The CMS89F2385B is a RoHS compliant system-on-chip (SoC) microcontroller unit (MCU) manufactured by Cmsemicon. This MCU is housed in a plastic surface-mount packaging with an SOP-28-300mil form factor. It is specifically designed for higher-level microcontroller applications with an 8-bit microcontroller core.The CMS89F2385B features on-chip peripherals such as an 8-channel digital-to-analog converter (DAC) and enhanced SPI bus. It also offers a high-speed USB 2.0 host interface, various DMA channels, and an external bus interface (EBI) for accessing external memory. This MCU has a maximum clock speed of 20 MHz and a wide power supply voltage range of 1.8V to 5.5V. It has 4KB of SRAM, 256KB of on-chip Flash memory, and an analog temperature sensor. Its on-chip debug system supports a JTAG interface and a serial programming algorithm for in-circuit software and firmware testing and debugging.