USB GPS Revision X2
Connectors
J1 - USB, Mini-B
J2 - JST connector for Li-Poly battery
J3 - Power Switch
J4 = Reset
J5 - HWB
SJ1 - Input switch for control
Indicators
DS2 - PG = USB Power Good
DS1 = PB2 (Microprocessor output pin)
DS3 = PB1 (Microprocessor output pin)
Revision X2 Improvements over the X1 board
- NTC resistor pads 0603 to match available parts (X1 had 0805 pads)
- Added reset header holes to make firmware development easier
- Moved resistor near JST power connector to make it easier to move JST in
- Move around parts near LiPoly charger to make more room
- Eliminated the connections from the LiPoly charger to the Microprocessor so to eliminate backpowering the charger from the Microprocessor
- Changed the LED associated with the charger from indicating that there is +5V to the PG (power good) output of the charger
- Battery connected directly to the GPS VBATT power connection to keep the GPS in low-power mode when shut off
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