RoyalTek REB-3000 - Manual (Page 15)

RoyalTek RGM-3000/REB-3000
GPS Module Operational Manual)
10
VCC DC Power Input
This is the main power supply for the Engine
board. The power range is from 3.3V±10%,
ripple ≤ 200mV. The maximum current of
RGM-3000 is ≤ 200mA.
GND
GND provides the ground for the Engine
board. Connect all grounds.
VBAT
This is the battery backup supply that
powers the SRAM and RTC when main
power is removed. The input voltage level is
from 2.1V~3.6V. Max current draw is 10 uA
at 3.3volt. Without an external backup
battery or on board battery, engine board will
execute a cold start after every turn on. To
achieve the faster start-up offered by a hot
or warm start, either a backup battery must
be connected or battery installed on board.
TXA
This is the main transmit channel and is
used to output navigation and measurement
data to user written software. The default
setup is NMEA Output, 4800bps, 8 data bits,
no parity, 1 stop bit. The default sentences
are GPGGA, GPGSA, GPRMC once per
second and GPGSV once per 5 seconds.
Please refer to “software interface” for the
detail protocol.
RXA
This is the main receiving channel and is
used to receive software commands to the
Engine board from user written software.
Please refer to “software interface” for the
detail protocol.
RXB
This is used for DGPS differential input .
BOOTSEL
Pull Bootsel pin high & reset , then it will get
to boot mode.
GPIO
This pin can be programmed to input or
output. For more application, please contact
Royaltek’s sales.
Absolute maximum ratings
Parameter Symbol Unit Min. Value Max. Value
Supply voltage VCC V 2.97 3.63
Output current mA 200
Critical design guide and diagram
1. It is recommanded to attach GNDu plate (30*30MM) below RGM3000M module or the antenna
module of RGM-3000E to increase the intensity of reception . Please refers to “Design Layout
Diagram “ .
2. During design of integrated layout, please isolate high frequency noise source (power Switch,data
or address signal lines ) from GPS antenna.
3. Please don’t place metal object above patch antenna.