TC-32 User's Guide
Specifications
20
Sensor
Type
Sensor
Temperature
(°C)
Accuracy Error
Maximum (°C),
15°C to 35°C
Accuracy Error
Typical (°C),
15°C to 35°C
Accuracy Error
Maximum (°C),
0°C to 45°C
Accuracy Error
Typical (°C),
0°C to 45°C
T
–200
2.005
0.923
2.207
1.005
0
0.836
0.382
0.874
0.400
400
0.544
0.255
0.659
0.297
N
–200
2.255
1.038
2.481
1.134
0
0.908
0.415
0.949
0.437
1300
0.718
0.357
1.157
0.510
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
Table 5. Digital input specifications
Parameter
Specification
Number of inputs
8 channels
Configuration
Fixed input
Input voltage range
0 V to +15 V
Input type
CMOS (Schmitt trigger)
Input characteristics
100
kΩ pull-up resistor, 28.7 kΩ series resistor
Maximum input voltage range
0 V to +20 V max (power on/off, relative to IGND pins)
Pull-up configuration
All pins pulled up to +5
V via individual 100 kΩ resistors using slide switch SW5.
SW5 default positions are on (pulled up.)
Transfer rate (software paced)
500 port reads per second typ.
Input high voltage
1.3 V min, 2.2 V max
Input low voltage
1.5 V max, 0.6 V min
Schmitt trigger hysteresis
0.4 V min, 1.2 V max
Table 6. Digital output specifications
Parameter
Specification
Number of outputs
32 channels, shared with alarms
Configuration
Open drain output
Output characteristics
100
kΩ pull-up, open drain (DMOS transistor)
Pull-up configuration
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.)
Transfer rate (software-paced)
Digital output – 500 port writes per second typ.
Output voltage range
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)
Off state leakage current
0.1 µA
Sink current capability
100 mA max (continuous) per output pin
DMOS transistor on-resistance
(drain to source)
4
Ω
Note 5:
Ground pins labeled IGND are isolated from AGND and chassis ground.
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