Measurement-computing USB-231 Manual do Utilizador descarregar pdf (Página 25)

USB-231 User's Guide Specifications

Memory

Table 8 Memory specifications

Parameter Specification

Data FIFO 2,047 samples (4096 bytes)

Non-volatile memory  Up to 256 kB microcontroller integrated Flash

 2 kB microcontroller integrated EEPROM)

Power requirements

Table 9. Power specifications

Parameter Specification

From USB 4.50 to 5.25 VDC (Note 2)

Idle USB current 165 mA

Maximum load USB current <500 mA (Note 3)

Note 2: A typical bus-powered hub provides 100 mA on its USB lines. The USB-231 does not work on a bus-

powered hub.

Note 3: The maximum power draw from all output terminals should be kept under 0.9 W to avoid overloading

the USB port

Power output

Table 10. External voltage specifications

Parameter Specification

Output voltage

5 V, ±3%

Maximum current 150 mA

Overcurrent protection 200 mA

Short circuit current 50 mA

Overvoltage protection

±20 V

USB specifications

Table 11. USB specifications

Parameter Specification

Device type USB 2.0 full speed (12 Mb/s)

Device compatibility USB 1.1, USB 2.0

Connector type USB micro-B receptacle

USB cable type A-micro-B cable, UL type AWM 2725 or equivalent (28 AWG × 2C + 28 AWG × 2C +

AB)

USB cable length 3 m (9.84 ft) max

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