RXM-GPS-F4-T Linx Technologies, RXM-GPS-F4-T Datasheet - Page 13

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RXM-GPS-F4-T

Manufacturer Part Number
RXM-GPS-F4-T
Description
GPS Modules F4 Series GPS Recvr Module Tape and Reel
Manufacturer
Linx Technologies
Datasheet

Specifications of RXM-GPS-F4-T

Rohs
yes
Frequency Band
1575.42 MHz
Number Of Channels
48
Time To First Fix (cold Start)
32 s
Acquisition Sensitivity
- 159.5 dBm
Horizontal Position Accuracy
3 m
Operating Supply Voltage
1.8 V
Operating Supply Current
56 mA
Interface Type
Serial
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Dimensions
15 mm x 13 mm x 2.2 mm
Minimum Operating Temperature
- 30 C
acquire and track satellites and obtain satellite data. It then powers off the
RF stage and only uses its processor (CPU) to determine a position fi x.
Once the fi x is obtained, the receiver goes into Hibernate mode. After a
user-defi ned period of time, the receiver wakes up to track the satellites for
a user-defi ned period of time, updates its position using the CPU only, and
then resumes standby. The initial acquisition time is variable, depending
on whether it is a cold start or assisted, but a maximum acquisition time is
defi nable. This cycling of power is ideal for battery-powered applications
since it signifi cantly reduces the amount of power consumed by the
receiver while still providing similar performance to the full power mode.
Push-to-Fix mode is for applications that require infrequent position
reporting. The module stays in Hibernate mode until either the ON_OFF
line is triggered or a user-defi ned time period has expired. The Push-to-Fix
Period is set by a serial command and can be between 10 seconds and
two hours. An edge on the ON-OFF line triggers an immediate position fi x.
When the module wakes up it acquires a new position fi x and outputs the
NMEA messages before going back into Hibernate mode.
Hibernate mode is the lowest power setting. The tracking and processor
blocks are powered down, but the RTC is still running and the memory
blocks are still powered, enabling a hot start.
The module switches between these states by toggling the ON_OFF line.
The ON_OFF line must go high for at least 100ms to trigger the change of
state and must remain low for at least 100ms to reset the edge detector.
If the module is in Full Power mode, a pulse on the ON_OFF line initiates an
orderly shutdown into Hibernate mode. If the module is in Hibernate mode,
a pulse transistions the module into Full Power Mode. If the module is in
Push-to-fi x mode a pulse initiates a single push-to-fi x cycle. If the module is
in Adaptive Trickle Power mode, a pulse initiates one Trickle Power cycle.
Figure 7: F4 Series GPS Receiver Power Control
ON_OFF
Module
Power
Full Power
100ms
9
100ms
Hibernate
Full Power

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