Chapter4 SignalConnections
6023E/6024E/6025EUser Manual 4-8 ni.com
Analog Input Signal Overview
Theanalog input signals for these devices are ACH<0..15>, ASENSE, and
AIGND. Connection of these analog input signals to your device depends
onthe type of input signal source and the configuration of the analog input
channelsyou areusing. Thissection providesan o verview of the different
types of signal sources and analog input configuration modes. More
specific signal connection information is provided in the Analog Input
Signal Connections section.

Types of Signal Sources

When configuring the input channels and making signal connections,
you must first determine whether thesignal sources are floating or
ground-referenced.
PFI4/GPCTR1_GATE DIO —Vcc+0.5 3.5 at (Vcc -0.4) 5at0.4 1.5 50kΩpu
GPCTR1_OUT DO — — 3.5at (Vcc -0.4) 5at0.4 1.5 50kΩpu
PFI5/UPDATE* DIO —Vcc+0.5 3.5 at (Vcc -0.4) 5at0.4 1.5 50kΩpu
PFI6/WFTRIG DIO —Vcc+0.5 3.5 at (Vcc -0.4) 5at0.4 1.5 50kΩpu
PFI7/STARTSCAN DIO —Vcc+0.5 3.5 at (Vcc -0.4) 5at0.4 1.5 50kΩpu
PFI8/GPCTR0_SOURCE DIO —Vcc+0.5 3.5 at (Vcc -0.4) 5at0.4 1.5 50kΩpu
PFI9/GPCTR0_GATE DIO —Vcc+0.5 3.5 at (Vcc -0.4) 5at0.4 1.5 50kΩpu
GPCTR0_OUT DO — — 3.5at (Vcc -0.4) 5at0.4 1.5 50kΩpu
FREQ_OUT DO — — 3.5at (Vcc-0.4) 5at0.4 1.5 50kΩpu
AI= Analog Input DIO=Digital Input/Output pu= pullup
AO= Analog Output DO= Digital Output
Note:The tolerance on the 50 kΩpullup and pulldown resistors is very large. Actual value can range between 17 kΩand
100kΩ.
Table4-3. I/O Signal Summary (Continued)
SignalName
Signal
Type and
Direction
Impedance
Input/
Output
Protection
(Volts)
On/Off
Source
(mAat V)
Sink
(mA
atV)
Rise
Time
(ns) Bias