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1. Kit Contents

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The Si1120 Evaluation Kit contains the following items:

Si1120 Evaluation Board

C8051F930 Target Board

Si1120EK Quick Start Guide

AC to DC Power Adapter

USB Debug Adapter (USB to Debug Interface)

2 USB Cables

2. Introduction

The Si1120EK is intended as an evaluation and development platform for the Si1120 infrared proximity and

ambient light sensor. Two PCBs are included in the kit: the Si1120 EVB shown in Figure 1, and the C8051F930-TB shown in Figure 2. Although the C8051F930-TB is part of the development kit, the documentation in this user’s

guide will focus on the Si1120 EVB and the example firmware. For more specific information on the C8051F930

TB, refer to the “C8051F930-DK User’s Guide”. The main components of the Si1120 EVB are the Si1120 sensor

(U1), the infrared emitters (D1 through D7), and header J1 which allows for selection between different infrared emitters on the board. On this PCB, the infrared emitters used are OSRAM part number SFH 4650-Z. These emitters have a power rating of 45 mW and a half-angle of 20 degrees. Other emitters with different characteristics may also be used, depending on the specific application requirements.

The example firmware for the kit measures the infrared light energy detected by the Si1120 while each of three infrared emitters are independently activated. The infrared light from these emitters will be reflected back to the

Si1120 by any object that is placed in proximity to the sensor. X, Y, and Z positions can be calculated from these measurements. If no object is close enough to the board, the measured signal levels will fall below pre-determined thresholds, and the position calculations will not update. The example firmware is intended to be used in conjunction with the Si1120 Performance Analysis Tool to provide user feedback. In addition to calculating the

current position, the firmware is able to detect different gestures from the infrared sensor, as described in Table 1 on page 5. The Si1120’s ambient light sensor (ALS) is also monitored by the firmware, which can determine the

type of ambient light present.

Note: The touchless infrared position detection implemented in the example is patent pending.

3. Getting Started

The Si1120 Evaluation Kit requires some PC software to be installed, as well as some basic hardware setup of the boards included in the kit.

3.1. Software Download and Installation

1. Browse to the Si1120 Evaluation Kit page at the URL http://www.silabs.com/Si1120EK .

2. Download and install the latest CP210x USB-to-UART Virtual COM Port (VCP) driver. This driver is necessary to establish serial communications with the board.

3. Download and install the latest version of the Optical Sensors Programmer’s Toolkit. The Si1120 Performance

Analysis Tool is part of this package, and is an integral part of the example firmware functionality.

4. (Optional) Download and install the Silicon Laboratories IDE and the Si1120 Evaluation Kit package. This will enable programming and debugging of the example source code. Note that the firmware is pre-loaded into the board during manufacturing. The IDE and board package are needed to upgrade or modify the firmware.

Rev. 0.3 7/13 Copyright © 2013 by Silicon Laboratories Si1120-EK

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3.2. Hardware Setup

1. Ensure the shorting blocks are configured for basic operation on both boards, as shown in Figure 1 and

Figure 2.

2. Connect the Si1120 EVB to the 96-pin connector on the C8051F930 TB.

3. Connect the USB Debug Adapter to the DEBUG connector on the C8051F930 TB with the 10-pin ribbon cable.

4. Connect one end of a USB cable to the USB connector on the USB Debug Adapter, and the other end to a USB

Port on the PC.

5. Verify that a shorting block is installed on J17 of the C8051F930 TB and that SW5 is in the ON position.

6. Connect the ac/dc power adapter to power jack P1 on the C8051F930 TB (Optional).

7. Connect one end of a USB cable to connector P3 on the C8051F930 TB, and the other end to a USB port on the PC. Note that the CP210x VCP drivers should have been installed during the software setup described in

“3.1. Software Download and Installation” . If the drivers are installed correctly, a dialog box will pop up notifying

the user that a new USB device has been found.

Refer to Figure 3 for the full hardware connection diagram.

