Measurement-computing USB-TEMP-AI Manual do Utilizador descarregar pdf (Página 26)

USB-TEMP-AI User's Guide Specifications

Note 19: All ground pins are common and are isolated from earth ground. If a connection is made to earth

ground when using both digital I/O 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.

Counter

Table 16. CTR I/O specifications

Parameter

Specification

Pin name

CTR

Number of channels

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 20: 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 17. Memory specifications

Parameter

Specification

EEPROM

1,024 bytes isolated micro reserved for sensor configuration

256 bytes USB micro for external application use

Microcontroller

Table 18. Microcontroller specifications

Parameter

Specification

Type

Two high-performance 8-bit RISC microcontrollers

USB +5V voltage

Table 19. USB +5V voltage specifications

Parameter

Specification

USB +5V (VBUS) input voltage

range

4.75 V min to 5.25 V max

1 2 ... 21 22 23 24 25 26 27 28 29 30

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