CH554 is a compatible MCS51 enhanced E8051 core microcontroller, 79% of the instruction is a single byte single cycle instruction, built-in 24MHz clock source, built-in 1K + 256B RAM, 16KB iFlash-ROM. CH554 provides a wealth of interface resources, including ADC analog-to-digital conversion, 3 sets of timer and signal capture and PWM, dual asynchronous serial port, SPI and so on.
CH554 provides 6-channel capacitive detection module, mutual capacitance mode supports up to 15 touch buttons.
CH554 embedded full-speed USB controller, support USB HOST mode and USB DEVICE mode.
Похоже новые, судя по дате самой первой версии даташита - 2016