Operating Modes - Rikaline GPS-22 User Manual

1) All I/Os on the Data Interface are related to VCC (3 to 3.6 Volts) and GND levels.
2) ON/OFF: control the GPS engine "ON" or "OFF". If this pin is pulled "HIGH" whenever a reset
condition occurs or if it is turned "HIGH" during operating, the GPS engine is turned "ON". If this pin is
pulled "LOW" whenever a reset condition occurs, the GPS engine is not started. If this pin is turned
"LOW" when in operating, the GPS engine is turned "OFF". When ON/OFF is "LOW", the on/off state can
be superseded with the PXEMaRT manufacturer specific NMEA sentence on RXA, as defined below.
3) RXA and TXA: The Serial NMEA data port (RXA and TXA) is an asynchronous serial port (UART).
4) USPED: USPED "HIGH": 9600 Baud rate, 8 bit data, no parity check, 1 stop bit and no flow control.
USPED "LOW": 4800 Baud rate, 8 bit data, no parity check, 1 stop bit and no flow control .
This setting can be modified with the PXEMaPT manufacturer specific NMEA sentence defined later.
5) PPS: This is Pulse Per Second highly accurate timing signal generated by the on-board GPS base
band processor at 83ms duration. After a reset condition, the default setting for this port is inactive. This
setting can be modified with the PXEMaPS manufacturer specific NMEA sentence defined below.
6) RESETN: The receiver has 2 reset conditions: first, on power-on, thanks to an on-board Power On Reset
circuitry; and second an external reset when the RESETN pin is "LOW".
7) VCC: Main power supply.
8) VRTCBK: This is the back-up supply for the on-board real time clock.
9) ALMRDY: When in active mode, this indicates the on-board almanac status. Upon start up and
whenever the almanac data are tested invalid or not up-to-date, the output level is "low". If tested valid or
up-to-date, the output level is "high"
10) STANDBYIN: This input sets the receiver in stand-by mode when its level is "low". Otherwise, the
receiver is either in active or power save mode. See below under operating modes for details.

3.3 Operating Modes

Mode Description
Active Receiver is running, doing
Mode acquisition, tracking, position fixes
Power GPS receiver functions are turned
Save OFF, MCU in idle mode, MCU clock
Mode is running, RTC is running
Stand- GPS receiver functions are turned
by OFF, MCU clock is stopped, RTC is
Mode running on the Back-up supply
Power GPS receiver functions are turned
Down OFF, MCU clock is stopped, RTC is
Mode running on the Back-up supply
Rikaline International Corp.
Tel: ++886 2 8973-1899 Fax: ++886 2 8973-1896 E-Mail: info@rikaline.com.tw web: www.rikaline.com.tw
GPS-22 Operating Manual
VCC pin
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Specifications subject to change without prior notice
14F
, 171, ChengGong Rd., Sanchong City, Taipei 241, Taiwan, R. O.C
On\Off Pin Standby
pin
High High
Low (or thru High
NMEA
command)
low low
low low
Rikaline
Current
cons. Type.
17mA
2.2mA
300μA
1μA