Silicon Laboratories C8051F970 User manual

Rev. 0.1 5/14 Copyright © 2014 by Silicon Laboratories C8051F970DK-UG
C8051F970DK-UG
C8051F970 DEVELOPMENT KIT USER’SGUIDE
1. Introduction
The C8051F970 Development Kit provides an evaluation and development platform for the C8051F97x MCUs.
The board has a particular focus on capacitive sensing to highlight the 43 Capacitive Sense input channels
available on the C8051F970 MCU.
1.1. Key Features
The key features of the C8051F970 Development Kit are:
Silicon Labs EFM32 C8051F970 microcontroller with 32 kB flash and 8 kB RAM.
Capacitive sensing 4 x 5 button matrix and slider highlight the unique Capacitive Sense module.
Isolated power domains for the LEDs and the MCU to enable easy power measurement.
Port headers for prototyping of custom hardware.
Figure 1. C8051F970 Target Board
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2. Relevant Documents
This document provides a hardware overview for the C8051F970 Target Board in the Development Kit. Additional
information on Simplicity Studio, Capacitive Sense Profiler, and the Capacitive Sense firmware library can be found
in the documents listed in this section.
2.1. Getting Started
For step-by-step information on getting started with the C8051F970 DK, see the C8051F970 Development Kit
Quick Start Guide. This document can be accessed in Simplicity Studio by selecting or detecting a C8051F97x
device and clicking the Quick Start Guide button.
2.2. Simplicity Studio
Simplicity Studio can be downloaded from www.silabs.com/simplicity-studio. More information on Simplicity Studio
can be found in the included help (HelpHelp Contents or HelpSearch) or in the following document:
AN0822: Simplicity Studio User's Guide — Contains basic information, tips, and tricks for using
Simplicity Studio.
This document can be found at www.silabs.com/8bit-appnotes or using the Application Notes tile in Simplicity
Studio.
2.3. Capacitive Sense
The Capacitive Sense Profiler and Capacitive Sense library are documented in:
AN0828: Capacitive Sensing Library Overview — An overview of the capacitive sensing library,
including basic tips and tricks on using the profiler tool.
AN0829: Capacitive Sensing Library Configuration Guide — Describes how to configure the capacitive
sensing library for different application requirements
These documents can be found at www.silabs.com/8bit-appnotes or using the Application Notes tile in Simplicity
Studio.
2.4. Application Notes
All 8-bit Application Notes can be found at www.silabs.com/8bit-appnotes or using the Application Notes tile in
Simplicity Studio.
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3. Hardware Setup
Refer to Figure 2 for a diagram of the hardware configuration.
1. Connect the USB Debug Adapter to the 10-pin debug connector (DEBUG, H8) on the MCU card using the
10-pin ribbon cable.
2. Connect the USB Debug Adapter to a USB Port on the PC.
3. Ensure the VDD Select switch (SW1) is in the top VREG position.
4. Verify that the JP3 power measurement jumper is populated.
5. Power the board through the power connector (P1) using the supplied 9 V ac/dc adapter.
Notes:
Use the Reset button in the IDE to reset the target when connected using a USB Debug Adapter.
Remove power from the target 5oard and the USB Debug Adapter before connecting or disconnecting the
ribbon cable from the target board. Connecting or disconnecting the cable when the devices have power
can damage the device and/or the USB Debug Adapter.
Figure 2. Hardware Setup
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4. Software Setup
Simplicity Studio greatly reduces development time and complexity with Silicon Labs EFM32 and 8051 MCU
products by providing a high-powered IDE, tools for hardware configuration, and links to helpful resources, all in
one place.
Once Simplicity Studio is installed, the application itself can be used to install additional software and
documentation components to aid in the development and evaluation process.
Figure 3. Simplicity Studio
The following Simplicity Studio components are required for the C8051F970 Development Kit:
8051 Products Part Support
Simplicity Developer Platform
Download and install Simplicity Studio from www.silabs.com/8bit-software or www.silabs.com/simplicity-studio.
Once installed, run Simplicity Studio by selecting StartSilicon LabsSimplicity StudioSimplicity Studio
from the start menu or clicking the Simplicity Studio shortcut on the desktop. Follow the instructions to install the
software and click Simplicity IDE to launch the IDE.
