GPSM001 Datasheet, PDF (6/20 Pages) rfsolutions.ltd – OEM GPS Receiver Module

OEM GPS Receiver Module
GPSM001
OPERATING MODES
The receiver has 4 main operating modes, as summarized in the table below
Mode
Description
VCC pin
Active Mode
Power Save Mode
Stand-by Mode
Receiver is running, doing acquisition,
tracking, position fixes
GPS receiver functions are turned OFF,
MCU in idle mode, MCU clock is
running, RTC is running
GPS receiver functions are turned OFF,
MCU clock is stopped, RTC is running
Powered
Powered
Powered
Power Down Mode GPS receiver functions are turned OFF,
MCU clock is stopped, RTC is running
on the Back-up supply
No power
ON/Off pin
High
STANDBY
N pin
High
Current
cons. max
20 mA
Low (or thru
NMEA
command)
Low (or thru
NMEA
command)
Low
High
Low
Low
3 mA
<500 uA
<20 uA
Active
“LP” NMEA
com
Any valid
NMEA com
ON/OFF
“low”
ON/OFF
“high”
STANDBYN “high”
if ON/OFF was “high”
Power save
STANDBYN “low”
STANDBYN “high”
if ON/OFF was “low”
VCC switched Off
ON/OFF “low”
Stand-by
VCC switched On
ON/OFF “low”
Power down
Figure 1 Switching between operating modes
Notes on TTFF / start-up condition:
• When switching from Power Save or Stand-by to Active mode, the start up condition will be
o Hot start if Almanac is valid, Ephemeris is valid (less than 4 hours old), approximate position is known
and RTC is valid
o Warm start if Almanac is valid, Ephemeris is not valid, approximate position is known and RTC is valid
o Cold start otherwise
• When switching from Power Down to Stand-by then to Active mode, the start up condition will be
o Warm start if the Almanac and approximate position saved in Flash are valid, and RTC is valid
o Cold start otherwise
DS031-2 Jan ‘04
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