Silicon Labs UG125 User's Guide

Silicon Labs UG125 User's Guide
UG125: EFM8BB3-SLSTK2022A User's
Guide
The EFM8BB3-SLSTK2022A is an excellent starting point to get
familiar with the EFM8 Busy Bee microcontrollers.
KEY FEATURES
The kit contains sensors and peripherals demonstrating some of the MCU's many capabilities. The kit can also serve as a starting point for application development.
• EFM8BB31F64G MCU with 64 KB Flash
and 4 KB RAM.
The kit includes the following:
• Power sources include USB and CR2032
battery.
• EFM8BB3 Busy Bee Starter Kit Board
• 1 x CR2032 battery
• Getting Started card
• 1 x mini USB cable
• 20-pin expansion header.
• 2 user buttons, 1 tri-color LED.
• 8-direction joystick.
• Ultra low power 128x128 pixel MemoryLCD.
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UG125: EFM8BB3-SLSTK2022A User's Guide
Getting Started
1. Getting Started
Hardware
To set up the hardware for the EFM8BB3-SLSTK2022A kit:
1. Provide power to the board by connecting the USB connector to the PC using the provided USB cable.
2. Move the switch to the Advanced Energy Monitor (AEM) position.
Figure 1.1. Hardware Setup
Software
The first step to get started with your new EFM8BB3-SLSTK2022A is to go to
http://www.silabs.com/simplicity
The Simplicity Studio software package contains all the tools, drivers, software examples and documentation needed to use the
EFM8BB3 Starter Kit. The board comes pre-loaded with a default application, Space Invaders, to interact with while the software downloads.
After downloading the latest version of Simplicity Studio and installing:
1. Select the J-Link adapter for the kit under [Devices].
2. Click one of the demos available under [Getting Started]>[Demos] or click the [Getting Started]>[Demos]>[View All] to view the
entire list of available demos.
3. Click the [Space Invaders] demo and click [Start] to download and run the demo.
Additional demos showcasing the various features of the EFM8 are also available in Simplicity Studio.
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Kit Block Diagram
2. Kit Block Diagram
An overview of the EFM8BB3 Starter Kit is shown in the figure below.
POWER
UART
EFM8BB3
Microcontroller
ADC
Board
Controller
Joystick
Figure 2.1. EFM8BB3-SLSTK2022A Block Diagram
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Kit Hardware Layout
3. Kit Hardware Layout
The layout of the EFM8BB3 Starter Kit is shown below.
Debug IN/OUT
Connector
128x128 Pixel
Memory LCD
Reference
Board Connector
Direct
Debug Connector
Kit USB
Connector
EFM8BB3 MCU
Expansion
Header
CR2032
Battery Holder
EFM8 Reset Button
User Push
Buttons
Power Source Select
Joystick
User LED
Figure 3.1. EFM8BB3-SLSTK2022A Hardware Layout
The EFM8 device on the kit is connected to several peripherals. The table below shows all of the external connections to the MCU.
Table 3.1. Kit MCU Connections
MCU Port Pin
Port Pin Assigned
Function
Primary Board Connec- Secondary Board Contion
nection
P0.0
GPIO
VREF Caps
P0.1
GPIO
P0.2
Port Match Input
Push Button 0 (PB0)
P0.3
Port Match Input
Push Button 1 (PB1)
P0.4
UART0 TX
BC - UART_TX
P0.5
UART0 RX
BC - UART_RX
P0.6
SPI0 SCK
DISP - SPI CLK1
P0.7
SPI0 MISO
P1.0
SPI0 MOSI
P1.1
SPI0 NSS
P1.2
SMBus0 SDA
P1.3
Expansion Port Connection (EXP)
AGND
SPI CLK
EXP8
SPI MISO
EXP6
SPI MOSI
EXP4
SPI CS
EXP10
I2C SDA
BC - REFCLK
EXP16
SMBus0 SCL
I2C SCL
BC - 1 kHz SINE
EXP15
P1.4
PCA0 CEX0
RGB LED0
P1.5
PCA0 CEX1
RGB LED1
P1.6
PCA0 CEX2
RGB LED2
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DISP - SPI MOSI
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Kit Hardware Layout
MCU Port Pin
Port Pin Assigned
Function
Primary Board Connec- Secondary Board Contion
nection
Expansion Port Connection (EXP)
P1.7
ADC / CMP
Joystick
P2.0
UART1 TX
UART1 TX
EXP12
P2.1
UART1 RX
UART1 RX
EXP14
P2.2
GPIO
BC - Enable
P2.3
GPIO
DAC LOOPBACK0
P2.4
GPIO
P2.5
GPIO
P2.6
GPIO
DISP - SPI CS
P3.0
GPIO
DAC LOOPBACK1
P3.1
GPIO
EXP7
P3.2
GPIO
EXP9
P3.3
GPIO
EXP11
P3.4
GPIO
P3.7 / C2D
C2D (for debug)
EXP3
EXP13
UFL ADC INPUT
EXP5
DISP - Enable
Note:
1. This signal has high loading. If the MCU pin is used for signals where edge speed is critical, this signal should be disconnected
from the pin.
