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EFM8™
8-bit microcontrollers without compromise
PRODUCT SELECTOR GUIDE
8
www.silabs.com/efm8 | Smart. Connected. Energy-Friendly.
EFM8 MCUs
Fast, low-power 8-bit solutions
featuring fully-integrated analog
functionality and peripherals
8 factors that make
EFM8 the world’s only
no-compromise
8-bit microcontroller.
Fast Processor Core
Efficient Digital Peripherals
With up to 50 MHz operation and with 70% of the
instructions executing in less than 1 or 2 clock
cycles, the EFM8 MCUs offer an economical solution
that satisfy the performance needs of embedded
applications. Also, the efficient architecture reduces
memory requirements of the application.
ADC
PGA
Temp
Sense
EFM8
CAP
Sense
DAC
VREF
Autonomous digital peripherals reduce the processor
overhead. The EFM8 MCUs include high performance
timers, higher resolution PWMs and fast serial
communication peripherals including 12 Mbps SPI,
3 Mbps UART and 3.4 Mbps I2C.
High Performance Analog
Highly Integrated
The EFM8 family of MCUs offer high performance
analog peripherals such as 12-bit ADCs at 200
Ksps and 10-bit ADCs at 800 Ksps, high noise
immune Capsense peripherals and temp sensors
that reduce the system cost and simplify designs.
Digital Crossbar and
Analog Multiplexer
Silicon Labs’ patented crossbar technology
enables maximum flexibility and unparalleled ease
of development, allowing designers to select any
peripherals with no conflicts in pin-out or PCB layout.
Ultra Low Power
2µs
No Performance Compromise
The EFM8 MCUs provide no compromise peripherals
that are fully characterized with guaranteed
performance over temperature and voltage.
The EFM8 family features high precision oscillators,
integrated on-board voltage regulator, USB charger detect
circuitry and high performance peripherals in packages as
small as 3x3 mm to reduce the PCB area and BOM cost.
EFM8
150uA/
MHz
50nA
Time
EFM8 extends battery life with ultra-low sleep currents
down to 50 nA with Brown out detection, fast wake
up times with less than 2 µs, active currents as low as
150 µA/MHz and Low energy USB module for power
consumption reduction of up to 90%.
Simplicity Studio™ Software
Free Simplicity Studio with integrated IDE, free unlimited
code size Keil Compiler, demos, libraries and example
codes, energy and Capsense Profiler tools, configurators,
easily updated support packages, software and
documentation, all at your fingertips.
EFM8 Applications
Industrial
POS equipment
Smart meters
Power converters
Consumer
Data cables
Gaming
LED wristband
Home and Building
Fire and safety
Sensors
Automation
Health and Fitness
Medical
Wearables
Motor Control
Model vehicles
Small motors
Electric tools
Appliances
EFM8 microcontrollers are based on the popular
8051 core. The 8051 architecture ecosystem
represents nearly 25% of the existing MCU market.
Select a secure architecture
Select a simple solution
The EFM8 is based on a Harvard
architecture, allowing it to only execute code
fetched from program memory, and allows
locking of program memory to prevent
unauthorized examination. These are two
advantages in the EFM8 hardware that
protect a product from security attacks.
The EFM8 microcontroller is ideal for
processing 8-bit data that comes from
port I/O or sensor inputs. A great many
applications don’t require complex
mathematics processing, and benefit
significantly from the code density
advantages of an 8-bit processor when
not tasked with 16-bit or 32-bit
mathematics. Human interface functions,
sensor interfaces, and distributed
processing functions are examples that
easily benefit from the simplicity of the EFM8
solutions.
Select a low latency system
Variations in interrupt response time can
cause adverse effects in some applications,
causing, for example, audio distortion or
motor noise and vibration. With the EFM8
it’s easy to work “close to the metal” and
have full control over the entire system.
www.silabs.com | Smart. Connected. Energy-Friendly.
Despite strong media coverage
of the rapid expansion of the
ARM ecosystem, the largest
ecosystem in MCUs still exists
around the mature and tiny 8051
MCU architecture.
IHS, 2013
RAM (B)
MHz
GPIO
SPI
UART
I2C
EMIF
ADC 1
Comparator
Internal OSC
Timers
PCA/PWM
Channels
RTC
Capacitive
Sense
LFO
2
256
25
16
1
1
1
-
12-bit, 15-ch.
2
2%
4
3
-
-
Y
QFN20
4
512
25
16
1
1
1
-
12-bit, 15-ch.
2
2%
4
3
-
-
Y
2.2V to 3.6V
EFM8BB10F8G-A-SOIC16
SOIC16
8
512
25
13
1
1
1
-
12-bit, 12-ch.
2
2%
4
3
-
-
Y
2.2V to 3.6V
Operating
Voltage
Flash (kB)
QFN20
EFM8BB10F4G-A-QFN20
Package
Type
EFM8BB10F2G-A-QFN20
EFM8
BUSY BEE - GENERAL PURPOSE
EFM8BB10F8G-A-QFN20
EFM8BB10F8G-A-QSOP24
EFM8BB21F16G-B-QFN20
EFM8BB21F16G-B-QSOP24
EFM8BB22F16G-B-QFN28
2.2V to 3.6V
QFN20
8
512
25
16
1
1
1
-
12-bit, 15-ch.
