16-digit digital tube driver and keyboard control chip CH456


The CH456 is a 16-bit digital tube display driver and keyboard scan control chip. The CH456 has a built-in clock oscillating circuit that can dynamically drive up to 16 digital tubes or 128 LED tubes; it can also perform 64-key keyboard scanning; CH456 exchanges data with a single-chip microcomputer through a 2-wire serial interface. The figure below shows the application block diagram of CH456.


  • Built-in display current drive stage, segment current is not less than 25mA, word current is not less than 150mA.
  • Dynamic display scan control, directly driving 16 digital tubes or 128 LEDs.
  • Internal current limit, multi-level brightness control is provided by duty cycle setting.
  • Built-in 64-key keyboard controller based on 8×8 matrix keyboard scan.
  • Active low-level keyboard interrupt, a button release flag is provided for querying the button to be pressed and released.
  • Some of the unused display driver pins X12 to X15 can be used as GPO general purpose output pins.
  • High-speed 2-wire serial interface with clock speeds from 0 to 2MHz, compatible with two-wire I2C bus, saving pins.
  • Built-in clock oscillating circuit, no need to provide external clock or external oscillating components, more anti-interference.
  • Support 3V, 3.3V, 5V power supply voltage.
  • Supports low-power sleep, saves power, can be woken up by a button or wake up by a command operation.
  • Available in four lead-free packages, DIP20, SOP20, DIP16 and SOP16, RoHS compliant.

relation files

file name file content
CH451DS1.PDF CH451 datasheet. CH451 can be used for 8×8 segment digital tube drive and 64-key keyboard scanning control, cascading 10MHz high-speed 4-wire interface to simplify the workload of MCU.
CH452DS1.PDF CH452 datasheet. CH452 can be used for 64 LEDs or 8×8 segment digital tube drive and 64-key keyboard scanning control, simplifying the workload of MCU.
CH453DS1.PDF CH453 datasheet. CH453 can be used for 128 LEDs or 16×8 segment digital tube drive and 64-key keyboard scanning control.
CH455DS1.PDF CH455 datasheet. CH455 can be used for 32 LEDs or 4 digital tubes drive, and 28-key keyboard and 3 combination keys scanning control.
CH454DS1.PDF CH454 datasheet. CH454 is used for display driver of 16-segment LED displays or 8 alphanumeric displays and for keyboard scan control, supports 17 segments x 7 digital tubes, 16 segments x 8 digital tubes and 8 segments x 16 digital tubes.
CH423DS1.PDF CH423 datasheet. A remote I/O expander with 2-wire serial interface, used for 16 digital tube display or I/O expansion applications through two wires. The input terminal is a two-wire interface compatible with I2C, and the output terminal is an 8-bit bidirectional input/output port and a 16-bit high-current output port.