101-0738 Rabbit Semiconductor, 101-0738 Datasheet - Page 88

• Manufacturer Part Number: 101-0738
• Description: CARD ETHERNET 512K SRAM SR9150
• Manufacturer: Rabbit Semiconductor

Specifications of 101-0738

• Accessory Type: Smart Star CPU Card
• For Use With/related Products: SR9150
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

8.2 User Interface
Figure 33 shows the circuit used to condition the analog signal before it goes to the A/D
converter chip. Depending on the model of A/D Converter Card you have, it is designed to
handle analog inputs of 0 V to 10 V, -10 V to +10 V, or 4–20 mA. The two different volt-
age ranges are handled with different gain resistors, R
: 23.7 kΩ for the SR9300 and
g
12.1 kΩ for the SR9310. The input shown in Figure 33 is configured differently for the
SR9320, which handles analog inputs of 4–20 mA.
Input
W
R
BOTTOM
W
Figure 33. Analog Input Amplifier Circuit
The TLC2543 A/D converter chip on the A/D Converter Card uses synchronous Serial Port
B and Timer A5 on the Rabbit 2000 to do the A/D conversions.
Figure 34 shows the complete pinout for the user interface on header J2. Note that pin 1 is
indicated by a small arrow on the ribbon cable connector.
Figure 34. A/D Converter Card User Interface Pinout
88
Smart Star A/D Converter Cards (SR9300)