2
2%
4
3
-
-
Y
2.2V to 3.6V
QSOP24
8
512
25
18
1
1
1
-
12-bit, 16-ch.
2
2%
4
3
-
-
Y
2.2V to 3.6V
2.2V to 3.6V
QFN20
16
2304
50
16
1
2
2
-
12-bit, 15-ch.
2
2%
5
3
-
-
Y
QSOP24
16
2304
50
21
1
2
2
-
12-bit, 20-ch.
2
2%
5
3
-
-
Y
2.2V to 3.6V
QFN28
16
2304
50
22
1
1
2
-
12-bit, 20-ch.
2
2%
5
3
-
-
Y
2.2V to 3.6V
SLEEPY BEE - LOW POWER
EFM8SB10F2G-A-QFN20
QFN20
2
256
25
16
1
1
1
-
12-bit, 9-ch.
1
2%
4
3
Y
13
-
1.8V to 3.6V
EFM8SB10F4G-A-QFN20
QFN20
4
512
25
16
1
1
1
-
12-bit, 9-ch.
1
2%
4
3
Y
13
-
1.8V to 3.6V
EFM8SB10F8G-A-QFN20
QFN20
8
512
25
16
1
1
1
-
12-bit, 9-ch.
1
2%
4
3
Y
13
-
1.8V to 3.6V
EFM8SB10F8G-A-QFN24
QFN24
8
512
25
17
1
1
1
-
12-bit, 10-ch.
1
2%
4
3
Y
14
-
1.8V to 3.6V
EFM8SB10F8G-A-QSOP24
QSOP24
8
512
25
17
1
1
1
-
12-bit, 10-ch.
1
2%
4
3
Y
14
-
1.8V to 3.6V
EFM8SB20F16G-A-QFN24
QFN24
16
4352
25
16
2
1
1
-
12-bit, 15-ch.
2
2%
4
6
Y
-
-
1.8V to 3.6V
EFM8SB20F32G-A-QFN24
QFN24
32
4352
25
16
2
1
1
-
12-bit, 15-ch.
2
2%
4
6
Y
-
-
1.8V to 3.6V
EFM8SB20F32G-A-QFN32
QFN32
32
4352
25
24
2
1
1
-
12-bit, 23-ch.
2
2%
4
6
Y
-
-
1.8V to 3.6V
EFM8SB20F32G-A-LQFP32
LQFP32
32
4352
25
24
2
1
1
-
12-bit, 23-ch.
2
2%
4
6
Y
-
-
1.8V to 3.6V
EFM8SB20F64G-A-QFN24
QFN24
64
4352
25
16
2
1
1
-
12-bit, 15-ch.
2
2%
4
6
Y
-
-
1.8V to 3.6V
EFM8SB20F64G-A-QFN32
QFN32
64
4352
25
24
2
1
1
-
12-bit, 23-ch.
2
2%
4
6
Y
-
-
1.8V to 3.6V
EFM8SB20F64G-A-LQFP32
LQFP32
64
4352
25
24
2
1
1
-
12-bit, 23-ch.
2
2%
4
6
Y
-
-
1.8V to 3.6V
2.2V to 5.25V
UNIVERSAL BEE - USB
EFM8UB10F8G-B-QFN20
QFN20
8
2304
48
13
1
2
2
-
12-bit,11-ch.
2
1.5%
5
3
-
-
Y
EFM8UB10F16G-B-QFN20
QFN20
16
2304
48
13
1
2
2
-
12-bit,11-ch.
2
1.5%
5
3
-
-
Y
2.2V to 5.25V
QSOP24
16
2304
48
17
1
2
2
-
12-bit,15-ch.
2
1.5%
5
3
-
-
Y
2.2V to 5.25V
EFM8UB11F16G-B-QSOP24
EFM8UB10F16G-B-QFN28
QFN28
16
2304
48
22
1
2
2
-
12-bit, 20-ch.
2
1.5%
5
3
-
-
Y
2.2V to 5.25V
EFM8UB20F32G-A-QFN32
QFN32
32
2304
48
25
1
2
2
Y
10-bit, 20-ch.
2
1.5%
6
5
-
-
-
2.2V to 5.25V
EFM8UB20F32G-A-LQFP32
LQFP32
32
2304
48
25
1
2
2
Y
10-bit, 20-ch.
2
1.5%
6
5
-
-
-
2.2V to 5.25V
EFM8UB20F32G-A-TQFP48
TQFP48
32
2304
48
40
1
2
2
Y
10-bit, 32-ch.
2
1.5%
6
5
-
-
-
2.2V to 5.25V
EFM8UB20F64G-A-QFN32
QFN32
64
4352
48
25
1
2
2
Y
10-bit, 20-ch.
2
1.5%
6
5
-
-
-
2.2V to 5.25V
EFM8UB20F64G-A-LQFP32
LQFP32
64
4352
48
25
1
2
2
Y
10-bit, 20-ch.
