Measurement-computing USB-2416 Instrukcja Użytkownika Pobierz pdf (Strona 38)

USB-2416 User's Guide Specifications

Note 5: The external pull-up is connected to the digital output bit through an external pull-up resistor. Adding an external pull-

up resistor connects it in parallel with the internal 47k Ω pull-up resistor of that particular digital input/output bit.

Careful consideration should be made when considering the external pull-up resistor value and the resultant pull-up

voltage produced at the load.

Note 6: Does not include the additional leakage current contribution that may occur when using an external pull-up resistor.

Counter

Table 23. 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 43)

CTR1 (pin 45)

Counter read/writes rates

(software paced)

Counter read System dependent, 500 reads per second.

Counter write System dependent, 500 reads per second.

Input characteristics Each CTRx input pin 562 KΩ pull-up resistor to +5V, 10 kΩ series

resistor

Input voltage range ±15 V maximum

Maximum input voltage range CTR0,CTR1 relative to GND and

DGND (pins

18,36,39,42,44,46,66,81,84,93,94)

±20 V maximum (power on/off)

Input high voltage 1.3 V minimum, 2.2 V maximum

Input low voltage 1.5 V maximum, 0.6 V minimum

Schmitt trigger hysteresis 0.4 V minimum, 1.2 V maximum

Input bandwidth (-3 db)

1 MHz

Input capacitance 25 pf

Input leakage current ±120 nA

Input frequency 1 MHz maximum

High pulse width 500 ns, minimum

Low pulse width 500 ns, minimum

Note 7: The DGND and GND pins (pins 18,36,39,42,44,46,66,81,84,93,94) are common and are isolated from

earth ground.

Memory

Table 24. Memory specifications

EEPROM 4096 bytes isolated micro reserved for sensor configuration

256 bytes USB micro for external application use

Microcontroller

Table 25. 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 ... 33 34 35 36 37 38 39 40 41 42 43 ... 48 49

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