APPLICATION NOTE
UHF ASK/FSK Industrial Transmitter
ATA8401/ATA8402/ATA8403
ATA8401/ATA8402/ATA8403
Introduction
The ATA8401/ATA8402/ATA8403 are PLL transmitter ICs, which have been developed for
the demands of RF low-cost transmission systems for industrial applications at data rates
up to 50kBit/s ASK and 32kBit/s FSK modulation scheme. With these products Atmel®
offers the solution for the PLL transmitter for industrial market covering frequency ranges
310MHz to 350MHz with ATA8401, 429MHz to 439MHz with ATA8402 and 868MHz to
928MHz with ATA8403. The purpose of this application note is firstly to summarize some
important hints for the design using these transmitters and secondly to describe the Atmel
demo boards as well as the evaluation with the demo software.
9115B-INDCO-07/15
1.
Application Hints
1.1
Antenna Design, Layout and Matching
Different applications and of course different operation frequency ranges need different antenna solutions. Short Range
Device (SRD) in the ISM bands around 315MHz, 433.92MHz and 868MHz use mostly quarter-wave monopoles, helical
antennas, or printed small loop antennas. Antenna characteristic such as directivity, gain, polarization, impedance, and
bandwidth determine the system performance of the application. In addition to technical requirements, cost and the package
are the most significant parameters to consider for mass-production. Choosing an antenna design is for the most part a
compromise between cost, package, and technical requirements.
For the general application of hand-held wireless control transmitters, the printed “small” loop antenna is free of cost and its
size is smaller than a whip antenna. The loop antenna performance satisfies most system requirements, and it also has the
added benefit of hand-in sensitivity. A “small” loop antenna is an antenna with total loop length (circumference) of less than
one fifth of a wavelength (/5). (The rule of thumb is approximately tenth of the wavelength (/10).) Atmel’s demo board uses
a small loop antenna. Therefore, the equations in this application note are only valid for the small loop antenna.
For radiation, a loop antenna needs a strong current flowing through it in order to generate a magnetic field as the loop
antenna is a magnetic antenna. The radiation resistance of the antenna is a primary determiner of the antenna’s transmitted
power.
2
3 A
R Rad 31.2 10 ------4
Notes:
Equation 1
1.
A is the loop area in square meters
2.
is the wavelength in meter
A second important parameter of the antenna’s transmitted power is the loss of the loop antenna. This can be derived from
the skin depth theory under the assumption that the trace width is much greater than trace’s thickness, which is greater than
the skin depth. The loss resistance for a copper trace can be calculated with the following equation:
l
-7
R loss_loop ------- 2.59 10 f
2w
Notes:
Equation 2
1.
L is the total perimeter of the antenna in meters referring to the trace’s centre
2.
W is the trace width in meters
In order to estimate the transmit power using the loop antenna, it is necessary to determine the efficiency of the antenna.
This is given by:
R Rad
= -----------------------------------------------------------------R Rad + R loss_loop + R loss_cap
Notes:
Equation 3
1.
RRad is the radiation resistance of the antenna
2.
Rloss_loop is the loss resistance of the loop’s trace
3.
Rloss_cap is the loss of the capacitors for the matching
The radiated power can be calculated, as follows:
2
P Rad = I loop R Rad
Note:
Equation 4
Iloop is the current flow through the loop antenna
The relationship between the effective radiated power (ERP) and the IC’s output power (Pout,IC) driving the antenna is:
ERP = P out,IC
2
Equation 5
ATA8401/ATA8402/ATA8403 [APPLICATION NOTE]
9115B–INDCO–07/15
The equivalent circuit for the loop antenna is shown in Figure 1-1.
Figure 1-1. Equivalent Circuit of a Loop Antenna
RRad
Rloss
Loop
An estimation of the loop inductance is necessary to match the loop antenna. This value can be determined using a formula
for inductance of a polygon of general shape (Equation 6). This formula provides a result with 5% accuracy.
-7
8A
L = 2 10 l ln -------
lw
Notes:
1.
Equation 6
L is the loop perimeter
2.
A is the loop area
3.
