CH32X033 is a low-cost microcontroller that utilizes the QingKe 32-bit RISC-V4C core, supporting the RV32IMAC instruction set along with self-extending instructions. This microcontroller comes with a built-in USB PHY and supports USB2.0 full-speed device functions. It features a programmable protocol I/O controller (PIOC), 2 groups of operational amplifiers (OPA), 2 groups of analog comparators (CMP), 4 groups of USART, I2C, SPI, multiple timers, a 12-bit ADC, a 10-channel Touchkey, and various other peripheral resources. The device can operate at clock frequencies of up to 48MHz and is compatible with a supply voltage range of 2.0V to 5.5V. The CH32X033 includes 62KB of flash, 20KB of SRAM, and an embedded USB bootloader.