Keyboard Scanning Controller IC CH452A Axis Electronics

Description

The CH452A is a LED display driver and keyboard scanning controller IC in a SOP-28 (300 mil) surface-mount package, designed to drive multiplexed LED displays and scan key matrices for embedded systems. It supports dynamic scanning of up to 8 digits or 64 LEDs, and integrates display control and keyboard input scanning to simplify designs and reduce microcontroller I/O requirements.

FEATURES

Supply Voltage: ~2.7 V to 5.5 V (usable with 3.3 V and 5 V systems).
Operating Temperature: −40 °C to +85 °C.
Output Current Driving: ~20 mA; Word / ~100 mA typical.
Serial Interface: CLK/DIN/DOUT/LOAD
Supports RoHS: Lead-free
Display Driver + Keyboard Scanner — Combines LED driving with key matrix scanning.
Supports Common-Cathode & Common-Anode Displays.
Interface: Serial interface (commonly 4-wire SPI style).
Adjustable Brightness & Blinking Control.
Dynamic Scan Up to 8×8 LEDs or 8 digits.
Key Matrix Scanning: Up to 64 keys, with built-in debounce logic.
Selectable BCD decoding or direct segment control.
Internal Oscillator & Scan Control Logic.
Mounting Style: Surface Mount