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USB GPS X2

Page history last edited by MrTundraMan 11 years, 3 months ago

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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