© 2017 Jackson Labs Technologies, Inc.
13
RSR GNSS Transcoder™ User Manual
the RSR GNSS Transcoder™ is about 0.12A at 12V without the CSAC option, and about 0.14A with
the CSAC option installed.
3.3 Alternate Powering Supply Options
The RSR GNSS Transcoder™ module has the capability to provide power to the external GNSS
receiver via pin 11 of connector J4. This pin has multiple usage capabilities as listed below:
3.3.1 Powering external GNSS receivers
The RSR GNSS Transcoder™ includes connector J4 with signals designed to interface glue-lessly to
an external GNSS receiver such as the Rockwell RSR SAASM Puck. It provides power to the
external GNSS receiver, as well as RS-232 level serial communications and TTL/CMOS level 1PPS
interfacing from the external GNSS receiver. External GNSS receivers are assumed to be compatible
to a prime-power input of between 2.7V and 5.5V, with 5V nominal.
When connecting pin 11 of J4 to the prime-power input of the Rockwell RSR Puck or other external
GNSS receivers, the unit will provide either the supplied USB voltage (2.7V to 5.5V range) to the
Puck, or it will provide an internally regulated 5.4V supply (whichever is the higher of the two)
generated from the external 7V to 36V DC prime-power port. The Rockwell Puck or other external
GNSS receiver can thus be fully powered by connector J4 of the RSR GNSS Transcoder™ module
and does not require any other wiring connections than those to the transcoder module.
3.3.2 Powering the RSR GNSS Transcoder™ from an external
LiPo or LiIon single-cell battery
While the primary use of pin 11 of connector J4 is to provide a regulated power to an external GNSS
receiver, pin 11 of J4 can alternatively be used as a power input to the RSR GNSS Transcoder™ as
well as the Rockwell RSR Puck or other external GNSS receiver from a single-cell LiPo or LiIon
battery. Pin 11 will then act as a power-input to the RSR GNSS Transcoder™, and voltages between
2.7V to 5.5V can be applied, with a typical LiPo battery providing a range of 4.2V (charged) to 3.7V
(dis-charged). The 4.2V battery power is typically split up and fed to the prime-power input of the
Rockwell RSR Puck, as well as into pin 11 of connector J4 of the RSR GNSS Transcoder™.
USB
power and power to pin 2 of J11 must not be connected when using pin 11 of J4 as the prime
power input to the RSR GNSS Transcoder™.
Please note that the RSR GNSS Transcoder™ nor the Rockwell RSR Puck
DO NOT
disable the
current draw (do not disconnect the battery) when the LiPo minimum allowable battery voltage of
3.7V is reached, and continuing to operate the RSR GNSS Transcoder™ from the LiPo or LiIon
battery below 3.7V cell voltage may damage the battery or cause a battery fire. The user
must
disconnect the battery externally before the terminal cell voltage of 3.7V is reached. External charge
and control IC’s are readily available that prevent under-voltage conditions on LiPo/LiIon batteries,
and these should be used when using the system with direct battery power on any of the power input
connections.
Please note that if power is applied to the USB port or the DC 7V to 36V port that the external
LiPo/LiIon battery will be charged with up to 5.5V. This can result in battery failure and a
battery fire, and thus simultaneous operation of a battery connected to J4 pin 11 and any other
external power source is not allowed.
Содержание RSR GNSS Transcoder
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