Measurement-computing USB-4301 Manuel d'utilisateur télécharger pdf (Page 23)

USB-4301 User's Guide Specifications

Memory

Table 4. Memory specifications

EEPROM

256 bytes EEPROM memory available for external use.

Microcontroller

Table 5. Microcontroller specifications

Type

High performance 8-bit RISC microcontroller

USB +5V voltage

Table 6. USB +5V voltage specifications

Parameter

Conditions

Specification

USB +5V (VBUS) input voltage range

4.75 V min. to 5.25 V max.

LEDs

Table 7. USB +5V voltage specifications

Power LED

Indicates that the device’s microcontroller has power and is running

Status LED

Indicates that the USB is configured; blinks to indicate USB traffic.

Power

Table 8. Power specifications

Parameter

Conditions

Specification

Supply current (Note 3)

USB enumeration

100 mA max

Supply current

Maximum load

302 mA max.

User +5V output voltage range

(terminal block pin 8 and 18)

Connected to self-powered hub. (Note 4)

4.75 V min. to

5.25 V max.

User +5V output current

(terminal block pin 8 and pin 18)

Bus-powered and connected to a self-powered

hub. (Note 4)

10 mA max.

Note 3: This is the total current requirement for the USB-4301 which includes up to 14 mA for the Power

and Status LEDs, but does not include current sourced from the User +5V output or from the

digital output pins.

Note 4: Self-Powered Hub refers to a USB hub with an external power supply. Self-powered hubs allow

a connected USB device to draw up to 500 mA.

Root Port Hubs reside in the PC’s USB Host Controller. The USB port(s) on your PC are root

port hubs. All externally powered root port hubs (desktop PC’s) provide up to 500 mA of current

for a USB device. Battery-powered root port hubs provide 100 mA or 500 mA, depending upon

the manufacturer. A laptop PC that is not connected to an external power adapter is an example

of a battery-powered root port hub.

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Measurement-computing USB-4301 Manuel d'utilisateur Page 23

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