EFM8 Sleepy Bee Family EFM8SB2 Data Sheet The EFM8SB2, part of the Sleepy Bee family of MCUs, is the ENERGY FRIENDLY FEATURES worlds most energy friendly 8-bit microcontrollers with a compre- Lowest MCU sleep current with supply hensive feature set in small packages. brownout detection (50 nA) These devices offer lowest power consumption by combining innovative low energy tech- Lowest MCU active current with these features (170 A / MHz at 24.5 MHz clock niques and short wakeup times from energy saving modes into small packages, making rate) them well-suited for any battery operated applications. With an efficient 8051 core, 6-bit current reference, and precision analog, the EFM8SB2 family is also optimal for embed- Lowest MCU sleep current using internal RTC operating and supply brownout ded applications. detection (<300 nA) EFM8SB2 applications include the following: Ultra-fast wake up for digital and analog peripherals (< 2 s) Battery-operated consumer electronics Hand-held devices Integrated low drop out (LDO) voltage Sensor interfaces Industrial controls regulator to maintain ultra-low active current at all voltages Core / Memory Clock Management Energy Management Low Power 20 CIP-51 8051 Core External Internal LDO MHz RC Power-On Reset Oscillator Regulator (25 MHz) Oscillator Flash Program High Frequency RAM Memory Debug Interface External 32 kHz Memory 24.5 MHz RC Brown-Out Detector (4352 bytes) with C2 RTC Oscillator (up to 64 KB) Oscillator 8-bit SFR bus Serial Interfaces I/O Ports Timers and Triggers Analog Interfaces Security Comparator 0 16/32-bit CRC External Timers ADC UART 2 x SPI Pin Reset PCA/PWM Interrupts 0/1/2/3 Internal Voltage Comparator 1 Reference General Watchdog Real Time 2 I C / SMBus Pin Wakeup Purpose I/O Timer Clock Internal Current Reference Lowest power mode with peripheral operational: Normal Idle Suspend Sleep silabs.com Smart. Connected. Energy-friendly. Rev. 1.2 EFM8SB2 Data Sheet Feature List 1. Feature List The EFM8SB2 highlighted features are listed below. Core: Timers/Counters and PWM: Pipelined CIP-51 Core 32-bit Real Time Clock (RTC) Fully compatible with standard 8051 instruction set 6-channel programmable counter array (PCA) supporting 70% of instructions execute in 1-2 clock cycles PWM, capture/compare, and frequency output modes with watchdog timer function 25 MHz maximum operating frequency 4 x 16-bit general-purpose timers Memory: Communications and Digital Peripherals: Up to 64 kB flash memory, in-system re-programmable from firmware. UART Up to 4352 bytes RAM (including 256 bytes standard 8051 2 x SPI Master / Slave RAM and 4096 bytes on-chip XRAM) SMBus/I2C Master / Slave Power: External Memory Interface (EMIF) Internal LDO regulator for CPU core voltage 16-bit/32-bit CRC unit, supporting automatic CRC of flash at Power-on reset circuit and brownout detectors 1024-byte boundaries I/O: Up to 24 total multifunction I/O pins: Analog: All pins 5 V tolerant under bias Programmable current reference (IREF0) Flexible peripheral crossbar for peripheral routing 10-Bit Analog-to-Digital Converter (ADC0) 5 mA source, 12.5 mA sink allows direct drive of LEDs 2 x Low-current analog comparators Clock Sources: On-Chip, Non-Intrusive Debugging Internal 20 MHz low power oscillator with 10% accuracy Full memory and register inspection Internal 24.5 MHz precision oscillator with 2% accuracy Four hardware breakpoints, single-stepping External RTC 32 kHz crystal Pre-loaded UART bootloader External crystal, RC, C, and CMOS clock options Temperature range -40 to 85 C Single power supply 1.8 to 3.6 V QFP32, QFN32, and QFN24 packages With on-chip power-on reset, voltage supply monitor, watchdog timer, and clock oscillator, the EFM8SB2 devices are truly standalone system-on-a-chip solutions. The flash memory is reprogrammable in-circuit, providing non-volatile data storage and allowing field up- grades of the firmware. The on-chip debugging interface (C2) allows non-intrusive (uses no on-chip resources), full speed, in-circuit debugging using the production MCU installed in the final application. This debug logic supports inspection and modification of memory and registers, setting breakpoints, single stepping, and run and halt commands. All analog and digital peripherals are fully functional while debugging. Each device is specified for 1.8 to 3.6 V operation and is available in 24-pin QFN, 32-pin QFN, or 32-pin QFP pack- ages. All package options are lead-free and RoHS compliant. silabs.com Smart. Connected. Energy-friendly. Rev. 1.2 1