The HW-044 is a compact, pre-assembled module designed to drive common-cathode LED displays. Its core component is the integrated circuit from Maxim Integrated (now Analog Devices). The module allows microcontrollers (e.g., Arduino, ESP32, STM32) to control up to 64 individual LEDs (8 digits of 7-segments plus decimal points, or an 8x8 dot matrix) using only three I/O pins .
The HW-044 module allows you to configure the amplifier gain and audio channel selection by connecting the and SD_MODE pins to either VIN, GND, or leaving them floating. hw-044 datasheet