI

8 Mbit

MX25R

Serial Flash

UG290: MGM12P Mighty Gecko Module Wireless Starter Kit User's Guide

Hardware Overview

2.2 Block Diagram

An overview of the MGM12P Mighty Gecko Mesh Networking Module Wireless Starter Kit is shown in the figure below.

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Figure 2.2. Kit Block Diagram

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

UG290: MGM12P Mighty Gecko Module Wireless Starter Kit User's Guide

Connectors

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.

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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GND

VMCU

P23 / PD15 / DISP_ENABLE / SENSOR_ENABLE

P21 / PD14 / DISP_SCS

P19 / PD13 / DISP_EXTCOMIN

P17 / NC

GND

P15 / NC

P13 / PC10 / EXP16 / I2C_SDA

P11 / PA1 / EXP14 / VCOM_RX

P9 / PA0 / EXP12 / VCOM_TX

P7 / PC9 / EXP10

P5 / PC8 / EXP8 / FLASH_SCLK / DISP_SCLK

P3 / PC7 / EXP6 / FLASH_MISO

P1 / PC6 / EXP4 / FLASH_MOSI / DISP_SI

GNDGND

5V5V

NCNC

P45 / NCNC / P44

P43 / NCNC / P42

P41 / NCNC / P40

3V33V3

P39 / NCNC / P38

P37 / PD15 / DISP_ENABLE / SENSOR_ENABLENC / P36

P35 / NCNC / P34

P33 / PF7 / BUTTON1_LED1NC / P32

P31 / PF6 / BUTTON0_LED0NC / P30

P29 / PF2 / DBG_TDO_SWONC / P28

P27 / PF1 / DBG_TMS_SWDIONC / P26

P25 / PF0 / DBG_TCK_SWCLKPTI_DATA / PB11 / P24

GNDGND

VRF

GND

VMCU

PTI_SYNC / PB13 / P22

VCOM_ENABLE / PA5 / P20

FLASH_SCS / PA4 / P18

NC / P16

GND

NC / P14

I2C_SCL / EXP15 / PC11 / P12

DBG_TDI / EXP13 / PF3 / P10

EXP11 / NC / P8

EXP9 / PF5 / P6

EXP7 / PF4 / P4

VCOM_RTS / EXP5 / PA3 / P2

VCOM_CTS / EXP3 / PA2 / P0

VRF

J101

J102

12

4

8
6

10

3

5

9
7

12

13

14

11

1516

17

18

20 19

VMCU

SPI_MOSI / PC6

SPI_MISO / PC7

SPI_SCK / PC8

SPI_CS / PC9

UART_TX / PA0

UART_RX / PA1

I2C_SDA / PC10

5V

3V3

GND

PA2 / GPIO

PA3 / GPIO

PF4 / GPIO

PF5 / GPIO

NC

PF3 / GPIO

PC11 / I2C_SCL

Board ID SDA
Board ID SCL

Reserved (Board Identification)

MGM12P I/O Pin

UG290: MGM12P Mighty Gecko Module Wireless Starter Kit User's Guide

Connectors

3.3 Breakout Pads

Most pins of the MGM12P 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
MGM12P maps to the pin numbers printed on the breakout pads. To see the available functions on each, please refer to the
MGM12P32F1024GA-V2R Data Sheet.

Figure 3.2. Radio Board Pin Mapping on Breakout Pads

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 peripher­als or plugin boards. The connector contains a number of I/O pins that can be used with most of the MGM12P Mighty 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.