W is the trace width of the loop antenna
The Q factor of the loop antenna is given by
L loop
Q loop = ---------------R loss
Equation 7
To optimize the performance of the loop antenna the following rules must be considered:
● The area enclosed by the loop has to be designed as large as possible and the ground area within the loop must be
small.
●
The field density increases towards the loop edges. Therefore, enough space must be provided near to the loop
edges.
●
The trace width of the loop antenna should not exceed 1.5 mm to avoid a large antenna Q factor.
Figure 1-2. Layout Design of the Loop Antenna
Ground
Ground
Loop
Antenna
Loop
Antenna
Ideal
Ideal
Suboptimal
Suboptimal
The Power Amplifier (PA) is an open collector output delivering a current pulse, which is nearly independent from the load
impedance. Therefore, the output power can be controlled via the connected load impedance. To achieve the maximum
output power, the PA’s output capacitance has to be compensated for by the reactive part of the load impedance so that all
the power will be delivered to the resistive load. The saturation of the PA’s output transistor is the limitation of the voltage
swing at matching. The PA’s matching principle is illustrated in Figure 1-3 on page 4. The open collector output stage of the
PA needs the DC current delivered by a low resistive path to the power supply (VS). This low resistive path will be provided
by connecting a feed inductor (RF choke) on the PA output (pin Ant1).
ATA8401/ATA8402/ATA8403 [APPLICATION NOTE]
9115B–INDCO–07/15
3
Figure 1-3. Principle of Power Amplifier Matching
V(t)
V(t)
VS
I(t)
Zload
optimum
Vce sat
I(t)
CPA_Out
I
The simple matching method of the loop antenna to the power amplifier is illustrated in Figure 1-4. The capacitors Cmatch1
and Cmatch2 transform the parallel resonance impedance (Z||) of the loop antenna to match the optimal load impedance of
the transmitter, Zload,opt. The optimum load impedance of each transmitter is:
ATA8401 requires Zload,opt of (255 + j192)
ATA8402 requires Zload,opt of (166 + j223)
ATA8403 requires Zload,opt of (166 + j226)
Figure 1-4. Matching Loop Antenna to the Power Amplifier
VS
ZII
RF
Choke
ANT1
RF
Choke
Cmatch2
Loop
Loop Antenna
ANT1
Zload
PA
PA
Rloss
CPA_Out
CPA_Out
Cmatch1
ANT2
ANT2
Rrad
Cmatch1
The parallel resonance impedance (Z||) can be calculated by equation 8.
Z II = Q loop 2fL loop
Equation 8
The variable r in the equation 9 describes the transformation ratio of the matching structure (Cmatch1,2).
2
Z II = r Z load
Equation 9
C match1 + C PA_Out C match2
1 C II = -----------------= ------------------------------------------------------------------------2
C match1 + C PA_Out + C match2
L loop
4
Equation 10
ATA8401/ATA8402/ATA8403 [APPLICATION NOTE]
9115B–INDCO–07/15
CII
Cmatch2
C match1 + C PA_Out + C match2
r = ------------------------------------------------------------------------- C match1 = r C II – C PA_Out
C match2
C match1 + C PA_Out
C match2 = ------------------------------------------r–1
Equation 11
Equation 12
In order to get lower influences of the capacitor's tolerance and to achieve an optimal matching with standard elements, two
capacitor are used in series for Cmatch2. The Cmatch1 has to be placed as close as possible to the IC to suppress the first
harmonic. The connection of the pin ANT2 to ground must be designed properly. The best practical way is to place several
vias direct to the ground plane of the board. This rule of ground connection is also valid for the ground connection of the
matching elements.
If a higher harmonic rejection is needed, an additional low-pass filter has to be designed between the loop antenna and the
transmitter. Figure 1-5 shows the principle schematic. The Cx must be placed as close as possible to the power amplifier
output.
Figure 1-5. Matching Structure of the Loop Antenna with an Additional Harmonic Rejection
VS
RF
Choke
LX
ANT1
PA
CX
CPA_Out
ANT2
Cmatch1
Caution:
Cmatch2
The formulas provide a theoretical start value for tuning of the real values on the application board.
