User`s manual

PRELIMINARY
V0.5 – Feb-11 User’s Manual Page 17 of 22
Switch Function
Operation via USB connector
(default settings)
Operation via
terminal block
S1 BOOTSEL OFF OFF (*1)
S2 nRST ON OFF
S3
WAKEUP
ON OFF
S4
TX
ON OFF
S5 RX ON OFF
S6 ON ON OFF
S7 VANT ON OFF
S8 VCC ON OFF
Table 3: Switch settings
*1: The BOOTSEL switch can be set to flash Firmware to the A2100-A GPS
receiver. Switch the BOOTSEL switch to “ON”, press and release the nRST
button. After this push the ON button. The A2100-A is now waiting to receive
new firmware data via UART.
After upgrading the firmware switch the BOOTSEL switch to “OFF” and push
first the nRST and then the ON button again for restarting normal GPS
receiver operation.
Related software tool and documentation: SiRFflash
6.3 ICC Jumper
Figure 16: ICC jumper
As long as the VCC DIP switch is “ON” the ICC jumper is bridged. By putting the VCC
DIP switch to the OFF position the current draw of the A2100-A GPS receiver can be
measured directly by connecting a low resistance measurement device to the ICC
jumper.
The low resistance measurement device should be connected before VCC is
switched off!