Counter Input; Timer Output; Power Output; Ground - Measurement Computing USB-1608G-OEM User Manual

USB-1608G-OEM User's Guide
Retrigger mode
Retrigger mode lets you set up repetitive analog input or output trigger events. The trigger is automatically re-
armed after it is activated. Use software to set the A/D or D/A trigger count (the number of samples you want
per trigger).

Counter input

The CTR0 and CTR1
internal counter increments when the TTL levels transition from low to high.

Timer output

The terminal is a pulse width modulation (PWM) timer output that can generate a pulse output with a
TMR
programmable frequency in the range of 0.0149 Hz to 32 MHz. The timer output parameters are software
selectable. Figure 8 shows the timer output schematic.

Power output

The +5V terminal can output up to 10 mA maximum. You can use this terminal to supply power to external
devices or circuitry.
Caution! The
+5V
device and possibly the computer.

Ground

The analog ground (
AGND
The digital ground (
GND
channels and the power terminal.
terminals are 32-bit event counters that can accept frequency inputs up to 20 MHz. The
Figure 8. Timer output schematic
terminal is an output. Do not connect to an external power supply or you may damage the
) terminals provide a common ground for all analog channels.
) terminals provide a common ground for the digital, counter, timer, and clock
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Functional Details