J-F2,000X-DK Navman Wireless, J-F2,000X-DK Datasheet - Page 5

• Manufacturer Part Number: J-F2,000X-DK
• Description: EVAL KIT GPS JUPITER 2
• Manufacturer: Navman Wireless
• Series: -r
• Type: Receiver, GPSr

Specifications of J-F2,000X-DK

• Frequency: 1575.42MHz
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With/related Products: Jupiter 2
• Other names: 943-1013

J-F2
2.3 Major components
All power supply components are on board including capacitors and additional Power-On-Reset (POR) for the 1.8V supply.
A 1.8V always ON supply with noise and ripple characteristics mentioned in section 5.1 is critical for reliable operation. This can
be a 1.8V supply that is backed up by a very low current 1.8V LDO that will supply the 14uA typical when the GPS has been
shut down into Hibernate mode. Refer to the Designer’s Notes for additional details. If the 1.8V supply is inadvertently cut off
the GPS 1.8V POR will shut it down into Hibernate with loss of data. It is important that the GPS has sufficient bulk capacitance
to enable the GPS to shut down gracefully into Hibernate mode. In addition this would only be possible if a 1.8V battery backed
supply is also provided to retain the GPS in Hibernate mode ready to accept an ON pulse once the main 1.8V supply is available
again.
ON-OFF (1.8v - 3.6V). This control signal is used to turn ON and turn OFF the GPS. Main 1.8V power must be already
available and stable. There is a minimum time period before the receiver will accept an ON pulse once the 1.8V power has
been first applied, 3 seconds is a good example. It is suggested the SYSTEM-ON line is monitored as it will indicate when the
GPS can accept an ON pulse after the first 1.8V power application.If a 1.8V battery back-up system is used and the GPS has
already been powered up, shut down should be done via the ON-OFF line. The SYSTEM-ON line will not indicate a READY
state if the main 1.8V supply is re-applied. The battery back-up supply has kept the system ready and valid and an ON pulse
can be applied as soon the main 1.8V supply is stable. Note, clean application of this 1.8V supply is required.
SYSTEM-ON. This is an active high (1.8V) indication that the system is ready to receive an ON pulse or that the system is
ON and running. A short duration active high pulse occurs on this line if the main 1.8V supply has been connected (if no
1.8V battery back up is used) and is valid. Note, that noisy or unstable application of the 1.8V power will cause the 1.8V POR
monitor to shut the GPS down and lose data.
Band pass SAW filter (1.575 GHz): This filters the GPS signal and removes unwanted signals caused by external influences
that would corrupt the operation of the receiver. The filtered signal is fed to the RF input of GSD4e chipset for further
processing. The filter has a bandwidth of 2 MHz.
GSD4e chip: This single chip GPS device includes an integrated Baseband, RF and LNA sections.
LNA (Low Noise Amplifier): This amplifies the GPS signal and provides enough gain for the receiver to use a passive
antenna. A very low noise design is utilised to provide maximum sensitivity. This LNA is internal to the GPS baseband and can
be switched between low and high gain mode.
VDD 18: The primary always ON supply voltage for the module. A very low noise 1.8V always ON source must be used.
NSRESET: This is the user Reset input, however it is recommended not be used. The module has two internal POR devices.
One POR for the 1.2V core and a POR for the 1.8V supply. No user POR is required.
There are Boot jumpers to select I2C/UART/SPI communications on the single HOST port.
1 x UART: This is the primary serial communications port for NMEA or SiRF OSP protocols.
1 x HOST SPI: The main UART also functions as a SPI interface. Hardware selectable.
1 X HOST I2C: The main UART also functions as an I2C interface. Hardware selectable.
DR_I2C: This port is used for MEMS sensors and serial EEPROM is also supported on this port.
TCXO (Temperature Compensated Crystal Oscillator 0.5ppm): This highly stable 16.369 MHz oscillator controls the
down conversion process for the RF block.
FLASH – 16MB storage of operational software.
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Datasheet
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