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UG125: EFM8BB3-SLSTK2022A User's Guide
Power Supply and Reset
4. Power Supply and Reset
4.1 MCU Power Selection
The Busy Bee MCU on the EFM8BB3-SLSTK2022A is designed to be powered by three different sources:
• Through the on-board debugger.
• By a 3 V Battery.
• An externally supplied power source.
Selecting the power source is done with the slide switch in the lower left corner of the board. The figure shows how the different power
sources can be selected with the slide switch.
Figure 4.1. EFM8BB3-SLSTK2022A Power Switch
With the switch in the AEM position, an on-board low noise LDO with a fixed output voltage of 3.3 V is used to power the MCU. This
LDO is powered from the "J-Link" USB cable.
With the switch in the BAT position, the device may be powered from either a 20 mm coin cell battery (in the CR2032 socket) or an
external power supply (connected to the VMCU and GND pins on the expansion header).
4.2 MCU Reset
The EFM8 MCU can be reset by a few different sources:
• The RESET button.
• An external debugger by pulling the RSTb pin low.
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UG125: EFM8BB3-SLSTK2022A User's Guide
Peripherals
5. Peripherals
The starter kit has a set of peripherals that showcase some of the features of the EFM8 Busy Bee microcontroller.
Be aware that most EFM8 I/O routed to peripherals are also routed to the breakout pads. This must be taken into consideration when
using the breakout pads for your application.
5.1 Push Buttons and LEDs
The kit has two user push buttons. They are connected to the EFM8, and are debounced by RC filters with a time constant of 1 ms. The
buttons are connected to pins P0.2 and P0.3.
In addition to the two push buttons, the kit also features a tri-color LED that is controlled by EFM8 GPIO. The LED is connected to pins
P1.4, P1.5, and P1.6 in an active-low configuration.
Figure 5.1. Buttons/LEDs
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Peripherals
5.2 Joystick
The kit has an analog joystick with 8 measureable positions. This joystick is connected to the EFM8 on the P1.7 pin and uses different
resistor values to create voltages measurable by the ADC0.
Figure 5.2. Joystick
Table 5.1. Joystick Resistor Combinations
Direction
Resistors Combinations (kΩ)
Expected UIF_JOYSTICK Voltage (V)1
Center press
0.1
0.1 + 10
0.033
Up (N)
60.4
60.4 + 10
2.831
(N // E )
21.34
= 21.34 + 10
(N // E ) + 10
2.247
33
33 + 10
2.533
(S // E )
7.67
= 7.67 + 10
(S // E ) + 10
1.433
10
10 + 10
1.650
(S // W )
6
= 6 + 10
(S // W ) + 10
1.238
15
15 + 10
1.980
(N // W )
12.01
= 12.01 + 10
(N // W ) + 10
1.801
Up-Right (NE)
Right (E)
Down-Right (SE)
Down (S)
Down-Left (SW)
Left (W)
Up-Left (NW)
Note:
1. These calculated values assume a VMCU of 3.3 V.
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Peripherals
5.3 Memory LCD-TFT Display
A 1.28-inch SHARP Memory LCD-TFT has been added to the board to enable interactive applications to be developed. The display has
a high resolution of 128 by 128 pixels and consumes very little power. It is a reflective monochrome display, so each pixel can only be
light or dark, and no backlight is needed in normal daylight conditions.
The display interface consists of an SPI-compatible serial interface and some extra control signals. Data are 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 EFM8 MCU always controls ownership of the display using the
EFM_DISP_ENABLE signal:
• 0: The Board Controller has control of the display.
• 1: The user application (EFM8) has control of the display.
