Infinite Peripherals SCOM-100 Manuel d'utilisateur Page 11

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SCOM-100, User guide 11
2.4 Analog inputs
SCOM-100 has 2 built in analog inputs (AI1, AI2). A1 is
designed for voltage input and A2 for current input.
2.4.1 Analog input 1
Analog input 1 is a voltage input with two wiring options.
Wiring option: A1A
The input voltage range for this wiring option is 0-1VDC.
The input resistance is 2K. The input voltage range is
converted internally to a digital raw range of 0-4095.
The circuit displayed on the left side of the page uses a
monolithic semiconductor sensor (AD592) for
temperature measurement. This sensor acts as a high
impedance temperature dependent current source of
1µA/K. The nominal current output is 298µA at 25°C. The
voltage drop on the analog input resistor (2K) is 496mV
at -25°C and 756mV at 105°C. The SCOM-100 power
supply (Vcc) can be used for the sensor’s excitation.
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