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Siretta Ltd
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Berkshire RG7 1PW
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35
ZETA Series
GPRS/UMTS/LTE Terminal with GPIO
Table 9.
Main characteristics of GPS
Characteristic
Typical Values
GPS RX Sensitivity
-164dBm
GPS Cold Start Autonomous
-147dBm
GPS Hot Start Autonomous
-161dBm
GPS Tracking Mode
-166dBm
GPS Accuracy
3m
TTFF from Cold Start
42 secs
TTFF from Warm Start
30 secs
TTFF from Hot Start
1.8 secs
GPS Output Power
Min
Nom
Max
Output enabled
2.8V
3.0V
3.3V
Output disabled
-
0.0V
0.2V
Output current
0mA
20mA
28mA
Table 11.
GPS antenna connection output characteristics
NOTE:
Power supply is enabled when GPS engine is powered with the following AT command:
AT$GPSP=1 - will turn the GPS engine on
AT$GPSP=0 - will turn the GPS engine off
To output NMEA data, please refer to AT$GPSNMUN command in the AT command reference guide.
GPS Characteristics
GPS antenna power supply is generated internally by the ZETA modem and
is a stable high accuracy low dropout supply designed to give very good GPS
performance.
Table 10.
GPS power consumption
GPS Power Supply
Characteristic
Typical Values
Power Consumption in Acquisition
46.4mA
Power Consumption in Tracking
37.8 mA
Power Consumption in Low Power Tracking
25.7mA
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