Eurotech BoltGATE 20-25, User Manual

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BoltGATE 20-25 User Manual Rev. 1-1 7 Rear Side Overview
7.7.3 Insulated Odometer Input
7.7.3.1 How the odometer input works
The odometer input is a digital interface that counts the input pulses and detect with them the speed of a
vehicle.
The input, available on pins ODOM+ and ODOM-, is optically insulated and has a programmable threshold
level.
The programmable input threshold allows you to configure the best threshold value for your application; the
input can be seen as a trigger that counts the input pulses and deletes any spurious.
The ODOM+ input is compared with a programmable reference voltage threshold:
l
If the input signal is higher than the programmed high threshold, the logic input is ‘1’
l
If the input signal is lower than the programmed low threshold, the logic input is ‘0’
The programmable reference voltage comes from a 32-steps digital potentiometer (EEPOT: Electrically-
Erasable Potentiometer), which wiper position is set to mid-scale at every power-up.
7.7.3.2 Electrical specifications
The table below shows the electrical specifications odometer input:
Characteristic Value
Voltage Range Minimum: 0 V
Maximum: 32 V
Maximum Input Frequency 10 kHz
7.7.3.3 Electrical schematics
The figure below shows the electrical schematics of the odometer input:
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