CH455G is the smallest digital tube display driver and keyboard scanning control chip currently launched by Qinheng, and the package is SOP-16_150mil. CH455G has a built-in clock oscillation circuit, which can dynamically drive 4-digit digital tubes or 32 LEDs; at the same time, it can also perform 28-key keyboard scanning; CH455G exchanges data with a single-chip microcomputer through the IIC serial interface composed of SCL and SDA. If the configuration related register is set to 7-segment mode, SEG7 (decimal point) can be configured as an active low-level keyboard interrupt, providing a key release flag for querying the key press and release.

Features:

● Built-in display current driver stage, the segment current is not less than 25mA, and the word current is not less than 160mA.

● Dynamic display scan control, support 8×4 or 7×4, directly drive 4 digital tubes or 32 LEDs.

● Internal current limiting, providing 8-level brightness control through duty cycle setting.

● Built-in 28-key keyboard controller, based on 7×4 matrix keyboard scanning.

● Built-in pull-down resistor for key state input, built-in debounce circuit.

● Provides a low-level active keyboard interrupt, and provides a key release flag, which can be used to query the key press and release.

● High-speed 2-wire serial interface, clock speed from 0 to 4MHz, compatible with two-wire I2C bus, saving pins.

● Built-in power-on reset, support 2.7V ~ 5V power supply voltage.

● Supports low-power sleep, saves power, and can be woken up by a button or a command operation.

● Built-in clock oscillation circuit, no need to provide external clock or external oscillation components, more anti-interference.