Silicon Laboratories Si1102EK User Manual

S i 11 0 2 E
VALUATION

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 Si1102's 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 Si1102's pins.
Figure 1 shows the Si1102EK board. Table 1 lists the signals connected to each of header H1's pins.
For more information regarding Si1102 functionality, please see the Si1102 data sheet.
D2 – proximity
indicator LED
R1 (bottom side of
board) – Potentiometer
controls the proximity
threshold
Rev. 0.1 10/09
K
I T
S1 – battery
power switch
Figure 1. Si1102 Evaluation Kit Board
Table 1. Header H1 Pin-Out
H1 Pin # Si1102 Pin #
1 2
2 6
3 5
4 1
5 N/C
6 3
7 7
Copyright © 2009 by Silicon Laboratories
U ' G
SER S UIDE
D1 – infrared LED
Si1102
Signal Name
Ground
SREN
VDD
PRX
N/C
TXO
FR
S i 11 0 2 - E K
R2 (bottom side of
board) – Potentiometer
controls Si1102 infrared
LED strobe frequency
Si1102-EK