Garmin 15 H Series, Технические характеристики, Страница: 10 / 40

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2 WIRE DESCRIPTIONS AND WIRING DIAGRAMS
The GPS 15xL-F and GPS 15xH-F use an eight contact flex circuit LIF connector. The GPS 15xL-
W and GPS 15xH-W use an eight pin JST connector (mating wire harness included). (See 1.5.1.3
for details.)
2.1 WIRE DESCRIPTIONS
GPS
15xH/15x
L
Pin #
Signal Name Description
1 BACKUP
POWER
This input provides external power to the battery-backed SRAM
and real-time clock. This enables the user to provide backup
power if needed for longer than the on-board rechargeable battery
will provide (roughly 21 days). Input voltage must be b2.8
and +3.4 Vdc.
2 GROUND Power and Signal Ground
3 POWER GPS 15xL: +3.3 to +5.4 Vdc (±100 mV ripple) input. Peak
operating current is 100 mA. Nominal operating current is 85 mA.
This voltage drives an LDO with a nominal 3.0 Vdc output.
GPS 15xH: Unregulated 8.0 to 40.0 Vdc input. Peak operating
current is 40 mA @ 12 Vdc input. Nominal operating current is 33
mA @ 12 Vdc input. This voltage drives a switching regulator with
a nominal 3.3 Vdc output. Although a regulated supply is not
required, the peak-to-peak voltage ripple on this line should be
kept to less than 100 mV.
4 PORT 1
DATA OUT
Asynchronous Serial Output.
RS-232 compatible output normally provides serial data which is
formatted per
NMEA 0183, Version 2.0
. This output is also
capable of outputting phase data information; see Appendix B:
Garmin Binary Output Format for details. The NMEA 0183 baud
rate is selectable in the range of 300 to 38400 baud. The default
baud rate is 4800.
5 PORT 1
DATA IN
First Asynchronous Serial Input.
RS-232 compatible with maximum input voltage range of -25 < V <
25. This input may also be directly connected to standard 3 to 5
Vdc CMOS logic that uses RS-232 polarity. The low signal voltage
requirement is < 0.6 Vdc, and the high signal voltage requirement
is > 2.4 V. Minimum load impedance is 500 Ω . This input may be
used to receive serial initialization/ configuration data as specified
in Section 4.1 Received NMEA 0183 Sentences.
6 RF BIAS This input allows the user to externally apply an RF bias to the
active antenna. By default, the unit will use an internal voltage to
power the active antenna. If an external voltage greater than the
internal voltage of the center pin of the antenna (between 3.5 Vdc
and 8.0 Vdc) is detected at this input, the GPS 15xH/15xL will
automatically changes to the external voltage. The antenna must
not draw more than 60 mA.
7 MPO
Measurement Pulse Output.
Typical voltage rise and fall times are 300 ns. Impedance is 150 Ω .
Open circuit output voltage is low = 0 Vdc and high = Vin in the
GPS 15xL, and low = 0 Vdc and high = 5.0 Vdc in the GPS 15xH.
The default format is a 100 ms wide active-high pulse at a 1 Hz
rate; the pulse width is configurable in 20 ms increments. The
rising edge is synchronized to the start of each GPS second. This
output provides between 800 mVp-p to 1.7 Vp-p for GPS 15xL and
1.4 Vp- p for the GPS 15xH into a 50 Ω load. The pulse time
measured at the 50% voltage point will be about 50 ns earlier with
a 50 Ω load than with no load.