Data are clocked in on EFM_DISP_MOSI (P1.0) when EFM_DISP_CS (P2.6) is high, and the clock is sent on EFM_DISP_SCLK
(P0.6). The maximum supported clock speed is 1 MHz.
Please refer to the display application information for details on driving the display:
http://www.sharpmemorylcd.com/1-28-inch-memory-lcd.html
P0.6 (SPI0)
P1.0 (SPI0)
P2.6 (GPIO)
P3.4 (GPIO)
EFM_DISP_ENABLE
0: BC controls display
1: EFM controls display
8
Figure 5.3. 128x128 Pixel Memory LCD
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UG125: EFM8BB3-SLSTK2022A User's Guide
Connectors
6. Connectors
6.1 Breakout Pads
Many of the EFM8's pins are routed out to "breakout pads" at the top and bottom edges of the kit. A 2.54 mm pitch pin header can be
soldered in for easy access to these pins. Most I/O pins are available, with the exception of pins used to drive the LCD.
Note: Some of the breakout pads are shared by on-board EFM peripherals. The schematic must be consulted to make sure that it is
acceptable to use a shared pin in your application.
Figure 6.1. Breakout Pads and Expansion Header
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Connectors
6.2 Expansion Header
On the right hand side of the board an angled 20-pin expansion header is provided to allow connection of peripherals or plugin boards.
The connecter contains a number of I/O pins that can be used with most of the Busy Bee's features. Additionally, the VMCU, 3V3 and
5V power rails are also exported.
The figure below shows the pin assignment of the expansion header. With the exception of a few pins, most of the expansion header's
pins are the same as those on the EFM32 Gecko or EFM32 Tiny Gecko starter kits.
Figure 6.2. Expansion Header
Some of the chip peripheral functions that are available on the expansion header are listed in the table below.
Table 6.1. Some Peripheral Functions Available on Expansion Header
Peripheral
Peripheral pin
MCU Pin
EXP Header pin
number
UART1
UART1 TX
P2.0
12
UART1 RX
P2.1
14
SPI0 SCK
P0.6
8
SPI0 MISO
P0.7
6
SPI0 MOSI
P1.0
4
SPI0 CS
P1.1
10
SMBus0 SDA
P1.2
16
SMBus0 SCL
P1.3
15
I2CSLAVE0 SDA
P2.0
12
I2CSLAVE0 SCL
P2.1
14
Input
Any supported pin (see Reference Manual for more information)
Multiple
CNVSTR
P0.6
8
SPI0
SMBus
I2CSLAVE0
ADC0
Comparator 0
Comparator 1
CMP0P Positive Input Any supported pin (see Reference Manual for more information)
Multiple
CMP0N Negative Input
Any supported pin (see Reference Manual for more information)
Multiple
CMP1P Positive Input Any supported pin (see Reference Manual for more information)
Multiple
CMP1N Negative Input
Multiple
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Any supported pin (see Reference Manual for more information)
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Connectors
Note: This table only sums up some of the alternate functions available on the expansion header. Consult the EFM8BB31F64G data
sheet for a complete list of alternate functions.
6.3 Debug Connector
This connector is used for Debug In and Debug Out (see chapter on Debugging).
Figure 6.3. Debug Connector
Table 6.2. Debug Connector Pinout
Pin num- Function
ber
Note
1
Target voltage on the debugged application.
VTARGET
Note: This connection is required and is needed for the debug circuitry to match voltage levels
with the target device.
2
TMS/SWDIO/C2D
JTAG TMS, Serial Wire data I/O, or EFM8 C2 data I/O
4
TCK/SWCLK/C2CK
JTAG TCK, Serial Wire clock, or EFM8 C2 clock
6
TDO/SWO
JTAG TDO or Serial Wire Output
8
TDI
JTAG data in
9
ATTACH
This signal must be pulled to ground by the external debugger or application for cable insertion
detection.
10
#RESET
Target MCU reset.
12
TRACECLK
Trace clock
14, 16,
18, 20
TRACED0-3
Trace data (4 lines)
11, 13
NC
Not Connected
3, 5, 15,
17, 19
GND
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Connectors
6.4 Direct Debug Connector
This connector (J103) is used for directly debugging the EFM8 using an external debug adapter (see chapter on Debugging). This is
especially useful for debugging the MCU on the STK board when the part is battery powered or powered by an external supply.
