EFM8™ Busy Bee 8-bit Microcontrollers (MCUs)

The Busy Bee family of EFM8 Microcontrollers (MCUs) includes general purpose MCUs that operate at up to 50 MHz. These MCUs offer high-value by integrating advanced analog and communication peripherals into small packages, making them ideal for space constrained applications.

EFM8 Extended Temperature Busy Bee MCU NEW

Operating temperature from -40°C to 125°C in tiny 8-bit MCU

Features

  • Pipelined 8-bit C8051 core with up to 50 MHz maximum operating frequency
  • Up to 22 multifunction, 5 V tolerant I/O pins
  • One 12-bit Analog to Digital converter (ADC) with up to 20 channels
  • Two low-current analog comparators
  • Integrated temperature sensor
  • 3-channel enhanced PWM / PCA
  • Up to five 16-bit timers
  • UART, SPI and SMBus/I²C
  • Priority crossbar for flexible pin mapping

Getting Started with EFM8 Busy Bee

Busy Bee Starter Kits

The easiest way to begin development with the EFM8 Busy Bee family of MCUs including AEC-Q100 qualified devices is with one of three available starter kits.

View Starter Kits


Busy Bee Product Matrix

Common Specifications

MCU Core: 8051

USB: No

Cap Sense: No

Temp Sensor: Yes

PCA Channels: 3

Comparators: 2

SPI: 1

I2C: 1

VREF: Yes

Devices
Part Number Data Sheet Dev Kit MCU Core MHz Flash (kB) RAM (kB) Dig I/O Pins 5 Volt Tolerant ADC 1 USB Temp Sensor Timers (16-bit) PCA Channels DAC Comparators UART SPI I²C HS I²C Slave I²S EMIF CAN LIN AES AEC-Q100 Vdd (min) Vdd (max) Package Type Package Size (mm) Internal Osc. VREF Debug Interface Temperature Range (ºC)
SLSTK2020A 8051 25 2 0.25 16 Yes 12-bit, 15-ch. No Yes 4 3 2 1 1 1 0 0 0 0 0 No Yes 2.2 3.6 QFN20 3x3 ±2 Yes C2 -40 125
SLSTK2020A 8051 25 2 0.25 16 Yes 12-bit, 15-ch. No Yes 4 3 2 1 1 1 0 0 0 0 0 No Yes 2.2 3.6 QFN20 3x3 ±2 Yes C2 -40 85
SLSTK2020A 8051 25 2 0.25 16 Yes 12-bit, 15-ch. No Yes 4 3 2 1 1 1 0 0 0 0 0 No Yes 2.2 3.6 QFN20 3x3 ±2 Yes C2 -40 125
SLSTK2020A 8051 25 4 0.5 16 Yes 12-bit, 15-ch. No Yes 4 3 2 1 1 1 0 0 0 0 0 No Yes 2.2 3.6 QFN20 3x3 ±2 Yes C2 -40 125
SLSTK2020A 8051 25 4 0.5 16 Yes 12-bit, 15-ch. No Yes 4 3 2 1 1 1 0 0 0 0 0 No Yes 2.2 3.6 QFN20 3x3 ±2 Yes C2 -40 85
SLSTK2020A 8051 25 4 0.5 16 Yes 12-bit, 15-ch. No Yes 4 3 2 1 1 1 0 0 0 0 0 No Yes 2.2 3.6 QFN20 3x3 ±2 Yes C2 -40 125
SLSTK2020A 8051 25 8 0.5 16 Yes 12-bit, 15-ch. No Yes 4 3 2 1 1 1 0 0 0 0 0 No Yes 2.2 3.6 QFN20 3x3 ±2 Yes C2 -40 125
SLSTK2020A 8051 25 8 0.5 16 Yes 12-bit, 15-ch. No Yes 4 3 2 1 1 1 0 0 0 0 0 No Yes 2.2 3.6 QFN20 3x3 ±2 Yes C2 -40 85