ATA8401/ATA8402/ATA8403 [APPLICATION NOTE]
9115B–INDCO–07/15
5
1.2
Board Layout
The decoupling measure of the power supply is very important to minimize any disturbance in the internal circuit. It is
recommended that a capacitor X7R with a value of 68nF is placed between VS (pin 6) and GND (pin 7) of the transmitter.
The decoupling effect is better if the capacitor is placed as close as possible to the IC. The ground connection between the
decoupling capacitor and ground plane must be design properly.
Figure 1-6. Example for a Board Layout
Vbatt
Cd1
Cd3
L1
Cd2
Lx
XTAL
ANT1
VS
ANT2
GND
PA_EN
EN
CLK
CL
Cx
C
C
C
Figure 1-6 shows an example of an ideal layout. In this example, a crystal with a metal shielding is used. These types of
crystals generally have four pads. The two ground pads of the crystal must be connected to the board's ground plane
properly. The connection between the crystal and the pin XTO must be kept short. If the clock signal generated by the
transmitter is needed for the microprocessor, the trace between the pin CLK and the microprocessor pin must be as short as
possible. The layout in Figure 1-6 uses a discrete element as RF choke instead of the printed inductor as found on the demo
board. The discrete inductor needs less space than the printed one.
Notes:
1.
L1 is the RF choke
2.
Cd1 is the decoupling capacitor near the battery
3.
Cd2 is the decoupling capacitor for the transmitter's power supply
4.
Cd3 is the capacitor to bypass the high-frequency coupling from the power amplifier output into the transmitter's power supply. This capacitor must be placed near to the RF choke.
In a practical application, there are different supply voltages on the board, for example for the microprocessor and for the
transmitter. The different traces from the battery must be separated and decoupled to the ground.
6
ATA8401/ATA8402/ATA8403 [APPLICATION NOTE]
9115B–INDCO–07/15
1.3
The Setting of the Transmitter
Figure 1-7 shows the typical applications for the transmitters in ASK or FSK mode.
Figure 1-7. Typical Application Schematic
VS
VS
C2
C1
C1
RF
Choke
RF
Choke
XTAL
ANT1
XTAL
VS
ANT2
VS
ANT2
GND
PA_EN
GND
PA_EN
EN
CLK
EN
CLK
ATARx9x
ATARx9x
BPXY OSC1
BPXY OSC1
BPXY
VS
ANT1
VSS
BPXY
VDD
BPXY
S2
S1
a) ASK mode
VS
B42/
T20
BPXY
VSS
BPXY
VDD
BPXY
S2
S1
b) FSK mode
If ENABLE = Low and PA_ENABLE = Low, the circuit is in standby mode. To start the crystal oscillator (XTO), the pin
ENABLE must be switched on. At the same time the Phase Locked Loop (PLL) and the Clock Driver are active. To activate
the power amplifier, the pin PA_ENABLE must be set to high. After switching the pin ENABLE on, both the XTO circuit and
the PLL need a maximum of 1ms to reach a stable condition. Therefore, the application software has to wait at least 1ms
before switching the power amplifier on.
1.3.1
ASK (OOK) Transmission
The load capacitor of the crystal (C1 in Figure 1-7a) is used to adjust the desired RF transmit frequency. For ASK
modulation, the PA_ENABLE will be switched alternating between high and low voltage due to the data to be transmitted.
This results in the switching on and off of the power amplifier, which is known as OOK (On Off Keying).
1.3.2
FSK Transmission
The crystal pulling method is used for the FSK modulation (seeFigure 1-7b). An additional capacitor C2 will be used to
modulate the crystal resonance frequency due to the data to be transmitted. For this purpose the capacitor C2 will be
connected to the capacitor C1 related to the data. In practical terms this is a connection between capacitor C2 and the open
drain port of a microprocessor. In the event of modulation, the microprocessor switches the capacitor C2 alternately between
high impedance condition and ground. This method pulls the crystal's series resonance frequency between two values,
which results in the RF operating frequency.
