Tait TM8000 Series Applications Manual

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Tait TM8000 Series Applications Manual Manual pdf 125 page image

TM8000 3DK Hardware Developer’s Kit Application Manual Power Sense Options 125September 2003 © Tait Electronics Ltd7.4 No Power Sense (On/Off Key Only)With this option, the on/off key is the only way to power up the radio.Use this option, when the ‘auxiliary’ or ‘internal options power sense’options are not required and when it is not important if the radio does notpower up when the radio is initially connected to power. The advantage ofthis option over ‘13.8V battery power sense’ is that the radio draws <1mAwhen off.Application Use this option, when the radio needs to respond only to control head keypresses, the radio must always be off when power is applied, and use minimalpower when off.7.5 Emergency Power SenseEmergency control is usually installed in situations where the radio usercould be in possible danger (e.g. taxis, armoured vehicles, police etc.) orwhere there could be a medical emergency (e.g. buses etc.). An emergencycall or programmable key press can activate emergency mode. As aprogrammable option, emergency mode can also be activated by pressing ahidden emergency button for two seconds.‘Emergency power sense’ uses the AUX_GPI2 line of the auxiliaryconnector and is connected to the power-up circuitry via hardware linkLK3. This line is active low ≤ 0.7V and has an internal pull-up to the radiosupply voltage. Activation of ‘emergency power sense’ will power up theradio and enter the emergency mode.Note The emergency mode can also be entered through the input linesof the internal options connector, however these input lines donot use ‘emergency power sense’ and the radio will not be pow-ered up.For more information on the emergency mode see the online help of theprogramming application.