Silicon Laboratories BB52 Explorer Kit User manual

UG512: BB52 Explorer Kit User's Guide

The BB52 Explorer Kit is an ultra-low cost, small form factor devel-

opment and evaluation platform for the EFM8BB52 Busy Bee 8-bit

microcontroller.

The BB52 Explorer Kit is focused on rapid prototyping and concept creation of multi-pur-

pose applications. It is designed around the EFM8BB52 MCU, which is an ideal device

family for developing energy-friendly embedded applications.

The kit features a USB interface, an on-board SEGGER J-Link debugger, one user-LED

and button, and support for hardware add-on boards via a mikroBUS™ socket and a

Qwiic® connector. The hardware add-on support allows developers to create and proto-

type applications using a virtually endless combination of off-the-shelf boards from mik-

roE, sparkfun, AdaFruit, and Seeed Studios.

TARGET DEVICE

• EFM8BB52 Busy Bee 8-bit microcontroller

(EFM8BB52F32I-C-QFN32R)

•Pipelined 8-bit C8051 core with 50 MHz

maximum operating frequency

• 32 kB flash and 2304 bytes RAM

KIT FEATURES

• User LED and push button

• 2.54 mm breakout pads

•mikroBUS™ socket

• Qwiic® connector

• SEGGER J-Link on-board debugger

• Virtual COM port

• USB-powered

SOFTWARE SUPPORT

• Simplicity Studio™

ORDERING INFORMATION

• BB52-EK2701A

Table of Contents

1. Introduction ................................

1.1 Kit Contents ...............................3

1.2 Getting Started ..............................3

1.3 Hardware Content .............................3

1.4 Kit Hardware Layout ............................4

2. Specifications ...............................5

2.1 Recommended Operating Conditions ......................5

2.2 Current Consumption ............................5

3. Hardware .................................6

3.1 Block Diagram ..............................6

3.2 Power Supply ..............................7

3.3 EFM8BB52 Reset .............................7

3.4 Push Button and LED............................7

3.5 On-board Debugger ............................8

3.6 Connectors ...............................8

3.6.1 Breakout Pads ............................9

3.6.2 MikroBUS Socket ...........................10

3.6.3 Qwiic Connector ............................11

3.6.4 Debug USB Micro-B Connector .......................11

4. Debugging ...............................12

4.1 On-board Debugger ............................12

4.2 Virtual COM Port .............................12

5. Schematics, Assembly Drawings, and BOM ...................13

6. Kit Revision History ............................14

7. Board Revision History and Errata ......................15

7.1 Revision History .............................15

7.2 Errata .................................15

silabs.com | Building a more connected world. Rev. 1.0 | 2

1. Introduction

The BB52 Explorer Kit has been designed to inspire customers to explore the Silicon Labs EFM8BB52 Busy Bee 8-bit microcontroller.

The kit includes a mikroBUS™ socket and Qwiic® connector, allowing users to add features to the kit with a large selection of off-the-

shelf boards.

Programming the BB52 Explorer Kit is easily done using a USB Micro-B cable and the on-board J-Link debugger. A USB virtual COM

port provides a serial connection to the target application. The BB52 Explorer Kit is supported in Simplicity Studio™ and a Board Sup-

port Package (BSP) is provided to give application developers a flying start.

Connecting external hardware to the BB52 Explorer Kit can be done using the breakout pads which present peripherals from the

EFM8BB52 Busy Bee such as I2C, SPI, UART and GPIOs. The mikroBUS socket allows inserting mikroBUS add-on boards which in-

terface with the EFM8BB52 through SPI, UART or I2C. The Qwiic connector can be used to connect hardware from the Qwiic Connect

System through I2C.

1.1 Kit Contents

The following items are included in the box:

• 1x BB52 Explorer Kit board (BRD2701A)

1.2 Getting Started

Detailed instructions for how to get started with your new BB52 Explorer Kit can be found on the Silicon Labs web pages:

silabs.com/dev-tools

1.3 Hardware Content

The following key hardware elements are included on the BB52 Explorer Kit:

• EFM8BB52 Busy Bee MCU with 50 MHz operating frequency, 32 kB kB flash, and 2304 bytes RAM

• One LED and one push button

• On-board SEGGER J-Link debugger for easy programming and debugging, which includes a USB virtual COM port

• MikroBUS™ socket for connecting Click boards™ and other mikroBUS add-on boards

• Qwiic® connector for connecting Qwiic Connect System hardware

• Breakout pads for GPIO access and connection to external hardware

• Reset button

UG512: BB52 Explorer Kit User's Guide

Introduction

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1.4 Kit Hardware Layout

The layout of the BB52 Explorer Kit is shown below.

