Measurement-computing USB-TC Manual do Utilizador descarregar pdf (Página 17)

USB-TC User's Guide Specifications

Note 6: The analog inputs are configured to run continuously. Each channel is sampled twice per second.

The maximum latency between when a sample is acquired and the temperature data is provided by

the USB unit is approximately 0.5 seconds.

Digital input/output

Table 5. Digital input/output specifications

Parameter

Specification

Digital type

CMOS

Number of I/O

8 (DIO0 through DIO7)

Configuration

Independently configured for input or output.

Power on reset is input mode.

Pull-up/pull-down configuration

All pins pulled up to +5 V via 47 K resistors (default). Pull-down to ground (GND)

also available.

Digital I/O transfer rate

(software paced)

 Digital input: 50 port reads or single bit reads per second, typ

 Digital output: 100 port writes or single bit writes per second, typ

Input high voltage

2.0 V min, 5.5 V absolute max

Input low voltage

0.8 V max, –0.5 V absolute min

Output low voltage

(IOL = 2.5 mA)

0.7 V max

Output high voltage

(IOH = –2.5 mA)

3.8 V min

Note 7: All ground pins are isolated from earth ground. If a connection is made to earth ground when using

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.

Memory

Table 6. Memory specifications

Parameter

Specification

EEPROM

1,024 bytes isolated micro reserved for sensor configuration

256 bytes USB micro for external application use

Microcontroller

Table 7. Microcontroller specifications

Parameter

Specification

Type

Two high performance 8-bit RISC microcontrollers

USB +5V voltage

Table 8. USB +5V voltage specifications

Parameter

Specification

USB +5V (VBUS) input

voltage range

4.75 V min to 5.25 V max

1 2 ... 12 13 14 15 16 17 18 19 20 21

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