OMB-DAQ-2416-4AO 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 47 kΩ 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 27. 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

Counter read

System dependent, 500 reads per second.

(software paced)

 

 

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 maximum

 

 

 

Maximum input voltage range

CTR0,CTR1 relative to GND and

±20 V maximum (power on/off)

 

DGND (pins

 

 

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

 

 

 

 

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 28. Memory specifications

 

 

EEPROM

4096 bytes isolated micro reserved for sensor configuration

 

256 bytes USB micro for external application use

 

 

Microcontroller

 

Table 29. 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)

 

 

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