REFERENCE MANUAL - FTP Directory Listing - Trimble

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, KEMET
C0402C180J5GAC
C0G
C2
0.1 uF, 0402 capacitor, CAL-CHIP
GMC04X7R104K16NTLF
X7R
J1 MCX Connector Johnson Components 133-3711-312
L1
100 nH, 0603 inductor, Coil Craft
0603CS - R10XJLU
surface mount
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
Copernicus GPS Receiver 65