​Si4420 and Si4421 RF Transmitters​

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Si4420 and Si4421 single-chip, low-power, multi-channel FSK/OOK RF transmitters

The Si4420/21 RF transmitters have a completely integrated PLL for easy RF design, and their rapid settling time enables fast frequency-hopping, bypassing multipath fading and interference to achieve very robust wireless links. The PLL’s high resolution allows the use of multiple channels in any of the bands. Highly stable and accurate FSK modulation is accomplished by closed-loop modulation with bit rates up to 256 kbps. In addition to the FSK modulation features, the microcontroller clock, wake-up timer, low battery detector, output power level and antenna tuning capability are also programmable through the serial interface.

*315 MHz band not available with Si4421

 

Features

  • Fully integrated (low BOM, easy design-in)
  • Automatic antenna tuning circuit
  • No alignment required in production
  • Fast frequency-hopping capability
  • Fast-settling, programmable, high-resolution PLL synthesizer
  • High-bit rate (up to 115.2 kbps in digital mode and 256 kbps in analog mode)
  • Stable and accurate FSK modulation with programmable deviation
  • Direct loop antenna drive
  • Programmable output power level
 

Applications

  • Remote control
  •  Home security and alarm
  • Wireless keyboard/mouse and other PC peripherals
  • Wireless toys
  • Remote keyless entry
  • Tire pressure monitoring
  • Telemetry
  • Personal/patient data logging
  • Remote automatic meter reading

 

Technologies

  • SPI-compatible microcontroller interface
  • Power-saving sleep mode
  • Multiple event handling options for wake-up activation
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Documentation    Expand All   Collapse All

 
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Data Sheet (2)

Document NameDescriptionVersionLast Updated
Si4420.pdf
Si4420 Data Sheet1.712/12/2008
Si4421.pdf
Si4421 Data Sheet2.412/12/2008

User Guides (2)

Document NameDescriptionVersionLast Updated
EZLink_UG.pdf
EZLink™ Fast Prototyping Modules—User Guide0.111/25/2008
WDS_Chip_Config_UG.pdf
WDS Chip Configurator User Guide0.24/9/2010

Application Notes (1)

Document NameDescriptionVersionLast Updated
an422.pdf
AN422: Antenna Development Guide for the Si4020, Si4320, and Si4420 ISM Band FSK EZRadio Chipsets1.517/15/2009

White Papers (1)

Document NameDescriptionVersionLast Updated
Key-Priorities-for-Sub-GHz-Wireless-Deployments.pdf
The benefits and trends of sub-GHz wireless IC systems among various industry applications

Miscellaneous (1)

Document NameDescriptionVersionLast Updated
RF_Wireless_Foundation_CB1.pdf
RF Wireless Foundation Course Book One0.111/24/2008
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Development Kits

 

Design Tools    Expand All   Collapse All

 
 Get notified when these files are updated.

Software (10)

Document NameDescriptionVersionUpdated
Battery Life Calculator.zip
Battery Life Calculator
Chip Configurator Scripts.zip
Chip Configurator Scripts
Chip Configurator.zip
Chip Configurator v2.4 (unsupported version)2.4
WDS3-Setup.exe
Chip Configurator v3.1.4.03.1.4.0 (7 Dec 2011)12/7/2011
EZLink Chat 2.2.zip
EZLink Chat 2.22.20
EZLinkChat.zip
EZLinkChat
LoadBoard_2.x_driver.zip
Loadboard (MSC-DKLB2.x) USB Driver2.x
dotnetfx.zip
Microsoft®.NET
RF Range Calculator v8.3.zip
RF Range Calculator v8.38.311/30/2011
WDS Terminal Emulator.zip
WDS Terminal Emulator

Schematics/Layout (2)

Document NameDescriptionVersionUpdated
442x-DKDB1.zip
442x Schematics/Layout (50Ohm)5.0
442x-DKDB5.zip
442x Schematics/Layout (868 BIFA)4.2

Training (1)

Document NameDescriptionVersionUpdated
WDS-1-Radio-Control-Panel.swf
Wireless Development Suite — Radio Control Panel Wireless Development Suite — Radio Control Panel

 

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Product Matrix


Part Number Available DocumentsOutput Power 868 MHzOutput Power 434 MHzSupply VoltageSensitivityPackageFSKDescriptionOOKFrequency Bands
Si4420Sample
Buy
Data Sheet
2 dBm3 dBm2.2 - 5.4 V-TSSOP16256 kbpsTRX-315, 434, 868, 915 MHz
Si4421Sample
Buy
Data Sheet
7 dBm5 dBm2.2 - 3.8 V-TSSOP16115 kbpsTRX-434, 868, 915 MHz

​Note​: Supported for existing production, but not recommended for new designs. The Si4010 and Si4313 devices are recommended for new designs.

EZRadio Recommended Parts
​​
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Training & Resources

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