Power Modes - Fibocom GTS-4E-00 Hardware Integration Manual

1. Backup Battery
2. Directly Connect to or by switcher to VCC - Main Power
3. GPIO
In case of a power failure on pin VCC, the real-time clock and backup RAM are supplied through pin
V_BACK.This enables the GTS-4E receiver to recover from a VCC - Main power failure with either a
Hotstart or a Warmstart(depending on the duration of VCC outage) and to maintain the configuration
settings. If no backup battery is connected, the receiver performs a Coldstart at power up.
2.1.2

Power Modes

GTS-4E offer five power modes for user, list as:

Full Power Mode: The module will enter Hibernate state after first power up with factory
configuration settings. TheNavigation mode will start after waking up from Hibernate state in cold
start mode by sending ON_OFF signal interrupt pulse from host. Power consumption will vary
depending on the amount of satellite acquisitions and number of satellites in track. This mode is
also referenced as full on, Full Power or Navigation mode.Navigation is available and any
configuration settings are valid s long as the VDD power supply is active. When the VDD is
powered off, settings are reset to factory configuration and receiver performs a cold start on next
power up.VDD supply is intended to be kept active all the time and navigation activity is suggested
to be controlled to low quiescent Hibernate state via ON_OFF control input.

Deep Sleep Mode:By cut VCC - Main Power off with V_BACK on.

Advanced Power Management (APM): APM allows power savings while ensuring that the quality of
the solution is maintained when signal levels drop. APM does not engage until all necessary
information is received. Host can configure e.g. number of APM cycles(continuous or up to 255),
time between fixes (10... 180 sec), Power duty cycle (5...100%) and max position error. Rest of
the time the receiver stays in Hibernate state. This mode is configurable with SiRF binary protocol
message ID53.

Push-to-Fix Mode (PTF): In this mode the receiver is configured to wake up periodically, typically
every 1800 sec (configurable range 10... 7200 sec), for position update and to collect new
ephemeris data from rising satellites. Rest of the time the receiver stays in Hibernate state. When
position update is needed, the host can wake up the receiver by ON_OFF control input interrupt
(pulse low-high-low >90us after which the receiver performs either Snap or Hot start and a valid fix
is available within 1... 8 seconds typ.This mode is configurable with SiRF binary protocol message
GTS-4E GPS Module Hardware Integration Manual Page 7 of 22