Top View

Push Button

35.6 mm

55.9 mm

Reset Button

Breakout Pads

USB Micro-B Connector

- Virtual COM port

- Debug access

- Packet trace

LED

Qwiic

Connector

EFM8BB52

On-board USB

J-Link Debugger

mikroBUS Socket

Figure 1.1. BB52 Explorer Kit Hardware Layout

UG512: BB52 Explorer Kit User's Guide

Introduction

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2. Specifications

2.1 Recommended Operating Conditions

Parameter Symbol Min Typ Max Unit

USB Supply Input Voltage VUSB - 5.0 - V

Supply Input Voltage (VMCU supplied externally) 1 , 2VVMCU 1.8 3.3 3.6 V

Operating Temperature TOP - 20 - ˚C

1 Not recommended for use with rechargeable Lithium batteries. Most Li-Ion and Li-Po cells exceed 3.6 V when fully charged

2 When using the provided interfaces with add-on boards or other external hardware, tighter voltage limits might apply

2.2 Current Consumption

The operating current of the board greatly depends on the application and the amount of external hardware connected. The table below

attempts to give some indication of typical current consumptions for the EFM8BB52 and the on-board debugger. Note that the numbers

are taken from the data sheets for the devices. For a full overview of the conditions that apply for a specific number from a data sheet,

the reader is encouraged to read the specific data sheet.

Table 2.1. Current Consumption

Parameter Symbol Condition Typ Unit

EFM8BB52 Current Con-

sumption1

IBB MCU current consumption in NORMAL mode (module

supply voltage = 3.3 V, f_SYSCLK = 49 MHz using

HFOSC, TAMB 25 ˚C)

2.79 mA

MCU current consumption in SNOOZE mode (module

supply voltage = 3.3 V, LFOSC running at 80 kHz, TAMB

25 ˚C)

9.3 µA

MCU current consumption in SHUTDOWN mode (module

supply voltage = 3.3 V, TAMB 25 ˚C)

0.24 µA

On-board Debugger Sleep

Current Consumption 2

IDBG On-board debugger current consumption when USB cable

is not inserted (EFM32GG12 EM4S mode current con-

sumption)

80 nA

1 From EFM8BB52 data sheet

2From EFM32GG12 data sheet

UG512: BB52 Explorer Kit User's Guide

Specifications

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3. Hardware

The core of the BB52 Explorer Kit is the EFM8BB52 Busy Bee 8-bit microcontroller. Refer to section 1.4 Kit Hardware Layout for place-

ment and layout of the hardware components.

3.1 Block Diagram

An overview of the BB52 Explorer Kit is illustrated in the figure below.

Expandability

Debugging

J-Link

Debugger

USB Micro-B

Connector

Button and LED

EFM8BB52

Breakout Pads

Temperature

& Humidity

Sensor

Ambient

Light & UV

Sensor

Hall Effect

Sensor

User Button

& LED

Serial Flash

External connectivity

Qwiic

Connector

mikroBUS

Socket

Figure 3.1. Kit Block Diagram

UG512: BB52 Explorer Kit User's Guide

Hardware

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3.2 Power Supply

The kit is powered by the debug USB cable as illustrated in the figure below.

USB Micro-B LDO

5V0

IN OUT

Automatic

Isolation

3V3

VMCU

EFM8BB52

8-bit MCU

Peripherals

Figure 3.2. BB52 Explorer Kit Power Topology

The 5 volt power net on the USB bus is regulated down to 3.3 V using an LDO (low-dropout regulator). An automatic isolation circuit

isolates the LDO when the USB cable is not plugged in.

Power can be injected externally on the VMCU net if the USB cable is removed and no other power sources are present on the kit.

Failure to follow this guideline can cause power conflicts and damage the LDO.

3.3 EFM8BB52 Reset

The EFM8BB52 can be reset by a few different sources:

• A user pressing the RESET button.

• The on-board debugger pulling the #RESET pin low.

3.4 Push Button and LED

The kit has one user push button, marked BTN0, that is connected to a GPIO on the EFM8BB52. The button is connected to pin P0.2

and it is debounced by an RC filter with a time constant of 1 ms. The logic state of the button is high while the button is not being

pressed, and low when the button is pressed.

The kit also features one yellow LED, marked LED0, that is controlled by a GPIO pin on the EFM8BB52. The LED is connected to pin

P1.4 in an active-high configuration.

EFM8BB52

BB52_LED0

BB52_BUTTON0

User

Button & LED

P0.2

P1.4

Figure 3.3. Button and LED

UG512: BB52 Explorer Kit User's Guide

Hardware

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3.5 On-board Debugger

The BB52 Explorer Kit contains a microcontroller separate from the EFM8BB52 Busy Bee that provides the user with an on-board J-

Link debugger through the USB Micro-B port. This microcontroller is referred to as the "on-board debugger", and is not programmable

by the user. When the USB cable is removed, the on-board debugger goes into a very low power shutoff mode (EM4S).

In addition to providing code download and debug features, the on-board debugger also presents a virtual COM port for general pur-

pose application serial data transfer.

The figure below shows the connections between the target EFM8BB52 device and the on-board debugger. The figure also shows the

presence of the Mini Simplicity Connector, and how this is connected to the same I/O pins.

Please refer to chapter 4. Debugging for more details on debugging.

