Measurement-computing USB-1608HS Instrukcja Użytkownika Pobierz pdf (Strona 25)

USB-1608HS User's Guide Specifications

Digital input/output

Table 6. Digital I/O specifications

Digital type

5 V CMOS

Number of I/O

Configuration

Eight input, eight output

Pull-up/pull-down configuration

The eight input pins have 47 k resistors that may be configured to either pull-up

or pull-down with a jumper

Digital I/O transfer rate (system-paced)

System-dependent, 33 to 8000 port reads/writes or single bit reads/writes per

second.

Input high voltage

2.0 V minimum, 5.5 V absolute maximum

Input low voltage

0.8 V maximum, –0.5 V absolute minimum

Output high voltage (IOH = –2.5 mA)

3.8 V minimum

Output low voltage (IOL = 2.5 mA)

0.7 V maximum

Power on and reset state

Outputs: driven low

LED indicators

Each I/O pin has an associated LED status indicator. A high at the pin will

cause the LED to be on. The LEDs may be disabled with jumpers - one jumper

for the input LEDs (JP1), and one jumper for the output LEDs (JP2).

External trigger

Table 7. External trigger specifications

Parameter

Conditions

Specification

Trigger source

TRIG_IN input

Trigger input range

±10 V max.

Absolute maximum input voltage

TRIG_IN to GND

±25 V maximum (power on)

±15 V maximum (power off)

Trigger threshold levels

±10V/4096; Software configurable

Input impedance

1 MΩ (power on)

1.5 kΩ (power off)

Trigger modes

Software configurable for:

 Positive or negative slope

 Edge/level

 Retrigger

Threshold resolution

12 bits, 1 in 4096

Threshold accuracy

±0.25% FSR

Hysteresis

±5 mV

Full power bandwidth (-3 dB)

640 kHz

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 31

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