AUREL RTX-8L3V-FSK User manual

RTX-8L3V-FSK
RTX-8L3V-A
SK
---------------------------------------------------------------------------------------------------------------------------------------------------
User Manual
Le caratteristiche tecniche possono subire variazioni senza preavviso. AUR°EL S.p.A. non si assume la responsabilità di danni causati dall’uso improprio del dispositivo.
---------------------------------------------------------------------------------------------------------------------------------------------------------------------
28/04/2020 AUR°EL S.p.A. Via Foro dei Tigli, 4 - 47015 Modigliana (FC) – ITALY
Tel.: [phone] Fax: [phone]
http://www.aurelwireless.com - email: [email protected] Pag1 di 17
RTX-8L3V-FSK/ASK is an RF digital data transceiver, with high sensitivity and p wer d wn m de
functi nality, w rking n the ISM free-license band f 868.30 MHz, in half-duplex way, FSK m dulated and
fast switch time TX→
→→
→RX and RX→
→→
→TX.
It’s ideal f r l w c st s luti ns, battery supplied systems and thanks t its small size t hand-held terminals;
f r 2-way radi system needing t save space and battery life.
Max speed rate is 4 Kbit/sec Manchester enc ded.
The device can w rk in c mpliance with HCS Micr chip data frame.
All transceiver features can be handled by 4 lines (RX/TX, ENABLE, DATA IN, DATA OUT).
The m dule is available at 3V f p wer supply and it’s c mpliant t Eur pean N rmative EN300 220 and
EN301 489.
Characteristics Applications
Low current consumption
Low cost
LL synthesis crystal based
Single RF channel
Very small size (25.4x12.4 mm)
Max bit rate : 4800 bps
Max Output ower : 10mW
High sensitivity on reception
Voltage supply: 3V
Wireless hands-free devices
Home automation
Wireless sensors
Meter reading
2-way remote controls
Data logging
Absolute maximum
Operati nal Temperature -20 °C ÷ +85 °C
St cking Temperature -40 °C ÷ +100 °C
V ltage Supply -0,3V ÷ +6V
Input V ltage -0,3V ÷ VCC + 0,3V
Output V ltage -0,3V ÷ VCC + 0,3V

RTX-8L3V-FSK
RTX-8L3V-A
SK
---------------------------------------------------------------------------------------------------------------------------------------------------
User Manual
Le caratteristiche tecniche possono subire variazioni senza preavviso. AUR°EL S.p.A. non si assume la responsabilità di danni causati dall’uso improprio del dispositivo.
---------------------------------------------------------------------------------------------------------------------------------------------------------------------
28/04/2020 AUR°EL S.p.A. Via Foro dei Tigli, 4 - 47015 Modigliana (FC) – ITALY
Tel.: [phone] Fax: [phone]
http://www.aurelwireless.com - email: [email protected] Pag2 di 17
Technical Characteristics
Table 1 – Technical characteristics
Min. Typ. Max. Unit
DC Levels
V ltage supply 2.5 3 3.6 V
Supply current (RX m de)
Enable=1
TX/RX=0
11,2 mA
Supply current(PWRDWN m de)
Enable = 0
TX/RX = 0
Data in = 0
0,5 µA
Supply current (TX m de)
Enable = 1
TX/RX = 1
19,3 mA
Supply current (TX m de, m dulati n 50%) 12 mA
Supply current (Idle m de)
Data in = 0
Enable and TX/RX = 1
4,7 mA
L gic level “1” in input/ utput 0,9 X Vcc V
L gic level “0” in input/ utput 0,1 X Vcc V
ESD antenna pr tecti n (c ntact) ±4 kV
ESD antenna pr tecti n (discharge) ±8 kV
Receiver
Frequency 868.30 MHz
RF Sensitivity (RF/AM/99%/1KHz square wave) -107 dBm
RF Sensitivity (RF/FM/12,5KHz dev./1KHz square wave) -99 dBm
RF Sensitivity (RF/FM/12,5KHz dev./3KHz square wave) -98 dBm
Image frequency 867.4 MHz
Image frequency sensitivity -62 dBm
Bl cking t ±2Mhz (measured fr m Data Out) 79 dB
Bl cking t ±10Mhz (measured fr m Data Out) 95 dB
V ltage Data Out Vdd-0,3 V
BF Output 0,05 1 5 KHz
Transmitter
Transmissi n frequency 868.30 MHz
OOK m dulati n 99 %
FSK m dulati n ±12,5 KHz
RF Output P wer 5 dBm
Spuri us emissi n <1GHz -40 dBm
Spuri us emissi n >1GHz -40 dBm
Minimum supply with utput p wer limited t -3dB 1,9 V
FSK data-rate m dulati n 10 KHz
OOK data-rate m dulati n 10 KHz
Switching times
PWRDWN → RX
Sensitivity -100dBm
Sensitivity -109dBm
30
35
ms
PWRDWN → TX 40 ms
TX → RX
Sensitivity -100dBm
Sensitivity -109dBm
2
5
ms
RX → TX 0,1 ms

