User's Guide

HE863 Family Hardware User Guide
1vv0300891 Rev.5
- 2011-03-18
Reproduction forbidden without Telit Communications S.p.A’s. written authorization - All Rights
Reserved. Page 86 of 89
16. Antenna detection design guide
The following assumes that the application is using a commonly found 10K
DC terminated antenna.
The figure below outlines the reference implementation, please keep in
mind that these components are in the RF path and care must be taken when
implementing this circuit.
The Vaux is a 1.8V regulated power source output from the module.
ADC is a 0 ~ 1200mV 10-bit Analog to Digital Converter input.
The software assumes the use of the ADC1 input and GPIO13 port of the
module for this purpose.
For the detailed operation of this function, please find AT#GSMAD command
in the HE863 AT Command Manual.
Component Value
R1
68K
R2
15K
R3
68K
R4
68K
L1
47nH
C1
33pF