Measurement-computing USB-2416 User Manual Page 37
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USB-2416 User's Guide Specifications
37
Analog input calibration
Table 20. Analog input calibration specifications
Parameter Specifications
Recommended warm-up time 45 minutes minimum
Calibration Firmware calibration
Calibration interval 1 year
Calibration reference +10.000 V, ±5 mV maximum. Actual measured values stored in EEPROM
Tempco: 5 ppm/°C maximum
Long term stability: 30 ppm/1000 hours
Digital input/output
Table 21. Digital input specifications
Number of I/O 8 channels
Configuration Each DIO bit can be independently read from (DIN) or written to (DOUT).
The DIN bits can be read at any time whether the DOUT is active or tri-stated.
Input voltage range 0 to +15 V
Input type CMOS (Schmitt trigger)
Input characteristics 47 kΩ pull-up/pull-down resistor, 28 kΩ series resistor
Maximum input voltage range 0 to +20 V maximum (power on/off, relative to DGND pins 93 and 94)
Pull-up/pull-down
configuration
All pins pulled up to +5 V via individual 47 kΩ resistors (the JP1 shorting block
default position is pins 1 and 2).
Pull down capability is available by placing the JP1 shorting block across pins 2 and 3.
Transfer rate (software paced) 500 port reads or single bit reads per second typical.
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
Note 2: DGND pins (pins 93, 94) are recommended for use with digital input and digital output pins. The DGND and GND
pins are common and are isolated from earth ground.
Table 22. Digital output specifications
Number of I/O 8 channels
Configuration Each DIO bit can be independently read from (DIN) or written to (DOUT).
The DIN bits may be read at any time whether the DOUT is active or tri-stated
Output characteristics 47k Ω pull-up, open drain (DMOS transistor)
Pull-up configuration All pins pulled up to +5 V via individual 47 kΩ resistors (the JP1 shorting block
default position is pins 1 and 2).
Transfer rate (software paced) Digital output – 500 port writes or single-bit writes per second typical.
Output voltage range 0 to +5 V (no external pull up resistor, internal 47 kΩ pull-up resistors connected to
+5V by default)
0 to +15 V maximum (Note 5)
Drain to source breakdown
voltage
+50 V minimum
Off state leakage current
(Note 6)
0.1 µA
Sink current capability 150 mA maximum (continuous) per output pin,
150 mA maximum (continuous) for all eight channels
DMOS transistor on-resistance
(drain to source)
4 Ω
Note 3: Each DMOS transistor’s source pin is internally connected to GND.
Note 4: DGND pins (pins 93, 94) are recommended for use with digital input and digital output pins. The DGND and GND
pins are common and are isolated from earth ground.
- User's Guide 1
- HM USB-2416 2
- Table of Contents 3
- Chapter 5 4
- About this User's Guide 5
- Introducing the USB-2416 6
- Installing the USB-2416 7
- Installing the software 8
- Installing the hardware 8
- Configuring the hardware 9
- Functional Details 12
- Screw terminal wiring 13
- Analog/TC input terminals 13
- Analog input mode 14
- Thermocouple inputs 14
- Input isolation 16
- Digital I/O 17
- Figure 15. Location of JP1 19
- USB-2416 mechanical drawings 20
- Calibrating the USB-2416 21
- Specifications 22
- Channel configurations 23
- Accuracy 23
- Input bandwidth 34
- Noise performance 34
- Channel switching error 35
- Throughput rate 36
- Analog input calibration 37
- Digital input/output 37
- Counter 38
- Microcontroller 38
- USB specifications 39
- Environmental 39
- Mechanical 40
- Screw terminal pinout 41
- Declaration of Conformity 48
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