Digital Input/Output - Measurement Computing TC-32 User Manual

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TC-32 User's Guide
Sensor Sensor
Type Temperature
(°C)
–200
T 0
400
–200
N 0
1300
Thermocouple measurement accuracy specifications include polynomial linearization, cold-junction
compensation, and system noise. The accuracy specifications assume the device is operated within its enclosure
and with the enclosure in a horizontal, upright orientation. The board should also be warmed up for the
recommended 20 minutes. If the maximum digital output load of 3.2 amps is applied, add an additional 0.30°C
to the typical and maximum accuracy specifications listed above. Errors shown do not include inherent
thermocouple error. Contact your thermocouple supplier for details on the actual thermocouple accuracy error.

Digital input/output

Parameter
Number of inputs
Configuration
Input voltage range
Input type
Input characteristics
Maximum input voltage range
Pull-up configuration
Transfer rate (software paced)
Input high voltage
Input low voltage
Schmitt trigger hysteresis
Parameter
Number of outputs
Configuration
Output characteristics
Pull-up configuration
Transfer rate (software-paced)
Output voltage range
Off state leakage current
Sink current capability
DMOS transistor on-resistance
(drain to source)
Note 5: Ground pins labeled IGND are isolated from AGND and chassis ground.
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Accuracy Error Accuracy Error
Maximum (°C), Typical (°C),
15°C to 35°C 15°C to 35°C
2.005 0.923
0.836 0.382
0.544 0.255
2.255 1.038
0.908 0.415
0.718 0.357
Table 5. Digital input specifications
Specification
8 channels
Fixed input
0 V to +15 V
CMOS (Schmitt trigger)
100 kΩ pull-up resistor, 28.7 kΩ series resistor
0 V to +20 V max (power on/off, relative to IGND pins)
All pins pulled up to +5 V via individual 100 kΩ resistors using slide switch SW5.
SW5 default positions are on (pulled up.)
500 port reads per second typ.
1.3 V min, 2.2 V max
1.5 V max, 0.6 V min
0.4 V min, 1.2 V max
Table 6. Digital output specifications
Specification
32 channels, shared with alarms
Open drain output
100 kΩ pull-up, open drain (DMOS transistor)
All pins pulled up to +5 V via individual 100 kΩ resistors using slide switches
SW1-SW4. The default positions for SW1-4 are on (pulled up.)
Digital output – 500 port writes per second typ.
0 V to +5 V (internal 100 kΩ pull-up resistors connected to +5 V by default)
0 V to +15 V max (using external pull up resistor)
0.1 µA
100 mA max (continuous) per output pin
4 Ω
20
(603) 746-5524
Accuracy Error Accuracy Error
Maximum (°C), Typical (°C),
0°C to 45°C 0°C to 45°C
2.207 1.005
0.874 0.400
0.659 0.297
2.481 1.134
0.949 0.437
1.157 0.510
Specifications