1. Functional Description
Full self-contained GPS receiver
Fully shielded design
- High Performance GPS Single Chip
GPS DSP with integrated real time clock (RTC) ARM7EJ-S CPU
- Built-in 4Mbit program memory, Low noise amplifier, SAW filter, TCXO, regulators (LDO)
- 66 Acquisition-Channel GPS receiver
- WASS/EGNOS/MSAS/GAGAN Supported
- Selectable update rate up to 10Hz (0.1, 0.2 - 1.0 Sec)
- 2 UART and USB 2.0 output
- 5 GPIOs
- Able to external SPI memory for log data.
GPS receiver in a micro-component package
- Postage stamp type package
- Fully automatic assembly: Reflow solderable
- No RF connector
- Size: 13mm X 16mm X 2.7mm
- Weight: 1.0 grams
2. Block Diagram
1.2 Block Diagram
3. Output Protocols
Data format: WGS-84 NMEA 0183
Activated message: GGA, GSA, GSV, RMC all with checksum enabled
Signal format: Buad rate:115200, Byte:8, Parity:none, stop bit:1
Up-date rate: 1 sec
4. Input Start Commands
MESSAGE |
COMMANDS |
| FACTORY RESET |
$PSRF101,0,0,0,000,0,0,12,8*1C |
| COLD START |
$PSRF101,0,0,0,000,0,0,12,4*10 |
| WARM START |
$PSRF101,0,0,0,000,0,0,12,2*16 |
| HOT START |
$PSRF101,0,0,0,000,0,0,12,1*15 |
Time To First Fix (TTFF)
a) Cold Start 60sec (typical)
In a 'Cold Start' scenario, the receiver has no knowledge of position, time or the satellite constellation.
The receiver starts to search for signals blindly.
Cold start time is the longest startup for this module
b) Warm Start 40sec (typical)
In a 'Warm Start' scenario, due to a backup battery the receiver knows its last poison,
the approximate time and the constellation almanac.
Thanks to this it can quickly acquire satellites and gat a position fix faster then in 'Cold Start' mode.
c) Hot Start < 1sec (typical)
In a 'Hot Start' scenario, the receiver has been powered off for less then 2 hours since the last valid
navigation solution.
The GPS uses its last Ephemeris data to calculate a position fix.
5. Pin Description
| Pin No. |
Name |
Pin Description |
I/O |
Note |
| 11 |
VDD |
Supply Voltage |
I |
3.0V~4.2V |
| 5 |
VDDRTC |
Backup BATTERY for RTC and SRAM backup POWER |
I |
1.5~4.2V |
| 1 |
RFIN |
GPS signal form antenna |
I |
50Ω (1.57542GHz)
DC_OUT: 2.8V |
| 27,31 |
RXA |
Serial Port A |
I |
Leave unconnected if not used. |
| 25,30 |
TXA |
Serial Port A |
O |
Leave unconnected if not used. |
| 18 |
USB+ |
USB POWER |
I |
Leave unconnected if not used.
DC Input : 3.3V |
| 32 |
UDP |
USB DATA PLUSE |
O |
Leave unconnected if not used. |
| 34 |
UDM |
USB DATA MINUS |
O |
Leave unconnected if not used. |
| 16 |
GPIO |
GPIO |
O |
3D LED Indication |
| 20 |
PPS |
PPS/TXB/LED |
O |
Buyer Order option (default :1PPS) |
| 17 |
RXB |
Serial Port B |
I |
Leave unconnected if not used. |
| 13 |
RESET |
RESET |
I/O |
Active LOW input reset.
Active LOW open drain output |
| 7 |
PRG |
Module boots into flash memory program mode if VCC during reset |
I |
Leave unconnected if not used.
Use only factory production |
| 19 |
NC |
No Connection |
|
|
| 21 |
SO |
External SPI memory to SI |
O |
Leave unconnected if not used. |
| 22 |
SI |
External SPI memory to SO |
I |
Leave unconnected if not used. |
| 23 |
CS |
External SPI memory to CS |
O |
Leave unconnected if not used. |
| 26 |
SK |
External SPI memory to SK |
O |
Leave unconnected if not used. |
| 29 |
NC |
No Connection |
|
|
| Other |
GND |
|
|
PIN2,3,4,6,8,9,10,12,14,15,24,28,
33,35,36 |
6. Absolute Maximum Ratings
| Parameter |
Min |
Max |
Unit |
| Power supply voltage(VDD) |
|
4.5 |
V |
| Serial port Input pin voltage |
-0.3 |
3.0 |
V |
| I/O port voltage |
-0.3 |
3.0 |
V |
| I/O port current |
|
±20 |
mA |
| Storage temperature |
-40 |
85 |
°C |
IMPORTANT :
This module is not protected against over voltage, reversed voltage or short current of RFIN port.