ATA8401/ATA8402/ATA8403 [APPLICATION NOTE]
9115B–INDCO–07/15
7
1.4
Crystal Oscillator
The crystal oscillator uses the crystal’s series resonance frequency to generate the reference frequency. The series
connection of the crystal and the load capacitor results in an impedance ZXTAL seen from the pin XTAL (pin 5). According to
the crystal’s specification, the crystal will oscillate on the loaded resonance frequency fL, in which the impedance ZXTAL is
real. This means the imaginer part of the impedance Im{ZXTAL} is 0.
The impedance ZXTO is the large signal input impedance of the XTO seen into the pin XTAL (pin 5) in steady state oscillation.
For the oscillation start-up, the following conditions must be fulfilled (see Figure 1-8).
Im{ZXTO + ZXTAL} = 0
Equation 13
Re{ZXTO + ZXTAL} < 0
Equation 14
Figure 1-8. Condition for Oscillation Start Up
VS
ZXTAL
CL
XTAL
ZXTO
XTAL
To achieve the condition described by equation 13 at the specified loaded crystal frequency, the capacitance CL can be
determined as:
1
C L = -----------------------------------------2f L lm Z XTAL
Equation 15
With lm{ZXTAL} = –lm{ZXTO}
In real applications, there are stray capacitances on the board have to be taken into account when determining the load
capacitance.
If FSK modulation is used, the crystal-loaded resonance frequency is pulled by two different capacitance values (CL1 and
CL2) due to the data. Figure 1-9 shows the principle circuit for FSK modulation. The frequency deviation can be estimated
using formula 16.
Figure 1-9. Circuitry for FSK Modulation
VS
ZXTAL
CL1
CL2
XTAL
ZXTO
XTAL
C1
C2
Cswitch
2f
lm ZXTAL = -lm ZXTO – ----------------f L C M
Notes:
Equation 16
1.
f is the ± frequency deviation in ppm
2.
CM is the motional capacitance of the crystal.
When determining C1 and C2, Cswitch of the microprocessor’s pin must be considered. If the switch is open, the Cswitch must
be taken into account in the calculation of the series resonance resistance Re{ZXTAL}. If the switch is closed, the on
resistance of the modulating port of the microprocessor must be taken into account.
Caution:
8
The formulas provide a theoretical start value for tuning of the real values on the application board.
ATA8401/ATA8402/ATA8403 [APPLICATION NOTE]
9115B–INDCO–07/15
2.
The Demo Board
2.1
Peripheral Interfaces
2.1.1
Clock Output
The transmitter provides a clock signal with a crystal accuracy, which can be used as reference for an external
microprocessor. The frequency of the clock signal is:
f XTO
f CLK = ----------256
Equation 17
The clock output signal is CMOS-compatible if the load capacitance on the pin CLK (pin 1) is lower than 10pF. Hence, the
trace connecting the pin CLK and the microprocessor port must be as short as possible.
Atmel’s microprocessors M44C090, M44C890, and T48C893 have a special feature to take over an external clock signal. In
real applications with the Atmel’s transmitters, the microprocessor starts with a RC oscillator to switch the transmitter. After
the clock signal has stabilized, the microprocessor takes over the clock signal as reference. The demo board ATAB8401,
ATAB8402, and ATAB8403 use Atmel’s microprocessor T48C893
2.1.2
Port Configuration of the Microprocessor
The transmitter pins EN and PA_EN must be connected to the CMOS-compatible output stage. To ensure that the
transmitter is in power-down mode during the microprocessor reset, a pull-down resistor must be applied. For the switches
on the demo board, a pull-up resistor is needed.
With FSK modulation, the modulating port of the microprocessor must be properly defined. The on resistance of the port
must be very small so that the maximum series resonance of the crystal circuit does not exceed the defined value. Either a
pull-up or pull-down resistor is needed for this port. The port must be set in an open-drain high-current configuration.
Table 2-1.