RTX-8L3V-FSK
RTX-8L3V-A
SK
---------------------------------------------------------------------------------------------------------------------------------------------------
User Manual
Le caratteristiche tecniche possono subire variazioni senza preavviso. AUR°EL S.p.A. non si assume la responsabilità di danni causati dall’uso improprio del dispositivo.
---------------------------------------------------------------------------------------------------------------------------------------------------------------------
28/04/2020 AUR°EL S.p.A. Via Foro dei Tigli, 4 - 47015 Modigliana (FC) – ITALY
Tel.: [phone] Fax: [phone]
http://www.aurelwireless.com - email: [email protected] Pag3 di 17
in description and mechanical size
Table 2 – Pin description
n° in Name Description
1 ANTENNA
Antenna c nnecti n 50 hm. RF utput f r TX, RF input f r RX
2 GND
Gr und
4 DATA IN
Data Input f TX
ASK versi n
1 = emissi n f carrier
0 = n emissi n
FSK versi n
1 = emissi n f carrier 868,3 - 0,012MHz
0 = emissi n f carrier 868,3 + 0,012MHz
5 TX/RX
0 r fl ating = Receiver m de (Receiver ON, Transmitter OFF)
1 = Transmitter m de (Receiver OFF, Transmitter ON)
NOTE: l k at figures bel w f r switching times
Pin c nnected t pull d wn resist r
6 ENABLE
Enable = 0 : PWRDWN
Enable = 1 : Device ON
7 GND
Gr und
8 RSSI OUT
Output anal g f r test purp se.
RSSI anal g value f the received signal p wer. Refer t Figure 14.
9 DATA OUT
Digital data utput f receiver with 0-Vcc v ltage range.
When in transmissi n (pin 5 high) data utput is l gic level l w.
10 +VCC
C nnecti n t the supply p sitive p le:
C nnect 100 nF capacit r t wards gr und plane
in-out
1) ANTENNA
2) GND
4) DATA IN
5) TX/RX
6) ENABLE
7) GND
8) RSSI OUT
9) DATA OUT
10) +VCC