The first time the project creation wizard runs, the Setup Environment wizard will guide the user through the
process of configuring the build tools and SDK selection.
In the Part Selection step of the wizard, select from the list of installed parts only the parts to use during
development. Choosing parts and families in this step affects the displayed or filtered parts in the later device
selection menus. Choose the C8051F97x family by checking the C8051F97x check box. Modify the part selection
at any time by accessing the Part Management dialog from the WindowPreferencesSimplicity
StudioPart Management menu item.
Simplicity Studio can detect if certain toolchains are not activated. If the Licensing Helper is displayed after
completing the Setup Environment wizard, follow the instructions to activate the toolchain.
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4.1. Loading a Demo
To download a demo to the board:
1. Click the Detect Connected Device button from the Simplicity Studio home screen.
2. Click the Demos tile from the Simplicity Studio home screen.
3. Select the desired demo from the list. For example, click the Capactive Sense (No Overlay) demo for
download to the board. A description of the demo and instructions are available in the lower area of the
window.
4. Click the Start button. This will download the demo to the board and start it running.
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4.2. Building the Blinky Example
Each project has its own source files, target configuration, SDK configuration, and build configurations such as the
Debug and Release build configurations. The IDE can be used to manage multiple projects in a collection called a
workspace. Workspace settings are applied globally to all projects within the workspace. This can include settings
such as key bindings, window preferences, and code style and formatting options. Project actions, such as build
and debug are context sensitive. For example, the user must select a project in the Project Explorer view in order
to build that project.
To create a project based on the Blinky example:
1. Click the Software Examples tile from the Simplicity Studio home screen.
2. In the Kit drop-down, select C8051F970 Development Kit, in the Part drop-down, select C8051F970, and
in the SDK drop-down, select the desired SDK. Click Next.
3. Select Example and click Next.
4. Under C8051F970 Development Kit in the Blinky folder, select F97x Blinky and click Finish.
5. Click on the project in the Project Explorer and click Build, the hammer icon in the top bar. Alternatively,
go to ProjectBuild Project.
6. Click Debug to download the project to the hardware and start a debug session.
7. Press the Resume button to start the code running. The LED should blink.
8. Press the Suspend button to stop the code.
9. Press the Reset the device button to reset the target MCU.
10. Press the Disconnect button to return to the development perspective.
4.3. Simplicity Studio Help
Simplicity Studio includes detailed help information and device documentation within the tool. The help contains
descriptions for each dialog window. To view the documentation for a dialog, click the question mark icon in the
window:
This will open a pane specific to the dialog with additional details.
The documentation within the tool can also be viewed by going to HelpHelp Contents or HelpSearch.
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4.4. CP210x USB to UART VCP Driver Installation
The target board includes a Silicon Labs CP210x USB-to-UART Bridge Controller. Device drivers for the CP210x
need to be installed before the PC software can communicate with the MCU through the UART interface.
Download the latest drivers from the website (www.silabs.com/vcpdrivers).
1. Download the drivers from the website and unzip the files to a location and run the appropriate installer for
the system (x86 or x64).
2. Accept the license agreement and follow the steps to install the driver on the system. The installer will let
you know when your system is up to date. The driver files included in this installation have been certified by
Microsoft.
3. To complete the installation process, connect the included USB cable between the host computer and the
USB connector (J9) on the target board. Windows will automatically finish the driver installation.
Information windows will pop up from the taskbar to show the installation progress.
If needed, the driver files can be uninstalled by selecting Windows Driver Package—Silicon
Laboratories... option in the Programs and Features window.
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5. C8051F970 Target Board Overview
The C8051F970 target board enables application development on the C8051F97x MCU device family. Figure 4
and Figure 5 highlight the C8051F970 target board features.