Figure 6.4. Direct Debug Connector
Table 6.3. Direct Debug Connector Pinout
Pin number
Function
Note
1
C2CK
EFM8 C2 clock
2
C2D
EFM8 C2 data I/O
3
GND
6.5 Reference Board
The top-right corner of the board includes a 20-pin reference board connector. The connecter contains some I/O pins that can be used
with some of the EFM8 Busy Bee's features. Additionally, the 3V3 and 5V power rails are also exported.
The figure below shows the pin assignment of the reference board header.
Figure 6.5. Reference Board Header
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Integrated Development Environment
7. Integrated Development Environment
Figure 7.1. Simplicity Studio
Simplicity Studio includes various examples in source form to use with the Starter Kit. To run these examples:
1. Provide power to the board by connecting the DBG USB connector to the PC using the provided USB cable.
2. Move the switch to the AEM position.
3. Select the J-Link adapter for the kit under [Devices].
4. Click the [Getting Started]>[New Project] button.
5. In the wizard, ensure the EFM8BB3 Busy Bee Starter Kit Board kit and click [Next].
6. Select [Example] and click [Next].
7. Select the desired example or demo from the list and click [Next].
8. Click [Finish].
9. Click the [Debug] button in the IDE to build and download the code to the hardware.
10. Follow the instructions at the top of the main example file to set up the hardware as needed.
11. Click the [Resume] button to start running the example.
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Advanced Energy Monitor
8. Advanced Energy Monitor
When the EFM8BB3 Starter Kit is connected to a Silicon Labs STK, the STK's Advanced Energy Monitor (AEM) hardware also measures the slstk2022a power consumption using the VMCU connection on the EXP header. By using the [Energy Profiler] in Simplicity
Studio, current consumption and voltage can be measured in real time.
More details about AEM and its operation can be found in the STK User Guide. Note that AEM will measure the current for all circuitry
connected to VMCU, including the STK MCU and the CPT device.
Figure 8.1. Measuring EFM8BB3-SLSTK2022A Current Using AEM
8.1 Usage
The AEM data is collected by the board controller and can be displayed by the energyAware Profiler, available through Simplicity Studio. By using the energyAware Profiler, current consumption and voltage can be measured in realtime.
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Advanced Energy Monitor
8.2 AEM Theory of Operation
In order to be able to accurately measure current ranging from 0.1 µA to 50 mA (114 dB dynamic range), a current sense amplifier is
utilized together with a dual gain stage. 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. Digital filtering and averaging is done within the Board Controller before the samples are exported to the
Energy Profiler application.
During startup of the kit, an automatic calibration of the AEM is performed. This calibration compensates for the offset error in the sense
amplifiers.
Figure 8.2. Advanced Energy Monitor
8.3 AEM Accuracy and Performance
The AEM is capable of measuring currents in the range of 0.1 µA to 50 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 produces 6250 current
samples per second.
Note: The current measurement will only be correct when powering the EFM8 from USB power through the debugger (power select
switch set to DBG or AEM).
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Board Controller
9. Board Controller
The kit contains a board controller that is responsible for performing various board-level tasks, such as handling the debugger and the
Advanced Energy Monitor. An interface is provided between the EFM8 and the board controller in the form of a UART connection. The
connection is enabled by setting the EFM_BC_EN (P2.2) line high, and using the lines EFM_BC_TX (P0.4) and EFM_BC_RX (P0.5) for
communicating.
The BC enable signal connects the EFM8 to the board controller:
• 0: EFM8 UART pins are isolated from the Board Controller.
• 1: EFM8 UART pins are connected to the Board Controller (default upon reset).
Note: The board controller is only available when USB power is connected.
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UG125: EFM8BB3-SLSTK2022A User's Guide
Debugging
10. Debugging
The EFM8BB3-SLSTK2022A contains an integrated debugger, which can be used to download code and debug the Busy Bee EFM8
MCU. In addition to programming the MCU on the kit, the debugger can also be used to program and debug external Silicon Labs
EFM8 devices.
10.1 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 EFM8 MCU on the kit, by
setting the debug mode to [In]. A summary of the different supported debug modes is given in Table 10.1 Debug Modes on page 18.
Table 10.1. Debug Modes
Mode
Description
Debug MCU
In this mode the on-board debugger is connected to the EFM8 on the EFM8BB3-SLSTK2022A.
