EFM8 Sleepy Bee Family
EFM8SB2 Reference Manual
The EFM8SB2, part of the Sleepy Bee family of MCUs, is the
world's most energy friendly 8-bit microcontrollers with a compre-
hensive feature set in small packages.
These devices offer lowest power consumption by combining innovative low energy tech-
niques and short wakeup times from energy saving modes into small packages, making
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-
ded applications.
EFM8SB2 applications include the following:
• Hand-held devices
• Industrial controls
Core / Memory
CIP-51 8051 Core
(25 MHz)
Flash Program
RAM Memory
Memory
(4352 bytes)
(up to 64 KB)
Serial Interfaces
UART
2 x SPI
2
I
C / SMBus
Lowest power mode with peripheral operational:
Normal
Idle
silabs.com | Smart. Connected. Energy-friendly.
• Battery-operated consumer electronics
• Sensor interfaces
Debug Interface
External 32 kHz
with C2
RTC Oscillator
I/O Ports
External
Pin Reset
Interrupts
General
Pin Wakeup
Purpose I/O
Suspend
Sleep
Clock Management
Low Power 20
External
MHz RC
Oscillator
Oscillator
High Frequency
24.5 MHz RC
Oscillator
8-bit SFR bus
Timers and Triggers
Timers
PCA/PWM
0/1/2/3
Watchdog
Real Time
Timer
Clock
ENERGY FRIENDLY FEATURES
• Lowest MCU sleep current with supply
brownout detection (50 nA)
• Lowest MCU active current with these
features (170 μA / MHz at 24.5 MHz clock
rate)
• Lowest MCU sleep current using internal
RTC operating and supply brownout
detection (<300 nA)
• Ultra-fast wake up for digital and analog
peripherals (< 2 μs)
• Integrated low drop out (LDO) voltage
regulator to maintain ultra-low active
current at all voltages
Energy Management
Internal LDO
Power-On Reset
Regulator
Brown-Out Detector
Analog Interfaces
ADC
Comparator 0
Internal Voltage
Comparator 1
Reference
Internal Current Reference
Security
16/32-bit CRC
Rev. 0.1
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