Si4468/7
H
I G H
- P
ERFORMANCE
, L
O W
-C
U R R E N T
T
RANSCEIVER
Features
Frequency range = 142–1050 MHz
Receive sensitivity = –133 dBm @
100 bps plus fast-scanning AFC for
standard TCXO applications
Modulation
(G)FSK, 4(G)FSK, (G)MSK
OOK
Max output power
+20 dBm (Si4468)
+13 dBm (Si4467)
PA support for +27 or +30 dBm
Low active power consumption
10/13 mA RX
18 mA TX at +10 dBm (Si4467)
Ultra low current powerdown modes
30 nA shutdown, 40 nA standby
Preamble sense mode
6 mA average RX current at
1.2 kbps
10 µA average RX current at
50 kbps and 1 sec sleep interval
Fast preamble detection
1 byte preamble detection
Data rate = 100 bps to 1 Mbps
Fast wake and hop times
Power supply = 1.8 to 3.8 V
Excellent selectivity performance
69 dB adjacent channel
79 dB blocking at 1 MHz
Antenna diversity and T/R switch control
Highly configurable packet handler
TX and RX 64 byte FIFOs
129 bytes dedicated Tx or Rx FIFO
Auto frequency control (AFC)
Automatic gain control (AGC)
Low BOM
Low battery detector
Temperature sensor
20-Pin QFN package
Sub-GHz 802.15.4 mesh network ready
IEEE
802.15.4g, and WMBus compliant
Suitable for FCC Part 90 Mask D, FCC
part 15.247, 15,231, 15,249, ARIB T-108,
T-96, T-67, RCR STD-30, China
regulatory
ETSI Category I Operation
EN 300 220
Pin Assignments
GPIO3
GPIO2
XOUT
16
15 nSEL
14 SDI
13 SDO
12 SCLK
7
TXRamp
8
VDD
9
GPIO0
10
GPIO1
11 nIRQ
GND
18
XIN
17
SDN
1
20
19
RXp 2
RXn 3
Applications
Smart metering (802.15.4g and WMBus)
802.15.4 mesh networking
Home security and alarm
Telemetry
Garage and gate openers
Star and point-to-point networks
Home automation
Ultra narrowband, long range
applications
Industrial control
Sensor networks
Health monitors
Electronic shelf labels
Low power wireless sensor
nodes
TX 4
NC 5
6
VDD
GND
PAD
Description
Silicon Laboratories' Si446x devices are high-performance, low-current
transceivers covering the sub-GHz frequency bands from 142 to 1050 MHz. The
radios are part of the EZRadioPRO
®
family, which includes a complete line of
transmitters, receivers, and transceivers covering a wide range of applications. A
high level of integration including support for IEEE 802.15.4 features enables
standards based sub GHz networking solutions. All parts offer outstanding
sensitivity of –133 dBm while achieving extremely low active and standby current
consumption. The Si4468/7 offers frequency coverage in all major bands. The
Si446x includes optimal phase noise, blocking, and selectivity performance for
narrow band and licensed band applications, such as FCC Part90 and 169 MHz
wireless MBus. The 69 dB adjacent channel selectivity with 12.5 kHz channel
spacing ensures robust receive operation in harsh RF conditions, which is
particularly important for narrow band operation. The Si4468 offers exceptional
output power of up to +20 dBm with outstanding TX efficiency. The high output
power and sensitivity results in an industry-leading link budget of 155 dB allowing
extended ranges and highly robust communication links. The Si4467 active mode
TX current consumption of 18 mA at +10 dBm and RX current of 10 mA coupled
with extremely low standby current and fast wake times ensure extended battery
life in the most demanding applications. The Si4468 can achieve up to +27 dBm
output power with built-in ramping control of a low-cost external FET. The devices
can meet worldwide regulatory standards: FCC, ETSI, and ARIB. All devices are
designed to be compliant with 802.15.4g and WMBus smart metering standards.
The devices are highly flexible and can be configured via the Wireless
Development Suite (WDS) available at
www.silabs.com.
