BRD4502D Reference Manual

Reference Manual
BRD4502D (Rev. A00)
The EZR32WG family of Wireless MCUs deliver a high performance, low energy wireless solution integrated into a small form factor package. By combining a high performance sub-GHz RF transceiver
with an energy efficient 32-bit MCU, the family provides designers the ultimate in flexibility with a family of pin-compatible devices that scale from 64/128/256 kB of flash and support Silicon Labs EZRadio
or EZRadioPRO transceivers. The ultra-low power operating modes and fast wake-up times of the
Silicon Labs energy friendly 32-bit MCUs, combined with the low transmit and receive power consumption of the sub-GHz radio, result in a solution optimized for battery powered applications.
To develop and/or evaluate the EZR32 Wonder Gecko the EZR32WG Radio Board can
be connected to the Wireless Starter Kit Mainboard to get access to display, buttons and
additional features from Expansion Boards.
RADIO BOARD FEATURES
• Wireless MCU: EZR32WG330F256R55G
• CPU core: ARM Cortex-M4
• Flash memory: 256 kB
• RAM: 32 kB
• Sub-GHz transceiver integrated in the
Wireless MCU: EZRadioPRO
• Operation frequency: 434 MHz
• Transmit power: 10 dBm
• Single antenna connector both for transmit
and receive
• Crystals for LFXO and HFXO: 32.768kHz
and 48 MHz.
• Crystal for RF: 30 MHz
• Backup Power Domain Capacitor
• Full speed USB 2.0 (12 Mbps)
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Rev. 1.10
BRD4502D (Rev. A00)
Table of Contents
1. Radio Board Connector Pin Associations. . . . . . . . . . . . . . . . . . . . . 1
2. EZR32WG330 System-on-Chip Summary . . . . . . . . . . . . . . . . . . . . . 2
2.1 EZR32 Wireless MCU .
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2.2 EZRadio RF Transceiver .
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2.3 Communcation Between the MCU and the Radio .
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3. EZR32WG Radio Board block description
3.1 USB .
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3.2 RF Crystal Oscillator
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3.3 LF Crystal Oscillator (LFXO) .
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3.4 HF Crystal Oscillator (HFXO) .
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3.5 Backup Power Domain Capacitor .
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3.6 RF Matching Network .
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3.7 SMA connector
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3.8 Radio Board Connectors .
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4. RF section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.1 Matching network.
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5. Mechanical details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6. RF performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6.1 Measurement setup .
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6.2 Conducted Power Measurements .
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6.3 Radiated Power Measurements .
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7. Document Revision History . . . . . . . . . . . . . . . . . . . . . . . . . 12
8. Errata
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Table of Contents
ii
BRD4502D (Rev. A00)
Radio Board Connector Pin Associations
1. Radio Board Connector Pin Associations
The board-to-board connector scheme allows access to all EZR32WG GPIO pins as well as the nRESET signal. The figure below
shows the pin mapping on the connector to the radio pins, and their function on the Wireless Starter Kit Mainboard. For more information on the functions of the available pin functions, we refer you to the EZR32WG330 Datasheeet.
Figure 1.1. EZR32WG Radio Board Radio Board Connector pin mapping
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BRD4502D (Rev. A00)
EZR32WG330 System-on-Chip Summary
2. EZR32WG330 System-on-Chip Summary
The EEZR32WG330 Wireless MCU is a single-chip solution that combines an Wonder Gecko family MCU solution with an integrated
EZRadio or EZRadioPRO sub-GHz RF transceiver. These products are designed to address the specific requirements of low-power
embedded systems requiring an RF bidirectional communication link.
The block diagram of the EZR32WG330 is shown in the figure below.
Figure 2.1. EZR32WG330 block diagram
For a complete feature set and in-depth information on the modules, the reader is referred to the EZR32WG330 Reference Manual
2.1 EZR32 Wireless MCU
The EZR32 Wireless MCU are the world’s most energy friendly Wireless Microcontroller. With a unique combination of the powerful 32bit ARM Cortex-M4, innovative low energy techniques, short wake-up time from energy saving modes, and a wide selection of peripherals, the EZR32 WG is well suited for any battery operated application as well as other systems requiring high performance and lowenergy consumption.
