SI1146 Datasheet, PDF (1/7 Pages) Silicon Laboratories – UVIRSLIDER2EK DEMO KIT USERS GUIDE

Si1146 UVIRSlider2EK
Demo Kit
Si1146 UVIRSLIDER2EK DEMO KIT USER’S GUIDE
1. Kit Contents
The Si1146 UVIRSlider2EK Demo Kit contains the following items:
Si1146 UVIRSlider2EK Demo Board
Si1146 UVIRSlider2EK Demo Board Quick Start Guide
USB Cable
2. Introduction
The Si1146 UVIRSlider2EK Demo Board implements a UV Index sensing function based around the Si1146 UV,
infrared proximity, and ambient light sensor. As shown in Figure 1, the main components of the board are the
Si1146 sensor (U2), the C8051F800 microcontroller (U1), and two infrared emitters (DS1 and DS2). Hardware is
also provided on-board to facilitate code development for the C8051F800 and communications with software
support packages over a USB interface.
The firmware running on the C8051F800 measures the UV Index of the environment of the Si1146 sensor and
indicates the UV Index detected by illuminating blue LEDs on the board.
The board is also capable of running a touchless slider algorithm using infrared light energy detected by the
Si1146, while each of the two infrared emitters are independently activated. The infrared light from these emitters
will be reflected back to the Si1146 by any object that is placed in proximity to the board. The left-right position is
then calculated from these two measurements and used to illuminate the appropriate signal LED. If no object is
close enough to the board, the measured signal levels will fall below pre-determined thresholds, and no signal
LEDs will be illuminated. In addition to indicating the current position, the algorithm is also able to detect different
gestures from the infrared sensor, as described in Table 2 on page 3. The Si1146’s ambient light sensor (ALS) is
also monitored by the software, which can determine the amount of ambient light present.
On this board, the infrared emitters used are OSRAM part number SFH 4056. These emitters have a power rating
of 40 mW and a half-angle of 22 degrees. Other emitters with different characteristics may also be used,
depending on the specific application requirements.
Note: The touchless infrared position and gesture detection implemented in the example is patent pending.
UVIRSLIDER2EK
DS1
U2
SILICON LABS
www.silabs.com
DS2
DS10
+5V_IN
U1
U3
P1
F800
F326
Figure 1. Si1146 Slider Demo Board
Rev. 0.1 1/14
Copyright © 2014 by Silicon Laboratories
Si1146 Slider Demo Kit