National Instruments USB-6001, Руководство пользователя

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6 | ni.com | NI USB-6001/6002/6003 OEM User Guide
To drive a status LED, refer to the circuit as shown in Figure 6.
Figure 6. To Drive a Status LED
To use the LED signal to monitor the device state, refer to the circuit as shown in Figure 7.
Figure 7. To Monitor Device State Through the LED Signal
Electrical Characteristics
Table 2 lists the LED electrical characteristics.
Table 2. LED Electrical Characteristics
Parameter Condition Typical Maximum
Output Low Voltage
I
OL
= 8 mA — 0.4 V
I
OL
= 18 mA 1.2 V —
External Pull-up Voltage — — 5.25 V
Maximum Sinking Current — — 18 mA
Rp u ll
LED
Vp u ll- u p (U s er-Provided, <=5.25 V)
LED S ign a l
NI U S B-6001/6002/600 3
LED S ign a l
NI U S B-6001/6002/600 3
Rp u ll
Vp u ll- u p (U s er-Provided, <=5.25 V)
Device
Monitoring
Circ u it