Power – Measurement Computing USB-7204 User Manual
Page 26
USB-7204 User's Guide
Specifications
26
Power
Table 18. Power specifications
Parameter
Conditions
Specification
Supply current (Note 10)
80 mA
+5V
USER
power available
(Note 11)
Connected to self-powered hub
Connected to externally-powered root port hub
4.0 V min, 5.25 V max
Connected to bus-powered hub
4.0 V min, 5.25 V max
Output current (Note 12)
Connected to self-powered hub
Connected to externally-powered root port hub
420 mA max
Connected to bus-powered hub
20 mA max
Fuse F1, (F4 spare)
– Littelfuse 0.5A NANO
2®
Slo-Blo
®
Subminiature Surface Mount Fuse
Fuse F2, (F3 spare)
– Littelfuse 0.375A NANO
2®
Slo-Blo
®
Subminiature Surface Mount Fuse
Note 10:
This is the total current requirement for the USB-7204 which includes up to 10 mA for the status
LED.
Note 11:
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 computer's USB host controller. The USB port(s) on your computer are
root port hubs. All externally powered root port hubs (desktop computers) 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 computer that is not connected to an external power adapter is an example
of a battery-powered root port hub.
Bus powered hubs receive power from a self-powered or root port hub. In this case the max current
available from the USB +5 V is 100 mA. The minimum USB +5 V voltage level can be as low as
4.1 V.
Protected by fuse F2 at 375 mA.
Note 12:
This refers to the total amount of current that can be sourced from the USB +5 V, analog outputs
and digital outputs.