SI4020-I1-FT【PDF 1/32 页】IC TX FSK 915MHZ 5.4V 16-TSSOP

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Si4020-DS Rev 1.9r 0308

www.silabs.com/integration

Si4020

PIN ASSIGNMENT

Microcontroller Mode

EEPROM Mode

This document refers to Si4020-IC Rev I1.

See www.silabs.com/integration for any applicable

errata. See back page for ordering information.

Si4020 Universal ISM

Band FSK Transmitter

DESCRIPTION

Silicon Labs Si4020 is a single chip, low power, multi-channel FSK

ransmitter designed for use in applications requiring FCC or ETSI

conformance for unlicensed use in the 315, 433, 868, and 915 MHz bands.

Used in conjunction with IA4320, Silicon Labs FSK receiver, the Si4020

transmitter feature EZRadio

technology, which produces a flexible, low

cost, and highly integrated solution that does not require production

alignments. All required RF functions are integrated. Only an external crystal

and bypass filtering are needed for operation.

The Si4020 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. In addition, highly

stable and accurate FSK modulation is accomplished by direct closed-loop

modulation with bit rates up to 256 kbps. The PLLs high resolution allows

the use of multiple channels in any of the bands.

The integrated power amplifier of the transmitter has an open-collector

differential output that directly drive a loop antenna with programmable

output level. No additional matching network is required. An automatic

antenna tuning circuit is built in to avoid costly trimming procedures and de-

tuning due to the hand effect.

For low-power applications, the device supports automatic activation from

sleep mode. Active mode can be initiated by several wake-up events (on-chip

timer timeout, low supply voltage detection, or activation of any of the four

push-button inputs).

The Si4020s on-chip digital interface supports both a microcontroller mode

and an EEPROM mode. The latter allows complete data transmitter

operation without a microcontroller (both control commands and data are

read from the EEPROM). Any wake-up event can start a transmission of the

corresponding data stored in the EEPROM.

FUNCTIONAL BLOCK DIAGRAM

CRYSTAL

OSCILLATOR

SYNTHESIZER

LOW

BATTERY

DETECT

WAKE-UP

TIMER

CONTROLLER

REFERENCE

LOAD CAP

LOW BAT

TRESHOLD

TIMEOUT

PERIOD

CLOCK

FREQUENCY

LEVEL

RFP

RFN

nIRQ/nLBD

CLK/SDO

SDI

SCK

nSEL

FSK

PB4

PB3

PB2

PB1

VSS

VDD

MOD

XTL

OOK

FEATURES

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

" No alignment required in production

" Fast settling, programmable, high-resolution PLL

" Fast frequency hopping capability

" Stable and accurate FSK modulation with programmable

deviation

" High bit rate (up to 256 kbps)

" Direct loop antenna drive

" Automatic antenna tuning circuit

" Programmable output power level

" Alternative OOK support

" EEPROM mode supported

" SPI bus for applications with microcontroller

" Clock output for microcontroller

" Integrated programmable crystal load capacitor

" Power-saving sleep mode

" Multiple event handling options for wake-up activation

" Push-button event handling with switch de-bounce

" Wake-up timer

" Low battery detection

" 2.2 to 5.4 V supply voltage

" Low power consumption

" Low standby current (0.3 礎)

" Compact 16-pin TSSOP package

TYPICAL APPLICATIONS

" Remote control

" Home security and alarm

" Wireless keyboard/mouse and other PC peripherals

" Toy control

" Remote keyless entry

" Tire pressure monitoring

" Telemetry

" Personal/patient data logging

" Remote automatic meter reading

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