EFM8 Sleepy Bee Family
EFM8SB1 Data Sheet
The EFM8SB1, 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, 14
high-quality capacitive sense channels, and precision analog, the EFM8SB1 family is al-
so optimal for embedded applications.
EFM8SB1 applications include the following:
• Touch pads / key pads
• Wearables
• Instrumentation panels
• Battery-operated consumer electronics
ENERGY FRIENDLY FEATURES
• Lowest MCU sleep current with supply
brownout (50 nA)
• Lowest MCU active current (150 μA / MHz
at 24.5 MHz)
• Lowest MCU wake on touch average
current (< 1 μA)
• Lowest sleep current using internal RTC
and supply brownout (< 300 nA)
• Ultra-fast wake up for digital and analog
peripherals (< 2 μs)
• Integrated LDO to maintain ultra-low
active current at all voltages
Core / Memory
CIP-51 8051 Core
(25 MHz)
Flash Program
Memory
(up to 8 KB)
Clock Management
External
Oscillator
Low Frequency
RC Oscillator
Low Power 20 MHz
RC Oscillator
High Frequency
24.5 MHz RC
Oscillator
Energy Management
Internal LDO
Regulator
Power-On Reset
RAM Memory
(up to 512 bytes)
Debug Interface
with C2
External 32 kHz RTC Oscillator
8-bit SFR bus
Brown-Out Detector
Serial Interfaces
UART
SPI
I/O Ports
External
Interrupts
General
Purpose I/O
Timers and Triggers
Timers
0/1/2/3
Watchdog
Timer
PCA/PWM
Real Time
Clock
Analog Interfaces
ADC
Internal Current
Reference
Security
16-bit CRC
Pin Reset
Comparator 0
Internal Voltage
Reference
I
2
C / SMBus
Pin Wakeup
Capacitive Sense
Lowest power mode with peripheral operational:
Normal
Idle
Suspend
Sleep
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Rev. 1.4
EFM8SB1 Data Sheet
Feature List
1. Feature List
The EFM8SB1 highlighted features are listed below.
• Core:
• Pipelined CIP-51 Core
• Fully compatible with standard 8051 instruction set
• 70% of instructions execute in 1-2 clock cycles
• 25 MHz maximum operating frequency
• Memory:
• Up to 8 kB flash memory, in-system re-programmable
from firmware.
• Up to 512 bytes RAM (including 256 bytes standard 8051
RAM and 256 bytes on-chip XRAM)
• Power:
• Internal LDO regulator for CPU core voltage
• Power-on reset circuit and brownout detectors
• I/O: Up to 17 total multifunction I/O pins:
• Flexible peripheral crossbar for peripheral routing
• 5 mA source, 12.5 mA sink allows direct drive of LEDs
• Clock Sources:
• Internal 20 MHz low power oscillator with ±10% accuracy
• Internal 24.5 MHz precision oscillator with ±2% accuracy
• Internal 16.4 kHz low-frequency oscillator or RTC 32 kHz
crystal (RTC crystal not available on CSP16 packages)
• External crystal, RC, C, and CMOS clock options
• Timers/Counters and PWM:
• 32-bit Real Time Clock (RTC)
• 3-channel Programmable Counter Array (PCA) supporting
PWM, capture/compare, and frequency output modes with
watchdog timer function
• 4 x 16-bit general-purpose timers
• Communications and Digital Peripherals:
• UART
• SPI™ Master / Slave
• SMBus™ / I2C™ Master / Slave
• 16-bit CRC unit, supporting automatic CRC of flash at 256-
byte boundaries
• Analog:
• Capacitive Sense (CS0)
• Programmable current reference (IREF0)
• 12-Bit Analog-to-Digital Converter (ADC0)
• 1 x Low-current analog comparator
• On-Chip, Non-Intrusive Debugging
• Full memory and register inspection
• Four hardware breakpoints, single-stepping
• Pre-loaded UART bootloader
• Temperature range -40 to 85 ºC
• Single power supply 1.8 to 3.6 V
• QSOP24, QFN24, QFN20, and CSP16 packages
With on-chip power-on reset, voltage supply monitor, watchdog timer, and clock oscillator, the EFM8SB1 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. Devices are AEC-Q100 qualified (Grade 3) and are available in 16-
pin CSP, 20-pin QFN, 24-pin QFN, or 24-pin QSOP packages. All package options are lead-free and RoHS compliant.
Note:
CSP devices can be handled and soldered using industry standard surface mount assembly techniques. However, because CSP
devices are essentially a piece of silicon and are not encapsulated in plastic, they are susceptible to mechanical damage and may be
sensitive to light. When CSP packages must be used in an environment exposed to light, it may be necessary to cover the top and
sides with an opaque material.
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Rev. 1.4 | 1
EFM8SB1 Data Sheet
Ordering Information
2. Ordering Information
EFM8 SB1 0 F 8 G
–
A
–
QSOP24 R
Tape and Reel (Optional)
Package Type
Revision
Temperature Grade G (-40 to +85), A (-40 to +85, Automotive Grade)
Flash Memory Size – 8 KB
Memory Type (Flash)
Family Feature Set
Sleepy Bee 1 Family
Silicon Labs EFM8 Product Line
Figure 2.1. EFM8SB1 Part Numbering
All EFM8SB1 family members have the following features:
• CIP-51 Core running up to 25 MHz
• Three Internal Oscillators (24.5 MHz, 20 MHz, and 16 kHz)
• SMBus / I2C
• SPI
• UART
• 3-Channel Programmable Counter Array (PWM, Clock Generation, Capture/Compare)
• 4 16-bit Timers
• Analog Comparator
• 6-bit current sourc reference
• 12-bit Analog-to-Digital Converter with integrated multiplexer, voltage reference, and temperature sensor
• 16-bit CRC Unit
• AEC-Q100 qualified (Grade 3)
• Pre-loaded UART bootloader
In addition to these features, each part number in the EFM8SB1 family has a set of features that vary across the product line. The
product selection guide shows the features available on each family member.
Table 2.1. Product Selection Guide
Temperature Range
Flash Memory (kB)
Ordering Part
ADC0 Channels
Touch Inputs
RAM (Bytes)
Digital Port
I/Os (Total)
Capacitive
(RoHS Compliant)
Number
EFM8SB10F8G-A-QSOP24
EFM8SB10F8G-A-QFN24
EFM8SB10F8G-A-QFN20
EFM8SB10F8G-A-CSP16
EFM8SB10F4G-A-QFN20
8
8
8
8
4
512
512
512
512
512
17
17
16
13
16
10
10
9
9
9
14
14
13
12
13
Pb-free
Yes
Yes
Yes
Yes
Yes
-40 to +85 C
-40 to +85 C
-40 to +85 C
-40 to +85 C
-40 to +85 C
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Package
QSOP24
QFN24
QFN20G
CSP16
QFN20G
Rev. 1.4 | 2
Real-time operating system RTOS
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