Keypad compatible with Pace medical IncKeypad compatible with Pace medical Inc Parameter Why It Matters Connector type & pinout The physical interface (ribbon cable, flex cable, discrete wires, etc.) and pin assignments (power, data lines, ground) must match the device Electrical specs Voltage levels (e. g. 3. 3V, 5V, or others), current draw, logic levels (TTL, CMOS, etc.) Key scanning matrix layout Number of keys, arrangement, whether it uses multiplexed scanning or direct wiring