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Figure 3.3. Expansion Header

UG290: MGM12P Mighty Gecko Module Wireless Starter Kit User's Guide

Connectors

3.4.1 Expansion Header Pin-out

The pin-routing on the MGM12P is very flexible, so most peripherals can be routed to any pin. However, many pins are shared between
the Expansion Header and other functions on the Wireless STK Mainboard. Table 3.1 Expansion Header Pinout on page 9 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 PC10 I2C_SDA SENSOR_I2C_SDA I2C0_SDA #15

14 PA1 UART_RX VCOM_RX USART0_RX #0

12 PA0 UART_TX VCOM_TX USART0_TX #0

10 PC9 SPI_CS USART1_CS #11

8 PC8 SPI_SCLK FLASH_SCLK, DISP_SCLK USART1_CLK #11

6 PC7 SPI_MISO FLASH_MISO USART1_RX #11

4 PC6 SPI_MOSI FLASH_MOSI, DISP_SI USART1_TX #11

2 VMCU MGM12P 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 PC11 I2C_SCL SENSOR_I2C_SCL I2C0_SCL #15

13 PF3 GPIO DBG_TDI

11 NC

9 PF5 GPIO

7 PF4 GPIO

5 PA3 GPIO VCOM_RTS

3 PA2 GPIO VCOM_CTS

1 GND Ground

Note: Pin PF3 is used for DBG_TDI in JTAG mode only. When Serial Wire Debugging is used, PF3 can be used for other purposes.

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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

UG290: MGM12P Mighty Gecko Module Wireless Starter Kit User's Guide

Connectors

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 MGM12P 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 "De­bug 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.

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 Not connected

14 TRACED0 Not connected

16 TRACED1 Not connected

18 TRACED2 Not connected

20 TRACED3 Not connected

9 Cable detect Connect to ground

11, 13 NC Not connected

3, 5, 15, 17, 19 GND Ground

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VMCU

1
33V3
5

5V

15

GND

13

GND

11

GND

9

GND

7

GND

17

Board ID SCL

19

Board ID SDA

2

VCOM_TX

4 VCOM_RX

6 VCOM_CTS
8

VCOM_RTS

10

PTI0_SYNC

12

PTI0_DATA

14

PTI0_CLK

16

PTI1_SYNC

18

PTI1_DATA

20

PTI1_CLK

UG290: MGM12P Mighty Gecko Module Wireless Starter Kit User's Guide

Connectors

3.6 Simplicity Connector

The Simplicity Connector enables the advanced debugging features, such as the AEM, the Virtual COM port and the Packet Trace In­terface, to be used towards an external target. The pinout is illustrated in the figure below.

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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VAEM

1
3

RST

5

VCOM_TX

9

PTI_FRAME

7

SWDIO

2

GND

4

VCOM_RX

6

SWO

8

SWCLK

10

PTI_DATA

UG290: MGM12P Mighty Gecko Module Wireless Starter Kit User's Guide

Connectors

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 feature 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.

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

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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VMCU

AEM

USB

BAT

USB Mini-B

Connector

Advanced

Energy

Monitor

3 V Lithium Battery

(CR2032 )

B

A

T

U

SB

AE

M

LDO

MGM12P

5 V

3.3 V

UG290: MGM12P Mighty Gecko Module Wireless Starter Kit User's Guide

Power Supply and Reset

4. Power Supply and Reset

4.1 Radio Board Power Selection

The MGM12P on a Wireless Starter Kit can be powered by one of these sources:

• the debug USB cable;

• a 3 V 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. Figure

4.1 Power Switch on page 13 shows how the different power sources can be selected with the slide switch.

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, radio boards with USB-support can be powered by a regulator on the radio board itself. BRD4304A
does not contain an USB regulator, and setting the switch in the USB postition will cause the MGM12P to be unpowered.

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 MGM12P when the power selection switch is in
the AEM position.

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UG290: MGM12P Mighty Gecko Module Wireless Starter Kit User's Guide

Power Supply and Reset

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 differ­ent 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 MGM12P device will continue to operate in the USB and BAT modes.

4.3 MGM12P Reset

The MGM12P Module 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 MGM12P will also be issued during Board Controller boot-up. This
means that removing power to the Board Controller (plugging out 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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User Buttons

& LEDs

UIF_BUTTON0_LED0

UIF_BUTTON1_LED1

PF6 (GPIO)

PF7 (GPIO)

MGM12P

UG290: MGM12P Mighty Gecko Module Wireless Starter Kit User's Guide

Peripherals

5. Peripherals

The starter kit has a set of peripherals that showcase some of the features of the MGM12P.

