Silicon Laboratories Si1102EK User Manual

Si1102-EK

D2 – proximity

indicator LED

D1 – infrared LED

Si1102

S1 – battery

power switch

R1 (bottom side of

board) – Potentiometer

controls the proximity

threshold

R2 (bottom side of

board) – Potentiometer

controls Si1102 infrared

LED strobe frequency

Si1102 EVALUATION KIT USER ’S 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 Si1102’s PRX output pin latches low, which turns on the blue LED labeled D2. The board is pow­ered 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.

H1 Pin # Si1102 Pin # Signal Name

Rev. 0.1 10/09 Copyright © 2009 by Silicon Laboratories Si1102-EK

1 2 Ground
26 SREN
35 VDD
41 PRX
5N/C N/C
63 TXO
77 FR

Figure 1. Si1102 Evaluation Kit Board

Table 1. Header H1 Pin-Out

Si1102-EK

3. Schematics

2 Rev. 0.1

Figure 2. S i1102EK schematic

NOTES:

Si1102-EK

Rev. 0.1 3

Si1102-EK

The information in this document is believed to be accurate in all respects at the time of publication but is subject to change without notice.
Silicon Laboratories assumes no responsibility for errors and omissions, and disclaims responsibility for any consequences resulting from
the use of information included herein. Additionally, Silicon Laboratories assumes no responsibility for the functioning of undescribed features
or parameters. Silicon Laboratories reserves the right to make changes without further notice. Silicon Laboratories makes no warranty, rep­resentation or guarantee regarding the suitability of its products for any particular purpose, nor does Silicon Laboratories assume any liability
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support or sustain life, or for any other application in which the failure of the Silicon Laboratories product could create a situation where per­sonal injury or death may occur. Should Buyer purchase or use Silicon Laboratories products for any such unintended or unauthorized ap­plication, Buyer shall indemnify and hold Silicon Laboratories harmless against all claims and damages.

CONTACT INFORMATION

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Austin, TX 78701
Tel: 1+[phone]
Fax: 1+[phone]
Toll Free: 1+[phone]

Please visit the Silicon Labs Technical Support web page:

https://www.silabs.com/support/pages/contacttechnicalsupport.aspx

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4 Rev. 0.1