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PDF ER400TRS Data sheet ( Hoja de datos )
| Número de pieza | ER400TRS | |
| Descripción | LPRS Prelimina ry Data Sheet | |
| Fabricantes | ETC | |
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LPRS Prelimina ry Data Sheet
Easy -Radio ER400TRS Transceiver
The Easy-Radio ER400TRS intelligent radio
transceiver incorporates Easy-Radio technology to
provide a high performance, simple to use radio
device that can bi-directionally transfer serial data over
a range of up to 250 metres Line Of Sight (LOS).
The transceiver operates on the Pan-European
433MHz frequency band from a 3.6V supply and is housed in a space saving
Single-In-Line (SIL) package. Serial input and output simplify interface to host
systems and the embedded software reduces design and development time significantly.
This data sheet describes the electrical and physical characteristics of the device. Operation of the software
is described in the ‘Easy-Radio Software Guide’, which should be read in conjunction with this data sheet.
Features
Crystal controlled synthesiser for frequency accuracy
Highly selective front -end, 175KHz improves range
10mW Transmit RF power output, -105dBm sensitivity
Serial Input & Output for transparent data transmission
Low operating voltage - 3.6 Volts – Single Lithium Cell
Low power consumption: <23mA in Transmit mode
17.0mA in Receive mode
User programmable:
Frequency of operation
Data Rate
Output Power
Applications
Handheld Terminals
Environmental Sense & Control
Vehicle to Base Station Data Transfer
Remote Data Acquisition
Electronic Point of Sale equipment
Description
The Easy-Radio 400 Transceiver is a complete sub-system that combines a high performance very low
power RF transceiver, a microcontroller and a voltage regulator. (Figure 1) The microcontroller programmes
the functions of the RF transceiver and provides the interface to the host system via a serial input/output. It
also contains programmable EEPROM memory that holds configuration data for the various transceiver-
operating modes. The microcontroller also relieves the host from the intensive demands of searching for
signals within the noise, recovering the received data and transmitting data in a suitable format. A Received
Signal Strength Indicator output can be optionally used to measure received signal levels. The module
connects to a 50-Ohm antenna such as a whip, helical or PCB loop.
Antenna
Regulator
RSSI Output
Vcc
RF Transceiver
Micro
Controller
Serial Data Input
Serial Data Output
Host Ready Input
Busy Output
Ground
Figure 1 Easy-Radio Transceiver Block Diagram
The Serial Data Input and Serial Data Output operate at the standard 19,200 Baud and the two handshake
lines provide optional flow control to and from the host. The Easy-Radio Transceiver can accept and transmit
up to 192 bytes of data, which it buffers internally before transmitting in an efficient over-air code format.
Any other Easy-Radio Transceiver within range that ‘hears’ the transmission will decode the message and
place the recovered data within a receive buffer that can then be unloaded to the receiving host for
processing and interpretation. Transmission and reception are bi-directional half duplex i.e. transmit OR
receive but not simultaneously.
Easy-Radio ER400TS-RS 1.3
Copyright LPRS 2002. Iss. 1-3 September 2003
Page 1 of 7
1 page  
LPRS Prelimina ry Data Sheet
Easy -Radio ER400TRS Transceiver
ready to receive (default) or transmit. It would normally be left in this powered state ready to receive
data.
4. During power up the Busy Output line goes high.
5. Contact the Sales Office for special ‘fast’ versions that can incorporate internal ‘duty cycling’ to
further reduce quiescent power consumption for battery powered applications.
6. Serial data rate up to 38.4k standard but 76.8k available on request.
Notes
RSSI Output
The transceiver has a built in RSSI (Received Signal Strength Indicator) that provides an analogue output
voltage that is inversely proportional to the RF energy present within the pass band of the receiver. It ranges
from 0 Volt (maximum signal, –50dBm) to 1.2 Volts (minimum signal, -105bBm) and has a slope of
approximately 50dB/Volt. This analogue output signal should only be connected to a high impedance load
(>100k Ohms) and can be used to provide a measure of the signal strength and any interfering signals
(noise) within band during the installation and operation of systems.
433MHz
1.3
1.2
1.1
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
-105 -100 -95 -90 -85 -80 -75 -70 -65 -60 -55 -50
dBm
PCB Layout
Figure 4 RSSI Output
The Ground (0 Volt) pins of the transceiver should be connected to a substantial ground plane (large area of
PCB copper) connected to 0 Volt. It is suggested that a double-sided PCB be used with one layer being the
ground plane.
Power Supply
The supply used to power the transceiver should be ‘clean’ and free from ripple and noise (<20mV p-p total).
It is suggested that 100nF ceramic capacitors be used to de-couple the supply close to the power pins of the
transceiver. The use of ‘switch mode’ power supplies should be avoided as they can generate both
conducted and radiated high frequency noise that can be very difficult to eliminate. This noise may
considerably reduce the performance of any radio device that is connected or adjacent to the supply.
Antennas
The transceiver can be used with the various common types of antenna that match the 50 Ohm RF
Input/Output such as a monopole (whip), helical or PCB/Wire loop antennas.
Monopole antennas are resonant with a length corresponding to one quarter of the electrical wavelength
(λ/4). They are very easy to implement and can simply be a ‘piece of wire’ or PCB track which at 434MHz
should be 16.4 cms in length. This should be straight, in ‘free space’ (kept well away from all other circuitry)
and should be connected directly to the Antenna pin of the transceiver. If the antenna is remote it should be
connected via a 50 Ohm coaxial feeder cable or transmission line. A 50 Ohm transmission line can be
constructed on FR4 board material by using a 3mm wide PCB track over a ground plane. This should be
kept as short as possible.
Helical antennas are also resonant and generally chosen for their more compact dimensions. They are more
difficult to optimise than monopole antennas and are critical with regard to surrounding objects that can
Easy-Radio ER400TS-RS 1.3
Copyright LPRS 2002. Iss. 1-3 September 2003
Page 5 of 7
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