Retinatronics I2C keypad interface
RETINATRONICS I2C keypad interface is a very simple way of integrating 4×4 matrix keypad to a project with minimum hardware connections.
Support both 100 kHz and 400 kHz I2C speeds.
20 level First in first out buffer to hold the key presses.
Key press buffer overflow detect.
Supports up to 16 keys connected in matrix style.
Key down detect.
4 changeable I2C addresses via jumpers.
Wide operating voltage range from 1.8 V-5.5 V.
Size 36mm x 36mm.