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SiRFstar III performance in the GPS25 foot print
The Orcam GPS35 is a compact, low cost, low power OEM GPS receiver based on the much acclaimed SiRF Star III architecture, in our GPS2x foot print. With a tracking sensitivity of -159 dBm, the GPS35 will continue tracking in the most demanding environments making indoor navigation possible and meeting the challenges of urban canyons and multi path environments. SiRF SnapLock™, FoliageLock™ and SingleSat™ further improves performance and provides additional fixes in difficult environments. Links to pdf documents - GPS35 Data Sheet & Integration Guide
Power Supply Designed to operate from 3.3 - 5.5 V DC supply, GPS35 has all necessary power regulation and -management functions on board providing unparalleled SiRF Star 3 acquisition and navigation performance with a power consumption of ~100 mW during tracking, making it ideal for a variety of embedded applications. Separate input for Back-up battery To prevent loss of time, GPS data and user settings when Vcc is removed, a separate back-up battery can be connected to VBAT to ensure the Real-time clock and the user RAM remains powered when Vcc is removed. Current consumption from the battery when Vcc is removed is a mere 10 µA.
Converting from GPS25 Having the same footprint as our GPS25 receiver, the GPS35 is a drop in replacement for GPS25 in applications not using the GPS25 PWR line (pin 8) for hardware control of the hibernate mode.Pin 11, which on GPS25 is a ground connection, on GPS35 is a GPIO line not used by the default firmware, and therefore can be left connected to ground. For applications using the GPS25 PWR line to control the Hibernate mode, the logic driving the PWR line will have to be redesigned to provide a pulse instead of a level shift.
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