TM9300/TM9400 Installation Guide
Power Sense and Connector Power Supply Options
21
© Tait Limited
December 2015
shows the configuration of ‘emergency power sense’.
‘Emergency power sense’ can be configured with any of the above power
sense options.
Table 3.1
Configuration of hardware links and GPI lines for power-sense options
Power-sense option
Links
required
Configuration of remaining links and
use of AUX GPI3 and IOP GPIO7
Voltages required
13.8V battery power
sense
LK1M in
LK2M in:
AUX GPI3 must be left floating.
10.8V
≤
supply
≤
16V
LK2M out:
AUX GPI3 can be used as GPI
a
.
LK4M out IOP GPIO7 can be used as GPIO.
auxiliary power sense
(ignition sense)
LK2M in
LK1M in:
Input line must sink >1mA from
AUX GPI3 (which is pulled to 13.8V by a
33k
Ω
resistor). The impedance
between the vehicle ignition signal and
ground must be
≤
1k
Ω
.
AUX GPI3
≤
0.7V off
AUX GPI3
≥
2.6V high
(active)
ignition-sense tolerant to
3.3V, 5V and 12V
LK1M out:
Input line must be active high
b
.
LK4M out IOP GPIO7 can be used as GPIO.
internal power sense
LK1M out
IOP GPIO7
≤
0.7V off
IOP GPIO7
≥
2.6V high
(active)
ignition-sense tolerant to
3.3V and 5V only
LK2M out AUX GPI3 can be used as GPI.
LK4M in
With LK4M in, the input line must be
active high
c
.
no power sense
LK1M out
10.8V
≤
supply
≤
16V
LK2M out AUX GPI3 can be used as GPI.
LK4M out IOP GPIO7 can be used as GPIO.
a. If LK2M is out and AUX GPIO is not used, R775 (33k) should be placed to ensure that AUX GPI3 does not float
(R775 is not placed by factory default).
b. If LK1M is out and R775 is placed, AUX GPI3 should be driven low as well.
c. If LK 4 is in and R723 is placed, IOP GPIO7 should be driven low as well. (R723 is placed by factory default.)
Table 3.2
Configuration of hardware link LK3M and AUX GPI2 for ‘emergency power sense’
External push-button
or toggle switch
required to enter
emergency mode
Links
required
Implications on AUX GPI2
Voltages required
Yes
LK3M in
AUX GPI2 must be connected to an
external (hidden) push-button or toggle
switch, which connects it to ground.
≤
0.7V active,
floating inactive
No
LK3M in
AUX GPI2 must be left floating
LK3M out AUX GPI2 can be used as GPI.