SLSTK2020A 8051 25 8 0.5 18 Yes 12-bit, 16-ch. No Yes 4 3 2 1 1 1 0 0 0 0 0 No Yes 2.2 3.6 QSOP24 8.7x3.9 ±2 Yes C2 -40 85
SLSTK2020A 8051 25 8 0.5 13 Yes 12-bit, 12-ch. No Yes 4 3 2 1 1 1 0 0 0 0 0 No Yes 2.2 3.6 SOIC16 9.9x3.9 ±2 Yes C2 -40 85
SLSTK2020A 8051 25 8 0.5 16 Yes 12-bit, 15-ch. No Yes 4 3 2 1 1 1 0 0 0 0 0 No Yes 2.2 3.6 QFN20 3x3 ±2 Yes C2 -40 125
SLSTK2020A 8051 25 8 0.5 18 Yes 12-bit, 16-ch. No Yes 4 3 2 1 1 1 0 0 0 0 0 No Yes 2.2 3.6 QSOP24 8.7x3.9 ±2 Yes C2 -40 125
SLSTK2020A 8051 25 8 0.5 13 Yes 12-bit, 12-ch. No Yes 4 3 2 1 1 1 0 0 0 0 0 No Yes 2.2 3.6 SOIC16 9.9x3.9 ±2 Yes C2 -40 125
SLSTK2021A 8051 50 16 2.25 16 Yes 12-bit, 15-ch. No Yes 5 3 2 2 1 1 1 0 0 0 0 No Yes 2.2 3.6 QFN20 3x3 ±1.5 Yes C2 -40 125
SLSTK2021A 8051 50 16 2.25 16 Yes 12-bit, 15-ch. No Yes 5 3 2 2 1 1 1 0 0 0 0 No Yes 2.2 3.6 QFN20 3x3 ±1.5 Yes C2 -40 85
SLSTK2021A 8051 50 16 2.25 21 Yes 12-bit, 20-ch. No Yes 5 3 2 2 1 1 1 0 0 0 0 No Yes 2.2 3.6 QSOP24 8.7x3.9 ±1.5 Yes C2 -40 85
SLSTK2021A 8051 50 16 2.25 16 Yes 12-bit, 15-ch. No Yes 5 3 2 2 1 1 1 0 0 0 0 No Yes 2.2 3.6 QFN20 3x3 ±1.5 Yes C2 -40 125
SLSTK2021A 8051 50 16 2.25 21 Yes 12-bit, 20-ch. No Yes 5 3 2 2 1 1 1 0 0 0 0 No Yes 2.2 3.6 QSOP24 8.7x3.9 ±1.5 Yes C2 -40 125
SLSTK2021A 8051 50 16 2.25 22 Yes 12-bit, 20-ch. No Yes 5 3 2 2 1 1 1 0 0 0 0 No Yes 2.2 3.6 QFN28 5x5 ±1.5 Yes C2 -40 125
SLSTK2021A 8051 50 16 2.25 22 Yes 12-bit, 20-ch. No Yes 5 3 2 2 1 1 1 0 0 0 0 No Yes 2.2 3.6 QFN28 5x5 ±1.5 Yes C2 -40 85
SLSTK2021A 8051 50 16 2.25 22 Yes 12-bit, 20-ch. No Yes 5 3 2 2 1 1 1 0 0 0 0 No Yes 2.2 3.6 QFN28 5x5 ±1.5 Yes C2 -40 125
SLSTK2022A 8051 50 16 2.25 20 Yes 12-bit, 12-ch. No Yes 6 6 12-bit, 2-ch. 2 2 1 1 0 0 0 0 0 No Yes 2.2 3.6 QFN24 3x3 ±2 Yes C2 -40 85
SLSTK2022A 8051 50 16 2.25 29 Yes 12-bit, 20-ch. No Yes 6 6 12-bit, 2-ch. 2 2 1 1 0 0 0 0 0 No Yes 2.2 3.6 QFN32 4x4 ±2 Yes C2 -40 85
SLSTK2022A 8051 50 16 2.25 28 Yes 12-bit, 20-ch. No Yes 6 6 12-bit, 2-ch. 2 2 1 1 0 0 0 0 0 No Yes 2.2 3.6 QFP32 7x7 ±2 Yes C2 -40 85
SLSTK2022A 8051 50 16 2.25 21 Yes 12-bit, 13-ch. No Yes 6 6 12-bit, 2-ch. 2 2 1 1 0 0 0 0 0 No Yes 2.2 3.6 QSOP24 8.7x3.9 ±2 Yes C2 -40 85
SLSTK2022A 8051 50 16 2.25 20 Yes 12-bit, 12-ch. No Yes 6 6 12-bit, 2-ch. 2 2 1 1 1 0 0 0 0 No Yes 2.2 3.6 QFN24 3x3 ±2 Yes C2 -40 125
SLSTK2022A 8051 50 16 2.25 29 Yes 12-bit, 20-ch. No Yes 6 6 12-bit, 2-ch. 2 2 1 1 1 0 0 0 0 No Yes 2.2 3.6 QFN32 4x4 ±2 Yes C2 -40 125
