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Copernicus GPS Receiver 65
APPLICATION CIRCUITS 5
• Antenna open and short detection and protection is provided. The combination
of the two pins Open (Pin 7) and Short (Pin 8) report the antenna status (see
Table 3.2).
Note – When using two power sources, main and standby, an external diode pair must
be used to OR the Vcc and Vbackup power to ensure that the voltage at the module
VCC pin is always 2.7-3.3 VDC.
Table 5.2 Component Information
Component Description Manufacturer Part Number
C1 18 PF, 0402 capacitor,
C0G
KEMET C0402C180J5GAC
C2 0.1 uF, 0402 capacitor,
X7R
CAL-CHIP GMC04X7R104K16NTLF
J1 MCX Connector Johnson Components 133-3711-312
L1 100 nH, 0603 inductor,
surface mount
Coil Craft 0603CS - R10XJLU
Q2 PNP Transistor Central Semiconductor CMPT404A
(MMBTA70LT1 may be
used if 12 Volt back
voltage tolerance is not
required)
Q3 NPN Transistor Philips MMBT3904
Q4 PNP Transistor Philips MMBT3906
Q5 PNP Transistor Philips MMBT3906
U1 Dual schottky diode Diodes Inc. BAT 54 CT
DI Switching Diode ON Semiconductor MMBD914LTIG