Silicon Laboratories Thunderboard EFM8UB3 Manual de usuario

UG308: Thunderboard EFM8UB3 User's

Guide

The Thunderboard EFM8UB3 is a low cost, small form factor de-

velopment and evaluation platform for the EFM8™ Universal Bee

Microcontroller.

The Thunderboard contains an EFM8UB3 MCU together with an on-board SEGGER J-

Link debugger for easy debugging through the USB Micro-B debugging connector. All of

the EFM8 I/Os are routed to breakout pads on the sides of the board making it easy to

expand on the board features and evaluate the EFM8 Universal Bee's features with cus-

tom hardware.

TARGET DEVICE

• EFM8 Universal Bee Microcontroller

(EFM8UB31F40G-A-QFN24)

• Pipelined 8-bit C8051 core with 48 MHz

maximum operating frequency

• 40 kB flash memory and 3328 bytes RAM

• USB feature set

KIT FEATURES

• USB connectivity

• SEGGER J-Link on-board debugger

• Virtual COM port

• User RGB LED and pushbuttons

• 2.54 mm breakout pads to EFM8

• Flat flexible cable connector for external

Silicon Labs "postage-stamp" sized

boards

• Optional Mini-Simplicity connector for

Advanced Energy Monitoring using

external Silicon Labs debugger

SOFTWARE SUPPORT

• Simplicity Studio™

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

Table of Contents

1. Introduction ................................3

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

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

1.3 Kit Hardware Layout............................3

2. Electrical Specifications ...........................4

2.1 Absolute Maximum Ratings .........................4

3. Hardware .................................5

3.1 Block Diagram..............................5

3.2 Power Supply ..............................6

3.2.1 Self-Powered Mode ..........................6

3.2.2 Bus-Powered Mode ..........................6

3.3 Universal Serial Bus ............................7

3.4 Push Buttons and RGB LED .........................7

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

3.6 EFM8 Reset ..............................8

3.7 Connectors ...............................9

3.7.1 Breakout Pads ...........................10

3.7.2 Mini Simplicity Connector ........................11

3.7.3 EFM8 USB Micro-B Connector ......................11

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

3.7.5 Flat Flexible Cable Connector ......................12

4. Debugging ............................... 13

4.1 On-board Debugger Considerations ......................13

4.2 Virtual COM Port .............................14

4.3 Mini Simplicity Connector ..........................14

5. Kit Configuration and Upgrades ....................... 15

5.1 Firmware Upgrades ............................15

6. Schematics, Assembly Drawings and BOM ................... 16

7. Kit Revision History and Errata ....................... 17

7.1 Revision History .............................17

7.2 Errata ................................17

8. Board Revision History and Errata ...................... 18

8.1 Revision History .............................18

8.2 Errata ................................18

9. Document Revision History ......................... 19

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

1. Introduction

The Thunderboard EFM8UB3 (OPN: SLTB005A) is an excellent starting point to get familiar with the EFM8 Universal Bee Microcontrol-

lers. The Thunderboard contains an EFM8UB3 MCU together with an on-board SEGGER J-Link debugger for easy programming and

debugging through the USB Micro-B debug connector. The debugger also provides a USB virtual COM port for serial connection to the

target application.

All of the EFM8 I/Os are routed to breakout pads on the sides of the board making it easy to expand on the board features and evaluate

the EFM8 Universal Bee's features with custom hardware.

1.1 Kit Contents

The following items are included in the box:

• 1x Thunderboard EFM8UB3 board (BRD5002A)

• 1x Micro USB 2.0 to USB A male cable

1.2 Getting Started

Detailed instructions for how to get started with your new Thunderboard EFM8UB3 can be found on the Silicon Labs web pages:

http://www.silabs.com/start-efm8

1.3 Kit Hardware Layout

The layout of the Thunderboard EFM8UB3 is shown below.

