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User Manual ICU Range
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7.6 Interface Logic Levels ICU Pro
Interface Logic Level
2x UART Inputs
2x UART Outputs
2x Logic Inputs
2x Logic Outputs
The 2x UART serial ports have been designed to drive out with an open collector
which must be externally pulled up (max. external pull up voltage should not exceed
V
). The UART inputs are protected to allow the user to use logic high input
IN
voltages up to V
. The Input low voltage threshold is 1V, the input high voltage
IN
threshold is 3.1V.
The logic inputs have internal 10K 1% resistors pulled-up to the internally regulated
5V supply which make them suitable for use with open-collector systems and 5V
driven TTL logic systems. The logical inputs are protected to allow the user to use
logic high input voltages as high as V
input high voltage threshold is 3.1V. The outputs are driven using a push-pull 5V
logic output. The source impedance is 470R.
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Logic Low
0V – 0.9V
0V – 0.9V
0V – 0.9V
0V – 0.9V
. The Input low voltage threshold is 1V, the
IN
Logic High
3.1V
3.1V
3.1V
3.1V
Doc: GA00... User Manual ICU Range
Version: 1.0
Page 60 of 68
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