Measurement Computing USB-4301 - Manual (Page 23)

USB-4301 User's Guide Specifications
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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.