ATA5811 ATMEL Corporation, ATA5811 Datasheet - Page 8

• Manufacturer Part Number: ATA5811
• Description: Ata5811 Uhf Ask/fsk Transceiver
• Manufacturer: ATMEL Corporation

4. Typical Key Fob Application, 2 Batteries
Figure 4-1.
8
ATA5811/ATA5812
Typical RKE Key Fob Application, 433.92 MHz, 2 Batteries
Loop antenna
AVCC
C
10
Figure 4-1
nal components are 11 capacitors, 1 resistor, 2 inductors and a crystal. C
voltage supply blocking capacitors. C
nal voltage regulators. C
used for the internal quasi peak detector and for the highpass frequency of the data filter. C
C
5.6 nH to 56 nH. L
integrated. R
L
2
11
L
are RF matching capacitors in the range of 1 pF to 33 pF. L
1
C
5
C
C
shows a typical 433.92 MHz 2-battery RKE key fob or sensor application. The exter-
C
8
9
11
1
R
is typically 22 k and sets the output power to about 5.5 dBm.
1
2
is a feed inductor of about 120 nH. A load capacitor for the crystal of 9 pF is
C
7
NC
NC
NC
RF_IN
NC
433_N868
NC
R_PWR
PWR_H
RF_OUT
NC
NC
5
is a 10 nF supply blocking capacitor. C
ATA5811/ATA5812
C
1
+
+
C
2
2
Lithium cells
and C
C
3
4
are 2.2 µF supply blocking capacitors for the inter-
SDO_TMDO
DEM_OUT
SDI_TMDI
N_RESET
CDEM
VSINT
RSSI
SCK
CLK
IRQ
CS
NC
C
13.25311 MHz
6
XTAL2
C
1
3
is a matching inductor of about
6
is a 15 nF fixed capacitor
Microcontroller
VCC
1
and C
VSS
4689F–RKE–08/06
4
are 68 nF
7
to