S i 4 4 5 5 - 2 Wa y L i n k - D E M O
Si4455 EZR
ADIO ®
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1. Overview
Thank you for your interest in Silicon Laboratories Si4455 EZRadio® Two-Way Link Demo Kit. The Silicon
laboratories Si4455 EZRadio Two Way Link Demo Kit (P/N EZR-LEDK2W-XXX) contains everything you need to
familiarize yourself with and evaluate the Si4455 transceiver. The kit has three versions: one for the 434 MHz
band, one for the 868 MHz band and one for the 915 MHz band. The key features of the demo kit are as follows:
The
demo boards have four LEDs to display information and four push-buttons to receive user commands.
The provided software pack contains all the documentation and files needed to develop a user application.
The kit supports the use of the Silicon Laboratories Integrated Development Environment (IDE) for
software debugging and the use of the Keil & SDCC C compiler, assembler, and linker toolchain.
The kit supports the use of the Wireless Development Suit (WDS) for setting radio parameters & managing
application firmware.
The demo boards come with the Si4455 range test demo application. The range test demo implements
Packet Error Rate (PER) measurement. PER is a commonly-used technique for measuring the quality of
RF links in wireless systems under particular conditions.
1.1. Kit Contents
Table 1. Kit Contents
Qty
Part Number
EZR-LEDK2W-434
2
2
2
4
4455-LED-434-PER
Toolstick_BA
USB-XTEN-01
AAA
EZR-LEDK2W-868
2
2
2
4
4455-LED-868-PER
Toolstick_BA
USB-XTEN-01
AAA
EZR-LEDK2W-915
2
2
2
4
Rev. 0.1 6/12
Description
Si4455 EZRadio Two Way Demo Kit 434MHz
Si4555 RFStick 434MHz EZRadio transceiver board
Toolstick Base Adapter
USB extender cable (USBA-USBA)
AAA alkaline battery
Si4455 EZRadio Two Way Demo Kit 868MHz
Si4555 RFStick 868MHz EZRadio transceiver board
Toolstick Base Adapter
USB extender cable (USBA-USBA)
AAA alkaline battery
Si4455 EZRadio Two Way Demo Kit 915MHz
Si4555 RFStick 915MHz EZRadio transceiver board
Toolstick Base Adapter
USB extender cable (USBA-USBA)
AAA alkaline battery
Copyright © 2012 by Silicon Laboratories
Si4455-2WayLink-DEMO
4455-LED-915-PER
Toolstick_BA
USB-XTEN-01
AAA
Si4455-2WayLink-DEMO
Figure 1. Si4455 RFStick 434 MHz Transceiver Board (P/N 4455-LED-434-PER)
Figure 2. Toolstick Base Adapter (P/N Toolstick_BA)
For more information on using the RFstick and the Toolstick Base Adapter together to develop your own
application please refer to the “AN692: Si4355/Si4455 Programming Guide and Sample Code.”
The demo boards come with the Si4455 range test demo application; however, be sure to use the latest version of
the application. The user can update the firmware on the boards using the firmware update functionality of the
WDS. For more information on updating the firmware, refer to the "WDS User's Guide for EZRadio Next
Generation".
2
Rev. 0.1
Si4455-2WayLink-DEMO
2. Range Test Demo
2.1. Basics
As it was stated above range test demo is used to provide measured results on the quality of the RF link.
The demo uses two RFstick one of them as the ‘transmitter’ (TX) other as the ‘receiver’ (RX). Both RFsticks can be
either transmitters or receiver.
The transmitter sends packets to the receiver repeatedly with half second interval. The packet includes address of
the transmitter and number of the sent packet. The packet number increments from packet to packet.
The receiver receives the packet and checks its address. If their addresses match packet number is stored. The
receiver then sends back an acknowledge packet (ACK) to the transmitter. ACK packet also includes the address
and the packet number of the received packet.
