Measurement-computing USB-2408 Series Manual do Utilizador descarregar pdf (Página 29)

USB-2408 Series User's Guide Specifications

Counter

Table 20. CTR specifications

Parameter

Conditions

Specification

Pin name

CTR0, CTR1

Number of channels

2 channels

Resolution

32-bits

Counter type

Event counter

Input type

Schmitt trigger, rising edge triggered

Input source

CTR0 (pin 44)

CTR1 (pin 42)

Counter read/writes rates

(software paced)

Counter read

System dependent, 500 reads per second.

Counter write

System dependent, 500 writes per second.

Input characteristics

Each CTRx input pin

562 kΩ pull-up resistor to +5 V, 10 kΩ series

resistor

Input voltage range

±15 V max

Max input voltage range

CTR0,CTR1 relative to AGND

and DGND (Note 7)

±20 V max (power on/off)

Input high voltage

1.3 V min, 2.2 V max

Input low voltage

1.5 V max, 0.6 V min

Schmitt trigger hysteresis

0.4 V min, 1.2 V max

Input bandwidth (–3 dB)

1 MHz

Input capacitance

25 pf

Input leakage current

±120 nA@5 V, ±1.6 mA@±15 V

Input frequency

1 MHz, max

High pulse width

500 ns, min

Low pulse width

500 ns, min

Note 7: DGND pins are recommended for use with counter input pins. The DGND and AGND are common

and are isolated from earth ground.

Memory

Table 21. Memory specifications

EEPROM

4096 bytes isolated micro reserved for sensor configuration

256 bytes USB micro for external application use

Microcontroller

Table 22. Microcontroller specifications

Type

One high-performance 8-bit RISC microcontroller with USB interface (non-isolated)

One high-performance 16-bit RISC microcontroller for measurements (isolated)

1 2 ... 24 25 26 27 28 29 30 31 32 33 34

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