7. DC Characteristics( Test Temperature : 25°C VDD = 3.3V)
| Parameter |
Condition |
Min. |
TYP |
Max. |
Unit |
| Operating supply voltage |
VDD |
3.0 |
3.3 |
4.5 |
V |
| Operating supply ripple voltage |
VDD |
|
|
50 |
mV |
| Sustained supply current (ex. : at 3D Fixed) |
VDD=4.2V |
44 |
45 |
47 |
mA |
| VDD=3.8V |
44 |
45 |
47 |
mA |
| VDD=3.6V |
44 |
45 |
47 |
mA |
| VDD=3.3V |
44 |
45 |
47 |
mA |
| Peak supply current (ex. : at GPS START operation) |
VDD=3.3V |
|
47 |
50 |
mA |
| USB+ port power |
USB+ |
3.0 |
3.3 |
3.6 |
V |
| USB section operating current |
USB+=3.3V |
3 |
4 |
5 |
mA |
| VDDRTC Input voltage |
VDDRTC |
1.5 |
3.05 |
4.5 |
V |
| Standby "VDDRTC" Backup current |
VDDRTC=3.0V |
5.0 |
6.5 |
15 |
uA |
| I/O INPUT level |
High |
|
1.96 |
|
3.0 |
V |
| Low |
|
-0.2 |
|
0.6 |
V |
| I/O OUTPUT level |
High |
Ioh=2mA |
2.4 |
|
2.8 |
V |
| Low |
Iol=2mA |
0.1 |
|
0.4 |
V |
| "RFIN" DC output Voltage |
20mA |
2.6 |
|
2.8 |
V |
Private output DC Current
("RFIN" + "GPIO" output) |
VDD=4.2V |
|
|
30 |
mA |
| VDD=3.3V |
|
|
40 |
mA |
| Operating temperature |
VDD=3.3V |
-40 |
25 |
+80 |
°C |
8. AC Characteristics
( Test Temperature : 25°C VCC = 3.3V RF Input : Conducted )
| Parameter |
Condition |
Min |
Typical |
Max |
Unit |
| RF_IN Input level |
|
|
|
-40 |
dBm |
| RF_IN Input Impedance |
Fo=1575.42MHz |
|
50 |
|
Ω |
| Tracking Sensitivity (C/N) |
3D (C/N avg. 15dB-Hz) |
|
-164 |
|
dBm |
| Re-Tracking Sensitivity (C/N) |
3D (C/N avg. 18dB-Hz) |
|
-155 |
|
dBm |
| Cold start Sensitivity (C/N) |
3D (SV 9EA in view) |
|
-148 |
|
dBm |
| Cold start time(TTFF) |
-130 dBm(2D) (SV 9EA) |
|
50 |
|
sec |
| Hot start time |
-130 dBm(2D) (SV 9EA) |
|
1 |
|
sec |
| Re-acquisition time (5 sec) |
-130 dBm(3D) (SV 9EA) |
|
3 |
|
sec |
| Re-acquisition time (60 sec) |
-130 dBm(3D) (SV 9EA) |
|
3 |
|
sec |
| Position error (Latitude, Longitude) |
-130 dBm(SV 9EA in View) |
|
10 |
|
m |
| Position error (Elevation) |
-130 dBm(SV 9EA in View) |
|
50 |
|
m |
| Operational Limits |
Altitude |
|
|
18 |
Km |
| Velocity |
|
|
1,800 |
Km/h |
9. Active Antenna Selection Guide Recommend
| Parameter |
Condition |
| Frequency |
1575.42MHz |
| Polarization |
RHCP |
| V.S.W.R |
Less than 2.0 |
| Impedance |
50Ω |
| LNA Gain |
24dB±2dB |
| Noise Figure |
1.5dB(Max) |
| Band Attenuation |
20dB(Min) @FO±50MHz |
| Voltage |
DC 2.7V(±10%) |
| Current |
20mA(Max) |
|