SLSTK2022A 8051 50 16 2.25 28 Yes 12-bit, 20-ch. No Yes 6 6 12-bit, 2-ch. 2 2 1 1 1 0 0 0 0 No Yes 2.2 3.6 QFP32 7x7 ±2 Yes C2 -40 125
SLSTK2022A 8051 50 16 2.25 21 Yes 12-bit, 13-ch. No Yes 6 6 12-bit, 2-ch. 2 2 1 1 1 0 0 0 0 No Yes 2.2 3.6 QSOP24 8.7x3.9 ±2 Yes C2 -40 125
SLSTK2022A 8051 50 32 2.25 20 Yes 12-bit, 12-ch. No Yes 6 6 12-bit, 2-ch. 2 2 1 1 0 0 0 0 0 No Yes 2.2 3.6 QFN24 3x3 ±2 Yes C2 -40 85
SLSTK2022A 8051 50 32 2.25 29 Yes 12-bit, 20-ch. No Yes 6 6 12-bit, 2-ch. 2 2 1 1 0 0 0 0 0 No Yes 2.2 3.6 QFN32 4x4 ±2 Yes C2 -40 85
SLSTK2022A 8051 50 32 2.25 28 Yes 12-bit, 20-ch. No Yes 6 6 12-bit, 2-ch. 2 2 1 1 0 0 0 0 0 No Yes 2.2 3.6 QFP32 7x7 ±2 Yes C2 -40 85
SLSTK2022A 8051 50 32 2.25 21 Yes 12-bit, 13-ch. No Yes 6 6 12-bit, 2-ch. 2 2 1 1 0 0 0 0 0 No Yes 2.2 3.6 QSOP24 8.7x3.9 ±2 Yes C2 -40 85
SLSTK2022A 8051 50 32 2.25 20 Yes 12-bit, 12-ch. No Yes 6 6 12-bit, 2-ch. 2 2 1 1 1 0 0 0 0 No Yes 2.2 3.6 QFN24 3x3 ±2 Yes C2 -40 125
SLSTK2022A 8051 50 32 2.25 29 Yes 12-bit, 20-ch. No Yes 6 6 12-bit, 2-ch. 2 2 1 1 1 0 0 0 0 No Yes 2.2 3.6 QFN32 4x4 ±2 Yes C2 -40 125
SLSTK2022A 8051 50 32 2.25 28 Yes 12-bit, 20-ch. No Yes 6 6 12-bit, 2-ch. 2 2 1 1 1 0 0 0 0 No Yes 2.2 3.6 QFP32 7x7 ±2 Yes C2 -40 125
SLSTK2022A 8051 50 32 2.25 21 Yes 12-bit, 13-ch. No Yes 6 6 12-bit, 2-ch. 2 2 1 1 1 0 0 0 0 No Yes 2.2 3.6 QSOP24 8.7x3.9 ±2 Yes C2 -40 125
SLSTK2022A 8051 50 64 4.25 20 Yes 12-bit, 12-ch. No Yes 6 6 12-bit, 4-ch. 2 2 1 1 0 0 0 0 0 No Yes 2.2 3.6 QFN24 3x3 ±2 Yes C2 -40 85
SLSTK2022A 8051 50 64 4.25 29 Yes 12-bit, 20-ch. No Yes 6 6 12-bit, 4-ch. 2 2 1 1 0 0 0 0 0 No Yes 2.2 3.6 QFN32 4x4 ±2 Yes C2 -40 85
SLSTK2022A 8051 50 64 4.25 28 Yes 12-bit, 20-ch. No Yes 6 6 12-bit, 4-ch. 2 2 1 1 0 0 0 0 0 No Yes 2.2 3.6 QFP32 7x7 ±2 Yes C2 -40 85
SLSTK2022A 8051 50 64 4.25 21 Yes 12-bit, 13-ch. No Yes 6 6 12-bit, 4-ch. 2 2 1 1 0 0 0 0 0 No Yes 2.2 3.6 QSOP24 8.7x3.9 ±2 Yes C2 -40 85
SLSTK2022A 8051 50 64 4.25 20 Yes 12-bit, 12-ch. No Yes 6 6 12-bit, 4-ch. 2 2 1 1 1 0 0 0 0 No Yes 2.2 3.6 QFN24 3x3 ±2 Yes C2 -40 125
SLSTK2022A 8051 50 64 4.25 29 Yes 12-bit, 20-ch. No Yes 6 6 12-bit, 4-ch. 2 2 1 1 1 0 0 0 0 No Yes 2.2 3.6 QFN32 4x4 ±2 Yes C2 -40 125
SLSTK2022A 8051 50 64 4.25 28 Yes 12-bit, 20-ch. No Yes 6 6 12-bit, 4-ch. 2 2 1 1 1 0 0 0 0 No Yes 2.2 3.6 QFP32 7x7 ±2 Yes C2 -40 125
SLSTK2022A 8051 50 64 4.25 21 Yes 12-bit, 13-ch. No Yes 6 6 12-bit, 4-ch. 2 2 1 1 1 0 0 0 0 No Yes 2.2 3.6 QSOP24 8.7x3.9 ±2 Yes C2 -40 125
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