User's Manual

4.6.3 Cellular Antenna Open/Short Sense
The phone module provides the antenna diagnostics function by the antenna detection circuit. The
antenna detection circuit can detect three statuses: GOOD, OPEN and SHORTED. The detection circuit
can support the antenna resistance values of 1 kOhm to 20 kOhm. The commands are detailed in the AT
command manual.
DC Voltage 2.60V
Status ADC Voltage HEX
GOOD 1.30V 0x80
OPEN 2.60V 0xFF
SHORTED 0.00V 0x00
DC
Voltage
Detector
Antenna
10KDNI
10K
PAM
LNA
RX
Path
TX
Path
Duplexer
MSM