Microcontroller, Indicator leds, Power – Measurement Computing USB-7202 User Manual
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USB-7202 User's Guide
Specifications
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Microcontroller
Table 10. Microcontroller specifications
Parameter
Specification
Type
High performance 8-bit RISC microcontroller
Program memory
32,768 words
Data memory
3,936 bytes
Indicator LEDs
Table 11. Indicator LED specifications
Parameter
Specification
Power LED (top)
Indicates that the device’s microcontroller has power and is configured.
Status LED
Blinks to indicate USB communications.
OEM power
OEM Connector; LED sink current up to 5 mA per LED @ 5 Vmax
Power
Table 12. Power specifications
Parameter
Conditions
Specification
Supply current
USB enumeration
< 100 mA
Continuous mode
150 mA (Note 5)
+5VUSER power available
(Note 6)
Connected to self-powered hub
Connected to externally-powered root port hub
4.0 V min, 5.25 V max
Output current (Note 7)
350 mA max
Fuse F1, (F4 spare)
- Littelfuse 0.5A NANO2®
Slo-Blo®
Subminiature Surface Mount Fuse
Fuse F2, (F3 spare)
- Littelfuse 0.375A NANO2®
Slo-Blo®
Subminiature Surface Mount Fuse
Note 5:
This is the total current requirement for the USB-7202, which includes up to 10 mA for the status
LED.
Note 6:
"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 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. If your
laptop computer is constrained to the 100 mA maximum, you need to purchase a self-powered hub.
Note 7:
This is the total amount of current that can be sourced from the +5VUSER and digital outputs. Fuse for
+5V terminal is rated at 375 mA.