2.2 EZRadio RF Transceiver
The EZR32WG family of devices is built using high-performance, low-current EZRadio and EZRadioPRO RF transceivers covering the
sub-GHz frequency bands from 142 to 1050 MHz. These devices offer outstanding sensitivity of up to –133 dBm (using EZRadioPRO)
while achieving extremely low active and standby current consumption. The EZR32WG devices using the transceiver offer frequency
coverage in all major bands and include optimal phase noise, blocking, and selectivity performance for narrow band and licensed band
applications, such as FCC Part 90 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 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 is
optimized for extended battery life in the most demanding applications. The EZR32WG devices 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 programmed and configured via Simplicity Studio, available at www.silabs.com.
For a complete feature set and in-depth information on the modules, the reader is referred to the Data Sheet "Si4x55-C Easy-to-Use,
Low-Current OOK/(G)FSK Sub-GHz Transceiver, Transmitter, and Receiver".
2.3 Communcation Between the MCU and the Radio
Communication between the radio and MCU are done over USART, PRS and IRQ, which requires the pins to be configured in the following way:
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BRD4502D (Rev. A00)
EZR32WG330 System-on-Chip Summary
Table 2.1. Radio MCU Communication Configuration
pin
Radio Assignment
pin function assignment
PE8
SDN
GPIO Output
PE9
nSEL
Bit-Banged SPI.CS (GPIO Output)
PE10
SDI
US0_TX #0
PE11
SDO
US0_RX #0
PE12
SCLK
US0_CLK #0
PE13
nIRQ
GPIO_EM4WU5 (GPIO Input with IRQ enabled)
PE14
GPIO1
PRS Input
PA15
GPIO0
PRS Input
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BRD4502D (Rev. A00)
EZR32WG Radio Board block description
3. EZR32WG Radio Board block description
The block diagram of the EZR32WG Radio Board is shown in the figure below.
USB_VBUS (5 V)
EZRWG330
USB Micro-B
USB_D+/DConnector
USB_VBUS
USB_VREGI
USB Regulator Output (3.3 V)
to WSTK Motherboard
USB_VREGO
Radio Board Connectors
Power Supply (3.3 V)
from WSTK Motherboard
VMCU
PA
PB
PC
PD
PE
PF
Power
Domain
Backup
Capacitor
MCU
I/O
Ports
VRF
LF Crystal
(32.768 kHz)
MCU
HF Crystal
(48 MHz)
RF Crystal
(30 MHz)
XIN/XOUT
RADIO
TX_13
RXN/RXP
Direct Tie
Matching
Network
SMA
Connector
GPIO2/3
Board
Identification
Figure 3.1. EZR32WG Radio Board block diagram
3.1 USB
The EZR32WG Radio Board incorporates a micro USB connector (P/N: ZX62-B-5PA(11)). The 3.3V USB regulator output is are routed
back to the WSTK through the Radio Board Connector so the Radio Board can supply power to the Wireless Starter Kit Mainboard.
For additional information on EZR32WG USB, refer to the EZR32WG330 Data Sheet.
3.2 RF Crystal Oscillator
The BRD4502D (Rev. A00) Radio Board has a 30 MHz crystal mounted (P/N: NX2016SA 30 MHz EXS00A-CS06568). For more details
on crystal or TCXO selection for the RF part of the EZR32 devices refer to "AN785: Crystal Selection Guide for the Si4x6x RF ICs".
3.3 LF Crystal Oscillator (LFXO)
The BRD4502D (Rev. A00) Radio Board has a 32.768kHz crystal mounted (P/N: MS3V-T1R, 32768Hz, 12.5pF, +/- 20ppm). For safe
startup two 22 pF capacitors are also connected to the LFXTAL_N and LFXTAL_H pins. For details regarding the crystal configuration,
the reader is referred to Application Note "AN0016: EFM32 Oscillator Design Consideration".
