Measurement-computing USB-CTR04 Manual do Utilizador descarregar pdf (Página 20)

USB-CTR04 User's Guide Specifications

Timers

Table 2. Timer specifications

Parameter Specification

Terminal names

TMR0, TMR1, TMR2, TMR3

Timer type

PWM output with count, period, delay, and pulse width registers

Output value

Default state is idle low with pulses high, software-selectable output invert

Internal clock frequency

96 MHz

Effective frequency range

0.022 Hz to 48 MHz

High pulse width

10.42 ns min

Low pulse width

10.42 ns min

Output high voltage

4.4 V min (IOH = –50 µA)

3.76 V min (IOH = –24 mA)

Output low voltage

0.1 V max (IOL = 50 µA)

0.44 V max (IOL = 24 mA)

Output current

24 mA max per pin, constrained to 240 mA across all output pins (counter outputs,

timer outputs, digital outputs, pacer clock output, and +VO)

Digital input/output

Table 3. Digital input/output specifications

Parameter Specification

Digital type TTL

Number of I/O

Configuration

Bit-configurable as input (power on default) or output

Pull-up configuration

The port has a 47 kΩ resistor configurable as a pull-up or pull-down (default) with

an internal jumper.

Digital I/O transfer rate

(system-paced, asynchronous)

33 to 8000 port reads/writes or single bit reads/writes per second typical, system

dependent.

Digital input pacing

Onboard clock, external input scan clock (CLKI)

Digital input trigger source

External single channel digital trigger (TRIG)

Input high voltage

2.0 V min

5.0 V absolute max

Input low voltage

0.8 V max

0 V recommended min

Output high voltage

4.4 V min (IOH = –50 µA)

3.76 V min (IOH = –24 mA)

Output low voltage

0.1 V max (IOL = 50 µA)

0.44 V max (IOL = 24 mA)

Output current

24 mA max per pin, constrained to 240 mA across all output pins (counter

outputs, timer outputs, digital outputs, pacer clock output, and +VO)

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