company blog about Supply Silicon Labs EFM8BB21F16G-C-QFN20R — EFM8 Busy Bee Series 8-bit High-Performance Microcontroller

Shenzhen Mingjiada Electronics Co., Ltd. is now offering genuine, in-stock supply of the Silicon Labs EFM8BB21F16G-C-QFN20R 8-bit microcontroller (MCU), backed by a guarantee of authentic factory-direct products, direct access to massive inventory, and rapid delivery.

Product Highlights: EFM8BB21F16G-C-QFN20R 8-bit MCU

The EFM8BB21F16G-C-QFN20R is a high-performance 8-bit microcontroller from Silicon Labs’ EFM8 Busy Bee series, based on an advanced C8051 core with a clock speed of up to 25 MHz. This MCU integrates a rich set of analog and digital peripherals and is housed in an ultra-compact QFN20 package. Featuring ultra-low power consumption, a high-precision ADC, and multiple communication interfaces, it is an ideal choice for space-constrained applications such as battery-powered devices, sensor nodes, and motor control.

EFM8BB21F16G-C-QFN20R Key Specifications

Product Model: EFM8BB21F16G-C-QFN20R

Manufacturer: Silicon Labs

Product Series: EFM8 Busy Bee (BB2 Series)

Core Architecture: C8051 8-bit MCU, pipelined instruction set

Maximum Clock Speed: 25MHz (internal oscillator)

Flash Capacity: 16KB

RAM Capacity: 2KB

Data Flash: 512B

Package Type: QFN-20 (3mm × 3mm)

Temperature Grade: Commercial Grade (C) –40°C to +85°C

Operating Voltage: 1.8V to 3.6V (typically 2.0V to 3.3V)

I/O Pins: 17 general-purpose I/O pins

ADC: 12-bit SAR ADC, 16 channels, 500 ksps

DAC: 2 x 12-bit DACs

Comparators: 2 analog comparators

Timers: 4 x 16-bit timers/counters

PWM: 4-channel configurable PWM

Communication Interfaces: 2×UART, 1×SPI, 1×I²C, 1×SMBus

CRC Hardware: Supports CRC-8/CRC-16 hardware acceleration

Watchdog: Programmable watchdog timer

Debug Interface: C2 debug interface (2-wire)

Power Consumption: 150 μA/MHz in active mode, <1 μA in sleep mode

EFM8BB21F16G-C-QFN20R Key Features

High-performance C8051 core: 25 MHz clock frequency, single-cycle instruction execution, up to 25 MIPS processing capability

Ultra-low power design: Multiple power-saving modes, sleep current <1 μA, suitable for battery-powered applications

High-precision analog peripherals: 12-bit ADC (500 ksps) + 2 x 12-bit DACs + 2 comparators

Rich Communication Interfaces: Dual UART, SPI, I²C, and SMBus to meet diverse connectivity needs

Ultra-compact Package: 3mm × 3mm QFN20, saving PCB space

Wide operating voltage: 1.8V–3.6V wide-voltage supply, compatible with various power systems

Hardware CRC: Built-in CRC-8/CRC-16 hardware acceleration, reducing CPU load

Flexible clock system: Internal 24.5MHz oscillator (±2% accuracy) + external crystal oscillator support

Security features: Programmable watchdog, under-voltage detection, Flash security lock

EFM8BB21F16G-C-QFN20R Pin Configuration (QFN-20)

GPIO: 17 channels Configurable as input/output, supports pull-up/pull-down

Analog Inputs: 16 channels Connected to 12-bit SAR ADC

DAC Outputs: 2 channels 12-bit DAC analog outputs

UART: 2 channels Asynchronous serial ports, supports hardware flow control

SPI: 1 channel Synchronous Serial Peripheral Interface

I²C/SMBus: 1 channel I²C master/slave mode, SMBus compatible

Debug Interface: 2-wire C2CK (clock), C2D (data)

Power Pins: Multiple VDD, GND, decoupling capacitor connections

EFM8BB21F16G-C-QFN20R Key Application Scenarios

With its high performance, low power consumption, and small package size, the EFM8BB21F16G-C-QFN20R is widely used in various fields, including but not limited to: industrial control (PLCs, industrial sensors, motor controllers), consumer electronics (smart home devices, wearables, smart bracelets) , medical devices (portable medical monitors, sensor controllers), communication systems (base station equipment, optical modules, high-speed communication hubs), lighting systems, and battery-powered devices, making it suitable for a wide range of mid-to-low-end embedded control applications.

Contact Us

We currently have ample stock of the EFM8BB21F16G-C-QFN20R—available on a first-come, first-served basis! To obtain a quote for the Silan Microelectronics EFM8BB21F16G-C-QFN20R 8-bit microcontroller, please contact the Mingjiada Electronics sales team.