SI1140-DK Datasheet, PDF (1/12 Pages) Silicon Laboratories – DEVELOPMENT KIT USERS GUIDE

Si1140-DK
Si1140 DEVELOPMENT KIT USER’S GUIDE
1. Kit Contents
The Si1140 Development Kit contains the following items:
 Si1143 Evaluation Board
 Si1140DK Quick Start Guide
 1 USB Cable
2. Introduction
The Si1140DK is intended as an evaluation and development platform for the Si1143 infrared proximity and
ambient light sensor. As shown in Figure 1, the main components of the Si1143 Evaluation Board (Si1143_EB) are
the Si1143 sensor (U2), the C8051F800 microcontroller (U1), and the infrared emitters (DS1 through DS9). On this
PCB, 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.
The example firmware for the kit measures the infrared light energy detected by the Si1143 while each of three
infrared emitters are independently activated. The infrared light from these emitters will be reflected back to the
Si1143 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 predetermined
thresholds, and the position calculations will not update. The Si1143’s ambient light sensor (ALS) is also monitored
by the firmware. The example firmware is intended to be used in conjunction with the Si114x 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 2 on page 6.
P1
U3
F326
DS10
+5V_IN
U1
F800
DS11
DS12
DS13
DS1
DS7
SILICON LABS
www.silabs.com
U2
DS4
DS2
DS5
DS3
Si1143-EB
DS6
DS9
DS8
Figure 1. Si1143 Evaluation Board
Rev. 0.3 7/13
Copyright © 2013 by Silicon Laboratories
Si1140-DK