Tait TM8100 mobiles Service Manual page 88

Table 3.2 Configuration of hardware links and GPI lines for power-sense options
Power-sense option
13.8V battery power
sense
auxiliary power sense
(ignition sense)
internal power sense
no power sense
a. If LK2 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 LK1 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 3.3 Configuration of hardware link LK3 and AUX GPI2 for 'emergency power sense'
External push-button
or toggle switch
required to enter
emergency mode
Yes
No
88 Circuit Descriptions
Table 3.2 shows the configuration of the hardware links LK1, LK2 and LK4
for the individual power-sense options. It also lists the dependence of the
power-sense options with respect to the GPI lines, which can or cannot be
used.
Links Configuration of remaining links and
required use of AUX GPI3 and IOP GPIO7
LK1 in LK2 in:
AUX GPI3 must be left floating.
LK2 out:
AUX GPI3 can be used as GPI
LK4 out IOP GPIO7 can be used as GPIO.
LK2 in LK1 in:
Input line must sink >1mA from
AUX GPI3 (which is pulled to 13.8V by a
Ω
33k resistor). The impedance between
the vehicle ignition signal and ground
must be ≤1k
LK1 out:
Input line must be active high
LK4 out IOP GPIO7 can be used as GPIO.
LK1 out
LK2 out AUX GPI3 can be used as GPI.
LK4 in With LK4 in, the input line must be active
c
high .
LK1 out
LK2 out AUX GPI3 can be used as GPI.
LK4 out IOP GPIO7 can be used as GPIO.
Table 3.3 shows the configuration of 'emergency power sense'. 'Emergency
power sense' can be configured with any of the above power sense options.
Links
Implications on AUX GPI2
required
LK3 in AUX GPI2 must be connected to an
external (hidden) push-button or toggle
switch, which connects it to ground.
LK3 in AUX GPI2 must be left floating
LK3 out AUX GPI2 can be used as GPI.
a
.
Ω
.
b
.
© Tait Electronics Limited November 2007
Voltages
required
10.8V ≤ supply ≤ 16V
AUX GPI3 ≤ 0.7V off
AUX GPI3 ≥ 2.6V high (active)
ignition-sense tolerant to
3.3V, 5V and 12V
IOP GPIO7 ≤ 0.7V off
IOP GPIO7 ≥ 2.6V high
(active)
ignition-sense tolerant to
3.3V and 5V only
10.8V supply 16V
≤ ≤
Voltages required
0.7V active,
≤
floating inactive
TM8100/TM8200 Service Manual