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PDF SI4020 Data sheet ( Hoja de datos )
| Número de pieza | SI4020 | |
| Descripción | Universal ISM Band FSK Transmitter | |
| Fabricantes | Silicon Laboratories | |
| Logotipo |  |
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Si4020 Universal ISM
Band FSK Transmitter
DESCRIPTION
Silicon Labs’ Si4020 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 315, 433, 868, and 915 MHz bands.
Used in conjunction with IA4320, Silicon Labs’ FSK receiver, the Si4020
transmitter feature 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 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 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 Si4020’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.
FUNCTIONAL BLOCK DIAGRAM
XTL
MOD
VDD
VSS
CRYSTAL
OSCILLATOR
LOW
BATTERY
DETECT
WAKE-UP
TIMER
REFERENCE
SYNTHESIZER
LOAD CAP
LOW BAT
TRESHOLD
CLOCK
FREQUENCY
LEVEL
OOK
CONTROLLER
TIMEOUT
PERIOD
RFP
RFN
nIRQ/nLBD
CLK/SDO
SDI
SCK
nSEL
FSK
PB1 PB2 PB3 PB4
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.
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 µA)
• 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
Si4020-DS Rev 1.9r 0308
1
www.silabs.com/integration
Free Datasheet http://www.datasheet4u.com/
1 page  
PACKAGE PIN DEFINITIONS, EEPROM MODE
Pin type key: D=digital, A=analog, S=supply, I=input, O=output, IO=input/output
EEPROM Mode Pin Assignment
Si4020
Pin Name
1 SDI
2 SCK
3 nSEL
4 PB1
5 PB2
6 PB3
7 PB4
8 SDO
9 XTL
10 VSS
11 MOD
12 RFN
13 RFP
14 nLBD
15 VDD
16 FSK
Type
DI
DO
DO
DI
DI
DI
DI
DO
AIO
S
DI
AO
AO
DO
S
DI
Function
Data input of serial control interface
Clock output of serial control interface
Chip select output of serial control interface (active low)
Push-button input #1 (active low with internal pull-up resistor)
Push-button input #2 (active low with internal pull-up resistor)
Push-button input #3 (active low with internal pull-up resistor)
Push-button input #4 (active low with internal pull-up resistor)
Data output of serial control interface
Crystal connection (other terminal of crystal to VSS)
Ground reference
Connect to logic low (EEPROM mode)
Power amplifier output (open collector)
Power amplifier output (open collector)
Low battery voltage detector output (active low)
Positive supply voltage
Not used, connect to VDD or VSS
5
Free Datasheet http://www.datasheet4u.com/
5 Page 
Modulated RF Spectrum
At 433 MHz with
180 kHz Deviation at 64 kbps
15:46:09 Oct 29, 2003
Ref -10 dBm
#Peak
Log
10
dB/
Atten 5 dB
Si4020
At 868 MHz with
180 kHz Deviation at 64 kbps
15:43:45 Oct 29, 2003
Ref -10 dBm
#Peak
Log
10
dB/
Atten 5 dB
VAvg
100
W1S2
S3 FC
AA
VAvg
100
W1S2
S3 FC
AA
Center 434 MHz
Res BW 10 kHz
VBW 100 kHz
Span 2 MHz Center 868 MHz
Sweep 20.07 ms (2001 pts) Res BW 10 kHz
VBW 100 kHz
Span 2 MHz
Sweep 20.07 ms (2001 pts)
Spurious RF Spectrum
With 10 MHz CLK Output Enabled at 433 MHz
Antenna Tuning Characteristics
750–970 MHz
16:29:03 Jun 17, 2003
p
Ref 0 dBm
#Peak
Log
10
dB/
Atten 10 dB
1R
Mkr1 ∆ 20.0 MHz
-55.11 dB
16:54:54 Mar 11, 2003
Ref -36 dBm
Peak
Log
1
dB/
#Atten 0 dB
1
Mkr1 915.0 MHz
-37.62 dBm
*
Marker ∆
20.000000 MHz
-55.11 dB
W1S2
S3 FC
AA
Marker
915.000000 MHz
-37.62 dBm
V1 M2
S3 FC
1 AA
Center 434.8 MHz
#Res BW 3 kHz
#VBW 300 Hz
Span 50 MHz Start 700 MHz
Sweep 45.47 s (401 pts) #Res BW 1 MHz
VBW 1 MHz
Stop 1.05 GHz
Sweep 50 ms (401 pts)
The antenna tuning characteristics was recorded in “max-hold” state of the spectrum analyzer. During the measurement, the
transmitters were forced to change frequencies by forcing an external reference signal to the XTL pin. While the carrier was changing
the antenna tuning circuit switched trough all the available states of the tuning circuit. The graph clearly demonstrates that while the
complete output circuit had about a 40 MHz bandwidth, the tuning allows operating in a 220 MHz band. In other words the tuning
circuit can compensate for 25% variation in the resonant frequency due to any process or manufacturing spread.
11
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet SI4020.PDF ] | |
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