SI1102EK Silicon Labs

Si1102-EK Si1102 EVALUATION KIT USERS GUIDE 1. Kit Contents The Si1102 Evaluation Kit contains the following items: Si1102EK evaluation board CR2032 battery 2. Hardware Overview The Si1102EK uses a Silicon Laboratories Si1102 to measure infrared proximity. The Si1102 strobes an infrared LED at a frequency defined by the potentiometer labeled R2. The Si1102 measures the amount of infrared light that reflects onto the Si1102 package. If the reflected light magnitude exceeds a threshold set by the potentiometer labeled R1, the Si1102s PRX output pin latches low, which turns on the blue LED labeled D2. The board is pow- ered by a CR2032 battery, and the supply current can be connected or disconnected from the Si1102 and the LEDs using the switch labeled S1. Header H1 provides access to the Si1102s pins. Figure 1 shows the Si1102EK board. Table 1 lists the signals connected to each of header H1s pins. For more information regarding Si1102 functionality, please see the Si1102 data sheet. D2 proximity indicator LED D1 infrared LED Si1102 S1 battery power switch R1 (bottom side of R2 (bottom side of board) Potentiometer board) Potentiometer controls the proximity controls Si1102 infrared threshold LED strobe frequency Figure 1. Si1102 Evaluation Kit Board Table 1. Header H1 Pin-Out H1 Pin Si1102 Pin Signal Name 1 2 Ground 26 SREN 35 VDD 41 PRX 5N/C N/C 63 TXO 77 FR Rev. 0.1 10/09 Copyright 2009 by Silicon Laboratories Si1102-EK Not Recommended for New DesignsSi1102-EK 3. Schematics 2 Rev. 0.1 Not Recommended for New Designs Figure 2. Si1102EK schematic