Be aware that most MGM12P 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 features two user push buttons, marked PB0 (BUTTON0) and PB1 (BUTTON1), and two yellow LEDs, marked LED0 and LED1.

BUTTON0 and LED0 shares the connection to GPIO pin PF6, and BUTTON1 and LED1 are both connected to PF7.

To use the push buttons as inputs to the MGM12P, each button's GPIO pin must be configured as an input. Configure the pins as out­puts to control the LEDs. Note that LEDs are connected to GPIO pins in an active-low configuration.

The push buttons are debounced by RC filters with a time constant of 1 ms.

Figure 5.1. Buttons/LEDs

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PC8 (USART1_CLK #11)

PC6 (USART1_TX #11)

PD14 (USART1_CS #19)

PD13 (GPIO)

PD15 (GPIO)

MGM12P

0: Board Controller controls display
1: MGM12P controls display

UG290: MGM12P Mighty Gecko Module Wireless Starter Kit User's Guide

Peripherals

5.2 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 addressa­ble, 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 infor­mation 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 (MGM12P) has control of the display

Power to the display is sourced from the target application power domain when the MGM12P 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

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Figure 5.2. 128x128 Pixel Memory LCD

PC8 (US1_CLK#11)

PC6 (US1_TX#11)

PC7 (US1_RX#11)

PA4 (US1_CS#1)

MGM12P

MX25R8035F

SCLK

MOSI

MISO

SCS

VMCU

VDD

8 Mbit

UG290: MGM12P Mighty Gecko Module Wireless Starter Kit User's Guide

Peripherals

5.3 Serial Flash

The BRD4304A radio board is equipped with an 8 Mbit Macronix MX25R SPI flash that is connected directly to the MGM12P. Figure

5.3 Radio Board Serial Flash on page 17 shows how the serial flash is connected to the MGM12P.

Figure 5.3. Radio Board Serial Flash

The MX25R series are ultra low power serial flash devices, so there is no need for a separate enable switch to keep current consump­tion down. However, it is important that the flash is always put in deep power down mode when not used. This is done by issuing a
command over the SPI interface. In deep power down, the MX25R typically adds approximately 100 nA to the radio board current con­sumption.

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SENSOR_ENABLE

0: I2C lines are isolated, sensor is not powered
1: Sensor is powered and connected

PC10 (I2C0_SDA #15)

PC11 (I2C0_SCL #15)

PD15

SENSOR_I2C_SDA

SENSOR_I2C_SCL

VMCU

VDD

SCL

SDA

Temperature

& Humidity

Sensor

MGM12P

Si7021

UG290: MGM12P Mighty Gecko Module Wireless Starter Kit User's Guide

Peripherals

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 ele­ments, 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, SENSOR_ENABLE (PD15) must be set high. When enabled, the sensor's current consumption is included in the AEM
measurements.

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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VCOM_ENABLE

PA0 (US0_TX#0)

PA1 (US0_RX#0)

PA5 (GPIO)

VCOM_RX

VCOM_TX

Board

Controller

MGM12P

USB

Host

PC

Isolation & Level Shift

PA2 (US0_CTS#30)

PA3 (US0_RTS#30)

VCOM_CTS

VCOM_RTS

ETH

or

UG290: MGM12P Mighty Gecko Module Wireless Starter Kit User's Guide

Peripherals

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
MGM12P. This eliminates the need for an external serial port adapter.

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 MGM12P to the board controller

VCOM_RX Receive data from the board controller to the MGM12P

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 MGM12P 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. Please see for more details.

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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UG290: MGM12P Mighty Gecko Module Wireless Starter Kit User's Guide

Board Controller

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 exam­ple, 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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UG290: MGM12P Mighty Gecko Module Wireless Starter Kit User's Guide

Board Controller

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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MGM12P

LDO

Peripherals

AEM

Processing

UG290: MGM12P Mighty Gecko Module Wireless Starter Kit User's Guide

Advanced Energy Monitor

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 correlat­ing this to the actual target application code running on the MGM12P. 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 appli­cation'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.

