ATA5823-PLQW

ATA5823-PLQW Datasheet


Carrier Level MHz<br>• Low Supply Current mA in RX and TX Mode 3V/TX with 5 dBm/433.92 MHz<br>• Data Rate 1 to 20 Kbit/s Manchester FSK, 1 to 10 Kbit/s Manchester ASK<br>• ASK/FSK Receiver Uses a Low IF Architecture with High Selectivity, Blocking and Low

Part Datasheet
ATA5823-PLQW ATA5823-PLQW ATA5823-PLQW (pdf)
Related Parts Information
ATA5824-PLQW ATA5824-PLQW ATA5824-PLQW
ATA5823-PLQW 80 ATA5823-PLQW 80 ATA5823-PLQW 80
ATA5824-PLQW 80 ATA5824-PLQW 80 ATA5824-PLQW 80
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• Full-duplex Operation Mode without Duplex Frequency Offset to Prevent the Relay Attack against Passive Entry Go PEG Systems
• High FSK Sensitivity dBm at 20 dBm at Kbit/s MHz
• High ASK Sensitivity dBm at 10 dBm at Kbit/s 100% ASK,

Carrier Level MHz
• Low Supply Current mA in RX and TX Mode 3V/TX with 5 dBm/433.92 MHz
• Data Rate 1 to 20 Kbit/s Manchester FSK, 1 to 10 Kbit/s Manchester ASK
• ASK/FSK Receiver Uses a Low IF Architecture with High Selectivity, Blocking and Low

Intermodulation Typical 3 dB Blocking dBC at ±750 kHz/60.5 dBC at MHz and 67 dBC at ±10 MHz, System I1dBCP = dBm/System IIP3 = dBm
• Wide Bandwidth AGC to Handle Large Outband Blockers above the System I1dBCP
• 226 kHz IF Intermediate Frequency with 30 dB Image Rejection and 220 kHz System Bandwidth to Support TPM Transmitters using ATA5756/ATA5757 Transmitters with Standard Crystals
• Transmitter Uses Closed Loop FSK Modulation with Fractional-N Synthesizer with High PLL Bandwidth and an Excellent Isolation between PLL and PA
• Tolerances of XTAL Compensated by Fractional-N Synthesizer with 800 Hz RF Resolution
• Integrated RX/TX-Switch, Single-ended RF Input and Output
• RSSI Received Signal Strength Indicator
• Communication to Microcontroller with SPI Interface Working at 500 kBit/s Maximum
• Configurable Self Polling and RX/TX Protocol Handling with FIFO-RAM Buffering of Received and Transmitted Data
• 1 Push Button Input and 1 Wake-up Input are Active in Power-down Mode
• Integrated XTAL Capacitors
• PA Efficiency up to 38% MHz/10 dBm/3V
• Low In-band Sensitivity Change of Typically dB within ±75 kHz Center Frequency Change in the Complete Temperature and Supply Voltage Range
• Fully Integrated PLL with Low Phase Noise VCO, PLL Loop Filter and full support of multi-channel operation with arbitrary Channel distance due to Fractional-N Synthesizer
• Sophisticated Threshold Control and Quasi-peak Detector Circuit in the Data Slicer
• MHz, MHz and 315 MHz without External VCO and PLL Components
• Efficient XTO Start-up Circuit > kΩ Worst Case Start Impedance
• Changing of Modulation Type ASK/FSK and Data Rate without Component Changes to Allow Different Modulation Schemes in TPM and RKE
• Minimal External Circuitry Requirements for Complete System Solution
• Adjustable Output Power 0 to 10 dBm Adjusted and Stabilized with External Resistor, Programmable Output Power with 0.5dB Steps with Internal Resistor
• Clock and Interrupt Generation for Microcontroller
• ESD Protection at all Pins kV HBM, ±200V MM, ±500V FCDM
• Supply Voltage Range 2.15V to 3.6V or 4.4V to 5.25V
• Typical Power-down Current < 10 nA
• Temperature Range to +105°C
• Small 7 mm x 7 mm QFN48 Package