30 mm

45 mm

USB Micro-B Debug Connector

- Virtual COM port

- Debug access

Breakout Pads

USB Micro-B Connector

- Connected to EFM8

Reset Button

Push Button 1 Push Button 0

Mini Simplicity

Connector

Power Source

Slide Switch

EFM8

Universal Bee 3

On-board USB

J-Link Debugger

Top view Bottom view

Flat Flexible Cable

Connector

RGB LED

{

2.54 mm pitch

Figure 1.1. Thunderboard EFM8UB3 Hardware Layout

UG308: Thunderboard EFM8UB3 User's Guide

Introduction

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2. Electrical Specifications

2.1 Absolute Maximum Ratings

Parameter Condition Min Typ Max Unit

Input voltage on EFM8 USB connector -0.3 - +5.8 V

Input voltage on debug USB connector 0 - +5.5 V

Output current Power-Source switch = EFM8 USB - - 100 mA

Power-Source switch = DBG USB - - 300 mA

Voltage on any breakout pad (excluding

P0.4, P0.5, P2.0 and RST)

VMCU > 3.3 V -0.3 - 5.8 V

VMCU < 3.3 V -0.3 - VMCU + 2.5 V

Voltage on P0.4, P0.5, P2.0 and RST

breakout pad 1

-0.3 - VMCU + 0.3 V

Current per EFM8 I/O pin -100 - 100 mA

Total current for all EFM8 I/O pins -400 - 400 mA

1 Limited by the debugger.

UG308: Thunderboard EFM8UB3 User's Guide

Electrical Specifications

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3. Hardware

3.1 Block Diagram

An overview of the Thunderboard EFM8UB3 is illustrated in the figure below.

Mini-Simplicity

Connector

(Not mounted)

EFM8UB3

Microcontroller

USB Micro-B

Connector

J-Link

Debugger

USB Micro-B

Connector

Power Source

Switch

Power

User Buttons

& RGB LED

Breakout Pads

(EXP-Header pinout)

Flat Flexible

Cable Connector

DBG USB VBUS

EFM8 USB VBUS

C2 Debug

Virtual COM

USB

Figure 3.1. Kit Block Diagram

UG308: Thunderboard EFM8UB3 User's Guide

Hardware

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3.2 Power Supply

The EFM8 on the kit can be bus-powered, using its internal 5V-to-3.3 V regulator to provide power to itself and the VMCU net, or the

EFM8 can be self-powered with its internal regulator disabled. In self-powered mode, the EFM8 and the VMCU net are powered by an

on-board low-dropout regulator. Configuring the kit is done using the slide switch marked "Power Source" located in the lower right

corner of the board.

3.2.1 Self-Powered Mode

When the "Power Source" slide switch is in the "DBG USB" position, the EFM8 is connected in self-powered mode with its internal

regulator disabled. In this configuration, the EFM8 and the VMCU net are powered by an on-board regulator, which draws power from

the USB Micro-B debugging connector. The low-dropout regulator has a total output current capacity of 300 mA, in which some is being

used to power the on-board debugger through the 3V3 net.

LDO

VDDVREGIN

EFM8 USB

VBUS

VMCU

DBG USB

LDO

5V 3V3

Power Source

DBG

USB

LDO

VDDVREGIN

VBUS

EFM8UB3

Figure 3.2. Self-powered Mode

3.2.2 Bus-Powered Mode

When the "Power Source" slide switch is in the "EFM8 USB" position, the EFM8 is connected in bus-powered mode. In this configura-

tion, the EFM8 and the VMCU net are powered by the EFM8UB3's internal 5V-to-3.3 V regulator. The input of the internal regulator

(VREGIN) is connected to the VBUS line of the USB Micro-B connector that is connected to the EFM8's USB peripheral.

Isolated from VMCU

LDO

VDDVREGIN

EFM8 USB

VBUS

VMCU

DBG USB

LDO

5V 3V3

Power Source

EFM8

USB

EFM8UB3

Figure 3.3. Bus-powered Mode

UG308: Thunderboard EFM8UB3 User's Guide

Hardware

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3.3 Universal Serial Bus

The Thunderboard EFM8UB3 board is equipped with a USB Micro-B connector interfacing with the EFM8's USB peripheral. The figure

below shows how the USB lines are connected to the MCU. Note that the figure shows the bus-powered configuration, applicable when

the "Power Source" slide switch is in the "EFM8 USB" position. When the switch is in the "DBG USB" position, VREGIN is disconnected

from the VBUS-line and VDD is shorted to VREGIN. For more information, see Section 3.2 Power Supply.

