SkyTraq PX1175RDP - Page 6

6
17
TXD_R
UART serial data input, 3.3V LVTTL.
UART port for firmware updating of R-chip. Default baud rate 115200.
18,19
NC
No connection, empty pin
20
RTK_STAT_B
Status signal
0 : RTK Fix for Positioning
Blink : RTK Float for Positioning
1 : otherwise
21
NC
No connection, empty pin
22
ODOMETER
Vehicle odometer wheel-tick speed pulse input, frequency < 4kHz.
23
DIRECTION
Optional forward (LOW) or reverse direction (HIGH) input from vehicle.
24,25
NC
No connection, empty pin
26
RXD2_B
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 PX1175RDP, ensure that this pin is not driven to HIGH when
PX1175RDP is put to sleep, or a 10K-ohm series resistor can be added to
minimize leakage current.
27
TXD2_B
UART serial data output, 3.3V LVTTL.
Not used.
28,29,30,31
NC
No connection, empty pin
32
GND
Ground
33,34
VDD33
Power supply, 3.3V DC
35
NC
No connection, empty pin
36
V_BCKP
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.
37
GND
Ground
38,39,40
NC
No connection, empty pin
41
GND
Ground
42
TXD_B
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.
43
RXD_B
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
PX1175RDP, ensure that this pin is not driven to HIGH when PX1175RDP 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.
44
SDA
Not used, leave unconnected
45
SCL
Not used, leave unconnected