Applications
Benefits
• Automotive Keyless Entry and Passive Entry Go (Handsfree Car Access)
• Tire Pressure Monitoring Systems
• Remote Control Systems
• Alarm and Telemetering Systems
• Energy Metering
• Home Automation
• No SAW Device Needed in Key Fob Designs to Meet Automotive Specifications
• Low System Cost Due to Very High System Integration Level
• Only One Crystal Needed in System
• Less Demanding Specification for the Microcontroller Due to Handling of Power-down Mode,
Delivering of Clock and Complete Handling of Receive/Transmit Protocol and Polling
• Single-ended Design with High Isolation of PLL/VCO from PA and the Power Supply Allows a
Loop Antenna in the Key Fob to Surround the Whole Application
• Prevention against Relay Attack with Full-duplex Operation Mode
• Integration of Tire Pressure Monitoring, Passive Entry and Remote Keyless Entry
1. General Description
The ATA5823/ATA5824 is a highly integrated UHF ASK/FSK multi-channel half-duplex and
full-duplex transceiver with low power consumption supplied in a small 7 mm × 7 mm QFN48
package. The receive part is built as a fully integrated low-IF receiver, whereas direct PLL mod-
ulation with the fractional-N synthesizer is used for FSK transmission and switching of the power
amplifier for ASK transmission. The additional full-duplex mode makes relay attacks much more
difficult, since the attacker has to receive and transmit signals on the same frequency at the
same time.
The device supports data rates of 1 Kbit/s to 20 Kbit/s (FSK) and 1 Kbit/s to 10 Kbit/s (ASK) in
Manchester, Bi-phase and other codes in transparent mode. The ATA5824 can be used in the
433 MHz to 435 MHz band and the 867 MHz to 870 MHz band, the ATA5823 in the 313 MHz to
316 MHz band. The very high system integration level results in few numbers of external compo-
nents needed.
Due to its blocking and selectivity performance, together with a typical narrow-band key-fob loop
antenna with 15 dB to 20 dB loss, a bulky blocking SAW is not needed in the key fob application.
Additionally, the building blocks needed for a typical RKE and access control system on both
sides, the base and the mobile stations, are fully integrated.
Its digital control logic with self polling and protocol generation provides a fast challenge
response system without using a high-performance microcontroller. Therefore, the
ATA5823/ATA5824 contains a FIFO buffer RAM and can compose and receive the physical
messages themselves. This provides more time for the microcontroller to carry out other func-
tions such as calculating crypto algorithms, composing the logical messages and controlling
other devices. Due to that, a standard 4-/8-bit microcontroller without special periphery and
clocked with the delivered CLK output of about 4.5 MHz is sufficient to control the communica-
tion link. This is especially valid for passive entry go and access control systems, where within
less than 100 ms several communication responses with arbitration of the communication part-
ner have to be handled. It is hence possible to design bi-directional RKE and passive entry go
systems with a fast challenge response crypto function and prevention against relay attacks.
2
ATA5823/ATA5824
4829D–RKE–06/06
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