Micro-JLT GNSS™ User Manual
8 © 2019 Jackson Labs Technologies, Inc.
Table 2.1 shows the Micro-JLT GNSS™ revision 1.0 hardware pin descriptions
Table 2.1 Micro-JLT GNSS™ hardware connectors
Ref Name Function
Specification
Description
J1 Pin 1 ISP# Enables In System
Programming mode
(ISP)
0V to 3.3V, pulled-high by 4.7K
resistor
Pull to Ground during power-on to
set processor into ISP mode.
Leave floating during normal
operation
J1 Pin 2 Ground Ground Ground Ground
J1 Pin 3 1PPS OUT-P LVDS 1PPS positive
signal output
LVDS level, positive signal Flywheel OCXO-generated 1PPS
output in LVDS level
J1 Pin 4 1PPS OUT-N LVDS 1PPS negative
signal output
LVDS level, negative signal Flywheel OCXO-generated 1PPS
output in LVDS level
J1 Pin 5 TX-Serial-P RS-422 positive signal
output / TXD_TTL
RS-422 level, positive signal /
TTL level
RS-422 positive signal / TTL
NMEA and SCPI communications
port output from unit
J1 Pin 6 TX-Serial-N RS-422 negative signal
output
RS-422 level, negative signal RS-422 NMEA and SCPI
communications port output from
unit, negative signal
J1 Pin 7 RX-Serial-P RS-422 positive signal
input / RXD_TTL
RS-422 level, positive signal /
TTL level
RS-422 positive signal / TTL SCPI
communications port input to unit
J1 Pin 8 RX-Serial-N RS-422 negative signal
input
RS-422 level, negative signal RS-422 SCPI communications
port input to unit, negative signal
J1 Pin 9 Ground Ground Ground Ground
J1 Pin 10 +5.5V Power Prime Power Input +5.5V, -0.3V +0.5V max Prime Power input. 2.6W typical
steady-state, up to 8W during
warmup. Connect to J1 pin 12
J1 Pin 11 LOCK-OK/
EVENT#
Indicates Event, Alarm,
and LOCK-OK
conditions
3.3V == unit locked and healthy
0V == Event or Alarm exist
Output will turn on (3.3V) when
unit is warmed up, locked to
GNSS, and healthy. Output will
turn off (0V) when an event is
pending, and alarm happened, or
no GNSS signal is present. Query
the SYNC:HEALTH? indicator for
more details on the event/alarm
state.
J1 Pin 12 +5.5V Power Prime Power Input +5.5V, -0.3V +0.5V max Prime Power input. 2.6W typical
steady-state, up to 8W during
warmup. Connect to J1 pin 10
J2 GNSS Antenna Antenna Input L1, +3.3V output, <=40mA Supplies 3.3V to an external
active GNSS antenna
J3 10MHz output 10MHz Sine Wave
Output
+8.5dBm, +/-0.5 dBm 10MHz output driven by on-board
OCXO. Does not require a load if
unused.
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