Navigation device (receiver)
NAVIA
GNSS - KL 3333
Operation manual 2.0
15
Typical connection of the receiver KL3333
Fig. 7.
Typical receiver
KL3333 circuit with NMEA data transferring
by the UART.
Figure 7 shows a typical circuit of the receiver KL3333
with NMEA data
via UART.
The power supply V
cc
=
2.8...4.2 V
connected to pad 8 (V _ IN).
The circuit is
designated
+3.3V main
on the wiring diagram.
The backup battery voltage in the range of V
bat
=
2.0…4.2 V should be applied to the contact
pad 6 (V_RTC).
The circuit is designated
+ V
bat
RTC
on the wiring diagram.
It is recommended
to maintain a continuous Vbat for the operation of the internal clock and memory module.
An active or passive antenna is connected to pin 11 (IN _ RF). The antenna connector is
designated
J1
on the wiring diagram
.
A conductor connecting the contact 11 and the receiver
antenna should be made as a microstrip line with impedance of 50 Ohms.
Pins 10 and 12
(RF
GND) of the receiver is a high-frequency "ground" circuit concerning pin 11 (in the scheme
conventionally indicated by the symbol "hatched" of the earth). The antenna power is suppied
through the receiver. In the case of an active antenna the main power supply should provide
appropriate load characteristics.
Signal / RST (Pin 9) is to restart (reset) the firmware of the receiver. If the user device does
not use this signal, then the output 9 should not be connected to any circuit.
The output signal is provided as a sequence of NMEA with the serial port UART (pad 2 is
Tx signal, pad 3 is the Rx signal).
NMEA messages are present at this port NMEA messages by
the factory default. These signals are designated in the diagram
UART
Tx
NMEA Out
and
UART
Rx
NMEA In
respectively.
Setting the baud rate of the serial port UART, choice the satellites groups from GLONASS,
GLONASS / GPS or GPS, and other settings are made by the special NMEA-like messages.
The timestamp signal PPS
put into contact
4. This signal can be used for consumer
equipment for the exact binding instrument time to standard UTC time.
This signal is
designated
the output
1PPS Out
in the wiring diagram.
The general GND circuit (pin 1) must be connected to general GND circuit
GND
of the
consumer device that uses the receiver.
GND and RF GND (in the diagram designated "hatched ground") are combined within the
receiver and does not need to have communication with each other outside of the receiver.