USB Micro-B

Connector

LDO

VDDVREGIN

P2.1/VBUS

VMCU

D+

D-

VBUS

D-

D+

Bus-powered configuration shown

(switch in EFM8 USB position).

Power Source

EFM8

USB

EFM8UB3

EFM8 USB

Figure 3.4. Universal Serial Bus

3.4 Push Buttons and RGB LED

The kit has two user push buttons marked BTN0 and BTN1. They are connected directly 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.

The kit also features an RGB LED placed between the two push buttons that is controlled by GPIO pins on the EFM8. The LEDs are

connected in an active-low configuration, and each color can be PWM controlled using the EFM8's Programmable Counter Array

(PCA0) peripheral to generate a wide variety of colors.

User Buttons

& RGB LED

EXP11_LED_RED

EXP7_LED_GREEN

EXP9_LED_BLUE

BUTTON0

[PCA0_CEX2] P1.6

[PCA0_CEX1] P1.4

[PCA0_CEX0] P1.5

P0.2

P0.3 BUTTON1

EFM8UB3

Figure 3.5. Buttons and LEDs

UG308: Thunderboard EFM8UB3 User's Guide

Hardware

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3.5 On-board Debugger

The Thunderboard EFM8UB3 contains a microcontroller separate from the EFM8 Universal Bee that provides the user with a on-board

J-Link debugger through the USB micro-B debugging port. This microcontroller is referred to as the "On-board Debugger", and is not

programmable by the user.

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.

Figure 3.6 On-Board Debugger Connections on page 8 shows the connections between the target EFM8 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 section 4. Debugging and section 5. Kit Configuration and Upgrades for more details on debugging.

Mini Simplicity

Connector

RSTb/C2CK

C2D/P2.0

P0.4 [UART1_TX]

P0.5 [UART1_RX]

On-Board

J-Link

Debugger

EXP12_UART_TX

EXP14_UART_RX

EFM8_C2CK

EFM8_C2D

Host

PC USB

EFM8UB3

Figure 3.6. On-Board Debugger Connections

3.6 EFM8 Reset

The EFM8 MCU can be reset by a few different sources:

• A user pressing the RESET button.

• The on-board debugger pulling the EFM8 RSTb pin low.

• An external debugger pulling the EFM8 RSTb pin low.

In addition to the reset sources mentioned above, the debugger will also issue a reset to the EFM8 when starting up. This means that

removing power to the debugger (unplugging the USB Micro-B cable) will not generate a reset, but plugging the cable back in will cause

a reset as the debugger starts up.

UG308: Thunderboard EFM8UB3 User's Guide

Hardware

silabs.com | Building a more connected world. Rev. 1.0 | 8

3.7 Connectors

Featured on the Thunderboard EFM8UB3 is a Mini Simplicity connector, two USB Micro-B connectors, a ribbon connector, and 24

breakout pads. Of the breakout pads, 20 follow the Silicon Labs EXP header pinout that provides a fixed feature set across Silicon Labs

starter kits.

The placement and pinout of the connectors can be seen in the figure below. See the following sub chapters for additional information

on the connectors.

Breakout Pads

Hirose FH12-6S-0.5SH(55)

EXP2 - VMCU

EXP4 - SPI_MOSI - P1.0

EXP18 - 5V

EXP20 - 3V3

EXP6 - SPI_MISO - P0.7

EXP8 - SPI_SCLK - P0.6

EXP10 - SPI_CS - P1.1

EXP12 - UART_TX - P0.4

EXP14 - UART_RX - P0.5

EXP16 - I2C_SDA - P1.2

GND - EXP1

P0.0 - UART_CTS - EXP3

P0.1 - UART_RTS - EXP5

P1.4 - EXP7

P1.5 - EXP9

P1.6 - EXP11

P2.1 - EXP13

P1.3 - I2C_SCL - EXP15

BOARD_ID_SCL - EXP17

BOARD_ID_SDA - EXP19

P0.3 - BUTTON1

P0.2 - BUTTON0

C2CK / RSTb

C2D - P2.0

DBG USB

Micro-B

Connector

EFM8 USB

Micro-B

Connector

Mini Simplicity

Connector

Top Side

Flat Flexible Cable Connector

(on reverse side)

