Measurement Computing USB-5201, Руководство пользователя

Страница: 26 / 30

USB-5201 User's Guide Specifications
26
Real time clock
Table 10. Real time clock specifications
Battery backup CR-2032 lithium coin cell, replaceable
Accuracy ±1 minute per month
USB +5V voltage
Table 11. USB +5V voltage specifications
Parameter Conditions Specification
USB +5V (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 8) Continuous mode 500 mA max.
User +5V output voltage range
(terminal block pin 21 and 47) Connected to a self-powered hub. (Note 9) 4.75 V min. to
5.25 V max.
User +5V output current
(terminal block pin 21 and pin 47) Connected to a self-powered hub. (Note 9) 10 mA max.
Isolation Measurement system to PC 500 VDC min.
AC Adapter Power Supply (used for data logging operation)
Output voltage 5V ±5%
Output wattage 2.5 W
Input voltage 100 – 240 VAC
50 – 60 Hz
Input current 0.2 A
Note 8: This is the total current requirement for the device which includes up to 10 mA for the status
LED.
Note 9: 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'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.