Manual USB-IDIO-16
15
Chapter 7: Specification
Isolated Inputs
Number of inputs:
Sixteen
Type:
Non-polarized, optically isolated from each other and from the computer
Voltage Range:
3 to 31 DC or AC RMS (40 Hz to 10 kHz) (CMOS compatible)
Isolation:
500V
*
(see note) channel-to-ground or channel-to channel
Input Resistance:
1.8K ohms in series with opto coupler
Filter Response:
Rise Time = 4.7 mS / Fall Time = 4.7 mS
Non-Filter Response: Rise Time = 10 uS / Fall Time = 30 uS
Isolated FET Outputs
Number of outputs:
Sixteen Solid State FET’s (off @ power up)
Output Type:
High Side Power MOSFET Switch. Protected against short circuit, over-
temperature, ESD, can drive inductive loads.
Voltage Range:
5-34VDC recommended (customer supplied) for continuous use, 40VDC
absolute maximum
Current Rating:
2A maximum
Turn-on time:
90 uS (typical)
Turn-off time:
110 uS (typical)
Power Required
5V @ 35mA typical (all FETs off, add 5mA per FET)
5V @ 115mA typical (all FETs on)
5VDC provided via USB cable up to 500mA**
**optional external power supply can be ordered if desired if current use of the board is expected to be greater
than what can be supplied by the USB cable.
Environmental
Operating Temp:
0 - 70
o
C (Non-icing)
*
Notes on Isolation: Opto-Isolators and connectors are rated for at least 500V, but isolation voltage breakdowns
will vary and is affected by factors like cabling, spacing of pins, spacing between traces on the PCB, humidity,
dust and other environmental factors. This is a safety issue so a careful approach is required. For CE
certification on the front end of the circuitry, isolation was specified at 40V AC and 60V DC. The design
intention was to eliminate the influence of common mode. Use proper wiring techniques to minimize voltage
between channels and to ground. For example, when working with AC voltages do not connect the hot side of
the line to an input. Tolerance of higher isolation voltage can be obtained on request by applying a conformal
coating to the board.
