EZLC-4421 HB Silicon Laboratories Inc, EZLC-4421 HB Datasheet

EZLC-4421 HB

Manufacturer Part Number

EZLC-4421 HB

Description

Wireless Accessories EZLink Fast Prototype Kit Hiband

Manufacturer

Silicon Laboratories Inc

Datasheet

1.EZLC-4421_HB.pdf (45 pages)

Specifications of EZLC-4421 HB

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

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Si4421 Universal ISM Band

FSK Transceiver

DESCRIPTION

Silicon Labs’ Si4421 is a single chip, low power, multi-channel FSK

transceiver designed for use in applications requiring FCC or ETSI

conformance for unlicensed use in the 433, 868 and 915 MHz bands.

The Si4421 transceiver is a part of Silicon Labs’ EZRadio

line, which produces a flexible, low cost, and highly integrated solution

that does not require production alignments. The chip is a complete

analog RF and baseband transceiver including a multi-band PLL

synthesizer with PA, LNA, I/Q down converter mixers, baseband filters

and amplifiers, and an I/Q demodulator. All required RF functions are

integrated. Only an external crystal and bypass filtering are needed for

operation.

The Si4421 features a completely integrated PLL for easy RF design,

and its rapid settling time allows for fast frequency-hopping, bypassing

multipath fading and interference to achieve robust wireless links. The

PLL’s high resolution allows the usage of multiple channels in any of

the bands. The receiver baseband bandwidth (BW) is programmable to

accommodate various deviation, data rate and crystal tolerance

requirements. The transceiver employs the Zero-IF approach with I/Q

demodulation. Consequently, no external components (except crystal

and decoupling) are needed in most applications.

The Si4421 dramatically reduces the load on the microcontroller with

the integrated digital data processing features: data filtering, clock

recovery, data pattern recognition, integrated FIFO and TX data

of a low accuracy (low cost) crystal. To minimize the system cost, the

Si4421 can provide a clock signal for the microcontroller, avoiding the

need for two crystals.

For low power applications, the Si4421 supports low duty cycle

operation based on the internal wake-up timer.

FUNCTIONAL BLOCK DIAGRAM

Si4421-DS rev 2.4r 0708

RF1

RF2 12

RF Parts

CLK div

CLK

LNA

PLL & I/Q VCO

with cal.

Xosc

XTL /

REF

MIX

with cal.

WTM

BB Amp/Filt./Limiter

AMP

Low Power parts

Self cal.

LBD

RSSI

ARSSI

SDI

COMP

SCK

DEMOD

I/Q

nSEL SDO

DQD

Controller

nIRQ

AFC

nRES

nINT /

VDI

Data Filt

CLK Rec

FIFO

Data processing units

VSS VDD

data

Bias

clk

product

DCLK /

CFIL /

FFIT /

FSK /

DATA /

nFFS

FEATURES

 Fully integrated (low BOM, easy design-in)

 No alignment required in production

 Fast-settling, programmable, high-resolution PLL synthesizer

 Fast frequency-hopping capability

 High bit rate (up to 115.2 kbps in digital mode and 256 kbps

 Direct differential antenna input/output

 Integrated power amplifier

 Programmable TX frequency deviation (15 to 240 kHz)

 Programmable RX baseband bandwidth (67 to 400 kHz)

 Analog and digital RSSI outputs

 Automatic frequency control (AFC)

 Data quality detection (DQD)

 Internal data filtering and clock recovery

 RX synchron pattern recognition

 SPI compatible serial control interface

 Clock and reset signals for microcontroller

 16-bit RX Data FIFO

 Two 8-bit TX data registers

 Low power duty cycle mode

 Standard 10 MHz crystal reference with on-chip tuning

 Wake-up timer

 2.2 to 3.8 V supply voltage

 Low power consumption

 Low standby current (0.3 A)

 Compact 16 pin TSSOP package

 Supports very short packets (down to 3 bytes)

 Excellent temperature stability of the RF parameters

 Good adjacent channel rejection/blocking

TYPICAL APPLICATIONS

 Home security and alarm

 Remote control, keyless entry

 Wireless keyboard/mouse and other PC peripherals

 Toy controls

 Remote keyless entry

 Tire pressure monitoring

 Telemetry

 Personal/patient data logging

 Remote automatic meter reading

in analog mode)

See www.silabs.com/integration for any applicable errata.

This document refers to Si4421-IC rev A1.

See back page for ordering information.

PIN ASSIGNMENT

Si4421

www.silabs.com

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