RTX-8L3V-FSK
RTX-8L3V-A
SK
---------------------------------------------------------------------------------------------------------------------------------------------------
User Manual
Le caratteristiche tecniche possono subire variazioni senza preavviso. AUR°EL S.p.A. non si assume la responsabilità di danni causati dall’uso improprio del dispositivo.
---------------------------------------------------------------------------------------------------------------------------------------------------------------------
28/04/2020 AUR°EL S.p.A. Via Foro dei Tigli, 4 - 47015 Modigliana (FC) – ITALY
Tel.: [phone] Fax: [phone]
http://www.aurelwireless.com - email: [email protected] Pag4 di 17
Block diagram
RX
SAW filter PLL l gic
c ntr l
P.A
Switch
antenna
VCO-RX
VCO-TX
2
10
9
8
7
6
1
5
4
Figure 1
Transmitter
It embeds a VCO scillat r c ntr lled by PLL circuit in rder t achieve sh rt switching time TX-RX and wake
up time fr m stand-by m de.
A p wer amplifier b sts the emitted p wer up t 5dBm.
Spuri us emissi ns are limited by SAW filter techn l gy.
Transmitter is switched n driving high RX/TX line and l w the data in line.
The PLL circuit switches n in 200-300 µS, necessary time t set pr perly the RF scillat r.
In rder t transmit, drive high r l w the data in line acc rding t the desired data sequence.
Data can be an enc ded frame r just c ming fr m data ut p rt. The data rate must be l wer than 10
kbit/sec.
Receiver
It’s a single c nversi n superhet-receiver with l cal scillat r, mixer circuit with frequency image rejecti n
and IF frequency at 400 kHz.

RTX-8L3V-FSK
RTX-8L3V-A
SK
---------------------------------------------------------------------------------------------------------------------------------------------------
User Manual
Le caratteristiche tecniche possono subire variazioni senza preavviso. AUR°EL S.p.A. non si assume la responsabilità di danni causati dall’uso improprio del dispositivo.
---------------------------------------------------------------------------------------------------------------------------------------------------------------------
28/04/2020 AUR°EL S.p.A. Via Foro dei Tigli, 4 - 47015 Modigliana (FC) – ITALY
Tel.: [phone] Fax: [phone]
http://www.aurelwireless.com - email: [email protected] Pag5 di 17
Fr nt end circuit and AGC:
A SAW filter is in the middle between antenna and pre-amplifier stage. AGC (aut matic gain c ntr l) circuit
acting n the gain impr ves the dynamic f RF received signal.
AGC turns n whenever the RF received signal is m re p werful than -74dBm and it sets the max gain 7ms
after the RF signal g es d wn the -59 dBm.
This t lerance range prevents endless switches f AGC during recepti n.
Data-Slicer:
This circuit c nverts the anal g signal c ming fr m L.F. t digital ne.
It’s made up f a c mparat r, anal g signal is c nnected t RC netw rk with charge and discharge (time
c nstant equals t 2.25ms).
The circuit all ws recepti n f data pulses with length l wer than 5 ms and higher than 100 us.
It’s n t p ssible t receive UART RS-232 signals. It’s highly suggested t use a balanced c de (Manchester)
as the byte c ntains at least a high r l w level, all wing the peak detect r t perate pr perly.
It’s n t p ssible t receive a DC l w r high level f r a time l nger than 10ms; theref re in case f receiving
pr prietary data frame, it is rec mmended t enc de data taking care f the pulse length limit (10ms).
Squelch immunity t data utput:
The digital utput f receiver (pin 9) is n t immune t white n ise generated by the receiver itself when n
carrier is n air, then pseud -rand m c de, like white n ise, c mes ut f the data utput.
Typically digital utput is c nnected t the input p rt f a micr c ntr ller which must rec gnize valid data
am ng the white n ise.
Figure 2

