Vo Power Source - Measurement Computing USB-231-OEM User Manual

USB-231-OEM User's Guide
To use the LED signal to monitor the device state, refer to the circuit in Figure 9.

+VO power source

Figure 10 shows the
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The main blocks featured in the
—Regulated 5 V supply.
 +5 V Source
—Circuit for overvoltage, over current, and short circuit protection.
 +5 V Protection
The +5 V source is limited at 200 mA typically. In case of hard short circuit to ground, this limit is further
reduced to avoid excessive power dissipation.
Connecting the load
The return connector for the +5 V source is the
the connector and
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from the USB connector. To meet the USB specifications, a maximum of 150 mA can be used from the
connector.
Figure 9. Circuit to monitor device state with LED signal
power source circuitry of the USB-231-OEM.
Figure 10. +VO power source circuitry
power source circuitry are as follows:
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GND
. The current delivered by the USB-231-OEM at the
GND
connector. The +5 V load should be connected between
17
Functional Details
connector is sourced
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