Port Configuration of T48C893 on the Demo Board
Port
Function
Output Driver
Pull-up/Pull-down Resistor
BP20/NTE
Programming
CMOS
Pull-down
BP21
Pin EN of the transmitter
CMOS
Pull-down
BP23
LED D1
CMOS
Pull-down
BP40/SC/INT3
Switch S3/programming
CMOS
Pull-up
BP42/T2O
FSK modulation switch/
programming
Open drain
None
BP43/SD/INT3
Programming
CMOS
Pull-down
BP50/INT6
Switch S2
CMOS
Pull-up
BP53/INT1
Switch S1
CMOS
Pull-up
BP60/T3O
Pin PA_EN of the transmitter
CMOS
Pull-down
ATA8401/ATA8402/ATA8403 [APPLICATION NOTE]
9115B–INDCO–07/15
9
2.2
DC Feed Inductor for the Power Amplifier
Atmel’s demo boards use a printed inductor on PCB (L1) to reduce the cost of the external components. This inductor
provides a DC current for the open collector stage of the power amplifier. The value of L1 must be between 50nH to 100nH.
Formula 18 gives approximation of the inductance for a printed inductor (see Figure 2-1).
L = 49.2 n2 rm
Notes:
Equation 18
1.
L is in nH
2.
N is number of turns
3.
Rm is mean radius in cm
Figure 2-1. Printed Inductor
rm
A printed inductor on PCB can be expressed as a parallel circuit of inductor, capacitor, and resistor. The printed inductor of
the transmitter’s demo board can be estimated as 90nH || 0.3pF || 2.8k.
10
ATA8401/ATA8402/ATA8403 [APPLICATION NOTE]
9115B–INDCO–07/15
Schematic of the Demo Board
Figure 2-2. The Schematic of the Demo Board
Loop Antenna
w = 1.5 mm
VS
C4
Q1
5
C1
VS
C2
BA2032SM
ANT2
GND
EN
BR1
L2
4
C10
3
2
PA_EN
BR3
C5
BR4
C7
C6
BR2
1
CLK
C9
U2
T48C893N
C8
3
4
5
6
7
8
S3
9
1
2
3
4
10
BP42/T2O
BP52/INT1
BP41/T2I/VMI
BP51/INT6
BP23
BP53/INT6
BP22
OSC1
BP21
OSC2
BP20/NTE
BP50/T3O
BP63/T3I/INT5
BP10
BP13
B8
2
BP43/SD/INT3
BP53/INT1
B7
1
BP40/SC/INT3
A8
4
S2
VSS
B6
3
VDD
A7
2
B5
1
A6
4
B4
3
A5
2
B3
1
A4
S1
B2
2
8
VCC
A3
-
C3
7
ANT1
B1
1
6
VS
XTAL
A2
+
L2
Printed Coil
U1
T5750
A1
2.3
20
19
18
17
16
15
14
R1
D1
13
12
11
X1
VS
The demo board is designed for three different transmitters, T5750, T5753, T5754, ATA8401, ATA8402, and ATA8403. The
smaller loop antenna is designed for radiating 868MHz and 915MHz Frequency.
ATA8401/ATA8402/ATA8403 [APPLICATION NOTE]
9115B–INDCO–07/15
11
2.4
Demo Board’s Layout
Figure 2-3. Top Layer of the Demo Board
Figure 2-4. Bottom Layer of the Demo Board
12
ATA8401/ATA8402/ATA8403 [APPLICATION NOTE]
9115B–INDCO–07/15
2.5
BOM List
Table 2-2.
