Specifications

Table Of Contents
Cinterion
®
ALAS5V Hardware Interface Description
2.4 Sample Application
67
ALAS5V_HID_v00.030a 2019-03-20
Confidential / Preliminary
Page 62 of 124
2.4.3 Sample Circuit for Antenna Detection
The following figures explain how an RF antenna detection circuit may be implemented for
ALAS5V to be able to detect connected antennas (for basic circuit and diagnostic principles -
including usage of GPIO and ADCx_IN pads - please refer to Section 2.2.4). Figure 26 gives a
general overview, Figure 27 depicts the actual antenna detection layout and shows how ESD
protection, i.e., the RF/DC bridge, will have to be handled.
Properties for the components mentioned in Figure 26 and Figure 27 are given in Table 18 -
parts list.
Figure 26: Antenna detection circuit sample - Overview
BATT+
ADC1_IN
ADC2_IN
BATT+
GND
BATT+ BATT+
ADC2_IN
GPIOx
ADC1_IN
ANT_MAIN
ANT1
Module
Antenna
Detection
Circuit
GPIOx
ANT_GNSS
Main antenna
GNSS Antenna
Separate single GND pin which is
not used for module’s power supply
GNSS antenna pad
MAIN antenna pad
LGA
ADC5_IN
DRX_MIMO antenna pad
ANT_DRX_MIMO
ANT3
ANT2
RX Diversity/MIMO
antenna
ADC5_IN