3.4 HF Crystal Oscillator (HFXO)
The BRD4502D (Rev. A00) Radio Board has a 48 MHz crystal mounted (P/N: ABM11-48.000MHZ-D2X-T3). For safe startup two 10 pF
capacitors are also connected to the HFXTAL_N and HFXTAL_H pins. For details regarding the crystal configuration, the reader is referred to Application Note "AN0016: EFM32 Oscillator Design Consideration".
3.5 Backup Power Domain Capacitor
The BRD4502D (Rev. A00) Radio Board has a 30 mF super capacitor mounted (P/N: PAS311HR-VA6R), connected to the PD8 port of
the EZR32WG.
For details regarding the Backup Power Domain, the reader is referred to the EZR32WG330 Data Sheet.
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BRD4502D (Rev. A00)
EZR32WG Radio Board block description
3.6 RF Matching Network
The BRD4502D (Rev. A00) Radio Board includes a Class E type matching network with Direct Tie TX and RX sides are connected
together without an additional RF switch, to be able to use one antenna both for transmitting and receiveing. The component values
were optimized for the 434 MHz band RF performace and current consumption with 10 dBm output power.
For more details on the matching network used on the BRD4502D (Rev. A00) see Chapter 4.1 Matching network
3.7 SMA connector
To be able to perform conducted measurements or mount external antenna for radiated measurements, range tests etc., Silicon Labs
added an SMA connector (P/N: 5-1814832-1) to the Radio Board. The connector allows an external 50 Ohm cable or antenna to be
connected during design verification or testing.
3.8 Radio Board Connectors
Two dual-row, 0.05” pitch polarized connectors (P/N: SFC-120-T2-L-D-A-K-TR) make up the EZR32WG Radio Board interface to the
Wireless Starter Kit Mainboard.
For more information on the pin mapping between the EZR32WG330F256R55G and the Radio Board Connector refer to Chapter
1. Radio Board Connector Pin Associations.
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BRD4502D (Rev. A00)
RF section
4. RF section
The BRD4502D (Rev. A00) Radio Board includes a Class E type TX matching network with the targeted output power of 10 dBm at 434
MHz.
The main advantage of the Class E matching types is their very high efficiency. They are proposed for applications where the current
consumption is most critical, e.g., the typical total EZRadio chip current with Class E type matching is ~17–19 mA at ~10 dBm and ~25
mA at ~13 dBm power levels (using the 13dBm PA output and assuming 3.3 V Vdd).
The main disadvantage of the Class E type matches is the high Vdd dependency (the power variation is proportional to the square of
the Vdd change: i.e. the decrease in power can be ~6 dB in the 1.8–3.8 V range) and the inaccurate nonlinear power steps. Also their
current consumption and the peak voltage on the TX pin are sensitive to the termination impedance variation, and they usually require
slightly higher order filtering and thus higher bill of materials cost.
The matching network is constructed with a so-called Direct Tie configuration where the TX and RX sides are connected together without an additional RF switch, to be able to use one antenna both for transmitting and receiveing. Careful design procedure was followed
to ensure that the RX input circuitry does not load down the TX output path while in TX mode and that the TX output circuitry does not
degrade receive performance while in RX mode.
For detailed explanation of the Class E type TX matching and the Direct Tie configuration matching procedure the reader is referred to
"AN693: Si4455 Low-Power PA Matching". For detailed description of the RX matching the reader is referred to "AN643: Si446x/Si4362
RX LNA Matching".
4.1 Matching network
The matching network structure used on the BRD4502D (Rev. A00) Radio Board is shown in the figure below.
GND
U1B
EZR32xx
7
9
VDD_RF
LNA Balun
CR1
LR2
RXP
2
VDD_RF
LR1
RXN
CR2
3
Antenna
Connector
VRF
62
61
LC
XIN
P1
L0
XOUT
TX_13
TX_20
8
C0
LM
LM2
2
3
CC1
4
1
4
5
5
TXRAMP
CM
CM3
CM2
TP1
RF_TEST_POINT
PA Matching
SMA
GND
GND
GND
GND
GND
Filter
Figure 4.1. RF section of the schematic of the EZR32 Wonder Gecko Radio Board (BRD4502D (Rev. A00))
The matching network has a so-called Direct Tie configuration where the TX and RX sides are connected together, without an additional RF switch, to be able to use one antenna both for transmitting and receiving.
