The EFM8BB31F16I-4QFN24 is part of the Busy Bee family of 8051 based 8-bit MCUs. Built on top of a low power platform this device operates at 50 MHz. The EFM8BB31F16I-4QFN24 includes 16 kB Flash, 2.25 kB RAM, 20 Dig I/O Pins, 6 x 16-bit Timers, 0 PCA Channels, -40 to 125 ºC temperature range, Industrial grade, 4x4 QFN24 package, and additional communication peripherals.

Pipelined 8-bit 8051 MCU Core with
50 MHz operating frequency
Up to 29 multifunction I/O pins
One 12-bit/10-bit ADC
Four 12-bit DACs with synchronization
and PWM capabilities
Two low-current analog comparators with
built-in reference DACs
Internal temperature sensor
Internal 49 MHz and 24.5 MHz oscillators
accurate to ±2%
Four channels of Configurable Logic
6-channel PWM / PCA
Six 16-bit general-purpose timersCore:
Pipelined CIP-51 Core
Fully compatible with standard 8051 instruction set
70% of instructions execute in 1-2 clock cycles
50 MHz maximum operating frequency
Memory:
Up to 64 kB flash memory (63 kB user-accessible), in-sys-
tem re-programmable from firmware in 512-byte sectors
Up to 4352 bytes RAM (including 256 bytes standard 8051
RAM and 4096 bytes on-chip XRAM)
Power:
Internal LDO regulator for CPU core voltage
Power-on reset circuit and brownout detectors
I/O: Up to 29 total multifunction I/O pins:
Up to 25 pins 5 V tolerant under bias
Selectable state retention through reset events
Flexible peripheral crossbar for peripheral routing
5 mA source, 12.5 mA sink allows direct drive of LEDs
Clock Sources:
Internal 49 MHz oscillator with accuracy of ±2%
Internal 24.5 MHz oscillator with ±2% accuracy
Internal 80 kHz low-frequency oscillatorAnalog:
12/10-Bit Analog-to-Digital Converter (ADC)
Internal temperature sensor
4 x 12-Bit Digital-to-Analog Converters (DAC)
2 x Low-current analog comparators with adjustable refer-
ence
Communications and Digital Peripherals:
2 x UART, up to 3 Mbaud
SPI™ Master / Slave, up to 12 Mbps
SMBus™/I2C™ Master / Slave, up to 400 kbps
I
2C High-Speed Slave, up to 3.4 Mbps
16-bit CRC unit, supporting automatic CRC of flash at 256-
byte boundaries
4 Configurable Logic Units
Timers/Counters and PWM:
6-channel programmable counter array (PCA) supporting
PWM, capture/compare, and frequency output modes
6 x 16-bit general-purpose timers
Independent watchdog timer, clocked from the low frequen-
cy oscillator
On-Chip, Non-Intrusive Debugging