J-F2,000X-DK Navman Wireless, J-F2,000X-DK Datasheet - Page 12

• 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
5.2 Data input output specifications
All communications between the J-F2 receiver and external devices are through the I/O surface mount pads. These provide the
contacts for power, ground, serial I/O and control. Power requirements are discussed in Section 5.1.
5.1.7 Flash upgradability
The firmware programmed in the Flash memory may be upgraded via the serial port TX/RX pads. The user can
control this by driving the Serial BOOT select line high at startup, then downloading the code from a PC with
suitable software (SiRFFlash). In normal operation this pad should be left floating for minimal current drain. It
is recommended that in the user’s application, the BOOT select pad is connected to a test pad for use in future
software upgrades. Refer to the Designer’s Notes for additional information.
5.1.8 Reset input
This active low input to NSRESET. No user POR is required. It is recommended to not use or connect to this pin,
except as indicated by NAVMAN.
The module contains a POR that monitors the 1.8V supply. This POR has strict criteria to ensure system software
reliability. If this signal is triggered by low voltage on the 1.8V supply the J-F2 will drop into Hibernate mode and the
patch RAM and CGEE will be cleared. The J-F2 will require an ON pulse once the supply has stabilized to wake up
the GPS receiver and return to a full power state (CGEE must be reloaded). If the supply voltage drops low enough
for a long enough period of time the RAM/BBRAM will be cleared and the GPS will carry out a Cold start once
woken up.
Note: If the voltage drops low enough to affect the RAM/BBRAM/PATCH RAM and the 1.8V POR has triggered,
all power must be removed from the module for a minimum of 10 seconds to ensure the memory is cleared of all
corrupted data. It is strongly recommend a 1.8V back up supply is used to ensure this does not happen. The 1.8V
back up supply (14uA typical) will take over once the GPS has been shut down into Hibernate mode via the 1.8V rail
POR as the main 1.8V supply inadvertently drops. Enough isolation is required on the main 1.8V supply to prevent
current draining back through the main 1.8V supply and cause memory corruption. Review the Designer’s Note for
more details.
It is important that the always ON 1.8V is primary design consideration and must be maintained as much as possible.
Review the Designer’s Note for in depth information on the 1.8V supply requirements.
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Datasheet
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