WCH CH32V003 is a new ultra-cheap RISC-V microcontroller (MCU) clocked at 48 MHz with 2KB SRAM, 16KB flash, and a bunch of interfaces that sells for under 10 cents in quantities.

The MCU offers up to eighteen GPIOs, UART, SPI, I2C, an 8-channel 10-bit ADC, and several timers in TSSOP20, QFN20, SOP16, or SOP8 packages, and a small development board is also available.

WCH CH32V003 specifications:

CPU – 32-bit “RISC-V2A” core up to 48 MHz Memory – 2KB SRAM Storage – 16KB flash Peripherals Up to 18x GPIO with interrupt support 1x USART interface 1x I2C 1x SPI 10-bit ADC up to 8 channels 1-Wire debug interface General purpose DMA controller Timers 16-bit advanced timer 16-bit general-purpose timer 2x watchdog timers 32-bit system timer Misc – 64-bit chip unique ID Supply voltage – 3.3/5V Low power modes – Sleep, standby Power on Reset (POR), programmable voltage detector Packages – TSSOP20, QFN20, SOP16, SOP8 Four parts are now available with CH32V003F4P6, CH32V003F4U6, CH32V003A4M6, and CH32V003J4M6 with most of the same specifications except for a different number of GPIOs and different packages.

Packing List: CH32V003F4P6 TSSOP20 IC*5