Tait TM8000 Series Applications Manual

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Tait TM8000 Series Applications Manual Manual pdf 64 page image

64 Programmable I/O Lines TM8000 3DK Hardware Developer’s Kit Application ManualSeptember 2003 © Tait Electronics Ltd3.2 Digital Output LinesThis section describes the general design principles for use of theprogrammable I/O lines configured as outputs, and the output signals whichcan be set for them.Available OutputLinesThe following lines are available to be used as outputs:For details on the connector pin-outs and electrical characteristics of theselines refer to “Description of the Radio Interfaces” on page 15.Compatibility Table 3.2 describes the compatibility of the output lines with commonindustry logic standards:Table 3.4 Digital output linesSignals Connector DirectionAUX_GPIO4…7 auxiliary connector input or outputIOP_GPIO1…7 internal options connector input or outputCH_GPIO1MIC_GPIO1a (TM8115)PRG_GPIO1a (TM8105)a. CH_GPIO1 of the control-head connector is the same signal as MIC_GPIO1 of themicrophone connector (TM8115) and PRG_GPIO1 of the programming connector(TM8105).control-head connectormicrophone connectorprogramming connectorinput or outputTable 3.5 Digital output lines - compatibilityOutput lineLogic standard output compatibility3.3V CMOS 5V CMOS 5V TTL RS-232 aa. While the output levels do not comply with the RS-232 standard, almost all modernRS-232 level conversion devices are 3.3V/5V CMOS or TTL level-compatible. There-fore, it usually possible to drive modern external RS-232 devices directly without levelconversion if the length of the connection cable is <3m.AUX_GPIO4…7 Yes Yes bb. Yes, provided internal pullups to 5V are selected.Yes NoAUX_TXD Yes No Yes NoIOP_GPIO1…7 Yes No cc. These outputs can be made 5V CMOS-compatible using a 3.3kΩ pullup resistor to5V that is provided by the device being driven.Yes NoIOP_TXD Yes No c Yes NoCH_TXDMIC_TXDPRG_TXDYes No Yes NoCH_GPIO1MIC_GPIO1Yes No c Yes No