UHF ASK/FSK Transceiver

ATA5823 ATA5824
• 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

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 x 7 mm QFN48 package. The receive part is built as a fully integrated low-IF receiver, whereas direct PLL modulation 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 components 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 functions 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 MHz is sufficient to control the communication 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 partner 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

ATA5823/ATA5824

Figure System Block Diagram

Antenna

ATA5823/ATA5824

RF Transceiver

Digital Control Logic

Power Supply

Matching/ RF Switch

Microcontroller interface
4 to 8

Microcontroller

Pin Configuration

Figure Pinning QFN48

NC RX_ACTIVE N_PWR_ON SCK_PHA SCK_POL NC PWR_ON RX_TX1 RX_TX2 CDEM

NC RF_IN NC 433_N868 NC R_PWR PWR_H RF_OUT NC
48 47 46 45 44 43 42 41 40 39 38 37

ATA5823/ATA5824 31
13 14 15 16 17 18 19 20 21 22 23 24

RSSI CS TEST3 SCK SDI_TMDI SDO_TMDO CLK IRQ POUT VSINT NC XTAL2

NC AVCC VS2 VS1 SETPWR TEST1 DVCC CS_POL TEST2 TXAL1

Table Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41

Pin Description Symbol NC RF_IN NC 433_N868 NC R_PWR PWR_H RF_OUT NC AVCC VS2 VS1 SETPWR TEST1 DVCC CS_POL TEST2 XTAL1 XTAL2 NC VSINT POUT IRQ CLK

SDO_TMDO SDI_TMDI

SCK TEST3

CS RSSI CDEM RX_TX2 RX_TX1 PWR_ON NC

Function Not connected Not connected Not connected RF input Not connected Selects RF input/output frequency range Not connected Resistor to adjust output power Pin to select output power RF output Not connected Not connected Not connected Not connected Not connected Blocking of the analog voltage supply Power supply input for voltage range 4.4V to 5.6V Power supply input for voltage range 2.15V to 3.6V Internal Programmable Resistor to adjust output power Test input, at GND during operation Blocking of the digital voltage supply Select polarity of pin CS Test input, at GND during operation Reference crystal Reference crystal Not connected Microcontroller interface supply voltage Programmable output Interrupt request Clock output to connect a microcontroller Serial data out/transparent mode data out Serial data in/transparent mode data in Serial clock Test output open during operation Chip select for serial interface Output of the RSSI amplifier Capacitor to adjust the lower cut-off frequency data filter Has to be connected GND Switch pin to decouple LNA in TX mode RKE mode Input to switch on the system active high Not connected
Ordering Information

Extended Type Number ATA5823-PLQW ATA5824-PLQW

Package QFN48

Package Information

Package QFN 48 - 7 x 7 Exposed pad x

Dimensions in mm Not indicated tolerances ±
1 max.

Remarks 7 mm x 7 mm, Pb-free 7 mm x 7 mm, Pb-free
37 36
25 24
technical drawings according to DIN specifications
nom.

Drawing-No. Issue 1;

History
4829D-RKE-06/06
• Put datasheet in a new template
• kBaud replaced through Kbit/s
• Baud replaced through bit
• Table 14-8 “Interrupt Handling” on page 70 changed
96 ATA5823/ATA5824

ATA5823/ATA5824

Table of Contents
Features 1 Applications 2 Benefits 2 1 General Description 2 Pin Configuration 3 Typical Key Fob Application for Bi-directional RKE 6 4 Typical Car Application for Bi-directional RKE 7 5 Typical Key Fob Application for Full-duplex PEG 8 6 Typical Car Application for Full-duplex PEG 9 7 RF Transceiver in Half-duplex Mode 10 8 RF Transceiver in Full-duplex Mode 25 9 XTO 27 10 Power Supply 31 11 Microcontroller Interface 35 12 Digital Control Logic 35 13 Transceiver Configuration 47 14 Operation Modes 52 15 Absolute Maximum Ratings 71 16 Thermal Resistance 71 17 Electrical Characteristics General 72 18 Electrical Characteristic Battery Application 86 19 Electrical Characteristics Car Application 88 20 Digital Timing Characteristics 90 21 Digital Port Characteristics 94 22 Ordering Information 96 23 Package Information 96

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Datasheet ID: ATA5823-PLQW 519190