RTX-8L3V-FSK
RTX-8L3V-A
SK
---------------------------------------------------------------------------------------------------------------------------------------------------
User Manual
Le caratteristiche tecniche possono subire variazioni senza preavviso. AUR°EL S.p.A. non si assume la responsabilità di danni causati dall’uso improprio del dispositivo.
---------------------------------------------------------------------------------------------------------------------------------------------------------------------
28/04/2020 AUR°EL S.p.A. Via Foro dei Tigli, 4 - 47015 Modigliana (FC) – ITALY
Tel.: [phone] Fax: [phone]
http://www.aurelwireless.com - email: [email protected] Pag6 di 17
Operational modes
RTX-8L3V-FSK/ASK can w rk in 4 different m des:
1. ower Down Mode
2. Idle Mode
3. RF Transmission Mode
4. RF Receiving Mode
1. P wer D wn M de (PWRDWN)
By driving l w level pin 6 (ENABLE) the device enters the saving-energy m de, where c nsumpti n is less
than 0,5µA: this m de the transceiver can’t neither receive n r transmit.
2. Idle M de
Initial state where the transceiver is in idle m de when pin 6 (ENABLE) and pin 5 (TX/RX) are high and pin
4(data in) is l w level.
In idle m de the transceiver is n with c nsumpti n f 4,7mA.
PLL circuit f transmitter is active.
3. RF Transmissi n M de
When the pin 5 (TX/RX) and 6 (ENABLE) are b th high, the RF carrier is emitted thr ugh antenna with 5
dBm p wer and the verall c nsumpti n is ar und 19,3mA.
4. RF Receiving M de
Receiving m de is selected by driving l w pin 5 (RX/TX) and high pin 6 (ENABLE).

RTX-8L3V-FSK
RTX-8L3V-A
SK
---------------------------------------------------------------------------------------------------------------------------------------------------
User Manual
Le caratteristiche tecniche possono subire variazioni senza preavviso. AUR°EL S.p.A. non si assume la responsabilità di danni causati dall’uso improprio del dispositivo.
---------------------------------------------------------------------------------------------------------------------------------------------------------------------
28/04/2020 AUR°EL S.p.A. Via Foro dei Tigli, 4 - 47015 Modigliana (FC) – ITALY
Tel.: [phone] Fax: [phone]
http://www.aurelwireless.com - email: [email protected] Pag7 di 17
Switching WRDN→
→→
→RX, WRDN→
→→
→TX, RX→
→→
→TX, TX→
→→
→RX.
In rder t respect latency time f PLL circuit and peak detect rs in data-slicer stage, it is mandat ry t
keep the timing in the f ll wing pictures, in switching fr m TX t RX, fr m RX t TX and fr m p wer d wn
t RX r TX.
Time chart WRDWN→
→→
→ RX
Figure 3

RTX-8L3V-FSK
RTX-8L3V-A
SK
---------------------------------------------------------------------------------------------------------------------------------------------------
User Manual
Le caratteristiche tecniche possono subire variazioni senza preavviso. AUR°EL S.p.A. non si assume la responsabilità di danni causati dall’uso improprio del dispositivo.
---------------------------------------------------------------------------------------------------------------------------------------------------------------------
28/04/2020 AUR°EL S.p.A. Via Foro dei Tigli, 4 - 47015 Modigliana (FC) – ITALY
Tel.: [phone] Fax: [phone]
http://www.aurelwireless.com - email: [email protected] Pag8 di 17
Time chart WRDWN→
→→
→ TX
Figure 4

RTX-8L3V-FSK
RTX-8L3V-A
SK
---------------------------------------------------------------------------------------------------------------------------------------------------
User Manual
Le caratteristiche tecniche possono subire variazioni senza preavviso. AUR°EL S.p.A. non si assume la responsabilità di danni causati dall’uso improprio del dispositivo.
---------------------------------------------------------------------------------------------------------------------------------------------------------------------
28/04/2020 AUR°EL S.p.A. Via Foro dei Tigli, 4 - 47015 Modigliana (FC) – ITALY
Tel.: [phone] Fax: [phone]
http://www.aurelwireless.com - email: [email protected] Pag9 di 17
Time chart RX→
→→
→ TX
Figure 5

RTX-8L3V-FSK
RTX-8L3V-A
SK
---------------------------------------------------------------------------------------------------------------------------------------------------
User Manual
Le caratteristiche tecniche possono subire variazioni senza preavviso. AUR°EL S.p.A. non si assume la responsabilità di danni causati dall’uso improprio del dispositivo.
---------------------------------------------------------------------------------------------------------------------------------------------------------------------
28/04/2020 AUR°EL S.p.A. Via Foro dei Tigli, 4 - 47015 Modigliana (FC) – ITALY
Tel.: [phone] Fax: [phone]
http://www.aurelwireless.com - email: [email protected] Pag10 di 17
Time chart TX→
→→
→ RX
Figure 6

