Si4420 Universal ISM
Si4420
Band FSK Transceiver
PIN ASSIGNMENT
DESCRIPTION
nINT / VDI
SDI
Silicon Labs’ Si4420 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 315, 433, 868 and 915 MHz
bands. The Si4420 transceiver is a part of Silicon Labs’ EZRadioTM product
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.
SCK
nSEL
SDO
ARSSI
VDD
RF1
RF2
nIRQ
FSK / DATA / nFFS
DCLK / CFIL / FFIT
CLK
VSS
nRES
XTL / REF
Rev C and later
This document refers to Si4420-IC Rev D1.
See www.silabs.com/integration for any applicable
errata. See back page for ordering information.
The Si4420 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.
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
in analog mode)
The Si4420 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 register. The
automatic frequency control (AFC) feature allows the use of a low accuracy
(low cost) crystal. To minimize the system cost, the Si4420 can provide a
clock signal for the microcontroller, avoiding the need for two crystals.
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
For low power applications, the Si4420 supports low duty cycle operation
based on the internal wake-up timer.
FUNCTIONAL BLOCK DIAGRAM
Two 8 bit TX data registers
Low power duty cycle mode
Standard 10 MHz crystal reference
Wake-up timer
MIX
I
DCLK /
CFIL /
FFIT /
AMP
OC
7
6
clk
13
12
RF1
RF2
Data Filt
CLK Rec
I/Q
DEMOD
Self cal.
OC
FSK /
DATA /
nFFS
LNA
data
MIX
Q
AMP
PA
2.2 to 5.4 V supply voltage
FIFO
Low power consumption
Low standby current (0.3 A)
RSSI
PLL & I/Q VCO
with cal.
COMP
DQD
AFC
RF Parts
BB Amp/Filt./Limiter
Data processing units
Compact 16 pin TSSOP package
WTM
with cal.
CLK div
Xosc
LBD
Low Power parts
Controller
Bias
TYPICAL APPLICATIONS
Remote control
Home security and alarm
Wireless keyboard/mouse and other PC peripherals
Toy controls
8
9
15
1
2
5
10
16
3
4
11
14
CLK
VDD
XTL /
REF
ARSSI SDI
SCK nSEL SDO
nIRQ nRES nINT /
VDI
VSS
Remote keyless entry
Tire pressure monitoring
Telemetry
Remote automatic meter reading
1
Si4420-DS Rev 1.7r 0308
www.silabs.com
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