Silicon Labs8-bit MCU - Silicon LabsSimplicity Studio - Silicon Labs
Silicon LabsRelative Humidity and Temperature Sensors - Silicon LabsSimplicity Studio - Silicon Labs8-bit MCU - Silicon Labs
User Guide for SILICON LABS models including: EFM8 BB50 8-bit MCU Pro Kit Microcontroller, EFM8 BB50, 8-bit MCU Pro Kit Microcontroller, Pro Kit Microcontroller, Kit Microcontroller, Microcontroller
BB50-PK5208A - EFM8 BB50 8-bit MCU Pro Kit - Silicon Labs
2023-09-06 — UG549: BB50 Pro Kit User's Guide. The BB50 Pro Kit is an excellent starting point to become familiar with the EFM8BB50™ Busy Bee Microcontroller. The pro kit ...
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DocumentDocumentUG549: BB50 Pro Kit User's Guide The BB50 Pro Kit is an excellent starting point to become familiar with the EFM8BB50TM Busy Bee Microcontroller. The pro kit contains sensors and peripherals demonstrating some of the EFM8BB50's many capabilities. The kit provides all necessary tools for developing an EFM8BB50 Busy Bee application. TARGET DEVICE · EFM8BB50 Busy Bee Microcontroller (EFM8BB50F16I-A-QFN16) · CPU: 8-bit CIP-51 8051 Core · Memory: 16 kB flash and 512 bytes RAM · Oscillators: 49 MHz, 10 MHz, and 80 kHz KIT FEATURES · USB connectivity · Advanced Energy Monitor (AEM) · SEGGER J-Link on-board debugger · Debug Multiplexer supporting external hardware as well as on-board MCU · User push button and LED · Silicon Labs' Si7021 Relative Humidity and Temperature Sensor · Ultra-low power 128x128 pixel Memory LCD · 8-direction analog joystick · 20-pin 2.54 mm header for expansion boards · Breakout pads for direct access to I/O pins · Power sources include USB and CR2032 coin cell battery SOFTWARE SUPPORT · Simplicity StudioTM silabs.com | Building a more connected world. Copyright © 2023 by Silicon Laboratories Rev. 1.0 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.3 Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2. Kit Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3. Kit Hardware Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4. Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4.1 Breakout Pads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4.2 EXP Header . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 4.3 Debug Connector (DBG) . . . . . . . . . . . . . . . . . . . . . . . . . .11 4.4 Simplicity Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 5. Power Supply and Reset . . . . . . . . . . . . . . . . . . . . . . . . . . 13 5.1 MCU Power Selection . . . . . . . . . . . . . . . . . . . . . . . . . . .13 5.2 Board Controller Power . . . . . . . . . . . . . . . . . . . . . . . . . . .13 5.3 EFM8BB50 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14 6. Peripherals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 6.1 Push Button and LED. . . . . . . . . . . . . . . . . . . . . . . . . . . .15 6.2 Joystick . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16 6.3 Memory LCD-TFT Display . . . . . . . . . . . . . . . . . . . . . . . . . .17 6.4 Si7021 Relative Humidity and Temperature Sensor . . . . . . . . . . . . . . . . .18 6.5 Virtual COM Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19 7. Advanced Energy Monitor . . . . . . . . . . . . . . . . . . . . . . . . . 20 7.1 Usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 7.2 Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 7.3 Accuracy and Performance . . . . . . . . . . . . . . . . . . . . . . . . . .20 8. On-Board Debugger . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 8.1 Debug Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22 8.2 Debugging During Battery Operation . . . . . . . . . . . . . . . . . . . . . .23 9. Kit Configuration and Upgrades . . . . . . . . . . . . . . . . . . . . . . . 24 9.1 Firmware Upgrades . . . . . . . . . . . . . . . . . . . . . . . . . . . .24 10. Schematics, Assembly Drawings, and BOM . . . . . . . . . . . . . . . . . . 25 11. Kit Revision History and Errata . . . . . . . . . . . . . . . . . . . . . . . 26 11.1 Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26 11.2 Errata . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26 silabs.com | Building a more connected world. Rev. 1.0 | 2 12. Document Revision History . . . . . . . . . . . . . . . . . . . . . . . . 