Tait TM8100 mobiles, Service Manual

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TM8100/TM8200 Service Manual Circuit Descriptions 87
© Tait Electronics Limited November 2007
The emergency power-sense option can be used in conjunction with any of
the other four options.
The different power-sense options have to be facilitated by hardware means,
as the software cannot act before it is powered up. The radio provides four
hardware links (LK1 to LK4) on the top-side of the main board which can
be configured to attain the power-sense option desired.
Figure 3.10 shows a block diagram of the hardware links LK1 to LK4.
The radio can be programmed to be either on, or to return to its previous
state when the power sense signal is removed. For information on
programming the power-on mode refer to the online help of the
programming software.
The
ON
/
OFF
key can be used with any of the of the power-sense options to
turn the radio on and off.
Figure 3.10 Block diagram of hardware links LK1 to LK4
IOP GPIO7
13V8 BATT
LK2
Auxiliary Power Sense
AUX GPI3
13.8V Battery
13V8 BATT
Power-up
Circuit
(Ignition Sense)
AUX GPI2
LK3
Emergency
Sense
LK4
Internal Options
Power Sense
O
N
/O
FF
Key
LK1
Power Sense