CH32V003 series is based on the QingKe RISC-V2A core design of industrial-grade general-purpose microcontroller, support 48MHz system main frequency, with wide voltage, 1-wire SDI, low-power consumption, ultra-small package, etc. CH32V003 series built-in a group of DMA controller, a group of 10-bit ADC, a group of OPA, multiple timers and standard communication interfaces USART, IC, SPI, etc. Features: QingKe 32-bit RISC-V2A processor with 2-level interrupt nesting support Up to 48MHz system main frequency 2KB SRAM, 16KB Flash Power supply voltage: 3.3/5V Multiple low-power modes: Sleep, Standby Power up/down reset, programmable voltage detector 1 group of 1-channel general-purpose DMA controller 1 group of OPA 1 group 10-bit ADC 1 16-bit advanced-control timer and 1 16-bit general-purpose timer 2 watchdog timers and 1 32-bit SysTick timer 1 USART interface, 1 group of IC interface, 1 group of SPI interface 18 I/O ports, mapping an external interrupt 64-bit chip unique ID 1-wire serial debug interface(SDI)