For detailed explanation of the TX matching process, see "AN693: Si4455 Low-Power PA Matching". Due to the Direct Tie configuration
of the matching, the RX matching should also taken into account during the TX matching procedure. The above Application Note contains component values and a shorter description for the RX matching as well. For detailed description of the RX matching refer to
"AN643: Si446x/Si4362 RX LNA Matching".
The component values were optimized for the 434 MHz band RF performace and current consumption with 10 dBm output power. The
resulting component values with part numbers are listed in the table below.
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BRD4502D (Rev. A00)
RF section
Table 4.1. Bill of Materials for the BRD4502D (Rev. A00) RF matching network
Component name
Value
Part Number
C0
20pF
GRM1555C1H200J
CM
5.6pF
GRM1555C1H5R6D
CM2
15pF
GRM1555C1H150J
CM3
8.2pF
GRM1555C1H8R2D
CR1
5.1pF
GRM1555C1H5R1D
CR2
2.7pF
GRM1555C1H2R7C
CC1
220pF
GRM1555C1H221J
L0
56 nH
0402HP-56NXJL
LC
220 nH
0402HPH-R22XJL
LM
18 nH
0402HP-18NXJL
LM2
18 nH
0402HP-18NXJL
LR1
56 nH
0402HP-56NXJL
LR2
56 nH
0402HP-56NXJL
The Application Note "AN693: Si4455 Low-Power PA Matching" contains component values for reference matching networks which
were developed for the EZRadioPRO Pico Boards. For the WSTK radio boards some fine-tuning of the component values may be necessary due to different parasitic effects (bonding wire, layout etc.). For optimized RF performance the component values listed in the
table above may differ from the ones listed in the referred Application Note.
For the reader’s specific application and board layout the adjustment of the final matching values might be necessary. The above component values should be used as starting points and the values modified slightly to zero-in on the best filter response and impedance
match to 50 ohm. To minimize the differences due to different layout parasitics Silicon Labs recommends copying the layout of the RF
section of the radio board as is. If that is not possible, refer to "AN685: Layout Design Guide for the Si4455/435x RF ICS" for layout
design recommendations.
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BRD4502D (Rev. A00)
Mechanical details
5. Mechanical details
The EZR32 Wonder Gecko Radio Board (BRD4502D (Rev. A00)) is illustrated in the figures below.
0.81 mm
2.7 mm
USB
Connector
7.5 mm
Power
Domain
Backup
Capacitor
HFXTAL
Frame of the
Optional
Shielding Can
LFXTAL
30 mm
23 mm
Board
Identification
EZR32xx
SMA Connector
RFXTAL
RF Matching
and Filtering
43 mm
Figure 5.1. BRD4502D (Rev. A00) top view
5 mm
24 mm
28.6 mm
27.3 mm
15 mm
Interface
Connector
Interface
Connector
Figure 5.2. BRD4502D (Rev. A00) bottom view
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BRD4502D (Rev. A00)
RF performance
6. RF performance
6.1 Measurement setup
The EZR32 Wonder Gecko Radio Board (BRD4502D (Rev. A00))was attached to a Wireless Starter Kit Mainboard (BRD4001 (Rev.
A02)) and its transceiver was operated in continuous carrier transmission mode. The output power of the radio was set to 10 dBm
(DDAC = 20h).
6.2 Conducted Power Measurements
In case of the conducted measurements the output power was measured by connecting the EZR32WG Radio Board directly to a Spectrum Analyzer (P/N: MS2692A) through its on-board SMA connector. At 10 dBm output power and 3.3 V supply voltage the measured
typical current consumption of the RF section of the board is 17.3 mA.
A typical output spectrum up to 10 GHz is shown in the figure below.
Figure 6.1. Typical output spectrum of the BRD4502D (Rev. A00) Radio Board; with DDAC=20h at Vdd=3.3 V
Note: In practice comercially available whip antennas usually have ~0-2 dB gain at the fundamental and < 0 dB gain at the harmonic
frequencies so if the conducted levels are compliant with the emission limits with small margin it is likely that the margin on the harmonics radiated by an external whip antenna will be higher. Unfortunately in most cases, the PCB radiation (from traces or and/or components) is stronger so using shielding, applying larger duty cycle correction (if allowed) or reductionof the fundamental power could be
necessary.
