ST 6100 - HARDWARE GUIDE
Figure 9: Digital Output
Push-pull S1 = Open
Open drain S1 = Closed (Low Impedance)
S1 = Open (High Impedance)
The following tables describe the output specifications.
Push-pull
In the push-pull configuration the output is driven directly from the microprocessor.
Parameter Min. Typical Max. Units
Output high voltage - open circuit 3.14 3.3 3.47 V
Output high voltage (sourcing 25 µA) 2.80 - - V
Output low voltage (sinking 25 µA) - - 0.06 V
Output pulse rate - - 10
1
Hz
Output bandwidth 100 - - Hz
Open Drain
Parameter Min. Typical Max. Units
Sink current (do not exceed) - - 250 mA
Output voltage (sinking 250 mA)
I/O 01 to I/O 03
I/O 04
-
-
1.15
1.40
1.35
1.60
V
V
Turn-On Delay (I/O 04 only) 140 200 280 ms
Absolute limits (high impedance) -10 - 150 V
1
This value is dependent on the Lua services being used. This is not a hardware limitation. The hardware limit is specified by
the output bandwidth.
T406, VERSION 01
20
© ORBCOMM PROPRIETARY
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