NavSpark PX1172RDP-20 User manual

Getting Started with
PX1172RDP-20 Evaluation Board

Top View of RTK/DR EVB
USB 1 Not Used
Not UsedRF Input

Install USB Driver from Silicon Lab Site
https://www.silabs.com/developers/usb-to-uart-bridge-vcp-drivers
After connecting USB cable to
USB1 port, user should see a
COM port appear on Device
Manager.

Get Windows GNSS Viewer
•https://navspark.mybigcommerce.com/content/GNSS_Viewer-
CustomerRelease.zip
•http://navspark.mybigcommerce.com/content/GNSSViewerUserGuide.pdf

Interface of RTK/DR EVB (1/3)

Interface of RTK/DR EVB (2/3)
NAME DESCRIPTION
USB_1
USB
port for NMEA out, RTK correction & binary command in, 115200
USB_2
USB port for updating firmware to R
-chip,
jumper A/B must be shorted
and C/D
must be open, 115200
RTK_STAT_B
Status signal
Low : RTK Fix for Heading
Blink : RTK Float for Heading
High : otherwise
RTK_STAT_R
Reserved
RESET_N
Reset signal from external device, active low
TXD_B
Data
output from B-chip’s UART1
RXD_B
Data
input to B-chip’s UART1. Use only when USB_1 is not used, or
there
will
be drive contention.
SAFEBOOT_N
Leave
unconnected for normal use. Pull-low for loading firmware
into
empty
or corrupted flash memory from ROM mode

Interface of RTK/DR EVB (3/3)
NAME DESCRIPTION
SW1
Push button for manual reset to the module
TIMEPULSE
One
-pulse-per-second (1PPS) time mark output, 3.3V LV-TTL. The
rising
edge
synchronized to UTC second when getting 3D position fix.The
pulse
duration
is about 100msec at rate of 1Hz.
Jumper G/H, E/F
Jumper G/H, E/F must be short for normal use.
VCC33
3
.3V power output for external device when USB_1 connects to
laptop,
or
3.3V power input for EVB when USB_1 is not used
RF_IN1
RF
input #1
RTK
Position: RF_IN1 antenna position
DIR
Forward or reverse direction input from vehicle.
Reverse (HIGH > 2.0V), Forward (LOW < 0.8V), max input 36V
SPD
Car
speed pulse input, frequency < 4kHz.
LOW
< 0.8V, HIGH > 2.0V, max input 36V.

EVB Usage (1/3)
USB 1
RF_IN1 Not Used
1. Connect RTK antennas to RF_IN1
2. Connect wheel-tick signal to SPD (optional*)
3. Connect direction signal to DIR (optional*)
4. Connect ground return for SPD/DIR
5. Run GNSS Viewer on Windows laptop
6. Connect USB cable to USB1 and Windows laptop
7. Connect GNSS Viewer to EVB at 115200 baud rate
*: Connect vehicle wheel-tick signal for best dead-
reckoning performance.
Not Used
SPD
DIR
GND

EVB Usage (2/3)
Configure NTRIP Connection Setting

Result on GNSS Viewer
After NTRIP Client getting RTK correction data and EVB
receiving signal testing outdoors under open sky, the
receiver will go from 3D Fix to RTK Float to RTK Fix state.

Automotive Dead-Reckoning Usage
•The PX1172RDP-20 EVB should be placed in a
fixed orientation relative to the vehicle
•Connect vehicle wheel-tick signal to SPD
header pin
•Connect vehicle forward/reverse signal to DIR
header pin (optional)
•Connect USB1 to laptop to perform evaluation
using GNSS Viewer

Odometer-less Dead-Reckoning Usage
•The PX1172RDP-20 EVB should be placed in a
fixed orientation relative to the vehicle
•Connect USB1 to laptop to perform evaluation
using GNSS Viewer

Firmware Update (1/2)
To update firmware to PX1172RD EVB:
•1. Unzip the firmware file
•2. Connect EVB USB1 to a Windows PC running GNSS Viewer.
Connect GNSS Viewer to the EVB.
•3. Select the unzipped .bin file with “Master” in filename using the
small button on right of the Download button.
•4. Click the Download button, first boot-loader will be downloaded,
and then main firmware will be downloaded. After downloading is
done, the pop-up window will close and module will reboot.

Firmware Update (2/2)
•5. Connect EVB USB2 to a Windows PC running GNSS Viewer using
a 2nd USB cable. Connect GNSS Viewer to the EVB.
•6. Select the unzipped .bin file with “Slave” in filename using the
small button on right of the Download button.
•7. Click the Download button, first boot-loader will be downloaded,
and then main firmware will be downloaded. After downloading is
done, the pop-up window will close and module will reboot.

EVB Schematic 1/3
PX1172RDP

EVB Schematic 2/3

EVB Schematic 3/3