Mini Simplicity

Connector

RSTb/C2CK

P3.7/C2D

P0.4 (UARTx.TX)

P0.5 (UARTx.RX)

On-Board

J-Link

Debugger

VCOM_TX

VCOM_RX

DBG_C2CK

DBG_C2D

Host

PC USB

EFM8BB52

Figure 3.4. On-Board Debugger Connections

3.6 Connectors

The BB52 Explorer Kit features a USB Micro-B connector, breakout pads, a mikroBUS connector for connecting mikroBUS add-on

boards, and a Qwiic connector for connecting Qwiic Connect System hardware. The connectors are placed on the top side of the board,

and their placement and pinout are shown in the figure below. For additional information on the connectors, see the following sub chap-

ters.

P202

J201J202

P900

EFM8BB52

BUS

mikr o

U900

Breakout Pads

mikroBUS

Sockets

USB Micro-B

Connector

Qwiic

Connector

RSTb/C2CK

P3.7/C2D

RESET BUTTON

DBG C2D

DBG C2CK

GND

BUTTON0

QWIIC I2C SDA

QWIIC I2C SCL

P3.4

P3.3

P3.2

P1.5

P1.6

P2.2

P0.6

P2.3

P2.4

MikroBUS INT

MikroBUS PWM

MikroBUS UART RX

MikroBUS I2C SCL

MikroBUS I2C SDA

MikroBUS UART TX

SMBx

UARTx

TIMERx

P1.2

P1.1

GND

MikroBUS SPI MOSI

MikroBUS RST

MikroBUS ANALOG

VMCU

P1.0

P1.3

P0.7

P0.3

MikroBUS SPI MISO

MikroBUS SPI SCK

MikroBUS SPI CS

ADC0

SPI0

LED0

VCOM TX

VCOM RX

P1.7

P2.0

P2.6

P0.4

P0.5

P1.4

UARTx

P3.0

P3.1

P0.2

P0.1

P0.0

P2.5

P2.1

Figure 3.5. BB52 Explorer Kit Connectors

UG512: BB52 Explorer Kit User's Guide

Hardware

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3.6.1 Breakout Pads

34 breakout pads are provided and allow connection of external peripherals. The breakout pads are arranged in two rows and contain a

number of I/O pins that can be used with most of the EFM8BB52 Busy Bee's features. Additionally, the VMCU (main board power rail),

3V3 (LDO regulator output), and 5V power rails are also exposed on the pads.

The pin-routing on the Busy Bee is flexible, so most peripherals can be routed to any pin on port 1 or 2. However, pins may be shared

between the breakout pads and other functions on the BB52 Explorer Kit. The figure in section 3.6 Connectors includes an overview of

the breakout pads and functionality that is shared with the kit.

UG512: BB52 Explorer Kit User's Guide

Hardware

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3.6.2 MikroBUS Socket

The BB52 Explorer Kit features a mikroBUS™ socket compatible with mikroBUS add-on boards. MikroBUS add-on boards can expand

the functionality of the kit with peripherals such as sensors and LCDs. Add-on boards follow the mikroBUS socket pin mapping, and

communicates with the on-kit EFM8BB52 through UART, SPI or I2C. Several GPIOs are exposed on the mikroBUS socket. MikroBUS

add-on boards can be powered by the 5V or VMCU power rails, which are available on the mikroBUS socket.

The pinout of the EFM8BB52 on the kit is made such that all required peripherals are available on the mikroBUS socket. The I2C sig-

nals are, however, shared with the Qwiic connector, and all mikroBUS signals are also routed to adjacent breakout pads.

When inserting a mikroBUS add-on board, refer to the orientation notch on the BB52 Explorer Kit, shown in the figure below, to ensure

correct orientation. Add-on boards have a similar notch that needs to be lined up with the one shown below.

mikroBUS

socket

Orientation notch

Figure 3.6. mikroBUS Add-on Board Orientation

The table below gives an overview of the mikroBUS socket pin connections to the EFM8BB52.

Table 3.1. mikroBUS Socket Pinout

mikro-

BUS Pin

Name

mikroBUS Pin

Function

Connection Shared Feature Suggested Peripheral Mapping

AN Analog P0.3 BREAKOUT_RIGHT12 ADC0.CH1

RST Reset P0.7 BREAKOUT_RIGHT11

CS SPI Chip Select P1.3 BREAKOUT_RIGHT10 SPI0.NSS

SCK SPI Clock P1.0 BREAKOUT_RIGHT9 SPI0.SCK

MISO SPI Master Input

Slave Output

P1.1 BREAKOUT_RIGHT8 SPI0.MISO

MOSI SPI Master Output

Slave Input

P1.2 BREAKOUT_RIGHT7 SPI0.MOSI

PWM PWM output P2.4 BREAKOUT_LEFT16 TIMERx.Tx

INT Hardware Interrupt P0.6 BREAKOUT_LEFT15

RX UART Receive P2.3 BREAKOUT_LEFT14 UARTx.RX

TX UART Transmit P2.2 BREAKOUT_LEFT13 UARTx.TX

SCL I2C Clock P1.6 QWIIC_I2C_SCL, BREAKOUT_LEFT12 SMBx.SCL

SDA I2C Data P1.5 QWIIC_I2C_SDA, BREAK-

OUT_LEFT11

SMBx.SDA

UG512: BB52 Explorer Kit User's Guide

Hardware

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