Microcontroller; Indicator Leds; Power - Measurement Computing USB-7204 User Manual

USB-7204 User's Guide

Microcontroller

Parameter
Type
Program Memory
Data Memory

Indicator LEDs

Parameter
Power LED (top)
Status LED
OEM power

Power

Parameter
Supply current (Note 10)
+5V power available
USER
(Note 11)
Output current (Note 12)
Fuse F1, (F4 spare)
Fuse F2, (F3 spare)
This is the total current requirement for the USB-7204 which includes up to 10 mA for the status
Note 10:
LED.
Self-powered hub refers to a USB hub with an external power supply. Self-powered hubs allow a
Note 11:
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.
This refers to the total amount of current that can be sourced from the USB +5 V, analog outputs
Note 12:
and digital outputs.
Table 16. Microcontroller specifications
Specification
High performance 8-bit RISC microcontroller
32,768 words
3,936 bytes
Table 17. Indicator LED specifications
Specification
Indicates that the device's microcontroller has power and is configured.
Blinks to indicate USB communications.
OEM Connector; LED sink current up to 5 mA per LED @ 5 V
Table 18. Power specifications
Conditions
 Connected to self-powered hub
 Connected to externally-powered root port hub
Connected to bus-powered hub
Connected to self-powered hub
Connected to externally-powered root port hub
Connected to bus-powered hub
– Littelfuse 0.5A NANO
0452.500
– Littelfuse 0.375A NANO
0452.375
26
max
Specification
80 mA
4.0 V min, 5.25 V max
4.0 V min, 5.25 V max
420 mA max
20 mA max
2® ®
Slo-Blo Subminiature Surface Mount Fuse
2® ®
Slo-Blo Subminiature Surface Mount Fuse
Specifications