Specifications

Model E8 Series Operation Manual
E8 Series A5 Manual 9 October 2008
Page 10 of 12
Appendix A
Board set up
Links
SP1 Leave open circuit, Used to upload new firmware to the CW25 GPS module.
SP2 Leave open circuit for 3.3V antenna power. Link (default) for 5V antenna power.
SP3 Link only when external clock version of the CW25 is used.
SP4 Leave open circuit when U5 (enhanced voltage reference) is used. Link when U5 is not fitted to
board.
JP1 & JP3 fit both jumpers with shorting links for normal operation. Links must be removed when
programming U3 from the Microchip ICD-2 programmer. U3 should be powered from the
programmer when programming. This is necessary as U3 cannot be programmed with 3.3V Vdd.
U5 May be omitted when TCXO reference is used.
U16 MUST be omitted when internal clock version of the CW25 is used. It must be fitted when the
external clock version of the CW25 is used.