Bill of Materials of the Demo Board
915Mhz
868.3MHz
433.92Mhz
Components pcs
315Mhz
Components List Transmitter Application Board
ATAB8401 (315MHz)/ATAB8402 (433.92MHz)/ATAB8403-8 (868.3MHz)/ATAB8403-9 (915MHz)
X
U1
U2
1
1
X
X
X
X
X
X
T48C893N
X
9.843750MHz
13.560000MHz
13.567187MHz
14.296875MHz
X
4.7pF/50V
6.8pF/50V
8.2pF/50V
C3
1
X
1
X
0.1pF
0.1pF
0.1pF
GRM1885C1H4R7B
GRM1885C1H6R8B
GRM1885C1H8R2B
Size 0603
muRata®
5%
0.1pF
0.1pF
GRM1885C1H120J
GRM1885C1H6R8B
GRM1885C1H4R7B
Size 0603
muRata
X
12pF/50V
6.8pF/50V
4.7pF/50V
X
68nF/25V
10%
GRM21BR71E683K
Size 0805
muRata
5%
0.1pF
0.1pF
GRM1885C1H150J
GRM1885C1H6R8B
GRM1885C1H1R5B
Size 0603
muRata
X
15pF/50V
6.8pF/50V
1.5pF/50V
0.1pF
0.1pF
0.1pF
0.1pF
GRM1885C1H8R2B
GRM1885C1H3R9B
GRM1885C1H1R2B
GRM1885C1H1R0B
Size 0603
muRata
X
8.2pF/50V
3.9pF/50V
1.2pF/50V
1.0pF/50V
5%
0.1pF
0.1pF
0.1pF
GRM1885C1H150J
GRM1885C1H6R8B
GRM1885C1H1R5B
GRM1885C1H1R0B
Size 0603
muRata
X
15pF/50V
6.8pF/50V
1.5pF/50V
1.0pF/50V
X
100nF/25V
10%
GRM21BR71E104K
Size 0805
muRata
1nF/50V
10%
GRM188R71H102K
Size 0603
muRata
n.m.
0.3pF
0.5pF
0.05pF
0.05pF
04023j0R3ABW
04023j0R5ABW
Size 0402
Size 0402
AVX®
AVX
LL1608-FS
LL1608-FS
Size 0603
Size 0603
TOKO®
TOKO
Size 0603
e.g. Vishay®
P-LCC-2
Vishay
0 bridge
Size 0603
e.g. Vishay
X
X
X
C4
n.m.
X
C5
1
X
X
X
C6
X
1
X
X
C7
Atmel
ACAL
X
C2
TSSOP8
HC-49/U4B
X
X
Manufacturer/
Distributor
Atmel
X
1
Housing
SSO20
X
C1
Material/Series
Order No.: 4730007881
Order No.: 4730007882
Order No.: 4730007557
Order No.: 4730007559
X
1
Tolerance
ATAB8401
ATAB8402
ATAB8403
X
X
Q1
Value
X
1
C8
1
C9
1
C10
1
X
X
X
X
X
X
X
X
X
X
L2
1
X
1.8nH
33nH
18
0 bridge
R1
1
X
X
X
X
1k/0.1W
D1
1
X
X
X
X
SMD LED red
BR1
1
X
X
BR2
1
X
X
0 bridge
Size 0603
e.g. Vishay
BR3
1
X
X
0 bridge
Size 0603
e.g. Vishay
BR4
1
X
X
0 bridge
Size 0603
e.g. Vishay
X
X
5%
TLMK3100
ATA8401/ATA8402/ATA8403 [APPLICATION NOTE]
9115B–INDCO–07/15
13
Table 2-2.
Bill of Materials of the Demo Board (Continued)
915Mhz
868.3MHz
433.92Mhz
Components pcs
315Mhz
Components List Transmitter Application Board
ATAB8401 (315MHz)/ATAB8402 (433.92MHz)/ATAB8403-8 (868.3MHz)/ATAB8403-9 (915MHz)
Value
Tolerance
Material/Series
Housing
Manufacturer/
Distributor
S1, S2, S3
3
X
X
X
X
SMD switch
KSC 241J
ITT Cannon®/
Spoerle
Electronic
VBatt1
1
X
X
X
X
Battery holder
BA2032SM
Roßmann
Electronic
CR2032
e.g. SONY®/
Roßmann
Electronic
Stocko®/
Hoppe
Electronic
Lithium cell
14
1
X
X
X
X
3V/220mAh
PCB jack
1
X
X
X
X
8 pins
MKFL13478-6-0808
PCB
1
X
X
X
X
T5750/53/54
V4.0
FR4
ATA8401/ATA8402/ATA8403 [APPLICATION NOTE]
9115B–INDCO–07/15
Thickness
1.2mm
3.
