Table 18. Rx2 Antenna Adc Characteristics; Table 19. Rx2 Antenna Diagnostics Ranges - Sierra Wireless AirPrime AR7558 Hardware Integration Manual

Hardware Integration Guide
The AirPrime AR7558 FW accepts two limits which are used to evaluate the status of the antenna,
representing the short and open thresholds. Refer to document [7] for the syntax of AT+ANTLIMT.
Table 18. RX2 Antenna ADC Characteristics
ADC Voltage Range
Resolution
ADC Values
Voltage/ADC step
1 Assumes 10kΩ Nominal DC resistance in the attached antenna and internal to AirPrime AR7558 device
The following example illustrates the Antenna states and resistance values for a typical limit setting.
AT+ANTLIMT=2,839,1088
Table 19. RX2 Antenna Diagnostics Ranges
Antenna State
Short
Normal
Open
Note: Highlighted numbers in the table above are programmed as shortLim and openLim using the
+ANTLIMT command.
4116922
Min Nom
0 0.9
-
0
~0.0011
Min ADC Max ADC
0 839
841 1086
1088 1900
Rev 1.1
Max Units
1.8 Volts
15 Bit
16383
Volts
Antenna Resistance Range
~ ≤ 7 kΩ
7 kΩ < x < 13 kΩ
≥ 13 kΩ
January 21, 2015
RF Specification
23