ata5780 ATMEL Corporation, ata5780 Datasheet - Page 3

• Manufacturer Part Number: ata5780
• Description: Uhf Ask/fsk Receiver
• Manufacturer: ATMEL Corporation

1.2.2
1.3
1.3.1
1.3.2
1.3.3
9207BS–RKE–01/11
Main Extended Features of the ATA5780
Typical Application Circuits
Outstanding RF Performance
Automatic Self-polling and Multi-channel Capability
Wake-up Scenario and ID Scanning
Figure 1-1.
The Atmel
ing blocking performance make a robust application against interferer possible in a low cost
design. The programmable channel filter bandwidth additionally provides flexibility to address
different system requirements.
The autonomous self-polling supports the automatic scanning of three different applications.
In the automotive car access market the Remote Keyless Entry (RKE), Tire Pressure Monitor-
ing System (TPMS), and Remote Start (RS) application can be supported with a single IC. In
addition, multi-channel systems of up to three frequencies can be used. All five different fre-
quencies can be scanned in the autonomous polling scheme, three frequencies for RKE, a
single frequency for TPMS, and also a single frequency for RS. Completely different and
unique configuration of each application type is supported. This is possible due to the flexibility
of the digital baseband and two different baseband reception paths. The IC can be operated
without having to be initial configured by an external microcontroller.
The baseband signal processing is designed to reduce host controller processing load. For
this purpose the receiver has to find the right telegram (message content) first before the host
controller is woken up. The criterion for the wake-up can be determined using a pattern and ID
within the telegram. Before the host controller is woken up, the receiver has to find both the
correct pattern in the preburst and the valid ID.
®
ATA5780 UHF receiver is highly sensitive. Its high image rejection and outstand-
1
2
3
4
5
6
7
8
Typical 5V Application Circuits
RFIN_LB
RFIN_HB
SPDT_RX
SPDT_ANT
N.C.
N.C.
N.C.
N.C.
ATEST
32
_IO1
9
31
10
TEST
_IO2
30
11
ATA5780
12
Atmel
29
13
28 27
Atmel ATA5780 [Preliminary]
14
26 25
15
TMDO_CLK
NPWRON4
VS = 4.5V to 5.5V
NPWRON5
NPWRON3
NPWRON2
CLK_OUT
TRPB
TMDO
TRPA
16
DGND
DVCC
MOSI
SCK
24
23
22
21
20
19
18
17
MISO
MOSI
NSS
SCK
Microcontroller
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