ST 9100 - HARDWARE GUIDE
2.4.2 Dedicated Outputs
The transceiver provides two open drain outputs (output_5 and output_6) that can be used to turn on various devices
such as relays, lights or audible alarms. These outputs are capable of sinking current only. Both outputs are
controlled from the host processor. The outputs are not protected against over current conditions and you must
ensure that the maximum current capability of the internal switch is not exceeded. Both outputs include ESD
protection. You must also ensure that the voltage applied to the output pin does not exceed the maximum value as
shown in the table below.
Figure 14: Open Drain Outputs
Parameter Max. Units
Sink Current 250 mA
Applied Voltage 40 V
Internal switch power dissipation 691 mW
Voltage output (sink current = 250 mA) 2.76
(minimum 48 mV)
V
2.4.3 Multi-purpose Ports
In addition to the standard I/Os, the transceiver provides the following multi-function ports.
l Four (4) digital input only ports.
l Four (4) 0-5 V analog input only ports.
l Two (2) 4-20 mA inputs.
Four pins on the interface connector are independently configured to provide the following combinations:
l Four (4) digital inputs or,
l Four (4) 0-5 V analog inputs or,
l Two (2) 4-20 mA inputs or,
l Two (2) digital inputs and two 0-5 V analog inputs or,
T413, Version 0.04 BETA © ORBCOMM
®
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