NCV7750GEVB
5
This screen indicates NCV7750 is in the “Ready” state
and may now accept SPI commands. To program an SPI
command, use the rightmost two DIP switches to program
the four channels. Each channel has two bits. A table
describing the meaning of the bit pairs is below:
Table 1. SPI INPUT
Bit pair
Meaning
00
Channel stand
−
by mode
Fast channel turn off
Fault reset – if a fault occurs on this channel (Over Current, Over Temperature, Open Load), then the channel must be
sent a 00 through SPI before it is turned on again through SPI
01
Input mode
Channel accepts input through the IN1
−
IN4 inputs, akin to LHI mode
10
Channel turned on
11
Channel turned off
Figure 7. Channel Configuration DIP Switches
After setting the DIP switches to the desired input, the
transmit button may be pressed. SPI transmission is very fast
so the “Done” status should pop up almost immediately. At
this point the user may release the transmit button so another
SPI transmission may be setup.
Figure 8.
Alternatively, the user can enable continuous input using
the toggle switch labelled “continuous transmission” which
is the leftmost one. Continuous input is not a feature of the
NCV7750, but rather the Arduino is programmed to simply
not wait for the user to press the transmit button in this mode.
As a result, the NCV7750 will respond practically
immediately to any change in user input on the DIP
switches.
Figure 9.
