ATA5824C-PLQW

更新时间： 2024-02-17 12:13:29

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爱特美尔 - ATMEL		/
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ATA5824C-PLQW 数据手册

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

C₇

C₁₁

L₁

C₆

CDEM

RSSI

TEST3

SCK

RF_IN

SDI_TMDI

SDO_TMDO

CLK

C₅

AVCC

Microcontroller

433_N868

ATA5823/ATA5824

R₁

L₂

R_PWR

PWR_H

RF_OUT

IRQ

POUT

VSINT

VCC

VSS

C₈

XTAL2

C₁₀

C₉

Loop antenna

C₁

13.25311 MHz

C₃

C₂

Litihum-cell

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. C₁to C₃are 68 nF voltage supply blocking

capacitors. C₅is a 10 nF supply blocking capacitor. C₆is a 15 nF fixed capacitor used for the

internal quasi-peak detector and for the high-pass frequency of the data filter. C₇to C₁₁are RF

matching capacitors in the range of 1 pF to 33 pF. L₁is a matching inductor of about 5.6 nH to

56 nH. L₂is a feed inductor of about 120 nH. A load capacitor of 9 pF for the crystal is inte-

grated. R₁is 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 L₂and 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.

ATA5823/ATA5824

4829C–RKE–09/05

1...3 4 567 8 9...98

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