Measurement-computing USB-2627 Instrukcja Użytkownika Pobierz pdf (Strona 24)

USB-2627 User's Guide Specifications

Timer output

Table 14. Timer output specifications

Parameter

Specification

Terminal name

TMR0, TMR1, TMR2, TMR3

Number of channels

4 channels

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

Input source

68-pin SCSI: TMR0 (pin 3), TMR1 (pin 37)

40-pin (J4): TMR0 (pin 33), TMR1 (pin 32)

40-pin (J5): TMR2 (pin 31), TMR3 (pin 35)

Internal clock frequency

64 MHz

32-bit

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 = –1.0 mA)

Output low voltage

0.1 V max (IOL = 50 µA)

0.44 V max (IOL = 1.0 mA)

Output waveform

Square wave

Output rate

64 MHz base rate divided by 2

; software-selectable.

Memory

Table 15. Memory specifications

Parameter

Specification

Data FIFO

4 kS analog input/2 kS analog output

Non-volatile memory

32 KB (30 KB firmware storage, 2 KB calibration/user data)

Power

Table 16. Power specifications

Parameter

Condition

Specification

Supply current (Note 4, Note 5)

Quiescent current

360 mA

+VO output voltage range

4.25V to 5.25V

+VO output current

10 mA max

Note 4: This is the total quiescent current requirement for the device that includes up to 10 mA for the Status

LED. This value does not include potential loading of the DIO bits, +VO pin, or the XDACx outputs.

Note 5: USB 2.0 ports are required by USB 2.0 standards to supply 2500 mW (nominal at 5 V, 500 mA).

Self-powered hubs and externally-powered root port hubs provide up to 500 mA of current for a USB

device. Battery-powered root port hubs, such as in a laptop PC, provide 100 mA or 500 mA, depending

on the manufacturer. If your laptop is constrained to the 100 mA maximum, you need to purchase a

self-powered hub.

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