RTX-8L3V-FSK
RTX-8L3V-A
SK
---------------------------------------------------------------------------------------------------------------------------------------------------
User Manual
Le caratteristiche tecniche possono subire variazioni senza preavviso. AUR°EL S.p.A. non si assume la responsabilità di danni causati dall’uso improprio del dispositivo.
---------------------------------------------------------------------------------------------------------------------------------------------------------------------
28/04/2020 AUR°EL S.p.A. Via Foro dei Tigli, 4 - 47015 Modigliana (FC) – ITALY
Tel.: [phone] Fax: [phone]
http://www.aurelwireless.com - email: [email protected] Pag11 di 17
Device Usage
T take advantage f the perf rmances detailed in the Technical Specificati ns, and in rder t c mply with
the perating c nditi ns which characterize the Certificati n, the transmitter must be fitted n a printed
circuit c nsidering the f ll wings:
DC Supply:
1. The transceiver must be supplied by a very l w v ltage s urce, safety pr tected against sh rt circuits.
Maximum v ltage variati ns all wed: 2.5÷3.6V.
2. De-c upling, next t the transmitter, by means f a minimum 100.000 pF ceramic capacit r.
3. Are preferable l w n ise linear v ltage regulat r circuits. Eventual v ltage regulat rs DC-DC r AC-DC
can intr duce disturbances n radi m dules.
Ground:
It must surr und at the best the welding area f the m dule. The circuit must be d uble layer, with
thr ugh ut vias t the gr und planes. Strip must be 2,7 mm wide f r 1,6 mm thick FR4 printed circuits and
1,6 mm wide f r 1 mm thick FR4 printed circuits.
Antenna:
Typical aerial is a whip antenna 8cm l ng with min secti n 0,5 mm
2
vertically p siti ned ver a widespread
r und plane. Other antenna p siti n (bend, helical) w rk with unpredictable perf rmance.
Figure 7
Other components:
1. D n t fit lines cl se t 50 hm antenna c nnecti n.
2. Keep the transmitter separate fr m all ther c mp nents f the circuit (m re than 5 mm).
3. Keep particularly far away and shielded all micr pr cess rs and their cl ck circuits.

RTX-8L3V-FSK
RTX-8L3V-A
SK
---------------------------------------------------------------------------------------------------------------------------------------------------
User Manual
Le caratteristiche tecniche possono subire variazioni senza preavviso. AUR°EL S.p.A. non si assume la responsabilità di danni causati dall’uso improprio del dispositivo.
---------------------------------------------------------------------------------------------------------------------------------------------------------------------
28/04/2020 AUR°EL S.p.A. Via Foro dei Tigli, 4 - 47015 Modigliana (FC) – ITALY
Tel.: [phone] Fax: [phone]
http://www.aurelwireless.com - email: [email protected] Pag12 di 17
Reference Rules
RTX-8L3V-FSK/ASK transceivers c mply with Eur pean set f rules EN 300 220, and EN 301 489.
The transceiver must be supplied by a very l w v ltage safety s urce pr tected against sh rt circuits. The
equipment can be utilized inside a special insulated h using t ensure the c mpliance with the EN 60950.
The use f the transceiver m dule is f reseen inside h usings that assure the verc ming f the pr visi n
EN 61000-4-2 n t directly applicable t the m dule itself. In particular, it is at the user’ s care the
insulati n f the external antenna c nnecti n, and f the antenna itself since the RF utput f the receiver is
n t built t directly bear the electr static charges f reseen by the ab ve menti ned pr visi n.
CE T 70-03 Recommendation
RTX-8L3V-FSK/ASK transceivers w rk in the harm nized frequency band and theref re, in rder t c mply
with rules in law, the maximum h urly duty cycle f the device must be the 10% (i.e. 6 minutes per h ur).
The suggested antenna implementati n (lambda/4 whip antenna) guarantees t verpass the rules in terms
f emitted p wer.

