ATA5746-EK Microchip

APPLICATION NOTE Getting Started with the ATA5745/ATA5746 Evaluation Kit ATA5745/ATA5746 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 receivers 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 on page 2 is a photo of an assembled board, Figure 2 on page 2 shows the layout of the top layer, and Figure 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 oscilloscopes probe. When measuring the clock signal, the load capacitance of the probe has to be taken to account. Table 1 on page 3 shows the informa- tion important for measurement purposes. The bill of materials for the board is listed in Table 4 on page 4. 4943B-AUTO-07/15Figure 1. Evaluation Board of the ATA5745/ATA5746 Figure 2. Top Layer Layout of the ATA5745/ATA5746 2 ATA5745/ATA5746 Evaluation Kit APPLICATION NOTE 4943BAUTO07/15