22
Power Sense and Connector Power Supply Options
TM9300/TM9400 Installation Guide
© Tait Limited
December 2015
Battery Power
Sense
With this option, link LK1M co13V8 BATT of the power
connector to the power-up circuitry. With this option, when a 13.8V supply
is connected to the radio, the radio enters the programmed power-on mode.
The ON/OFF key can then be used to switch the radio on and off.
This option has the disadvantage that the radio still draws about 50mA
after being switched off using the ON/OFF key. The reason is that the radio
enters the stand-by mode and does not shut down completely.
Auxiliary Power
Sense
(Ignition Sense)
This option uses the digital input line AUX GPI3 of the auxiliary connector
to power the radio up and down. Link LK2M is required to connect the line
to the power-up circuitry. The line is active high; it is on when the level
exceeds 2.6V and off when the level falls below 0.7V; the line tolerates
maximum inputs equal to the radio supply voltage. When the line becomes
active, the radio enters the programmed power-on mode. The ON/OFF key
can then be used to switch the radio on and off. With the radio off and the
line active, the radio draws about 50mA. When the line becomes inactive,
the radio is shut down completely regardless of whether it was on or in
stand-by mode. With the line inactive the radio draws less than 3mA.
In a vehicle installation this avoids flattening the battery when the ignition
key is off.
Caution
If the radio is configured for auxiliary power sense, i.e.
+13.8V from the ignition is supplied to pin AUX GPI3, and a Y-type
breakout cable (such as T02-00009-0301/0302 or TA3101-01) is used,
+13.8V will also be present at AUX_GPI3 of the free connector and
therefore must be left unconnected.
Internal-Options
Power Sense
This option is similar to the auxiliary power-sense option, except that the
IOP GPIO7 line of the internal options connector is used. Link LK4M is
required to connect the line to the power-up circuitry. This line is active
high; it is on when the level exceeds 2.6V and off when the level falls
below 0.7V; the line tolerates maximum inputs of 5V. The behavior of the
ON/OFF key is the same as with the auxiliary power-sense option.
No Power Sense
If no power-sense option is selected, the radio can only be powered up and
powered down by means of the ON/OFF key. For this option, the links
LK1M, LK2M and LK4M must be removed. The advantage of this option
over the battery power-sense option is that the radio draws less than 1mA
when it is switched off.
Emergency
Power Sense
This option uses the AUX GPI2 line of the auxiliary connector. Externally,
this line is typically connected to a hidden switch. Internally, link LK3M is
required to connect the line to the power-up circuitry. The line is active low
and has an internal pull-up resistor to the external supply voltage. The line
is on when the level falls below 0.7V. When the line becomes active (when
the hidden switch is pressed for two seconds) the radio enters the
emergency mode. This mode can also be activated by making an
emergency call or by pressing a key that has been programmed
