Trimble Outdoors 58052-00 Benutzerhandbuch
Copernicus GPS Receiver 6 5
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
of the two pins Open (Pin 7) and Short (Pin 8) report the antenna status (see
).
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.
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
C0G
KEMET
C0402C180J5GAC
C2
0.1 uF, 0402 capacitor,
X7R
X7R
CAL-CHIP
GMC04X7R104K16NTLF
J1
MCX Connector
Johnson Components
133-3711-312
L1
100 nH, 0603 inductor,
surface mount
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)
(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