2
1.5%
6
5
-
-
-
2.2V to 5.25V
EFM8UB20F64G-A-TQFP48
TQFP48
64
4352
48
40
1
2
2
Y
10-bit, 32-ch.
2
1.5%
6
5
-
-
-
2.2V to 5.25V
BUSY BEE
SLEEPY BEE
UNIVERSAL BEE
General purpose up to 50 MHz
Low Power up to 25 MHz
USB up to 48 MHz
Flash: 2 - 16 KB
Flash: 2 - 64 KB
Flash: 8 - 64 KB
RAM: 0.5 - 2 KB
RAM: 0.5 - 4 KB
RAM: 2 - 4 KB
Highlights
Highlights
Highlights
SAR ADC – 12-bit at 200 ksps; 10-bit at 800 ksps
Energy friendly – 50 nA sleep mode with BOR
No external crystal or regulator needed for USB
2x low-current comparators with built-in DAC
Active mode - 150 µA/MHz
Low energy USB - up to 90% power reduction
2x UART (3 Mbps), 1x SPI (12 Mbps), 2x I2C (3.4 Mbps)
Fast wake up - < 2 µs
USB charger detect circuit (USB-BCS 1.2)
“Priority crossbar” – simplifies PCB design
Capacitive sense - < 1 µA wake on touch average
2x UART (3 Mbps), 1x SPI (12 Mbps), 2x I2C (3.4 Mbps)
Package Options
Get started with EFM8 today
Debugger
Display
Expansion Header
A 1.28 inch 128x128
pixel Memory LCD enables
interactive applications.
20-pin expansion
header for connection to
plug in boards and for future
expansion to your design.
Integrated debugger
provides everything you
need for downloading and
debugging your code. It can
be used as a standalone
debugger for other
external boards.
Energy Profile
Visualize the energy
consumption of your
application using the Simplicity
Energy Profiler tool.
Humidity and
Temperature sensor
An integrated Si7021
humidity and temperature
sensor to enable data
logging applications.
Easy pin access
Capsense Pads
Breakout pads at the top
and bottom edges of the
kit can be soldered to provide
easy access to the MCU
pins.
Capsense pads
enable button and slider
applications using Capsense
Profiler tool.
Joystick
Analog joystick with eight
measurable positions for
better demo experience.
EFM8 Starter Kits
Silicon Labs offers 6 different starter kits to get started with the EFM8 family of MCUs. All the kits are priced at $29.99.
Part number
Description
Demo Highlights
Tools
SLSTK2020A
EFM8BB1 Family Starter Kit
ADC, Temperature sensor, Fast core
Energy Profiler, Configurator
SLSTK2021A
EFM8BB2 Family Starter Kit
ADC, Temperature sensor, Fast core
Energy Profiler, Configurator
SLSTK2000A
EFM8UB1 Family Starter Kit
Low energy USB, Charger Detect
Energy Profiler, Configurator
SLSTK2001A
EFM8UB2 Family Starter Kit
USB HID, USB-UART bridge
Energy Profiler, Configurator
SLSTK2010A
EFM8SB1 Family Starter Kit
Capsense, Low energy modes
Capsense Profiler, Energy Profiler, Configurator
SLSTK2011A
EFM8SB2 Family Starter Kit
Low energy modes, Temperature sensor
Energy Profiler, Configurator
Silicon Labs
Simplicity
Studio tools
make EFM8
development
fast and simple.
Simplicity Studio
Easy access to the Simplicity IDE,
configuration tools, demos, examples,
datasheets, application notes,
community forum and Silicon Labs
support, plus an unlimited code size
Keil compiler, all free of charge.
www.silabs.com/simplicity
s
licon Lab
Si
C
O
MM
T
LONGEVITY
IT M E
N
EFM8 Starter Kits
Capacitive Sense Profiler
Longevity Commitment
Silicon Labs Community
This $29.99 kit is an excellent
starting point to get familiar
with EFM8 microcontrollers.
This tool simplifies the fine
tuning of buttons, sliders,
wheels, touch pads and
proximity sensors.
Silicon labs is committed to a
minimum 10-year life cycle.
Find the support and answers
you need on Silicon Labs
community forum.
www.silabs.com/efm8-kits
community.silabs.com
To buy or sample online, or find your nearest distributor,
see details at www.silabs.com/efm8
©2015, SILICON LABORATORIES INC. SIMPLICITY STUDIO, SILICON LABS AND THE SILICON LABS LOGO ARE TRADEMARKS OR REGISTERED TRADEMARKS OF SILICON LABORATORIES INC. ALL OTHER PRODUCT OR
SERVICE NAMES ARE THE PROPERTY OF THEIR RESPECTIVE OWNERS. FOR THE MOST UP TO DATE INFORMATION PLEASE SEE YOUR SALES REPRESENTATIVE OR VISIT OUR WEBSITE AT WWW.SILABS.COM. CSI, 5000.
FEBRUARY 2015, REV A SEL-EFM8
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