27 silabs.com | Building a more connected world. Rev. 1.0 | 3 1. Introduction UG549: BB50 Pro Kit User's Guide Introduction 1.1 Description The BB50 Pro Kit is an ideal starting point for application development on the EFM8BB50 Busy Bee Microcontrollers. The board features sensors and peripherals, demonstrating some of the many capabilities of the EFM8BB50 Busy Bee Microcontroller. Additionally, the board is a fully featured debugger and energy monitoring tool that can be used with external applications. 1.2 Features · EFM8BB50 Busy Bee Microcontroller · 16 kB Flash · 512 bytes RAM · QFN16 package · Advanced Energy Monitoring system for precise current and voltage tracking · Integrated Segger J-Link USB debugger/emulator with the possiblity to debug external Silicon Labs devices · 20-pin expansion header · Breakout pads for easy access to I/O pins · Power sources include USB and CR2032 battery · Silicon Labs' Si7021 Relative Humidity and Temperature Sensor · Ultra-low power 128x128 pixel Memory-LCD · 1 push button and 1 LED connected to EFM8 for user interaction · 8-direction analog joystick for user interaction 1.3 Getting Started Detailed instructions for how to get started with your new BB50 Pro Kit can be found on the Silicon Labs Web pages: silabs.com/development-tools/mcu/8-bit silabs.com | Building a more connected world. Rev. 1.0 | 4 2. Kit Block Diagram An overview of the BB50 Pro Kit is shown in the figure below. UG549: BB50 Pro Kit User's Guide Kit Block Diagram Debug USB Connector Board Controller DEBUG UART EXP Header EFM8BB50 MCU Si7021 I2C Temperature & Humidity Sensor ADC0 Joystick Figure 2.1. Kit Block Diagram silabs.com | Building a more connected world. Rev. 1.0 | 5 3. Kit Hardware Layout The BB50 Pro Kit layout is shown below. Debug USB Connector 128x128 Pixel Memory LCD UG549: BB50 Pro Kit User's Guide Kit Hardware Layout Debug Connector Simplicity Connector Relative Humidity & Temperature Sensor EFM8BB50 MCU CR2032 Battery Holder Expansion Header EFM8 Reset Button Power Source Switch Push Button LED Figure 3.1. BB50 Pro Kit Hardware Layout Analog Joystick silabs.com | Building a more connected world. Rev. 1.0 | 6 4. Connectors UG549: BB50 Pro Kit User's Guide Connectors 4.1 Breakout Pads Most of the EFM8BB50's GPIO pins are available on two pin header rows at the top and bottom edges of the board. These have a standard 2.54 mm pitch, and pin headers can be soldered in if required. In addition to the I/O pins, connections to power rails and ground are also provided. Note that some of the pins are used for kit peripherals or features and may not be available for a custom application without tradeoffs. The figure below shows the pinout of the breakout pads and the pinout of the EXP header on the right edge of the board. The EXP header is further explained in the next section. The breakout pad connections are also printed in silkscreen next to each pin for easy reference. 5V GND NC RST C2CK C2D NC NC NC NC P1.2 P1.1 P1.0 P2.0 GND 3V3 J102 Debug Simplicity Connector Connector 1 16 1 16 2 20 1 19 EXP Header 3V3 5V P1.1 P0.5 P0.4 NC NC NC NC VMCU Board ID SDA Board ID SCL P1.2 NC NC NC P0.7 P0.3 P0.2 GND VMCU GND NC NC NC NC P0.7 P0.6 P0.5 P0.4 P0.3 P0.2 P0.1 P0.0 GND 3V3 J101 Figure 4.1. Breakout Pads and Expansion Header The table below shows the pin connections of the breakout pads. It also shows which kit peripherals or features are connected to the different pins. Table 4.1. Bottom Row (J101) Pinout Pin EFM8BB50 I/O pin Shared Feature 1 VMCU EFM8BB50 voltage domain (measured by AEM) 2 GND Ground 3 NC 4 NC 5 NC 6 NC 7 P0.7 EXP7, UIF_JOYSTICK 8 P0.6 MCU_DISP_SCLK 9 P0.5 EXP14, VCOM_RX silabs.com | Building a more connected world. Rev. 1.0 | 7 Pin EFM8BB50 I/O pin Shared Feature 10 P0.4 EXP12, VCOM_TX 11 P0.3 EXP5, UIF_LED0 12 P0.2 EXP3, UIF_BUTTON0 13 P0.1 MCU_DISP_CS 14 P0.0 VCOM_ENABLE 15 GND Ground 16 3V3 Board controller supply Table 4.2. Top Row (J102) Pinout UG549: BB50 Pro Kit User's Guide Connectors Pin EFM8BB50 I/O pin Shared Feature 1 5V Board USB voltage 2 GND Ground 3 NC 4 RST DEBUG_RESETN (DEBUG_C2CK Shared Pin) 5 C2CK DEBUG_C2CK (DEBUG_RESETN Shared