User`s manual

XP850020 s I/O Configurations

XP8500 Pin Assignments

The XP8500s eleven 12-bit analog-to-digital converter channels are ac-

cessed through Wago connector H1 (conditioned channels CH0CH3) and

header H2 (unconditioned channels AIN4AIN10), as shown in Fig-

ure3-1. The bias voltage set by J1, VREF+, is available on header H2,

and +5 V (analog) is available on both Wago connector H1 and header H2.

Figure 3-1. XP8500 Pin Assignments

Operating Modes

The XP8500 operates in an absolute mode (as configured in the factory),

or in a ratiometric mode. Jumpers J1 and J2 configure the XP8500 to

operate in either the absolute or ratiometric mode. J1 selects the reference

voltage supplied to the op-amps bias networks, and J2 selects the reference

voltage supplied to the A/D converter chip. Figure 3-2 summarizes the

jumper connections.

Figure 3-2. XP8500 Jumper Settings for Absolute or Ratiometric Modes

GND

CH0

CH1

GND

CH2

CH3

GND

+5ANA

13 14

GND

VREF+

+5ANA

AIN10

AIN9

AIN8

AIN7

AIN6

AIN5

AIN4

Absolute Mode

Ratiometric Mode