SILABS SI4431

Si4432/31/30
ISM Transceiver
Description
Features
Silicon Laboratories’ Si4432/31/30 highly-integrated, single chip
wireless ISM transceiver is part of the EZRadioPRO™ family. The
EZRadioPRO family includes a complete line of transmitters,
receivers, and transceivers allowing the RF system designer to
choose the optimal wireless part for their application.
The Si4432/31 offers advanced radio features, including
continuous frequency coverage from 240–930 MHz and
adjustable output power of up to +20 dBm with the Si4432. The
Si4430 offers frequency coverage from 900 to 960 MHz to support
the Japanese frequency bands. The Si4432/31/30’s high level of
integration offers reduced BOM cost while simplifying overall
system design. The extremely low receive sensitivity (–118 dBm)
coupled with the Si4432’s industry-leading +20 dBm output power
ensures extended range and improved link performance. Built-in
antenna diversity and support for frequency hopping can be used
to further extend range and enhance performance. Antenna
diversity is completely integrated into the Si443x and can improve
the system link budget by 8–10 dB, resulting in substantial range
increases under adverse environmental conditions.
Additional system features, such as an automatic wake-up timer,
low battery detector, 64 byte TX/RX FIFOs, automatic packet
handling, and preamble detection, reduce overall current
consumption and allow the use of lower-cost system MCUs. An
integrated temperature sensor, general-purpose ADC, power-onreset (POR), and GPIOs further reduce overall system cost and
size.
The Si4432/31/30 receiver uses a single-conversion architecture
to convert the 2-level FSK/GFSK/OOK modulated receive signal to
a low IF frequency. Following a programmable gain amplifier
(PGA) the signal is converted to the digital domain by a highperformance delta-sigma ADC allowing filtering, demodulation,
slicing, error correction, and packet handling to be performed in
the built-in DSP, increasing the receiver’s performance and
flexibility versus analog based architectures.
The PA is single-ended to allow for easy antenna matching and
low BOM cost. The digital transmit modulation and automatic PA
power ramping ensure precise transmit modulation and reduced
spectral splatter, ensuring compliance with FCC and ETSI
regulations. The Si4430 is designed to ensure compliance with
ARIB regulations. The Si4432/31/30 is designed to work with an
MCU, crystal, and a few passives to create a very low-cost
system. Voltage regulators are integrated on-chip, which allows for
a wide range of operating supply voltage conditions from +1.8 to
+3.6 V.
- Frequency Range = 240–930 MHz (Si4432/31)
+13 dBm (Si4431/30)
- Low Power Consumption
- 18.5 mA receive
- 27 mA @ +11 dBm transmit
- Data Rate = 1 to 128 kbps
- Power Supply = 1.8 to 3.6 V
- Ultra low power shutdown mode
- Wake-up timer
- Auto-frequency calibration (AFC)
- Antenna diversity and TR switch control
- Programmable packet handler
- TX and RX 64 byte FIFOs
- Low battery detector
- Temperature sensor and 8-bit ADC
- Frequency hopping capability
- On-chip crystal tuning
- 20-Pin QFN package
- Low BOM
Applications
-
Remote control
Home security and alarm
Telemetry
Toy control
Remote meter reading
Remote keyless entry
Home automation
Industrial control
Sensor networks
Health monitors
nSEL
Xin
VDD_DIG
RC 32K OSC
RF LDO
Xout
Tag readers
SDN
VDD_RF
900–960 MHz (Si4430)
- Sensitivity = –118 dBm
- FSK, GFSK, and OOK modulation
- Max Output Power = +20 dBm (Si4432)
PLL LDO
VCO LDO
VCO
LPF
CP
30M XTAL
OSC
PFD
LBD
TX
PA
Temp
Sensor
PA_RAMP
PWR_CTRL
N
8Bit
ADC
Delta Sigma
Modulator
ANTDIV
TXRXSW
PA_RAMP
PWR_CTRL
TXMOD
Digital Logic
SCLK
SDI
SDO
VDD_DIG
SPI, & Controller
Digital Modem
AGC Control
Low Power
Digital LDO
Digital LDO
RFp
ADC
RFn
POR
LNA
EZRadioPRO
BIAS
PGA
Copyright © 2009 by Silicon Laboratories
VR_DIG
IF LDO
VR_IF
GPIO_0
GPIO_1
GPIO_2
Mixers
2.20.09
Si4432/31/30
ISM Transceiver
Selected Electrical Specifications
Parameter
Supply Voltage Range
Symbol
Vdd
IShutdown
IStandby
Power Saving Modes
ISleep
RX Mode Current
Test Condition
RC Oscillator, Main Digital Regulator,
and Low Power Digital Regulator OFF
Register values retained, Main Digital
Regulator and RC Oscillator OFF
RC Oscillator ON,
Register values retained, Main Digital
Regulator OFF
Min
1.8
Typ
3.0
Max
3.6
Unit
V
—
10
—
nA
—
400
—
nA
—
800
—
nA
—
18.5
—
mA
ITX_+20
txpow[2:0] = 011 (+20 dBm),
VDD = 3.3 V
—
80
—
mA
ITX_+11
txpow[2:0] = 000 (+11 dBm),
VDD = 3.3 V
—
27
—
mA
ITX_+13
txpow[2:0] = 111 (+13 dBm),
VDD = 3.3 V
—
28
—
mA
IRX
TX Mode Current (Si4432)
TX Mode Current (Si4430/31)
Synthesizer Frequency Range
(Si4432/31)
FSYNTH-LB
FSYNTH-HB
txpow[2:0] = 100 (+1 dBm),
VDD = 3.3 V
Low Band
High Band
Synthesizer Frequency Range
(Si4430)
FSYNTH-HB
High Band
900
—
960
MHz
FRES-LB
FRES-HB
Low Band
High Band
(BER < 0.1%)
(2 kbps, GFSK, BT = 0.5,
f = 5 kHz)2
—
—
156.25
312.5
—
—
Hz
Hz
—
–118
—
dBm
ITX_+1
Synthesizer Frequency
Resolution
RX Sensitivity
PRX_2
—
16
—
mA
240
480
—
—
480
930
MHz
MHz
RX Bandwidth
BW
2.6
—
620
kHz
Output Power Range (Si4432)
PTX
Power control by txpow[2:0] Register
11
—
20
dBm
PTX
Power control by txpow[2:0] Register
–8
—
13
dBm
PRF_OUT
Controlled by txpow[2:0] Register
—
3
—
dB
85
°C
Output Power Range (Si4431/30)
TX RF Output Steps
Operating Ambient Temperature
Range
20-pin QFN Package Information
nIRQ
nSEL
XOUT
XIN
Pin Assignments
SDN
–40
TA
20 19 18 17 16
14
SDI
RXp
3
13
SDO
RXn
4
12
VDD_DIG
VR_IF
5
11
NC
6
7
8
9 10
EZRadioPRO
VDR
Metal
Paddle
GPIO_2
SCLK
2
GPIO_1
15
TX
NC
1
GPIO_0
VDD_RF
Copyright © 2009 by Silicon Laboratories
Silicon Laboratories and Silicon Labs are trademarks of Silicon Laboratories Inc.
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2.20.09