Debug In
In this mode, the on-board debugger is disconnected, and an external debugger can be connected to debug the
EFM8 on the EFM8BB3-SLSTK2022A.
Debug Out
In this mode, the on-board debugger can be used to debug an EFM8 mounted on a custom board.
Selecting the active debug mode is done with a drop-down menu in the Kit Manager tool, which is available through Simplicity Studio.
When using the debug adapter in the [Out] mode, the end device must be manually detected before debugging and programming. To
do this:
1. Right-click on the kit from the Simplicity Studio launch screen and select [Select Target Part...].
2. If needed, select the appropriate [Target Interface] for the external device. For example, EFM8 devices will use the [C2] selection.
3. In the same dialog, click the [Detect Target] button.
4. Click [OK] to close the dialog. The external target can now be debugged and programmed.
10.2 Debugging during Battery Operation
When the EFM8 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.
To enable debugging when the USB cable is removed, connect an external debugger to the MCU Debug Header in the top right corner
of the EFM8BB3-SLSTK2022A instead of the Debug IN/OUT Connector. This header is connected directly to the EFM8's debug interface. The pinout of this header is shown in the Connectors chapter.
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Upgrading the Kit
11. Upgrading the Kit
Upgrading the kit firmware is done through Simplicity Studio in the [Launcher] perspective. Simplicity Studio will automatically check for
new updates on startup. After selecting a kit in the left under [Devices], the area at the top of the Launcher page displays the current kit
version and Debug Mode. Use the links in this area to change the debug mode or upgrade the kit firmware.
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UG125: EFM8BB3-SLSTK2022A User's Guide
Schematics, Assembly Drawings, and BOM
12. Schematics, Assembly Drawings, and BOM
The schematics, assembly drawings and bill of materials (BOM) for the EFM8BB3 Starter Kit board are available through Simplicity
Studio when the kit documentation package has been installed. These files are also available from the links below.
• EFM8BB3 Starter Kit (STK) BOM
• EFM8BB3 Starter Kit (STK) Schematic
12.1 Board Revision History
•
•
•
•
•
A00 — Initial prototype revision.
A01 — Cleaned up the signal generator circuit and updated silk print.
A02 — Updated EFM8BB3 device revision and adjusted the reset switch.
A03 — Changed D801 to “not mounted”. Changed X900 to KDS DSX321G.
A04 — Updated EFM8BB3 device revision.
A00 Revision Boards
There are no known issues with the A00 boards.
A01 Revision Boards
There are no known issues with the A01 boards.
A02 Revision Boards
There are no known issues with the A02 boards.
A03 Revision Boards
There are no known issues with the A03 boards.
A04 Revision Boards
There are no known issues with the A04 boards.
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UG125: EFM8BB3-SLSTK2022A User's Guide
Revision History
13. Revision History
Revision 0.6
February, 2019
• Updated 12.1 Board Revision History for Rev A04
Revision 0.5
April, 2018
• Updated 6.1 Breakout Pads with the correct pin numbers for J101 and J102.
• Updated 12.1 Board Revision History for Rev A03.
Revision 0.4
January, 2018
• Updated 6.2 Expansion Header with the correct pin label for EXP13.
Revision 0.3
June, 2016
•
•
•
•
•
•
Updated screenshots and instructions for Simplicity Studio v4.
Added 12.1 Board Revision History.
Added the UG125 document reference.
Added a note to 6.3 Debug Connector that VTARGET is required.
Added the reference for the direct debug connector to 6.4 Direct Debug Connector.
Added a note about high loading on the DISP CLK signal.
Revision 0.2
September, 2015
• Updated board pictures.
Revision 0.1
June, 2015
• Initial revision.
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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 to the product information, specifications, and descriptions herein, and does not give warranties as to the accuracy or completeness of the included information.
Without prior notification, Silicon Labs may update product firmware during the manufacturing process for security or reliability reasons. Such changes will not alter the specifications or the
performance of the product. Silicon Labs shall have no liability for the consequences of use of the information supplied in this document. This document does not imply or expressly grant
any license to design or fabricate any integrated circuits. The products are not designed or authorized to be used within any FDA Class III devices, applications for which FDA premarket
approval is required or Life Support Systems 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. Silicon Labs disclaims all express and implied warranties and shall not be responsible or liable for any injuries or damages related to use of a Silicon Labs product in such
unauthorized applications.
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