Stealing or keeping valuables safe number keypad stock videos & royalty-free footage 00:19 Hand punches code to open and lock security deposit box or safe... Close up hand pushing buttons to open and ...

Numeric keypads are available with a range of functions and keys. Read on for the best numeric keypad for you and your needs.

As you said, customer keypad is 84keys. So I think I would like to consider LM8330 instead of TCA8148E. The matrix scheme will be as below. This is just my idea. And the block diagram will be as below ...