Figure 4. C8051F970 Target Board Features—Front
Potentiometer
Push-Button Switches
USB Connector
for VCP
Power Adapter
Debug Connector
Reset Button
LEDs
VCP-Enabled LED
Power LED
Current Measure Jumper Port Access
VDD Select Switch
LEDs
Capacitive Sense
Slider
Capacitive Sense
Button Matrix CR2032 Battery
Holder
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Figure 5. C8051F970 Target Board Features—Back
5.1. Push-Button Switches and LEDs (S1-2, DS8-13)
The C8051F970 target board has two push-button switches and six LEDs. The switches are normally open and pull
the pin voltage to ground when pressed. The LEDs connect to VDD through a current-limiting resistor and turn on
when the corresponding port pin is low.
Each pin has a zero ohm resistor that can be used to disconnect the switches and LEDs from the GPIO pins.
Table 1. Switch and LED Pin Descriptions
MCU Pin Function
P1.2 Red LED DS8 (LED12)
P1.3 Red LED DS9 (LED13)
P1.4 Red LED DS10 (LED14)
P1.6 Red LED DS11 (LED16)
P0.5 Red LED DS12 (LED05)
P1.5 Red LED DS13 (LED15)
P0.4 Switch S1 (BTN04)
P0.3 Switch S2 (BTN03)
External Oscillator
Components
CP210x USB-to-
UART VCP Bridge
Optional Pin
Isolation Resistors
AAA Battery
Holder
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5.2. Potentiometer (R12)
The potentiometer is available on P5.0. To use the potentiometer, install a shorting block on JP5 to connect P5.0 to
the potentiometer.
The potentiometer is referenced to P0.0, which is the voltage reference pin. Since the voltage reference can only
source ~250 µA, the simplest way to use the potentiometer is to turn on the P0.0 driver and set it to a logic high
using the port registers. The most accurate way to use the potentiometer is to externally connect P0.0 to VDD.
5.3. Capacitive Sense Buttons (CS20-27, CS30-37, CS40-47)
The capacitive sensing buttons demonstrate the C8051F970 Capacitive Sense module for use with buttons and
sliders. More information on the capacitive sense library can be found in 2.3. "Capacitive Sense‚" on page 2.
5.4. Power (SW1, J1, and J2)
The VDD power supply has three power options: on-board +3.3 V or +1.8 V regulator power, battery power, or off.
The VDD Select switch (SW1) is used to select between the two options.
The +3.3 V or +1.8 V regulator power option is the upper VREG position and allows the board to be powered from
a diode-OR of three power sources: 9 V Power Adapter (P1), the USB connector (J9), or the USB Debug Adapter
(H8). Once the VDD Select switch is in the VREG position, the VREG Select header (J1) selects between +3.3 V
or +1.8 V.
The middle VBATT option allows the board to be powered from either two AAA batteries (BH1) or a CR2032 coin
cell (BH2). When the VDD Select switch is in the VBATT position, J2 selects between a CR2032 or two AAA
batteries
The bottom OFF option disconnects the board power.
5.5. Power LED (D6)
The blue power LED provides visual feedback when the board is powered through USB, the 9 V power adapter, or
the USB Debug Adapter. This LED is not tied to the battery power net to conserve energy. The power LED
indicates that power is available on the board and the VDD Power Select switch must be configured properly to
power the MCU.
5.6. Power Measurement Jumper (JP3)
The power measurement jumper (JP3) allows for easy access to measure the VDD current of the MCU. The
shorting block for this header is populated by default. The side labeled VMCU is the side isolated to the
C8051F970 MCU. To measure the supply current, remove the corresponding shorting block and connect a current
measurement device across the unpopulated header.
The voltage supply prior to the jumper is the VDD net, which supplies all of the external LEDs, switches, USB
COM, and reset pull-up. The VDD_MCU net after the jumper only connects to the MCU.
5.7. Debug Header (H8)
The shrouded 10-pin debug header supports the Silicon Labs USB Debug Adapter. This connector provides a C2
debug connection to the C8051F970 on the target board.
5.8. Reset Button (S3)
The reset push-button switch is to the right of the debug header (H8). Pushing this button will always reset the
MCU. Note that pushing this button while the IDE is connected to the MCU will result in the IDE disconnecting from
the target.
5.9. LED Supply (JP4)
The LED supply separates the LED power from the rest of the board. Disabling the LEDs removes their power
consumption without having to modify firmware.
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