Z-World Wildcat BL2000 User Manual - page 21

User’s Manual

17

Figure 7(c).  Example of Logic Gate Driving BL2000 Digital Input

The actual switching threshold is approximately 2.40 V for channels IN0–IN10. Anything 

below this value is a logic 0, and anything above is a logic 1

.

The A/D converter inputs can be used as additional digital inputs using the parameters 

specified for the 

digIn

 software function call. The default threshold for channels IN11–

IN21 is also set to 2.40 V, but may be changed by adding two lines to your program as dis-

cussed for the 

digIn

 software function call.

The digital inputs are each fully protected over a range of -36 V to +36 V, and can handle 

short spikes of ±40 V.

Figure 8.  BL2000 Digital Input Protected Range

JP6

10 nF

22 k

W

27 k

W

Rabbit 2000™

Microprocessor

Vcc

1

3

JP6

+40 V

+36 V

+3.3 V

–40 V

Normal Switching

Levels

Spikes

Digital Input V

oltage

Spikes

Spikes