Pin) 6 C2D DEBUG_C2D (DEBUG_C2DPS, MCU_DISP_ENABLE Shared Pin) 7 NC 8 NC 9 NC 10 NC 11 P1.2 EXP15, SENSOR_I2C_SCL 12 P1.1 EXP16, SENSOR_I2C_SDA 13 P1.0 MCU_DISP_MOSI 14 P2.0 MCU_DISP_ENABLE (DEBUG_C2D, DEBUG_C2DPS Shared Pin) 15 GND Ground 16 3V3 Board controller supply silabs.com | Building a more connected world. Rev. 1.0 | 8 UG549: BB50 Pro Kit User's Guide Connectors 4.2 EXP Header On the right side of the board, an angled 20-pin EXP 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 EFM8BB50 Busy Bee's features. Additionally, the VMCU, 3V3, and 5V power rails are also exposed. The connector follows a standard which ensures that commonly used peripherals such as a SPI, UART, and I2C bus are available on fixed locations on the connector. The rest of the pins are used for general purpose I/O. This layout allows the definition of expansion boards that can plug into a number of different Silicon Labs kits. The figure below shows the EXP header pin assignment for the BB50 Pro Kit. Because of limitations in the number of available GPIO pins, some of the EXP header pins are shared with kit features. 3V3 20 5V 18 P1.1 16 P0.5 14 P0.4 12 NC 10 NC 8 NC 6 NC 4 VMCU 2 19 BOARD_ID_SDA 17 BOARD_ID_SCL 15 P1.2 13 NC 11 NC 9 NC 7 P0.7 5 P0.3 3 P0.2 1 GND EFM8 I/O Pin Pin Connection 20 3V3 18 5V 16 P1.1 14 P0.5 12 P0.4 10 NC 8 NC 6 NC 4 NC 2 VMCU Reserved (Board Identification) Figure 4.2. EXP Header Table 4.3. EXP Header Pinout EXP Header Function Shared Feature Peripheral Mapping Board controller supply Board controller USB voltage I2C_SDA SENSOR_I2C_SDA SMB0_SDA UART_RX VCOM_RX UART0_RX UART_TX VCOM_TX UART0_TX GPIO GPIO GPIO GPIO EFM8BB50 voltage domain, included in AEM measurements. 19 BOARD_ID_SDA 17 BOARD_ID_SCL 15 P1.2 13 NC 11 NC 9 NC silabs.com | Building a more connected world. Connected to Board Controller for identification of add-on boards. Connected to Board Controller for identification of add-on boards. I2C_SCL SENSOR_I2C_SCL SMB0_SCL GPIO GPIO GPIO Rev. 1.0 | 9 Pin Connection 7 P0.7 5 P0.3 3 P0.2 1 GND EXP Header Function JOYSTICK LED BTN Shared Feature UIF_JOYSTICK UIF_LED0 UIF_BUTTON0 Ground UG549: BB50 Pro Kit User's Guide Connectors Peripheral Mapping silabs.com | Building a more connected world. Rev. 1.0 | 10 UG549: BB50 Pro Kit User's Guide Connectors 4.3 Debug Connector (DBG) The debug connector serves a dual purpose, based on the debug mode, which can be set up using Simplicity Studio. If the "Debug IN" mode is selected, the connector allows an external debugger to be used with the on-board EFM8BB50. If the "Debug OUT" mode is selected, the connector allows the kit to be used as a debugger towards an external target. If the "Debug MCU" mode (default) is selected, the connector is isolated from the debug interface of both the board controller and the on-board target device. Because this connector is automatically switched to support the different operating modes, it is only available when the board controller is powered (J-Link USB cable connected). If debug access to the target device is required when the board controller is unpowered, this should be done by connecting directly to the appropriate pins on the breakout header. The pinout of the connector follows that of the standard ARM Cortex Debug 19-pin connector. The pinout is described in detail below. Note that even though the connector supports JTAG in addition to Serial Wire Debug, it does not necessarily mean that the kit or the on-board target device supports this. VTARGET 1 GND 3 GND 5 NC 7 Cable Detect 9 NC 11 NC 13 GND 15 GND 17 GND 19 2 TMS / SWDIO / C2D 4 TCK / SWCLK / C2CK 6 TDO / SWO 8 TDI / C2Dps 10 RESET / C2CKps 12 NC 14 NC 16 NC 18 NC 20 NC Figure 4.3. Debug Connector Even though the pinout matches the pinout of an ARM Cortex Debug connector, these are not fully compatible as pin 7 is physically removed from the Cortex Debug connector. Some cables have a small plug that prevents 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 4.4. Debug Connector Pin Descriptions Pin Number(s) 1 2 4 6 8 10 12 14 16 18 20 9 11, 13 3, 5, 15, 17, 19 Function Note VTARGET Target reference voltage. Used for shifting logical signal levels between target and debugger. TMS / SDWIO / C2D JTAG test mode select, Serial Wire data or C2 data TCK / SWCLK / C2CK JTAG test clock, Serial Wire clock or C2 clock TDO/SWO JTAG test data out or Serial Wire output TDI / C2Dps JTAG test data in, or C2D "pin sharing" function RESET / C2CKps Target device reset, or C2CK "pin sharing" function NC TRACECLK NC TRACED0 NC TRACED1 NC TRACED2 NC TRACED3 Cable detect Connect to ground NC Not connected GND silabs.com | Building a more connected world. Rev. 1.0 | 11 UG549: BB50 Pro Kit User's Guide Connectors 4.4 Simplicity Connector The Simplicity Connector featured on the BB50 Pro Kit enables advanced debugging features such as the AEM and Virtual COM port to be used towards an external target. The pinout is illustrated in the figure below. VMCU 1 3V3 3 5V 5 GND 7 GND 9 GND 11 GND 13 GND 15 Board ID SCL 17 Board ID SDA 19 2 Virtual COM TX 4 Virtual COM RX 6 Virtual COM CTS 8 Virtual COM RTS 10 NC 12 NC 14 NC 16 NC 18 NC 20 NC Figure 4.4. Simplicity Connector The signal names in the figure and the pin description table are referenced from the board controller. This means that VCOM_TX should be connected to the RX pin on the external target, VCOM_RX to the target's TX pin, VCOM_CTS to the target's RTS pin, and VCOM_RTS to the target's CTS pin. 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, put the on-board MCU in its lowest energy mode to minimize its impact on the measurements. Table 4.5. Simplicity Connector Pin Descriptions Pin Number(s) 1 3 5 2 4 6 8 17 19 10, 12, 14, 16, 18, 20 7, 9, 11, 13, 15 Function VMCU 3V3 5V VCOM_TX VCOM_RX VCOM_CTS VCOM_RTS BOARD_ID_SCL BOARD_ID_SDA NC GND Description 3.3 V power rail, monitored by the AEM 3.3 V power rail 5 V power rail Virtual COM TX Virtual COM RX Virtual COM CTS Virtual COM RTS Board ID SCL Board ID SDA Not connected Ground silabs.com | Building a more connected world. Rev. 1.0 | 12 5. Power Supply and Reset UG549: BB50 Pro Kit User's Guide Power Supply and Reset 5.1 MCU Power Selection The EFM8BB50 on the pro kit can be powered by one of these sources: · The debug USB cable · 3 V coin cell battery The power source for the MCU is selected with the slide switch in the lower left corner of the pro kit. The figure below shows how the different power sources can be selected with the slide switch. Advanced Energy Monitor BAT AEM Debug USB 5 V Connector LDO 3.3 V Advanced SENSE Monitor AEM BAT VMCU 3 V Lithium Battery ( CR2032 ) EFM8 Figure 5.1. Power Switch With the switch in the AEM position, a low noise 3.3 V LDO on the pro kit is used to power the EFM8BB50. This LDO is again powered from the debug USB cable. The Advanced Energy Monitor is now connected in series, allowing accurate high-speed current measurements and energy debugging/profiling. 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 MCU with an external power source. Note: The Advanced Energy Monitor can only measure the current consumption of the EFM8BB50 when the power selection switch is in the AEM position. 5.2 Board Controller Power The board controller is responsible for important features, such as the debugger and the AEM, 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 EFM8BB50 device will continue to operate in the BAT mode. silabs.com | Building a more connected world. Rev. 1.0 | 13 UG549: BB50 Pro Kit User's Guide Power Supply and Reset 5.3 EFM8BB50 Reset The EFM8BB50 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 EFM8BB50 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. silabs.com | Building a more connected world. Rev. 1.0 | 14 UG549: BB50 Pro Kit User's Guide Peripherals 6. Peripherals The pro kit has a set of peripherals that showcase some of the EFM8BB50 features. Note that most EFM8BB50 I/Os routed to peripherals are also routed to the breakout pads or the EXP header, which must be taken into consideration when using these I/Os. 6.1 Push Button and LED The kit has a user push button marked BTN0, which is connected directly to the EFM8BB50 and is debounced by RC filters with a time constant of 1 ms. The button is connected to pin P0.2. The kit also features a yellow LED marked LED0, which is controlled by a GPIO pin on the EFM8BB50. The LED is connected to pin P0.3 in an active-high