The MAX7359 is a key controller from MAXIM for portable consumer electronic products, supporting 64 switches and auto sleep and auto wake features.
The MAX7359 provides micro‑processor interfaces for managing up to 64 key switches with static matrix monitoring to ensure low‑EMI operation. It generates key‑press and release codes, supports optional autorepeat, and includes a 16‑byte FIFO for event storage. The device features autosleep and autowake to minimize power consumption, with a typical sleep‑mode current of 0.6 µA.
The part is offered in a 24‑pin TQFN or 25‑pin WLP package for portable consumer electronics. It uses a 2‑wire I²C‑compatible serial interface (SDA, SCL, ADO) and provides up to seven open‑drain logic outputs that can drive LEDs. Detailed pin descriptions, electrical characteristics, and timing specifications are provided for system integration.
| Operating Supply Voltage | 1.62 V to 3.6 V |
|---|---|
| Sleep‑Mode Supply Current (typ) | 0.6 µA |
| Key‑Switch Source Current | 20 µA to 35 µA |
| FIFO Depth | 16 debounced key events |
| Package Options | 24‑pin TQFN (3.5 mm × 3.5 mm) or 25‑bump WLP (2.31 mm × 2.31 mm) |
The typical sleep‑mode current is 0.6 µA.
It uses a 2‑wire I²C‑compatible serial interface (SDA, SCL, ADO).
Yes, if the INT pin is not needed for interrupts it can be configured as an open‑drain GPO.