EZRadio Copyright © 2010 by Silicon Laboratories 6.18.10
Si4012
GPIO0/XTAL
LED
SDA
SCL
SDN
nIRQ LCOSC
PADIVIDER
XTAL
OSC
AUTO
TUNE
FSK
OOK
LPOSC
LDO
POR
BANDGAP
VA
VD
TXP
TXM
VDD
GND
SLP
TMR
RF ANALOG CO RE
ANTENNA
TUNE
MODULATOR
SMBus
INTERFACE
DIGITAL LOGIC
TX
256 BYTE
DATA FIFO
REGISTER
BANK
DIGITAL
CONTROLLER
BATTERY
MONITOR
Si4012
Crystal-less RF Transmitter
Description
Silicon Laboratories’ Si4012 is a fully integrated crystal-less
CMOS high-data rate RF transmitter designed for the sub-GHz
ISM band. This chip is optimized for bat tery powered applications
requiring low standby currents and high output transmit power.
The device offers advanced radio features including continuous
frequency coverage from 27–960 MHz, adjustable output power of
up to +10 dBm, and data rates up to 100 Kbaud in FSK mode. The
Si4012’s high level of integration offers reduced BOM cost while
simplifying the overall system design.
The transmitter supports data streaming into the TX FIFO without
external MCU support. The digital transmit modulation and
automatic PA power ramping ensure precise transmit modulation
and reduced spectral splatter, ensuring compliance with FCC,
ETSI, and ARIB regulations. Additional system features such as
the low battery detector and 256 byte TX FIFO reduce overall
current consumption and allow the use of lower-cost system
MCUs. The Si4012 is optimized for wireless MBUS T1-mode.
The device leverages Silicon Labs' patented and proven crystal-
less oscillator technology and offers better than ±150 ppm carrier
frequency stability over the temperature range of 0 to + 70 °C and
±250 ppm carrier frequency stability over the industrial range of
–40 to +85 °C without the use of an external crystal or frequency
reference. The Si4012 automatically calibrates the on-chip voltage
controlled oscillator (LCOSC) which forms the output carrier fre-
quency for process and temperature variations. An external 1-pin
crystal oscillator option is available for applications requiring
tighter frequency tolerances. The Si4012 is d esigned to work with
an MCU and a few passives to create a very low-cost system. Volt-
age regulators are integrated on-chip, which allows for a wide
range of operating supply voltage conditions from +1.8 to +3.6 V.
Digital integration reduces the amount of required external compo-
nents compared to traditional offerings. The high integration of the
Si4012 improves the system manufacturing reliability, quality, and
minimizes costs. This chip offers industry leading RF performance,
high integration, flexibility, low BOM, small board area, and ease of
design. No production alignment is necessary as all RF functions
are integrated into the device.
Features
-Frequency Range = 27–960 MHz
-FSK and OOK modulation
-Output Power
-Maximum: +10 dBm
-Configurable: –13 to +10 dBm
-Crystal-less operation
-±150 ppm: 0 to + 70 °C
-±250 ppm: –40 to + 85 °C
-Optional crystal input for tighter tolerances
-Data Rate
-FSK: 0.1 to 100 Kbaud
-OOK: 0.1 to 20 Kbaud
-Power Supply = 1.8 to 3.6 V
-TX 256 byte FIFO
-Low battery detector
-SMBus interface
-–40 to +85 °C temperature range
-10-pin MSOP, Pb free/RoHS compliant
Applications
-Remote meter reading
-Wireless MBUS T1-mode
-Remote control
-Remote keyless entry
-Home security and alarm
-Telemetry
-Toy control
-Home automation
-Industrial control
-Sensor networks
-Health monitors
Copyright © 2010 by Silicon Laboratories 6.18.10
Silicon Laboratories and Silicon Labs are trademarks of Silicon Laboratories Inc.
