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Getting Started with the ATA5745/ATA5746 Evaluation Kit
1. Introduction
ATA5745/ATA5746 is a transparent receiver which can be applied to process the data for two different applications, tire pressure monitoring systems (TPMS) and remote keyless entry (RKE). The two systems can have a different data rate as well as modulation type. To handle different applications, ATA5745/ATA5746 can be switched very quickly between ASK and FSK modulation types, and, of course, between four different baud rate ranges. The ATA5745/ATA5746 Evaluation Kit was designed for evaluation purposes of the receiver. The receiver can be evaluated without a microcontroller since there are eight switches implemented for setting the receiver. The board is assembled for an operating voltage of 3V. For operation with a 5V power supply, the on-board external circuitry of the receiver's power supply has to be changed (please refer to the datasheet for more information on this issue). The RF input is matched to 50. This simplifies the verification of the input stage with standard RF instruments. Figure 1-1 on page 2 is a photo of an assembled board, Figure 1-2 on page 2 shows the layout of the the top layer, and Figure 1-3 on page 3 shows the allocation of the test pins (Jx, where x is an index) on the board. For each test pin there is a ground pin available in order to simplify measurement with an oscilloscope's probe. When measuring the clock signal, the load capacitance of the probe has to be taken to account. Table 1-1 on page 3 shows the information important for measurement purposes. The bill of materials for the board is listed in Table 1-4 on page 4.
ATA5745/ ATA5746 Evaluation Kit Application Note
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Figure 1-1.
Evaluation Board of the ATA5745/ATA5746
Figure 1-2.
Top Layer Layout of the ATA5745/ATA5746
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ATA5745/ATA5746 Evaluation Kit
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ATA5745/ATA5746 Evaluation Kit
Table 1-1. Mapping of the Board Components and Designators to the Pins of ATA5745/ATA5746
Designator and Description S-Ctl, enabl Rx, BR0 A/nF, BR1 CTRL_0, CTRL_1 Power supply of the board, VS = 3V Test pin to measure the clock signal. Connected to pin CLK_OUT over a 0 resistor (R2) (see Figure 1-3) The connector between VS3 and VS5 Test pin to measure the RSSI signal (see Figure 1-3) CLK_OUT VS5V, VS3V_AVCC RSSI The Corresponding Pin of the ATA5745/ATA5746 SENSE_CTRL, ENABLE RX, BR0 ASK_NFSK, BR1 CLK_OUT_CTRL_0, CLK_OUT_CTRL_1
Board Components SW1 SW2 SW3 SW4 J1 J2 J3 J9
J10 Note:
Test pin to measure the demodulated data. Connected to pin DATA_OUT over DATA_OUT a 0 resistor (R5) (see Figure 1-3)
The switches are double switches. One switch component (SWx) consists of two switches.
Figure 1-3.
Allocation of the Row Connectors (Test Pins) for Measurement Assembly
Test Pin
Ground
The following steps need to be followed to start working with the evaluation board: 1. Activate the 3V power supply. 2. Set switches enabl and Rx to "1" in order to start the receiver in receiving mode. 3. Set switches BR0 and BR1 according to Table 1-2 for the desired data rate to be processed by the receiver. Table 1-2.
BR1 0 0 1 1
The Receiver's Bit Rate Depends on the Combination of BR0 and BR1
BR0 0 1 0 1 BR_Range BR_Range0 BR_Range1 BR_Range2 BR_Range3 Recommended Bit Rate (Manchester) 1 kBit/s to 2.5 kBits/s 2 kBits/s to 5 kBits/s 4 kBits/s to 10 kBits/s 8 kBits/s to 10 kBits/s (ASK) 8 kBits/s to 20 kBits/s (FSK)
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4. Set switch A/nF as desired to set the modulation type of the receiver: "1" for ASK, or "0" for an FSK-modulated signal. 5. Set switch S-Ctl as desired for the sensitivity reduction's functionality. Set S-Ctl to LOW for normal sensitivity or HIGH for the sensitivity reduction functionality. The resistor on pin SENSE (R3) determines the value of the reduction. For more information, refer to the datasheet. 6. Set CTRL_0 and CTRL_1 as shown in Table 1-3 for the frequency of the clock signal to be measured on test pin J2. Table 1-3. The Functionality of the Pin CLOCK_OUT Depending on the Logic Combination of the Pins CTRL_0 and CTRL_1
CTRL_1 0 0 1 1 Note: CTRL_0 0 1 0 1 Function Pin CLK_OUT is switched off fCLK_OUT = fXTO / 3 fCLK_OUT = fXTO / 6 fCLK_OUT = fXTO / 12
fXTO at 433 MHz = 13.57375 MHz, fXTO at 315 MHz = 13.1433 MHz
Table 1-4.
Bill of Materials of the ATA5745/ATA5746
Pcs 315 MHz 433 MHz 1 4 1 2 3 1 1 1 1 4 4 1 x x x x x x x x x x x x x x x x x x Row connector Row connector SMB connector x x x x x x Value ATA5746 ATA5745 0 4.7 F 18 pF 10 nF 2.2 pF 15 nF 68 nH 36 nH 13.1433 MHz 13.57375 MHz JSK9-1G2-G0 800-10-012-10-001 800-10-012-10-001 Radiall(R) 2 pins/ 0.1 in. pitch 3 pins/ 0.1 in. pitch Q = 20 Q = 15 X7R X7R 0402CS 0402CS 0402 0402 0402 0402 0402 0402 CX-53G Coilcraft(R) Coilcraft Kyocera(R) Kinseki ITW/PANCON Heilind Electronics CAB CAB Radiall Tolerance Material/Series Housing QFN24 0402 Manufacturer/ Distributor Atmel(R) Murata(R)
Components IC1 R2, R3, R5 C2 C4, C5 C51, C52, C53 C7 C54 L1 XTAL1 SW1,SW2, SW3, SW4 J2, J3, J9, J10 J1 P3
R1, C6, C9, C11, n.m. C12, C55, FB1
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ATA5745/ATA5746 Evaluation Kit
4943A-AUTO-07/06
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4943A-AUTO-07/06

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