User manual

Chapter 4 Connecting Signals

Table 4-1.

Signal Descriptions for I/O Connector Pins

Signal Name Reference Direction Description

AIGND — — Analog Input Ground—These pins are the reference point

for single-ended measurements in RSE configuration and

the bias current return point for differential measurements.

All three ground references—AIGND, AOGND, and

DGND—are connected together on your device.

ACH<0..15> AIGND Input Analog Input Channels 0 through 15—Each channel pair,

ACH<i, i+8> (i = 0..7), can be configured as either one

differential input or two single-ended inputs.

AISENSE AIGND Input Analog Input Sense—This pin serves as the reference node

for any of channels ACH<0..15> in NRSE configuration.

DAC0OUT

AOGND Output Analog Channel 0 Output—This pin supplies the voltage

output of analog output channel 0.

DAC1OUT

AOGND Output Analog Channel 1 Output—This pin supplies the voltage

output of analog output channel 1.

AOGND — — Analog Output Ground—The analog output voltages are

referenced to this node. All three ground references—

AIGND, AOGND, and DGND—are connected together on

your device.

DGND — — Digital Ground—This pin supplies the reference for the

digital signals at the I/O connector as well as the +5 VDC

supply. All three ground references—AIGND, AOGND,

and DGND—are connected together on your device.

DIO<0..7> DGND Input or

Output

Digital I/O signals—DIO6 and 7 can control the up/down

signal of general-purpose counters 0 and 1, respectively.

+5 V DGND Output +5 VDC Source—Thesepinsarefusedforupto1Aof

+5 V supply. The fuse is self-resetting.

SCANCLK DGND Output Scan Clock—This pin pulses once for each A/D conversion

in scanning mode when enabled. The low-to-high edge

indicates when the input signal can be removed from the

input or switched to another signal.

EXTSTROBE* DGND Output External Strobe—This output can be toggled under software

control to latch signals or trigger events on external devices.

UM.book Page 3 Monday, May 14, 2001 10:32 AM