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ATA5823 Datasheet(PDF) 6 Page - ATMEL Corporation |
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ATA5823 Datasheet(HTML) 6 Page - ATMEL Corporation |
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6 / 96 page  6 4829D–RKE–06/06 ATA5823/ATA5824 3. Typical Key Fob Application for Bi-directional RKE Figure 3-1. Typical Key Fob Application for Bi-directional RKE with 5 dBm TX Power, 433.92 MHz Figure 3-1 shows a typical 433.92 MHz RKE key fob application. The external components are 10 capacitors, 1 resistor, 2 inductors and a crystal. C 1 to C3 are 68 nF voltage supply blocking capacitors. C 5 is a 10 nF supply blocking capacitor. C6 is a 15 nF fixed capacitor used for the internal quasi-peak detector and for the high-pass frequency of the data filter. C 7 to C11 are RF matching capacitors in the range of 1 pF to 33 pF. L 1 is a matching inductor of about 5.6 nH to 56 nH. L 2 is a feed inductor of about 120 nH. A load capacitor of 9 pF for the crystal is inte- grated. R 1 is typically 22 kΩ and sets the output power to about 5.5 dBm. The loop antenna’s quality factor is somewhat reduced by this application due to the quality factor of L 2 and the RX/TX switch. On the other hand, this lower quality factor is necessary to have a robust design with a bandwidth that is wide enough for production tolerances. Due to the single-ended and ground-referenced design, the loop antenna can be a free-form wire around the application as it is usually employed in RKE unidirectional systems. The ATA5823/ATA5824 provides sufficient isolation and robust pulling behavior of internal circuits from the supply voltage as well as an integrated VCO inductor to allow this. Since the efficiency of a loop antenna is proportional to the square of the surrounded area, it is beneficial to have a large loop around the application board with a lower quality factor to relax the tolerance specification of the RF matching components and to get a high antenna efficiency in spite of their lower quality factor. VSINT POUT XTAL2 CLK TEST3 IRQ RSSI CDEM CS SCK SDI_TMDI SDO_TMDO RF_IN NC NC R_PWR RF_OUT 433_N868 PWR_H NC NC NC NC NC NC VCC VSS AVCC Loop antenna Microcontroller ATA5823/ATA5824 Litihum-cell C 1 C 9 C 8 C 10 C 5 C 11 C 6 C 3 + L 1 L 2 C 2 R 1 13.25311 MHz C 7 |
Similar Part No. - ATA5823_06 |
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Similar Description - ATA5823_06 |
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