Patents pending
Rev 1.0 10/14
Copyright © 2014 by Silicon Laboratories
Si4468/7
Si4468/7
Functional Block Diagram
GPIO3 GPIO2
Loop
Filter
VCO
FBDIV
TX DIV
SDN
RF
PKDET
LNA
PGA
LO
Gen
IF
PKDET
MODEM
FIFO
Packet
Handler
nSEL
SDI
SDO
SCLK
nIRQ
SPI Interface
Controller
Frac-N Div
30 MHz XO
Bootup
OSC
PFD / CP
XIN XOUT
RXP
RXN
ADC
TX
PA
PowerRamp
Cntl
PA
LDO
LDOs
POR
LBD
32K LP
OSC
VDD
Digital
Logic
TXRAMP
GPIO0 GPIO1
Product
Si4468
Si4467
Freq. Range
Major bands
142–1050 MHz
Major bands
142–1050 MHz
Max Output Power
+20 dBm
+13 dBm
Ultra Narrow Band
Support
IEEE 802.15.4 / 4g
Ready
2
Rev 1.0
Si4468/7
T
ABLE O F
C
ONTENTS
Section
Page
1. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
2. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
2.1. Boot Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
3. Controller Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
3.1. Serial Peripheral Interface (SPI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
3.2. Fast Response Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
3.3. Operating Modes and Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
3.4. Application Programming Interface (API) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
3.5. Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
3.6. GPIO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
4. Modulation and Hardware Configuration Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
4.1. Modulation Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
4.2. Hardware Configuration Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
4.3. Preamble Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
5. Internal Functional Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
5.1. RX Chain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
5.2. RX Modem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
5.3. Synthesizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
5.4. Transmitter (TX) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
5.5. Crystal Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
6. Data Handling and Packet Handler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
6.1. RX and TX FIFOs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
6.2. Packet Handler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
7. RX Modem Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
8. Auxiliary Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
8.1. Wake-up Timer and 32 kHz Clock Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
8.2. Low Duty Cycle Mode (Auto RX Wake-Up) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
8.3. Temperature, Battery Voltage, and Auxiliary ADC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
8.4. Low Battery Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
8.5. Antenna Diversity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
8.6. Preamble Sense Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
9. Standards Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
9.1. Wireless MBus Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
9.2. ETSI EN300 220 Category 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
9.3. IEEE 802.15.4 Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
10. Packet Trace Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
11. Pin Descriptions: Si4468/7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
12. Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
13. Package Outline: Si4468/7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
14. PCB Land Pattern: Si4468/7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
15. Top Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
15.1. Si4468/7 Top Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
15.2. Top Marking Explanation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
Document Change List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
Rev 1.0
3
Si4468/7
1. Electrical Specifications
Table 1. DC Characteristics
1
Parameter
Supply Voltage
Range
Symbol
V
DD
RC Oscillator, Main Digital Regulator,
and Low Power Digital Regulator OFF
Register values maintained and RC
oscillator/WUT OFF
RC Oscillator/WUT ON and all register values main-
tained, and all other blocks OFF
Sleep current using an external 32 kHz crystal
Low battery detector ON, register values maintained,
and all other blocks OFF
Crystal Oscillator and Main Digital Regulator ON,
all other blocks OFF
Duty cycling during preamble search,
1.2 kbps, 4 byte preamble (no sensitivity degradation)
Fixed 1 s wakeup interval, 50 kbps, 5 byte preamble
RX Tune, High Performance Mode
TX Tune, High Performance Mode
High Performance Mode
Measured at 915 MHz and 40 kbps data rate.
Low Power Mode Measured at 315 MHz and 40 kbps
data
+20 dBm output power, Class-E match,
915 MHz, 3.3 V
+20 dBm output power, square-wave match,
169 MHz, 3.3 V
+13 dBm output power, Class-E match,
915 MHz, 3.3 V
TX Mode Current
(Si4467)
I
TX_+10
I
TX_+10
I
TX_+13
+10 dBm output power, Class-E match,
915/868 MHz, 3.3 V
2
+10 dBm output power, Class-E match,
169 MHz, 3.3 V
2
+13 dBm output power, Class-E match,
915/868 MHz, 3.3 V
Test Condition
Min
1.8
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Typ
3.3
30
40
Max
3.8
1300
2900
Unit
V
nA
nA
nA
µA
µA
mA
mA
µA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
Power Saving Modes I
Shutdown
I
Standby
I
SleepRC
I
SleepXO
I
Sensor
-LBD
740 3800
1.7
1
1.8
6
10
7.6
7.8
13.7
10.9
88
68.5
44.5
19.7
18
24
—
—
—
—
—
—
—
22
—
108
80
60
—
—
—
I
Ready
Preamble Sense
Mode Current
TUNE Mode Current
RX Mode Current
I
psm
I
psm
I
Tune_RX
I
Tune_TX
I
RXH
I
RXL
TX Mode Current
(Si4468)
I
TX_+20
Notes:
1.
All minimum and maximum values are guaranteed across the recommended operating conditions of supply voltage and
from –40 to +85 °C unless otherwise stated. All typical values apply at V
DD
= 3.3 V and 25 °C unless otherwise stated.
2.
Measured on direct tie RF evaluation board.
4
Rev 1.0
Si4468/7
Table 2. Synthesizer AC Electrical Characteristics
Parameter
Synthesizer Frequency
Range
Symbol
F
SYN
Test Condition
Min
850
350
284
142
Synthesizer Frequency
Resolution
F
RES-960
F
RES-525
F
RES-420
F
RES-350
F
RES-175
Synthesizer Settling Time
t
LOCK
850–1050 MHz
420–525 MHz
350–420 MHz
283–350 MHz
142–175 MHz
Measured from exiting Ready mode with
XOSC running to any frequency.
Including VCO Calibration.
F
= 10 kHz, 169 MHz, High Perf Mode
F
= 100 kHz, 169 MHz, High Perf Mode
F
= 1 MHz, 169 MHz, High Perf Mode
F
= 10 MHz, 169 MHz, High Perf Mode
F
= 10 kHz, 915 MHz, High Perf Mode
F
= 100 kHz, 915 MHz, High Perf Mode
F
= 1 MHz, 915 MHz, High Perf Mode
F
= 10 MHz, 915 MHz, High Perf Mode
—
—
—
—
—
—
Typ
—
—
—
—
28.6
14.3
11.4
9.5
4.7
50
Max
1050
525
350
175
—
—
—
—
—
—
Unit
MHz
MHz
MHz
MHz
Hz
Hz
Hz
Hz
Hz
µs
Phase Noise
L(f
M
)
—
—
—
—
—
—
—
—
–117
–120
–138
–148
–102
–105
–125
–138
–108 dBc/Hz
–115 dBc/Hz
–135 dBc/Hz
–143 dBc/Hz
–94
–97
dBc/Hz
dBc/Hz
–122 dBc/Hz
–135 dBc/Hz
Note:
All minimum and maximum values are guaranteed across the recommended operating conditions of supply voltage and
from –40 to +85 °C unless otherwise stated. All typical values apply at V
DD
= 3.3 V and 25 °C unless otherwise stated.
Rev 1.0
5
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