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BRD4502D (Rev. A00)
RF performance
6.3 Radiated Power Measurements
For radiated measurements an external whip antenna (P/N: ANT-433-CW-QW-SMA) was used. The power supply for the board were
two AA batteries (3 V). The batteries were connected to the Wireless Starter Kit Mainboard through its External Power Supply connector with minimal wire length to minimize the wire radiation.
The DUT was rotated in 360 degree with horizontal and vertical reference antenna polarizations in the XY, XZ and YZ cuts. The measurement axes are as shown in the figure below.
Figure 6.2. DUT: BRD4502D (Rev. A00) Radio Board with Wireless Starter Kit Mainboard
The measured radiated powers are shown in the table below.
Table 6.1. Results of the radiated power measurements
434 MHz
Measured maximums of the radiated power in EIRP [dBm]
XY
XZ
ETSI limit in
EIRP [dBm]
YZ
H
V
H
V
H
V
Fundamental
+5.6
+9.8
+11.2
+2.0
+10.7
-3.0
+12.1
2nd harmonic
-61.9
-47.1
-51.2
-52.7
-50.3
-59.9
-33.9
3rd harmonic
-*
-*
-*
-*
-*
-*
-27.9
4th harmonic
-*
-*
-63.9
-*
-*
-*
-27.9
5th harmonic
-*
-59.4
-59.7
-62.3
-62.4
-*
-27.9
6th harmonic
-*
-*
-59.1
-*
-56.5
-60.1
-27.9
7th harmonic
-*
-55.8
-53.4
-57.9
-54.3
-59.9
-27.9
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BRD4502D (Rev. A00)
RF performance
434 MHz
Measured maximums of the radiated power in EIRP [dBm]
XY
XZ
ETSI limit in
EIRP [dBm]
YZ
H
V
H
V
H
V
8th harmonic
-56.1
-50.9
-56.1
-51.9
-53.4
-56.2
-27.9
9th harmonic
-*
-*
-56.7
-*
-*
-*
-27.9
10th harmonic
-*
-*
-*
-*
-*
-*
-27.9
Note: * Signal level is below the Spectrum Analyzer noise floor.
One may notice that the radiated harmonic levels are higher compared to the levels expected based on the conducted measurement.
Investigations showed that this increase is due to the PCB radiations (components and PCB traces).
Note: The radiated measurement results presented in this document were recorded in an unlicensed antenna chamber. Also the radiated power levels may change depending on the actual application (PCB size, used antenna etc.) therefore the absolute levels and
margins of the final application is recommended to be verified in a licensed EMC testhouse!
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BRD4502D (Rev. A00)
Document Revision History
7. Document Revision History
Table 7.1. Document Revision History
Revision Number
Effective Date
Change Description
1.10
19.03.2015
Radio Board errata added.
1.00
23.02.2015
Major content update.
0.10
04.02.2015
Initial document version.
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BRD4502D (Rev. A00)
Errata
8. Errata
Table 8.1. BRD4502D Radio Board Errata
Radio Board Revision
Problem
Description
A00
USB functionality broken. In this revision USB_VREGI and USB_VREGO pins have been swapped. This
means that USB does not work on this revision of the BRD4502D radio board. If
you require USB functionality, please contact support for a replacement.
Missing MCU peripherals Due to EZR32WG330F256R55G chip errata, UART peripherals are not available. UART functionality on USART peripherals remain unaffected.
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Disclaimer
Silicon Laboratories intends to provide customers with the latest, accurate, and in-depth documentation of all peripherals and modules available for system and software implementers
using or intending to use the Silicon Laboratories products. Characterization data, available modules and peripherals, memory sizes and memory addresses refer to each specific
device, and "Typical" parameters provided can and do vary in different applications. Application examples described herein are for illustrative purposes only. Silicon Laboratories
reserves the right to make changes without further notice and limitation to product information, specifications, and descriptions herein, and does not give warranties as to the accuracy
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