Other products or brandnames mentioned herein are trademarks or registered trademarks of their respective holders
Si4012
Crystal-less High-data Rate RF Transmitter
Selected Electrical Specifications
Parameter Symbol Test Condition Min Typ Max Unit
Supply Voltage Range Vdd 1.8 — 3.6 V
Power Saving Modes
IShutdown Lowest current mode — 100 — nA
IIdle Register values retained, lowest current
consumption idle mode —700— nA
ITune Register values retained, LCOSC on,
fastest response to TX mode —5— mA
TX Mode Current @ +10 dBm ITX_OOK OOK, Manchester encoded — 14.2 — mA
ITX_FSK FSK — 19.8 — mA
Mode Response Time to TX
tShutdown-TX — 21.4 — ms
tShutdown-
Idle — 16.4 — ms
tIdle-TX —5— ms
tTune-TX —100— us
Frequency Range FRange 27 — 960 MHz
Carrier Frequency Accuracy 0 to + 70 °C –150 — +150 ppm
–40 to + 85 °C –250 — +250 ppm
Error contribution using optional crystal –10 — +10 ppm
Frequency Noise (rms) Allen deviation, measured across 1ms
interval — 0.3 — ppm
Frequency Tuning Time — 5 — ms
FSK Modulation Data Rate DRFSK 0.1 — 100 Kbaud
OOK Modulation Data Rate DROOK 0.1 — 50 Kbaud
Transmit Power
Configurable output power range with
optimum load and VDD > 2.2 V –13 — +10 dBm
Power variation vs temp and supply , with
optimum load and VDD > 2.2 V –1.0 — +0.5 dB
Power variation vs temp and supply , with
optimum load and VDD > 1.8 V –2.5 — +0.5 dB
Step size from –13 to +6.5 dBm with
optimum load and VDD > 2.2 V —0.25— dB
FSK Deviation — 300 — ppm
Operating Ambient T emperature
Range TA–40 — 85 °C
MSOP-10 Pin Package
2
3
6
7
8
4
5
9SCL
SDN
nIRQ
LEDVDD
GPIO0/XTAL
TXP
GND
TXM
110 SDA
Si4012
Symbol Min Nom Max Symbol Min Nom Max
A — — 1.10 e 0.50 BSC
A1 0.00 — 0.15 L 0.40 0.60 0.80
A2 0.75 0.85 0.95 L2 0.25 BSC
b 0.17 — 0.33 q 0° — 8°
c 0.08 — 0.23 aaa — — 0.20
D 3.00 BSC bbb — — 0.25
E 4.90 BSC ccc — — 0.10
E1 3.00 BSC ddd — — 0.08
Notes:
1. All dimensions are shown in millimeters (mm).
2. Dimensioning and tolerancing per ASME Y14 .5M-1994.
3. This drawing conforms to JEDEC Outline MS012, variation ”BA.”
4. Recommended card reflow profile is per the JEDEC/IPC J-STD-020
specification for Small Body Components.
Disclaimer
Silicon Laboratories intends to provide customers with the latest, accurate, and in-depth documentation of all peripherals and modules available for system and software implementers
using or intending to use the Silicon Laboratories products. Characterization data, available modules and peripherals, memory sizes and memory addresses refer to each specific
device, and "Typical" parameters provided can and do vary in different applications. Application examples described herein are for illustrative purposes only. Silicon Laboratories
reserves the right to make changes without further notice and limitation to product information, specifications, and descriptions herein, and does not give warranties as to the accuracy
or completeness of the included information. Silicon Laboratories shall have no liability for the consequences of use of the information supplied herein. This document does not imply
or express copyright licenses granted hereunder to design or fabricate any integrated circuits. The products must not be used within any Life Support System without the specific
written consent of Silicon Laboratories. A "Life Support System" is any product or system intended to support or sustain life and/or health, which, if it fails, can be reasonably expected
to result in significant personal injury or death. Silicon Laboratories products are generally not intended for military applications. Silicon Laboratories products shall under no
circumstances be used in weapons of mass destruction including (but not limited to) nuclear, biological or chemical weapons, or missiles capable of delivering such weapons.
Trademark Information
Silicon Laboratories Inc., Silicon Laboratories, Silicon Labs, SiLabs and the Silicon Labs logo, CMEMS®, EFM, EFM32, EFR, Energy Micro, Energy Micro logo and combinations
thereof, "the world’s most energy friendly microcontrollers", Ember®, EZLink®, EZMac®, EZRadio®, EZRadioPRO®, DSPLL®, ISOmodem ®, Precision32®, ProSLIC®, SiPHY®,
USBXpress® and others are trademarks or registered trademarks of Silicon Laboratories Inc. ARM, CORTEX, Cortex-M3 and THUMB are trademarks or registered trademarks of
ARM Holdings. Keil is a registered trademark of ARM Limited. All other products or brand names mentioned herein are trademarks of their respective holders.
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