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USB-TC-AI User's Guide Specifications
20
Temperature alarms
Table 12. Temperature alarm specifications
Parameter
Specification
Number of alarms
8 (one per digital I/O line)
Alarm functionality
Each alarm controls its associated digital I/O line as an alarm output. The input to each
alarm may be any of the analog temperature input channels. When an alarm is enabled, its
associated I/O line is set to output (after the device is reset) and driven to the appropriate
state determined by the alarm options and input temperature. The alarm configurations are
stored in non-volatile memory and are loaded at power on. Alarms will function both in
data logging mode and while attached to USB.
Alarm input modes
Alarm when input temperature > T1
Alarm when input temperature > T1, reset alarm when input temperature goes below T2
Alarm when input temperature < T1
Alarm when input temperature < T1, reset alarm when input temperature goes above T2
Alarm when input temperature is < T1 or > T2
Note: T1 and T2 may be independently set for each alarm.
Alarm output modes
Disabled, digital I/O line may be used for normal operation
Enabled, active high output (digital I/O line goes high when alarm conditions met)
Enabled, active low output (digital I/O line goes low when alarm conditions met)
Alarm update rate
1 second
Counter
Table 13. CTR I/O specifications
Parameter
Specification
Pin name
CTR
Number of channels
1
Resolution
32-bits
Counter type
Event counter
Input type
TTL, rising edge triggered
Input source
CTR screw terminal
Counter read/writes rates
(software paced)
Counter read: system dependent, 33 to 1000 reads per second.
Counter write: system dependent, 33 to 1000 reads per second.
Schmidt trigger hysteresis
20 mV to 100 mV
Input leakage current
±1.0 µA typ
Input frequency
1 MHz max
High pulse width
500 nS min
Low pulse width
500 ns min
Input high voltage
4.0 V min, 5.5 V absolute max
Input low voltage
1.0 V max, –0.5 V absolute min
Note 13: All ground pins are common and are isolated from earth ground. If a connection is made to earth
ground with both the counter (CTR) and conductive thermocouples, the thermocouples are no longer
isolated. In this case, thermocouples must not be connected to any conductive surfaces that may be
referenced to earth ground.
Memory
Table 14. Memory specifications
Parameter
Specification
EEPROM
1,024 bytes isolated micro reserved for sensor configuration
256 bytes USB micro for external application use
- User's Guide 1
- HM USB-TC-AI.docx 2
- Table of Contents 3
- About this User’s Guide 5
- Introducing the USB-TC-AI 6
- Installing the USB-TC-AI 8
- Configuring the hardware 9
- Calibrating the hardware 9
- Signal I/O Connections 10
- Thermocouple connections 11
- Digital I/O connections 12
- Functional Details 13
- External components 14
- Specifications 15
- Channel configurations 16
- Accuracy 17
- Absolute accuracy: V0x-V3x 18
- Settling time: V0x-V3x 18
- Analog input calibration 19
- Throughput rate 19
- Digital I/O 19
- Temperature alarms 20
- Counter 20
- Microcontroller 21
- USB +5V voltage 21
- USB specifications 21
- Environmental 21
- Mechanical 22
- Screw terminal connector 22
- Declaration of Conformity 23
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