EFM8BB21F16I-C-QFN20R | Silicon Labs EFM8 Busy Bee 8-bit MCU

One-sentence summary

High-performance 8-bit microcontroller with pipelined C8051 core in compact QFN20 package. It integrates a 12-bit ADC plus I2C/SPI/UART interfaces, ideal for IMU sensor data acquisition, motor control and small embedded host controller applications.

✅ Key Specifications

Brand: Silicon LabsSuffix definition: I = temperature grade -40~85℃; C = C2 debug interface; QFN20 = 20-pin QFN; R = tape-and-reel packagingCore: Pipelined CIP-51 (enhanced 8051), maximum operating frequency 50 MHzFlash: 16 KB; RAM: 2.25 KBPackage: QFN20, 3.0 × 3.0 mm, with exposed pad on bottomSupply voltage: 2.2 V ~ 3.6 VOperating temperature: -40℃ ~ +85℃ (general industrial grade, non-automotive)Analog peripherals: 12-bit ADC with 15 external analog channels; 2 integrated analog comparators, on-chip temperature sensorDigital peripherals:2 × UART, 1 × SPI, 1 × I2C (SMBus)5 × 16-bit general-purpose timers; 3 PCA channels (configurable for PWM output)IO features: 5V-tolerant IO pins, crossbar for flexible peripheral pin assignmentDebug: 2-wire C2 in-circuit debug, supports on-chip programming and debugging