configuration. P0.3 (GPIO) P0.2 (GPIO) UIF_LED0 UIF_BUTTON0 User Button & LED EFM8 Figure 6.1. Button and LED silabs.com | Building a more connected world. Rev. 1.0 | 15 UG549: BB50 Pro Kit User's Guide Peripherals 6.2 Joystick The kit has an analog joystick with 8 measureable positions. This joystick is connected to the EFM8 on the P0.7 pin and uses different resistor values to create voltages measurable by the ADC0. P0.7 EFM8 VMCU 10 k UIF_JOYSTICK NW N NE W E Joystick SW S SE 15 k 100 10 k 33 k 60.4 k Figure 6.2. Joystick Table 6.1. Joystick Resistor Combinations Direction Resistors Combinations (k) Center press 0.1 0.1 + 10 Up (N) Up-Right (NE) 60.4 60.4 + 10 (N // E ) (N // E ) + 10 = 21.34 21.34 + 10 Right (E) Down-Right (SE) 33 33 + 10 (S // E ) (S // E ) + 10 = 7.67 7.67 + 10 Down (S) Down-Left (SW) 10 10 + 10 (S // W ) (S // W ) + 10 = 6 6 + 10 Left (W) Up-Left (NW) 15 15 + 10 (N // W ) (N // W ) + 10 = 12.01 12.01 + 10 Note: 1. These calculated values assume a VMCU of 3.3 V. Expected UIF_JOYSTICK Voltage (V)1 0.033 2.831 2.247 2.533 1.433 1.650 1.238 1.980 1.801 silabs.com | Building a more connected world. Rev. 1.0 | 16 UG549: BB50 Pro Kit User's Guide Peripherals 6.3 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 x 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 continuous refreshing is required to maintain a static image. The display interface consists of a 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's 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 (EFM8BB50) has control of the display Power to the display is sourced from the target application power domain when the EFM8BB50 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. 3 P0.6 (SPI0_SCK) P1.0 (SPI0_MOSI) P0.1 (GPIO) P2.0 (GPIO) EFM8 0: Board Controller controls display 1: EFM8 controls display Figure 6.3. 128x128 Pixel Memory LCD silabs.com | Building a more connected world. Rev. 1.0 | 17 UG549: BB50 Pro Kit User's Guide Peripherals 6.4 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 EXP header. The sensor is powered by VMCU, which means the sensor's current consumption is included in the AEM measurements. VMCU P1.2 (SMB0_SCL) P1.1 (SMB0_SDA) VDD SENSOR_I2C_SCL SENSOR_I2C_SDA Si7021 Temperature & Humidity Sensor EFM8 Figure 6.4. Si7021 Relative Humidity and Temperature Sensor Refer to the Silicon Labs web pages for more information: http://www.silabs.com/humidity-sensors. silabs.com | Building a more connected world. Rev. 1.0 | 18 UG549: BB50 Pro Kit User's Guide Peripherals 6.5 Virtual COM Port An asynchronous serial connection to the board controller is provided for application data transfer between a host PC and the target EFM8BB50, which eliminates the need for an external serial port adapter. P0.4 (UART0_TX) P0.5 (UART0_RX) VCOM_TX VCOM_RX Isolation Switch Board Controller USB Host Computer P0.0 (GPIO) VCOM_EN EFM8 Figure 6.5. 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. The UART interface consists of two pins and an enable signal. Table 6.2. Virtual COM Port Interface Pins Signal VCOM_TX VCOM_RX VCOM_ENABLE Description Transmit data from the EFM8BB50 to the board controller Receive data from the board controller to the EFM8BB50 Enables the VCOM interface, allowing data to pass through to the board controller Note: The VCOM port is only available when the board controller is powered, which requires the J-Link USB cable to be inserted. silabs.com | Building a more connected world. Rev. 1.0 | 19 7. Advanced Energy Monitor UG549: BB50 Pro Kit User's Guide Advanced Energy Monitor 7.1 Usage The Advanced Energy Monitor (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 EFM8BB50 in realtime. 7.2 Theory of Operation To accurately measure current ranging from 0.1 µA to 47 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. 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 kit startup, an automatic calibration of the AEM is performed, which compensates for the offset error in the sense amplifiers. 