Digital Input/Output; External Trigger - Measurement Computing USB-7204 User Manual

USB-7204 User's Guide

Digital input/output

Parameter
Digital type
Number of I/O
Configuration
Pull up/pull-down configuration
Input high voltage
Input low voltage
Output high voltage
(IOH = –2.5 mA)
Output low voltage
(IOL = 2.5 mA)
Power on and reset state

External trigger

Parameter
Trigger source (Note 7)
Trigger mode
Trigger latency
Trigger pulse width
Input high voltage
Input low voltage
Input leakage current
TRIG_IN is a Schmitt trigger input protected with a 1.5 kΩ series resistor.
Note 7:
Table 11. Digital I/O specifications
Specification
CMOS
16 (Port 0 bit 0 through bit 7, Port 1 bit 0through bit 7)
2 banks of 8
All pins configurable via jumpers (JP1 and JP2) to Vs or Ground via 47 k resistors.
JP1 configures Port 1, and JP2 configures Port 0.
2.0 V min, 5.5 V absolute max
0.8 V max, –0.5 V absolute min
3.8 V min
0.7 V max
Input
Table 12. Digital trigger specifications
Conditions
External digital
Software-selectable
24
Specification
TRIG_IN
Edge sensitive: user configurable for CMOS compatible
rising or falling edge.
10 µs max
1 µs min
4.0 V min, 5.5 V absolute max
1.0 V max, –0.5 V absolute min
±1.0 µA
Specifications