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4021-DKDB7

Description
series 发射器 For Use With Si4021
CategoryTopical application    Wireless rf/communication   
File Size2MB,35 Pages
ManufacturerSilicon Labs
Websitehttps://www.silabs.com
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4021-DKDB7 Overview

series 发射器 For Use With Si4021

4021-DKDB7 Parametric

Parameter NameAttribute value
category
MakerSilicon Labs
seriesEZRadio®
Packagebox
\u96F6\u4EF6\u72B6\u6001\u505C\u4EA7
typelauncher
frequency868MHz,915MHz
Supporting use/related productsSi4021
What's includedplate
Si4021 Universal ISM
Band FSK Transmitter
DESCRIPTION
Silicon Labs’ Si4021 is a single chip, low power, multi-channel FSK
transmitter designed for use in applications requiring FCC or ETSI
conformance for unlicensed use in the 433, 868, and 915 MHz bands.
Used in conjunction with Si4020, Silicon Labs’ FSK receiver, the Si4021
transmitter features EZRadioTM 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 Si4021 builds on
the features presented by the Si4020 by offering a higher output power
and an improved phase noise characteristic. The Si4021 shares the same
pinout and control command set as the Si4020. The Si4021 offers all of
the frequencies as the Si4020, with the exception of the 315 MHz band.
The Si4021 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 115.2 kbps. The PLL’s
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 Si4021’s 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.
SDI
SCK
nSEL
PB1
PB2
PB3
PB4
CLK
1
2
3
4
5
6
7
8
Si4021
PIN ASSIGNMENT
16
15
14
13
12
11
10
9
FSK
VDD
nIRQ
RFP
RFN
MOD
VSS
XTL
SDI
SCK
nSEL
PB1
PB2
PB3
PB4
SDO
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
FSK
VDD
nLBD
RFP
RFN
MOD
VSS
XTL
Microcontroller Mode
EEPROM Mode
This document refers to Si4021-IC Rev A1.
See www.silabs.com/integration for any applicable
errata. See back page for ordering information.
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
Programmable PLL loop bandwidth
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
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 µA)
Compact 16-pin TSSOP package
Transmit bit synchronization
FUNCTIONAL BLOCK DIAGRAM
CRYSTAL
OSCILLATOR
REFERENCE
RFP
SYNTHESIZER
RFN
XTL
CLOCK
FREQUENCY
LOAD CAP
MOD
LOW
BATTERY
DETECT
LOW BAT
LEVEL
OOK
nIRQ/nLBD
CLK/SDO
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
TRESHOLD
CONTROLLER
SDI
SCK
VDD
VSS
TIMEOUT
WAKE-UP
TIMER
PERIOD
nSEL
FSK
PB1 PB2 PB3 PB4
1
Si4021-DS Rev 2.3r 0408
www.silabs.com/integration
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