The analog expansion connector allows for the addition of multiple analog input sensors, such as single and differential 4-20 mA sensors, as well as single and differential analog inputs, analog outputs, and temperature sensors. See the diagrams below for exact signal pins.
Analog Inputs
Pins AD8-A15 can all be used to interface with single and differential 4-20 mA sensors, as well as single and differential analog inputs.
Figure 1: Analog Expansion Inputs
The wiring above shows a differential analog input sensor connected to the analog expansion pins AD8 and AD9. AD8-AD15 can also be used, and operate in the same manner as AD0-AD7.
Analog Outputs
The analog expansion connector also allows the iSIC to interface with an additional analog output device using the DA1 pin.
Figure 2: Analog Expansion Outputs
The wiring above shows an Analog Output sensor connected to the analog expansion pins DA1 and AGND. DA1 operates in the same way as DA0.
Temperature Sensors
The analog expansion connector also allows the direct interface of a N110 temperature sensor to the iSIC using T0 and T1. Simply connect the sensor’s positive lead to the +, and negative lead to – pins of the same T channel as shown in the diagram below:
Figure 3: Adding a Temperature Sensor to iSIC Analog Expansion
REV: 13G11