VMCU

SENSOR_OUT

GND

I2C_SDA

I2C_SCL

SENSOR_TAMPER

Mini Simplicity

Connector

2 1

VMCU

RST

P0.4 - VCOM_TX

P2.0 - C2D

GND

VCOM_RX - P0.5

Not in use by EFM8

C2CK - RSTb/C2CK

Breakout Pads

Figure 3.7. Thunderboard EFM8UB3 Connectors

UG308: Thunderboard EFM8UB3 User's Guide

Hardware

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3.7.1 Breakout Pads

The board provides access to every I/O pin of the EFM8 through 24 breakout pads. Twelve of these are located along the left side of

the board while the remaining twelve are located on the right side of the board. The breakout pads contain a number of I/O pins that

can be used with most of the EFM8 Universal Bee's features. Additionally, the VMCU (EFM8 power rail), 3.3V (debug LDO regulator

output), and 5V power rails are also exported.

20 of the breakout pads are pinned out similar to the EXP header found on Silicon Labs Starter Kits, which ensures that commonly

used peripherals such as SPI, UART and I2C buses are available on fixed locations. The rest of the pins are used for general purpose

IO. This allows the definition of expansion boards that can can be used in conjunction with a number of different Silicon Labs starter

kits.

The pin-routing on the EFM8 is very flexible, so most peripherals can be routed to any pin. However, some pins are shared between the

breakout pads and other functions on the Thunderboard EFM8UB3. The table below shows an overview of the breakout pads and func-

tionality that is shared with the kit.

Note: The breakout tab labeled P2.1 in the silkscreen (number 9 on the left side) is connected to a resistor divider on the EFM8 USB

VBUS line. Voltages above VMCU may appear on this pad.

Table 3.1. Breakout Pads Pinout

Number EFM8 Connection EXP Header Pin Shared Feature on Kit Peripheral Mapping

Left Side Breakout Pads (top to bottom)

1 P0.2 - Button

2 P0.3 - Button

3 GND EXP1 - Ground Ground

4 P0.0 EXP3 SENSOR_OUT

5 P0.1 EXP5 SENSOR_TAMPER

6 P1.4 EXP7 LED PCA0_CEX0

7 P1.5 EXP9 LED PCA0_CEX1

8 P1.6 EXP11 LED PCA0_CEX2

9 1P2.1 / VBUS EXP13 Connected to EFM8 USB 5V through resistor divider

10 P1.3 EXP15 - I2C_SCL SENSOR_SCL SMBUS0_SCL

11 NC EXP17 - Connected to Board Controller for identification of add-on boards

12 NC EXP19 - Connected to Board Controller for identification of add-on boards

Right Side Breakout Pads (top to bottom)

1 C2D / P2.0 - C2D

2 RSTb / C2CK - C2CK / RST

3 VDD EXP2 - VMCU EFM8 voltage domain, included in AEM measurements

4 P1.0 EXP4 - SPI_MOSI SPI0_MOSI

5 P0.7 EXP6 - SPI_MISO SPI0_MISO

6 P0.6 EXP8 - SPI_SCLK SPI0_SCK

7 P1.1 EXP10 - SPI_CS SPI0_NSS

8 P0.4 EXP12 - UART_TX Virtual COM Port UART1_TX0

9 P0.5 EXP14 - UART_RX Virtual COM Port UART1_RX0

10 P1.2 EXP16 - I2C_SDA SENSOR_SDA SMBUS0_SDA

UG308: Thunderboard EFM8UB3 User's Guide

Hardware

silabs.com | Building a more connected world. Rev. 1.0 | 10

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