The EDE1144 is a 4x4 matrix keypad encoder IC which has auto key repeat, contact debouncing, keybeep feedback, electrically quiet (reduced EMI) keypad scanning, serial/parallel output, data valid output signal for interrupt activation, 2400/9600 serial baud rates, 18 pin DIP or SOIC package, interfaces to any microcontroller or microprocessor, cost effective for OEM applications.
The EDE1144 is a 4 × 4 matrix keypad encoder IC that provides both serial (RS‑232) and parallel data outputs, a data‑valid interrupt signal, and a beeper for tactile feedback. It supports automatic key repeat, contact debouncing, and low‑EMI operation, reducing host MCU pin count to a single serial line or four parallel lines.
The document includes pin definitions, wiring diagrams, electrical ratings, operating conditions, and application notes for connecting the IC to keypads of various sizes, as well as guidelines for the beeper driver and RS‑232 level conversion.
| Typical current draw | 1.8 mA |
|---|---|
| Operating temperature range | 0 °C to +70 °C |
| Baud rates | 2400 bps or 9600 bps |
| Package options | 18‑pin DIP or SOIC |
| Beeper pulse duration | 45 ms |
It supports 2400 bps or 9600 bps serial communication.
The beeper generates a 1 kHz square‑wave pulse lasting 45 ms.
Typical current draw is about 1.8 mA.