PER can be calculated with the following equation:
P
TX
–
P
RX
-
PER
= --------------------------
100
P
TX
Where:
PER is the packet error rate (%)
P
TX
is the number of sent packets
P
RX
is the number of received packets
The transmitter can calculate PER using the following data:
P
TX
P
RX
P
TX
P
RX
is the packet counter to be included in the packet
is the number of all the received acknowledge packets
is the packet number included in the last received packet
is the number of all received data packets
The receiver can calculate PER using the following data:
2.2. RF and Demo Parameters
This section provides information on the user parameters of the range test demo. All the parameters (excluding
frequency band) can be changed in the demo through its menu system (see "2.4. Menu System of the Range Test
Demo" on page 6). The following parameters are available:
band (defined by the HW)
Communication frequency (selected by the user)
Node address (selected by the user)
Modulation (selected by the user)
Data rate (selected by the user)
Demo settings are stored in the MCU’s flash memory and restored after power on reset. Default values are loaded
if no settings were previously stored in the flash.
It is also possible to define custom RF parameters for communication. Custom parameters can be stored with the
Wireless Development Suit (WDS). For more information on creation and storage of custom parameters, refer to
the WDS User’s guide for EZRadio Next Generation.
Frequency
Rev. 0.1
3
Si4455-2WayLink-DEMO
2.3. Frequency and Frequency Bands
The RFstick provides RF matching solutions for all supported frequency bands. Different HW solutions are required
for each frequency bands. Range test demo automatically reads required frequency band information from the on
board EEPROM and selects the appropriate frequency range.
Silicon Labs provides Si4455 Two Way Demo Link Kits for the following frequency bands:
band: 425–525 MHz
High band: 850–960 MHz
Range test demo provides four different selectable frequencies in all the supported bands. In case of custom
parameters are stored the custom frequency can also be selected, but only in the defined frequency band. Table 2
lists the available frequencies.
Middle
Table 2. Available Frequencies
Freq. band
Middle
0
Frequency
Number
1
2
3
4
2.3.1. Node Address
Each node using the range test demo can select from 16 different addresses (0-15). Transmitter and receiver of the
same link have to use the same addresses. It is advised to use only one link (one transmitter and one receiver)
with the same address within close proximity, otherwise the different systems will disturb each other.
2.3.2. Modulation
User can select from three types of modulation:
GFSK
High
Custom
867.84 MHz
868.30 MHz
917.00 MHz
950.00 MHz
Custom
433.92 MHz
434.15 MHz
458.50 MHz
475.00 MHz
with high precision TX crystal (TX: 30 ppm, RX: 30 ppm)
GFSK (TX: 150 ppm, RX: 30 ppm)
OOK
2.3.3. Data Rate
User can select from three different data rates. In case of custom settings are stored the custom data rate can also
be selected. Table 3 lists the available data rates.
Table 3. Available Data Rates
Modulation
GFSK
(both types)
0
Data Rate
Number
1
2
3
Custom
9.6 kbps
38.4 kbps
128.0 kbps
OOK
Custom
2.4 kbps
9.6 kbps
20.0 kbps
4
Rev. 0.1
Si4455-2WayLink-DEMO
2.3.4. Custom Parameters
As it was stated above user can store custom RF parameters into the devices with WDS. One custom field is
available in each node. If any of the three RF parameters (frequency, modulation, data rate) is set to custom both
the other parameters are configured to be custom as well.
Notes:
The
firmware drops an error message and continues with default parameters if no custom field is stored,
but custom parameter is selected.
The firmware goes to error state if the frequency band of the custom settings mismatches with the
frequency band of the device.
2.3.5. Default Demo Settings
The default demo settings are as follows:
Frequency
Middle
band:
defined by the HW
Frequency number:
band:
1
High band—868 MHz:
2
High band—915 MHz:
4
Node
address:
5
Modulation:
High precision GFSK
Data rate number:
1
(FSK: 9.6 kbps, OOK: 2.4 kbps)
Rev. 0.1
5
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