RTX-8L3V-FSK
RTX-8L3V-A
SK
---------------------------------------------------------------------------------------------------------------------------------------------------
User Manual
Le caratteristiche tecniche possono subire variazioni senza preavviso. AUR°EL S.p.A. non si assume la responsabilità di danni causati dall’uso improprio del dispositivo.
---------------------------------------------------------------------------------------------------------------------------------------------------------------------
28/04/2020 AUR°EL S.p.A. Via Foro dei Tigli, 4 - 47015 Modigliana (FC) – ITALY
Tel.: [phone] Fax: [phone]
http://www.aurelwireless.com - email: [email protected] Pag13 di 17
ower Supply Diagram
In Figure 8 it is displayed the diagram f current c nsumpti n in TX and RX m de versus v ltage supply. In
TX m de the current c nsumpti n has been measured driving high pin 4 (data in).
Figure 8

RTX-8L3V-FSK
RTX-8L3V-A
SK
---------------------------------------------------------------------------------------------------------------------------------------------------
User Manual
Le caratteristiche tecniche possono subire variazioni senza preavviso. AUR°EL S.p.A. non si assume la responsabilità di danni causati dall’uso improprio del dispositivo.
---------------------------------------------------------------------------------------------------------------------------------------------------------------------
28/04/2020 AUR°EL S.p.A. Via Foro dei Tigli, 4 - 47015 Modigliana (FC) – ITALY
Tel.: [phone] Fax: [phone]
http://www.aurelwireless.com - email: [email protected] Pag14 di 17
Thermal Diagrams
Thermal test has been c nducted at 3V v ltage supply.
Figure 9

RTX-8L3V-FSK
RTX-8L3V-A
SK
---------------------------------------------------------------------------------------------------------------------------------------------------
User Manual
Le caratteristiche tecniche possono subire variazioni senza preavviso. AUR°EL S.p.A. non si assume la responsabilità di danni causati dall’uso improprio del dispositivo.
---------------------------------------------------------------------------------------------------------------------------------------------------------------------
28/04/2020 AUR°EL S.p.A. Via Foro dei Tigli, 4 - 47015 Modigliana (FC) – ITALY
Tel.: [phone] Fax: [phone]
http://www.aurelwireless.com - email: [email protected] Pag15 di 17
Figure 10
Figure 11

RTX-8L3V-FSK
RTX-8L3V-A
SK
---------------------------------------------------------------------------------------------------------------------------------------------------
User Manual
Le caratteristiche tecniche possono subire variazioni senza preavviso. AUR°EL S.p.A. non si assume la responsabilità di danni causati dall’uso improprio del dispositivo.
---------------------------------------------------------------------------------------------------------------------------------------------------------------------
28/04/2020 AUR°EL S.p.A. Via Foro dei Tigli, 4 - 47015 Modigliana (FC) – ITALY
Tel.: [phone] Fax: [phone]
http://www.aurelwireless.com - email: [email protected] Pag16 di 17
Figure 12
Figure 13

RTX-8L3V-FSK
RTX-8L3V-A
SK
---------------------------------------------------------------------------------------------------------------------------------------------------
User Manual
Le caratteristiche tecniche possono subire variazioni senza preavviso. AUR°EL S.p.A. non si assume la responsabilità di danni causati dall’uso improprio del dispositivo.
---------------------------------------------------------------------------------------------------------------------------------------------------------------------
28/04/2020 AUR°EL S.p.A. Via Foro dei Tigli, 4 - 47015 Modigliana (FC) – ITALY
Tel.: [phone] Fax: [phone]
http://www.aurelwireless.com - email: [email protected] Pag17 di 17
Figure 14
User manual revision summary
Release date
Revision user
manual Changes from the previous revision
01/10/2018 1.0 First release