Si4421 GENERAL DEVICE SPECIFICATIONS | Silicon Laboratories SI4421

Si4421

Si4421

GENERAL DEVICE SPECIFICATIONS

All voltages are referenced to Vss, the potential on the ground reference pin VSS.

Absolute Maximum Ratings (non-operating)

Symbol	Parameter	Min	Max	Units
Vdd	Positive supply voltage	-0.5	6	V
Vin	Voltage on any pin (except RF1 and RF2)	-0.5	Vdd +0.5	V
Voc	Voltage on open collector outputs (RF1, RF2)	-0.5	Vdd +1.5 (Note 1)	V
Iin	Input current into any pin except VDD and VSS	-25	25	mA
ESD	Electrostatic discharge with human body model		1000	V
Tst	Storage temperature	-55	125	oC
Tld	Lead temperature (soldering, max 10 s)		260	oC

Recommended Operating Range

Symbol	Parameter	Min
Vdd	Positive supply voltage	2.2
Voc	Voltage range on open collector outputs (RF1, RF2)	Vdd -1.5 (Note 2)
Top	Ambient operating temperature	-40

Max

3.8

Vdd +1.5 85

Units

V

V

oC

Note 1: The voltage on RF1 and RF2 pins can be higher than the actual Vdd but cannot exceed 7 V.

Note 2: The actual voltage on RF1 and RF2 pins can be lower than the current Vdd but never should go below 1.2 V.

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Silicon Laboratories SI4421 manual Si4421 GENERAL DEVICE SPECIFICATIONS, Absolute Maximum Ratings non-operating

Contents

FUNCTIONAL BLOCK DIAGRAM FEATURESDESCRIPTION TYPICAL APPLICATIONS DETAILED FEATURE-LEVELDESCRIPTION RF Power Amplifier PAData Filtering and Clock Recovery Si4421 Low Battery Voltage Detector Wake-UpTimerData Validity Blocks Crystal Oscillator Si4421 PACKAGE PIN DEFINITIONS NameType Function Si4421 Internal Pin ConnectionsName Internal connection PIN6 Logic Diagram FSK / DATA / nFFS PIN10 Logic Diagram nRES I/ONote These pins can be left floating Si4421 Si4421 Typical ApplicationRecommended supply decoupling capacitor values Pin Function vs. Operation Mode Recommended Operating Range Si4421 GENERAL DEVICE SPECIFICATIONSAbsolute Maximum Ratings non-operating Si4421 ELECTRICAL SPECIFICATIONDC Characteristics Si4421 AC Characteristics PLL parametersAC Characteristics Receiver Si4421 AC Characteristics TransmitterAC Characteristics Turn-on/Turnaroundtimings AC Characteristics Others Si4421 Note 10 By design Timing Diagram Si4421 CONTROL INTERFACETiming Specification Si4421 Control CommandsControl Register Default Values Description of the Control Commands Configuration Setting Command2. Power Management Command Si4421 Logic connections between power control bits Si4421 Frequency Setting Command 4. Data Rate Command5. Receiver Control Command Si4421 VDI Logic Diagram Si4421 6. Data Filter Command Si4421 7.FIFO and Reset Mode Command Si4421 8. Synchron Pattern Command 9. Receiver FIFO Read Command10. AFC Command Si4421 Si4421 Bit 5-4rl1 to rl0 Si4421 11. TX Configuration Control CommandFrequency Setting Command Si4421 13. Transmitter Register Write Command12. PLL Setting Command Si4421 14. Wake-UpTimer Command15.Low Duty-CycleCommand Vlb= 2.25 + V · 0.1 V Clock divider configuration Si4421 Bit Name 17. Status Read CommandSi4421 Si4421 INTERRUPT HANDLING TX REGISTER BUFFERED DATA TRANSMISSION Si4421 Si4421 Typical TX register usage Si4421 RX FIFO BUFFERED DATA READ RECOMMENDED PACKET STRUCTURES Si4421 CRYSTAL SELECTION GUIDELINES Bit Rate 2.4 kbpsBit Rate 9.6 kbps Bit Rate 38.4 kbps Si4421 RX-TXALIGNMENT PROCEDURES Si4421 RESET MODES Sensitive Reset Enabled, Ripple on Vdd FIFO and Reset Mode Command pageSW Reset Command Si4421 Si4421 TYPICAL PERFORMANCE CHARACTERISTICS Channel Selectivity and Blocking BER Curves in 868 MHz Band Si4421BER Curves in 433 MHz Band Si4421 434 MHz Si4421 REFERENCE DESIGNS SchematicsEvaluation Board with 50 Ohm Matching Network Frequency Dependent Component Values Si4421 PCB Layout Top View Bottom View Schematics Si4421Evaluation Board with Resonant PCB Antenna BIFA Frequency Dependent Component Values Top View Bottom View Si4421PCB Layout Antenna designed for 868/915 MHz band See Detail “A” Section B-B Si4421 PACKAGE INFORMATION16-pinTSSOP RELATED PRODUCTS AND DOCUMENTS Si4421 Universal ISM Band FSK TransceiverDemo Boards and Development Kits Related Resources Si4421