Silicon Laboratories EFM8BB2-SLSTK2021A User Manual
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Silicon Laboratories EFM8BB2-SLSTK2021A User Manual

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UG237: EFM8BB2-SLSTK2021A User's
Guide
The EFM8BB2-SLSTK2021A is an excellent starting point to get
familiar with the EFM8 Busy Bee microcontrollers.
The kit contains sensors and peripherals demonstrating some of the MCU's many capa-
bilities. The kit can also serve as a starting point for application development.
The kit includes the following:
• EFM8BB2 Busy Bee Starter Kit Board
• 1 x CR2032 battery
silabs.com | Building a more connected world.
• Getting Started card
• 1 x mini USB cable
KEY FEATURES
• EFM8BB22F16G MCU with 16 KB Flash
and 2 KB RAM.
• 20-pin expansion header.
• Power sources include USB and CR2032
battery.
• 2 user buttons, 1 tri-color LED.
• 8-direction joystick.
• Ultra low power 128x128 pixel Memory-
LCD.
Rev. 0.4

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Summary of Contents for Silicon Laboratories EFM8BB2-SLSTK2021A

  • Page 1 UG237: EFM8BB2-SLSTK2021A User's Guide The EFM8BB2-SLSTK2021A is an excellent starting point to get familiar with the EFM8 Busy Bee microcontrollers. KEY FEATURES • EFM8BB22F16G MCU with 16 KB Flash The kit contains sensors and peripherals demonstrating some of the MCU's many capa- and 2 KB RAM.

  • Page 2: Getting Started

    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 EFM8BB2-SLSTK2021A 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 EFM8BB2 Starter Kit.
  • Page 3 Kit Block Diagram 2. Kit Block Diagram An overview of the EFM8BB2 Starter Kit is shown in the figure below. Board EFM8BB2 Controller Microcontroller Joystick Figure 2.1. EFM8BB2-SLSTK2021A Block Diagram silabs.com | Building a more connected world. Rev. 0.4 | 3...

  • Page 4: Kit Hardware Layout

    Joystick Buttons User LED Figure 3.1. EFM8BB2-SLSTK2021A 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...
  • Page 5 UG237: EFM8BB2-SLSTK2021A User's Guide Kit Hardware Layout MCU Port Pin Port Pin Assigned Primary Board Connec- Secondary Board Con- Expansion Port Con- Function tion nection nection (EXP) P1.7 ADC / CMP Joystick P2.0 GPIO BC - Enable P2.1 UART1 TX...
  • Page 6 Power Supply and Reset 4. Power Supply and Reset 4.1 MCU Power Selection The Busy Bee MCU on the EFM8BB2-SLSTK2021A is designed to be powered by three different sources: • Through the on-board debugger. • By a 3 V Battery.
  • Page 7 UG237: EFM8BB2-SLSTK2021A 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.
  • Page 8 UG237: EFM8BB2-SLSTK2021A User's Guide 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.
  • Page 9 UG237: EFM8BB2-SLSTK2021A User's Guide 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.
  • Page 10 UG237: EFM8BB2-SLSTK2021A 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.
  • Page 11 UG237: EFM8BB2-SLSTK2021A User's Guide 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.
  • Page 12 UG237: EFM8BB2-SLSTK2021A User's Guide Connectors Peripheral Peripheral pin MCU Pin EXP Header pin number Comparator 0 CMP0P Positive Input Any supported pin (see Reference Manual for more information) Multiple CMP0N Negative In- Any supported pin (see Reference Manual for more information)
  • Page 13 UG237: EFM8BB2-SLSTK2021A User's Guide 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.

  • Page 14: Integrated Development Environment

    UG237: EFM8BB2-SLSTK2021A User's Guide 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.

  • Page 15: Advanced Energy Monitor

    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 EFM8BB2-SLSTK2021A 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 Stu- dio.
  • Page 16 UG237: EFM8BB2-SLSTK2021A User's Guide 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.
  • Page 17 UG237: EFM8BB2-SLSTK2021A User's Guide 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 (P2.0) line high, and using the lines EFM_BC_TX (P0.4) and EFM_BC_RX (P0.5) for...
  • Page 18 10. Debugging The EFM8BB2-SLSTK2021A 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.

  • Page 19: Upgrading The Kit

    UG237: EFM8BB2-SLSTK2021A User's Guide 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.

  • Page 20: Schematics, Assembly Drawings, And Bom

    UG237: EFM8BB2-SLSTK2021A 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 EFM8BB2 Starter Kit board are available through Simplicity Studio when the kit documentation package has been installed.

  • Page 21: Revision History

    UG237: EFM8BB2-SLSTK2021A User's Guide Revision History 13. Revision History 13.1 Revision 0.4 January, 2018 • Updated 6.2 Expansion Header with the correct pin label for EXP13. 13.2 Revision 0.3 June, 2016 • Updated screenshots and instructions for Simplicity Studio v4.
  • Page 22 Trademark Information 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...
  • Page 23 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Silicon Laboratories SLSTK2021A...

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