Figure 7.1. Advanced Energy Monitor

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UG290: MGM12P Mighty Gecko Module Wireless Starter Kit User's Guide

Advanced Energy Monitor

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 MGM12P in
realtime.

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UG290: MGM12P Mighty Gecko Module Wireless Starter Kit User's Guide

On-Board Debugger

8. On-Board Debugger

The Wireless STK Mainboard contains an integrated debugger, which can be used to download code and debug the MGM12P. 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 con­nector 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 proto­col (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 nor­mally on the form 44xxxxxxx.

The J-Link serial number is normally printed at the bottom of the kit LCD display.

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RADIO BOARD

Board

Controller

USB

Host

Computer

DEBUG HEADER

External

Hardware

Board

Controller

USB

Host

Computer

DEBUG HEADER

External

Hardware

RADIO BOARD

Board

Controller

USB

Host

Computer

DEBUG HEADER

External Debug Probe

RADIO BOARD

UG290: MGM12P Mighty Gecko Module Wireless Starter Kit User's Guide

On-Board Debugger

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 MGM12P Module 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 MGM12P on the kit.

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.

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 MGM12P

on the kit.

silabs.com | Building a more connected world. Rev. 1.00 | 25

Figure 8.3. Debug IN

UG290: MGM12P Mighty Gecko Module Wireless Starter Kit User's Guide

On-Board Debugger

Note: For "Debug IN" to work, the board controller on the kit must be powered throught the USB connector.

8.3 Debugging During Battery Operation

When the MGM12P 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 of 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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UG290: MGM12P Mighty Gecko Module Wireless Starter Kit User's Guide

Kit Configuration and Upgrades

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 adapt­er is shown. Click the 'Change' link next to any of them to open the kit configuration dialog.

Figure 9.1. Simplicity Studio Kit Information

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.

silabs.com | Building a more connected world. Rev. 1.00 | 27

Figure 9.2. Kit Configuration Dialog

40 mm

40 mm

24 mm

20 mm

5 mm

UG290: MGM12P Mighty Gecko Module Wireless Starter Kit User's Guide

10. Mechanical Details

The mechanical layout of BRD4304A MGM12P Mighty Gecko Module Radio Board is illustrated in the figures below.

Mechanical Details

Figure 10.1. BRD4304A Top View

Figure 10.2. BRD4304A Bottom View

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UG290: MGM12P Mighty Gecko Module Wireless Starter Kit User's Guide

Schematics, Assembly Drawings and BOM

11. Schematics, Assembly Drawings and BOM

Schematics, assembly drawings and bill of materials (BOM) are available through Simplicity Studio when the kit documentation pack­age has been installed.

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12. Radio Board Revision History and Errata

12.1 BRD4304A Revision History

The Radio Board revision is printed on the backside of the board.

Table 12.1. BRD4304A Revision History

Radio Board Revision Release Date Description

A00 2017-01-11 Initial version.

12.2 BRD4304A Errata

There are no known errata at present.

UG290: MGM12P Mighty Gecko Module Wireless Starter Kit User's Guide

Radio Board Revision History and Errata

silabs.com | Building a more connected world. Rev. 1.00 | 30

SLWRB4304A

MGM12P Mesh Networking Module Radio Board

124802042

27-04-17

A00

UG290: MGM12P Mighty Gecko Module Wireless Starter Kit User's Guide

13. Kit Revision History

The kit revision can be found printed on the kit packaging label, as outlined in the figure below.

Figure 13.1. Kit Label

13.1 SLWRB4304A Revision history

Kit Revision Released Description

Kit Revision History

A00 2017-05-30 Initial release.

silabs.com | Building a more connected world. Rev. 1.00 | 31

14. Document Revision History

Revision 1.00

2017-06-09

Initial version.

UG290: MGM12P Mighty Gecko Module Wireless Starter Kit User's Guide

Document Revision History

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