CH450H

CH450 is a digital tube display driver and keyboard scan controller IC. It features a built-in clock oscillator circuit, capable of dynamically driving 6-digit numeric displays or 48 LEDs, while also supporting 48-key keyboard scanning. It communicates with MCUs via a 2-wire serial interface and provides a power-on reset signal to the MCU.

Applications

• Seven-segment display driver

Key features

• Built-in display current drive stage, segment current ≥15mA, digit current ≥80mA.
• Dynamic display scan control, directly drives 6-digit nixie tubes or 48 LEDs.
• Built-in 48-key keyboard controller, based on 8×6 matrix keyboard scan.
• Built-in pull-down resistors for key state input, with integrated debounce circuit.
• High-speed 2-wire serial interface, clock speed from 0 to 2MHz, compatible with I²C bus, pin-saving.
• Built-in clock oscillator circuit, no external clock or oscillator components required, improved noise immunity.
• Built-in power-on reset, provides active-high reset output for MCU.
• Low-power sleep mode support for energy saving, wake-up via keypress or command.
• Available in DIP20 and SOP20 lead-free packages, RoHS compliant, partially pin and function compatible with CH455.