Operating of Transmitter Demo board with RF Design Kit
Transmitter demo boards ATAB8401/02/03 show the feature ISP (in system programmable) and can be used as an example
of a stand-alone RF remote control transmitter that offers ASK and FSK modulation. To evaluate the transmitter, Atmel offers
a microprocessor board ATAB-RFMB (ATAB-STKFLamingo) to configure the IC as well as the evaluation software RF
Design Kit. This section provides some important information needed to start the evaluation with the microcontroller board.
For the complete description of both RF Design Kit and ATAB-RFMB (ATAB-STKFlamingo), please refer to the application
notes “ATAK57xx and ATAK862xx hardware description” and “ATAK57xx, ATAK57xx-F, ATAK862xx and ATAK862xx-F
software description”.
Technical features:
● Power supply: 3V Lithium cell (e.g. CR2032)
●
●
●
●
●
●
Frequency deviation: approximately. 30kHz
Printed loop antenna
Three programmable buttons
No hardware changing is necessary for the verification of two different modulation schemes.
In-system configuration of the software setting to the EEPROM of the microcontroller T48C893N is possible using the
programming adapter JP1
The transmitter demo board is tested under the ETSI as well as FCC regulation. The test results show that the
transmitter can be applied in real applications and pass the type approval
Configuration of the transmitter:
● Connect the microcontroller board (ATAB-RFMB or ATAB-STKFlamingo) to a PC using a serial link cable (RS232).
Please use the free serial port (Com1 or Com2).
●
●
●
●
●
Switch on the 12V power supply of the microcontroller board
Start the RF Design Kit software (see Figure 3-1 on page 16)
Select the transmitter drop-down menu to choose the setting of a transmitter. The setting software for T5750/53/54 is
the same as for verification with ATA8401/ATA8402/ATA8403. (Figure 3-2 on page 16)
●
Choose T5753 (315MHz) for configuration of ATAB8401
●
Choose T5754 (315MHz) for configuration of ATAB8402
●
Choose T5750 (868MHz) for configuration of ATAB8403-8
●
Choose T5750 (915MHz) for configuration of ATAB8403-9
Remove the lithium cell battery from the holder
Plug the transmitter into the adapter PCB of the microcontroller board
ATA8401/ATA8402/ATA8403 [APPLICATION NOTE]
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15
Figure 3-1. Windows Interface of RF Design Kit
Figure 3-2. Selecting the Setting of a Transmitter (Setting for ATAB5750-8 and ATAB8403-8)
●
●
16
Set the desired transmitter’s setting (see Figure 3-2)
Please follow the instructions below “Getting started evaluating the transmitter board”
ATA8401/ATA8402/ATA8403 [APPLICATION NOTE]
9115B–INDCO–07/15
Figure 3-3. Several Setting Menu to Configure the Transmitter
Getting started evaluating the transmitter board:
● Insert the lithium cell battery into the holder.
●
Activate the transmitter by the pushing the S1 or S2 button (without programming the transmitter board, the default
setting will be activated)
●
●
●
Activate one of the three buttons for the required function.
The “continuous” transmission setting, the board will send the signal approximately 30s long.
The start of each function and the end of the continuous function will be indicated by LED D1 switched on.
Default configuration:
● Modulation: FSK
●
●
●
Data Rate: 1kBps
Test word: F09AF09A
Button functions:
●
●
●
●
S1 continuous telegram
S2 single telegram
S3 continuous preburst
Preburst length is set to the value matching the Polling setting of the suitable receiver.
Reference:
Constantine Balanis, Antenna Theory, Analysis and Design, Second Edition, John Wiley & Sons, 1997
Frederick Grover, Inductance Calculations Working Formulas and Tables, Dover Publications, 1946.
ATA8401/ATA8402/ATA8403 [APPLICATION NOTE]
9115B–INDCO–07/15
17
4.
Revision History
Please note that the following page numbers referred to in this section refer to the specific revision mentioned, not to this
document.
18
Revision No.
History
9115B-INDCO-07/15
Put document in the latest template
ATA8401/ATA8402/ATA8403 [APPLICATION NOTE]
9115B–INDCO–07/15
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