NavSpark PX1175RD Manual page 6

17
TXD_R
18,19
NC
20
RTK_STAT_B
21
NC
22
ODOMETER
23
DIRECTION
24,25
NC
26
RXD2_B
27
TXD2_B
28,29,30,31
NC
32
GND
33,34
VDD33
35
NC
36
V_BCKP
37
GND
38,39,40
NC
41
GND
42
TXD_B
43
RXD_B
44
SDA
45
SCL
UART serial data input, 3.3V LVTTL.
UART port for firmware updating of R-chip. Default baud rate 115200.
No connection, empty pin
Status signal
0 : RTK Fix for Positioning
Blink : RTK Float for Positioning
1 : otherwise
No connection, empty pin
Vehicle odometer wheel-tick speed pulse input, frequency < 4kHz.
Optional forward (LOW) or reverse direction (HIGH) input from vehicle.
No connection, empty pin
UART serial data input, 3.3V LVTTL.
One simplex asynchronous serial UART port is implemented. This UART input is
normally for sending RTCM-SC104 correction data or base station SkyTraq raw
measurement data to the receiver at 115200 default baud rate. In the idle
condition, this pin should be driven HIGH. If the driving circuitry is powered
independently of PX1175RD, ensure that this pin is not driven to HIGH when
PX1175RD is put to sleep, or a 10K-ohm series resistor can be added to
minimize leakage current.
UART serial data output, 3.3V LVTTL.
Not used.
No connection, empty pin
Ground
Power supply, 3.3V DC
No connection, empty pin
Backup supply voltage for internal RTC and backup SRAM, 1.3V ~ 3.6V. V_BCKP
must be applied whenever VCC is applied. This pin should be powered
continuously to minimize the startup time and for keeping DR calibration data.
If VCC and V_BCKP are both removed, the receiver will be in factory default
mode upon power up, all user configuration and calibrated DR parameters are
lost.
Ground
No connection, empty pin
Ground
UART serial data output, 3.3V LVTTL.
One full-duplex asynchronous serial UART port is implemented. This UART
output is normally used for sending position, time and velocity information
from the receiver in NMEA-0183 format at 115200 default baud rate. When
idle, this pin output HIGH.
UART serial data input, 3.3V LVTTL.
One full-duplex asynchronous serial UART port is implemented. This UART input
is normally for sending commands or information to the receiver in SkyTraq
binary protocol at 115200 default baud rate. In the idle condition, this pin
should be driven HIGH. If the driving circuitry is powered independently of
PX1175RD, ensure that this pin is not driven to HIGH when PX1175RD is put to
sleep, or a 10K-ohm series resistor can be added to minimize leakage current.
RTCM-SC104 correction data or base station SkyTraq raw measurement data
can also be sent to this UART input.
Not used, leave unconnected
Not used, leave unconnected
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