Measurement-computing USB-5201 Manual de usuario descargar pdf (Pagina 23)

USB-5201 User's Guide Specifications

Real-time clock

Table 10. Real-time clock specifications

Parameter Specification

Battery backup CR-2032 lithium coin cell, replaceable

Accuracy ±1 minute per month

USB +5V voltage

Table 11. USB +5 V voltage specifications

Parameter Conditions Specification

USB +5 V (VBUS) input voltage range 4.75 V min to 5.25 V max

Power

Table 12. Power specifications

Parameter Conditions Specification

Connected to USB

Supply current USB enumeration <100 mA

Supply current (Note 2) Continuous mode 500 mA max

User +5 V output voltage range

(pins 21 and 47)

Connected to a self-powered hub. (Note 3) 4.75 V min to

5.25 V max

User +5 V output current

(pins 21 and 47)

Connected to a self-powered hub. (Note 3) 10 mA max

Isolation Measurement system to PC 500 VDC min

AC Adapter Power Supply (used for data logging operation)

Output voltage 5 V ±5%

Output wattage 2.5 W

Input voltage 100 – 240 VAC

50 – 60 Hz

Input current 0.2 A

Note 2: This is the total current requirement for the device which includes up to 10 mA for the status LED.

Note 3: 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. This device may not be used with bus-powered hubs due

to the power supply requirements.

Root port hubs reside in the PC USB host controller. The USB port(s) on your PC are root port hubs.

All externally powered root port hubs (desktop PCs) 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-5201 Manual de usuario Pagina 23