D5 D6 D7 D1

J4

J2

U1

J9

VTX0

D2

SILICON LABS

Si1120 EVB

D3

VTX0

B1

J1

J3

D4

VDD

VTX0

P1

Figure 1. Si1120 Evaluation Board—Shorting Block Settings

P1

R15

J16

H1

P1.4

J15

GND

TOUCH SENSE SWITCH

P2.0

PORT2

PORT1

J6

TOUCH SENSE SWITCH

P2.1

P1.6

P1.5

SW2

P0.2

P0.3

SW3

USB POWER

P3

CP

2103

U3

J4

SILICON LABS www.silabs.com

C8051F930-TB

U1

J3

VDD/DC+

J5

J7

J8 J12

+1VD

F930

PORT0

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J2

J11

COIN_CELL

J13

J14

AAA_BAT

SW1

WALL_PWR

+3VD

VBAT

RESET

IMEASURE

J17

H2

VBAT

OFF

ON

SW5

J1

P2

SW4

J9

Figure 2. C8051F930 Target Board—Shorting Block and Switch Settings

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CP

210

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Communication with PC

C8051F930-TB

F930

P1

SILICON LABS

Si1120 EVB

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Debug

Connection to PC

AC/DC

Adapter

Figure 3. Hardware Setup

3.2.1. Si1120 EVB Header J1 Settings

To function properly with the demonstration firmware, the shorting blocks on header J1 should be set as indicated

in Figure 1. However, these can be set differently, according to the application. The corner emitter is fixed at D1,

but a shorting block point is provided for debug purposes. The “X” and “Y” axis emitters can each be moved

between three different positions on the board, as shown in Figure 4.

Select Corner Emitter

(D1 Only)

Select “X”

Axis Emitter

D1

D7

D6

D5

Select “Y”

Axis Emitter

D2

D3

D4

J1

Figure 4. Header J1 Setup

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4. Software Overview

There are several software packages available to support the example firmware that is pre-loaded on the board.

The primary package that is required for functionality is the Si1120 Performance Analysis Tool, which can be used to collect data from the board over the USB interface and display it graphically on screen.

Optional software packages include the Silicon Labs Integrated Development Environment (IDE), and the Si1120

Evaluation Kit package. The Silicon Labs IDE provides a means of developing code for the C8051F930 and uses the USB Debug Adapter to program the MCU and perform in-system debugging. For users wishing to modify the example code or download the latest version of firmware into the board, the Si1120 Evaluation Kit installation package contains board-specific materials such as the latest version of the pre-built firmware .HEX image and the firmware example source code.

4.1. Using the Si1120EK With the Si1120 Performance Analysis Tool

The Si1120 Evaluation Kit is supported by the Si1120 Performance Analysis Tool. The Performance Analysis Tool allows users to see real-time measured infrared proximity and ambient light measurements from the Si1120 in a graphical form, as well as the calculated values for distance from each of the infrared LEDs and the X, Y, and Z positions. Additionally, recognized gestures and the ambient light conditions can be displayed in dedicated group windows. The communications interface to the Si1120 EVB is provided over USB (P3) via the CP2103 USB-to-

UART bridge.

To use the Performance Analysis Tool with the Si1120 Evaluation Kit:

1. Connect the C8051F930-TB to the PC using a USB cable.

2. Launch the Performance Analysis Tool from the “Start” menu.

3. Select the board from the “Devices” menu (it will normally show up as the last COM port in the list).

4. Select the channels you wish to display on the picture of the Si1120 EVB that appears. The individual channels

available are described in “4.1.1. Channel Selection” .

5. Click the green “Acquisition” arrow to begin collecting data.

Figure 5 shows an example of the Performance Analysis Tool output when connected to the board. To generate the

graph, a hand was moved above the Si1120EVB. The selected traces shown are the calculated X and Y positions.

The green trace represents the X position, while the yellow trace represents the Y position of the hand above the board.

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Figure 5. Performance Analysis Tool Main Window

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4.1.1. Channel Selection

Selecting which channels to display is a simple matter of checking the appropriate boxes over the board

photograph, shown in Figure 7.

4.1.2. Gestures and Ambient Light Conditions

In addition to infrared and ambient light measurements and distance calculations, the example firmware contains algorithms for gesture recognition and ambient light condition detection. When connected to the board with the

Performance Analysis Tool, two group windows will appear, as shown in Figure 6. When a gesture is recognized by

firmware, the gesture name and parameter information will be added to the top of the 3D Gesture group. Four

gestures are supported by the example code. The parameters for each gesture are listed in Table 1. The detected

ambient light conditions (Sunlight, Incandescent/Halogen, or Fluorescent/CFL) will be displayed in the Light Type.

Figure 6. Performance Analysis Tool Group Windows

Gesture Name

Swipe Left

Swipe Right

Swipe Up

Swipe Down

Parameter

Speed

Speed

Speed

Speed

Table 1. Recognized Gestures

Parameter Range Description of Action

1 18 (Slow to Fast) Move hand rapidly from the right side to the left side of the board.

1 18 (Slow to Fast) Move hand rapidly from the left side to the right side of the board.

