Si114x-MFB Si114X MULTI-FUNCTION KIT USERS GUIDE 1. Kit Contents The Si114x Multi-Function Kit contains the following items: Si114x Multi-Function Board Si114x-MFB Quick Start Guide 2 USB Cables 2. Introduction The Si114x-MFB is intended as an evaluation and development platform for the Si1141, Si1142, and Si1143 infrared proximity and ambient light sensors. The board has two sides which are separate systems that only share communications and debug connections to the PC. The active side is chosen using the hardware switch S1, shown in Figure 1. When the switch is in the upward position, the Top-Side is the active side while the Bottom-Side is active when S1 is in the downward position. As shown on the left side of Figure 1, the main components of the top side of the Si114x multi-function board (Si114x-MFB) are the Si1143 sensor (U4), the C8051F931 microcontroller (U1), and the infrared emitters (DS2 through DS4). 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. As shown on the right side of Figure 1, the main components of the bottom side of the Si114x-MFB are the Si1143 sensor (U6), the C8051F931 microcontroller (U5), and the infrared emitter DS5. This emitter is OSRAM part number SFH 4650 and has a power rating of 45 mW and a half-angle of 15 degrees. Other emitters with different characteristics may also be used, depending on the specific application requirements. The default firmware for the top-side of the board is a thumb-scroll implementation that 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 a thumb that is swiped in proximity to the sensor. The firmware is able to detect different gestures using the infrared sensor, as described in Table 1 on page 6. The nine LEDs DS8-DS16 will change state to indicate what gesture was recognized. The Si1143s ambient light sensor (ALS) is also monitored by the firmware. The default firmware is intended to be used in conjunction with the Si114x Performance Analysis Tool to provide user feedback. The default firmware on the bottom-side of the board is a long-range implementation that measures the infrared light energy detected by the Si1143 while a single infrared emitter is activated. All three of the Si1143s LED drivers are connected to the one emitter to allow multiple drivers to activate the emitter at the same time in order to send more current through the emitter than one driver can provide. Driving more current through the emitters can help achieve longer ranges of detection because the infrared LEDs emit more light with more current. The default firmware only uses one driver at the default pulse width to drive the LED. The five LEDs DS17-DS21 will change state to indicate how much infrared light feedback is being measured. The Si1143s ambient light sensor (ALS) is also monitored by the firmware. The default firmware is intended to be used in conjunction with the Si114x Performance Analysis Tool to provide user feedback. Rev. 0.2 7/13 Copyright 2013 by Silicon Laboratories Si114x-MFBSi114x-MFB TOP SIDE BOTTOM SIDE P1 COMM Si114x RANGE DEMO SILICON LABS U1 www.silabs.com CP2103 S1 DS17 DS8 DS9 DS10 DS18 DS11 DS12 DS13 DS19 DS14 DS15 DS16 DS20 DS21 DEBUG U5 P2 U1 U3 F931 F931 F326 U6 DS5 U4 DS4 DS3 DS2 Figure 1. Si1143 Evaluation Board 2 Rev. 0.2 DS1