Digital Output Lines - Tait TM8000 Series Applications Manual

3.2

Digital Output Lines

Available Output
Lines
Compatibility
64 Programmable I/O Lines
This section describes the general design principles for use of the
programmable I/O lines configured as outputs, and the output signals which
can be set for them.
The following lines are available to be used as outputs:
Table 3.4 Digital output lines
Signals
AUX_GPIO4...7
IOP_GPIO1...7
CH_GPIO1
a
MIC_GPIO1 (TM8115)
a
PRG_GPIO1 (TM8105)
a. CH_GPIO1 of the control-head connector is the same signal as MIC_GPIO1 of the
microphone connector (TM8115) and PRG_GPIO1 of the programming connector
(TM8105).
For details on the connector pin-outs and electrical characteristics of these
lines refer to "Description of the Radio Interfaces" on page
Table 3.2 describes the compatibility of the output lines with common
industry logic standards:
Table 3.5 Digital output lines - compatibility
Logic standard output compatibility
Output line
3.3V CMOS
AUX_GPIO4...7 Yes
AUX_TXD Yes
IOP_GPIO1...7 Yes
IOP_TXD Yes
CH_TXD Yes
MIC_TXD
PRG_TXD
CH_GPIO1 Yes
MIC_GPIO1
a. While the output levels do not comply with the RS-232 standard, almost all modern
RS-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 level
conversion if the length of the connection cable is <3m.
b. Yes, provided internal pullups to 5V are selected.
c. These outputs can be made 5V CMOS-compatible using a 3.3kΩ pullup resistor to
5V that is provided by the device being driven.
Connector
auxiliary connector
internal options connector input or output
control-head connector
microphone connector
programming connector
5V CMOS
b
Yes
No
c
No
c
No
No
c
No
TM8000 3DK Hardware Developer's Kit Application Manual
September 2003 © Tait Electronics Ltd
Direction
input or output
input or output
15.
a
5V TTL RS-232
Yes No
Yes No
Yes No
Yes No
Yes No
Yes No