Measurement Computing USB-5201 - Manual (Page 23)

USB-5201 User's Guide Specifications
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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.