5V LDO 3.3V 4.7 Sense Resistor Power Select Switch VMCU AEM Processing Current Sense Amplifier G0 Multiple Gain Stages G1 EFM8 Peripherals Figure 7.1. Advanced Energy Monitor 7.3 Accuracy and Performance The AEM is capable of measuring currents in the range of 0.1 µA to 47 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. Although 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. silabs.com | Building a more connected world. Rev. 1.0 | 20 UG549: BB50 Pro Kit User's Guide On-Board Debugger 8. On-Board Debugger The BB50 Pro Kit contains an integrated debugger, which can be used to download code and debug the EFM8BB50. In addition to programming the EFM8BB50 on the kit, the debugger can also be used to program and debug external Silicon Labs EFM32, EFM8, EZR32, and EFR32 devices. The debugger supports three different debug interfaces used with Silicon Labs devices: · Serial Wire Debug, which is used with all EFM32, EFR32, and EZR32 devices · JTAG, which can be used with EFR32 and some EFM32 devices · C2 Debug, which is used with EFM8 devices To ensure accurate debugging, use the appropriate debug interface for your device. The debug connector on the board supports all three of these modes. silabs.com | Building a more connected world. Rev. 1.0 | 21 UG549: BB50 Pro Kit User's Guide On-Board Debugger 8.1 Debug Modes To program external devices, use the debug connector to connect to a target board and set the debug mode to [Out]. The same connector can also be used to connect an external debugger to the EFM8BB50 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 EFM8BB50 on the kit. Host USB Computer Board Controller EFM8BB50 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. Host USB Computer Board Controller EFM8BB50 DEBUG HEADER External Hardware 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 EFM8BB50 on the kit. Host USB Computer Board Controller EFM8BB50 DEBUG HEADER External Debug Probe Figure 8.3. Debug IN Note: For "Debug IN" to work, the kit board controller must be powered through the Debug USB connector. silabs.com | Building a more connected world. Rev. 1.0 | 22 UG549: BB50 Pro Kit User's Guide On-Board Debugger 8.2 Debugging During Battery Operation When the EFM8BB50 is battery-powered 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, make direct connections to the GPIOs used for debugging, which are exposed on the breakout pads. silabs.com | Building a more connected world. Rev. 1.0 | 23 UG549: BB50 Pro 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. To download Simplicity Studio, go to silabs.com/simplicity. In the main window of the Simplicity Studio's Launcher perspective, the debug mode and firmware version of the selected J-Link adapter are shown. Click the [Change] link next to any of these settings to open the kit configuration dialog. Figure 9.1. Simplicity Studio Kit Information Figure 9.2. Kit Configuration Dialog 9.1 Firmware Upgrades You can upgrade the kit firmware 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. 1.0 | 24 UG549: BB50 Pro Kit User's Guide Schematics, Assembly Drawings, and BOM 10. 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. They are also available from the kit page on the Silicon Labs website: silabs.com. silabs.com | Building a more connected world. Rev. 1.0 | 25 11. Kit Revision History and Errata UG549: BB50 Pro Kit User's Guide Kit Revision History and Errata 11.1 Revision History The kit revision can be found printed on the box label of the kit, as outlined in the figure below. BB50 Pro Kit BB50-PK5208A 09-06-23 115100149 A01 Figure 11.1. Revision Information Table 11.1. BB50-PK5208A Kit Revision History Kit Revision A01 Released 9 June 2023 Description Initial kit revision. 11.2 Errata There are no known errata at present. silabs.com | Building a more connected world. Rev. 1.0 | 26 12. Document Revision History Revision 1.0 June 2023 Initial document version. UG549: BB50 Pro Kit User's Guide Document Revision History silabs.com | Building a more connected world. Rev. 1.0 | 27 Simplicity Studio One-click access to MCU and wireless tools, documentation, software, source code libraries & more. Available for Windows, Mac and Linux! IoT Portfolio www.silabs.com/IoT SW/HW www.silabs.com/simplicity Quality www.silabs.com/quality Support & Community www.silabs.com/community 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. 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