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LA000504D © 2006 Navman New Zealand. All rights reserved. Proprietary information and specifications subject to change without notice.
4.3 Data input/output levels
All communication between the Jupiter 110 and external devices is through the I/O (input/output)
connector. The I/O data is CMOS serial.
The I/O connector voltage levels measured at PWR_IN = 3 V are shown in Table 4-4.
Signals
Parameter
Value
TXD, RXD
& BOOT
V
IH
(min)
2.0 V
V
IH
(max)
0.1
V
IL
(min)
0.1 V
V
IL
(max)
0.8 V
V
OH
(min) at
I
OH
0.5 mA
2.0 V
V
OH
(max)
PWR_IN
V
OL
(min)
0
V
OL
(max) at
I
OL
–0.5 mA
1.0 V
Table 4-4: Input/output voltage levels
5.0 Interfaces
5.1 External antenna connector
The RF connector for the external antenna is an MMCX type jack straight connector. This
connector is available on the Jupiter 110R and the Jupiter 110RS.
5.1.1 External antenna voltage
DC power is supplied to the external antenna from the main power supply via the internal
antenna selection switch.
The external antenna characteristics are shown in Table 5-1.
Parameter
External
antenna current
Notes
internal patch antenna to external
antenna switchover threshold
5 mA
external antenna to internal patch
antenna switchover threshold
1 mA
reducing the external antenna current
from 5 to 1 mA will result in switchback
to the internal patch antenna
external antenna over current
latch threshold
80 mA
external antenna over current
reset threshold
200 µA
reducing the current from 80 mA to
200 µA, or no load, will result in the
DC supply being made available to the
internal patch antenna. To reset the
‘over current’ trip, remove power from
the unit for >3 s.
Table 5-1: External antenna characteristics
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