1 18 (Slow to Fast) Move hand rapidly from the bottom to the top of the board.

1 18 (Slow to Fast) Move hand rapidly from the top to the bottom of the board.

4.2. Silicon Laboratories IDE

The Silicon Laboratories IDE integrates a source-code editor, a source-level debugger, and an in-system Flash programmer. This tool can be used to develop and debug code for the C8051F930 MCU. The use of several thirdparty compilers and assemblers is supported by the IDE.

4.2.1. IDE System Requirements

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The Silicon Laboratories IDE requirements:

Pentium-class host PC running Microsoft Windows 2000 or newer.

One available USB port.

4.2.2. Third Party Toolsets

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The Silicon Laboratories IDE has native support for many 8051 compilers. The full list of natively supported tools is as follows:

Keil

IAR

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Raisonance

Tasking

SDCC

4.2.3. Downloading the Example Firmware Image

Example firmware source code as well as a pre-built .HEX image are available from the Si1120-EK web page at http://www.silabs.com/products/sensors/infraredsensors/Pages/si1120ek.aspx

. The prebuilt .HEX image can be downloaded directly into the C8051F930 target board. The firmware source code and an example IDE project are configured to use a default path of C:\SiLabs\Optical_Sensors/Si1120/Firmware. Follow the steps below to update or refresh the .HEX image in the C8051F930-TB:

1. Connect the hardware as described in "3.2. Hardware Setup" on page 2.

2. Launch the Silicon Labs IDE, and click on Options->Connection Options.

3. Select “USB Debug Adapter” and then select the connected adapter from the list (it should show up as “EC3” followed by a serial number).

4. Select “C2” as the debug interface, and press “OK”.

5. Connect to the board by pressing the “Connect” icon, or using the keyboard shortcut Alt+C.

6. Click on the “Download” icon, or use the keyboard shortcut Alt+D.

7. In the download dialog window, click “Browse”.

8. Change to Files of Type “Intel Hex (*.hex)” and then browse to select the file.

9. Click “Open” then “Download”.

10.To run the new image, either press “Run” or “Disconnect” in the IDE.

Figure 7. Channel Selection

There are three different types of measurements available from the example firmware:

1. Raw infrared proximity and ambient light measurements. The infrared channels are indicated by the check boxes near the infrared emitters (D1-D7), while the ambient light channel is the check box over the Si1120 (U1).

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Si1120-EK

The data for these channels represents a measurement of the duration of the Si1120’s PRX low time, as seen by the C8051F930 MCU. The Y axis indicates the number of 6.125 MHz clock cycles that occurred while PRX was low. The maximum output limit of the Si1120 is 2 ms, which would correspond to 12250 counts of a

6.125 MHz clock.

2. Linearized distance measurements for each IR channel. The raw proximity values output from the Si1120 will be exponentially larger the closer an object is to the sensor. The channels labeled “Radius 1”, “Radius 2” and

“Radius 3” are linearizations of the raw data output from the sensor when illuminating the three different selected emitters. To use the example effectively, the shorting blocks on header J1 should be set according to

the diagram in Figure 1. This will select D1, D4, and D7 as the three reference emitters.

3. Calculated coordinate measurements. The linearized IR proximity measurements are used to calculate X (leftto-right), y (up-to-down) and a Z (far-to-near) measurements.

Due to the nature of infrared proximity measurements, the object’s size and reflectivity will have an impact on the values measured.

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5. Schematic

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Revision 0.2 to Revision 0.3

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Replaced QuickSense Studio references and instructions with Optical Sensors Programmer’s

Toolkit.

Updated instructions for downloading and using

Si1120-EK example code.

Si1120-EK

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Disclaimer

Silicon Laboratories 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 Laboratories 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 Laboratories reserves the right to make changes without further notice and limitation to product information, specifications, and descriptions herein, and does not give warranties as to the accuracy or completeness of the included information. Silicon Laboratories shall have no liability for the consequences of use of the information supplied herein. This document does not imply or express copyright licenses granted hereunder to design or fabricate any integrated circuits. The products are not designed or authorized to be used within any Life Support System without the specific written consent of Silicon Laboratories. A "Life Support System" is any product or system intended to support or sustain life and/or health, which, if it fails, can be reasonably expected to result in significant personal injury or death. Silicon Laboratories products are not designed or authorized for military applications. Silicon Laboratories products shall under no circumstances be used in weapons of mass destruction including (but not limited to) nuclear, biological or chemical weapons, or missiles capable of delivering such weapons.

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