Features • • • • • • • • • • • • • • • • • • • AES-128 Immobilizer Transponder for Use in Contactless Mode CMMI Certified. Configurable, Secure, Open Source Immobilizer Stack Energy Supply and Bi-directional Communication via LF Link (125 kHz) 32-bit Unique Identification Number Integrated Codecs for Enhanced LF Communication Range Fast AES-128 Cryptographic Engine for Both Immobilizer and RKE Functions Two 128-bit Secret Keys One 128-bit Transport Key Embedded Ultra-low-power Atmel® AVR® Microcontroller Fractional-N RF Transmitter Covering 315 MHz and 433 MHz 8-Kbyte Flash for User Application (6 Kbytes) and Immobilizer (2 Kbytes) 2112-byte EEPROM for User Data Storage (2 Kbytes) and Device Configuration (64 Bytes) Locking Mechanism Protects both Flash and EEPROM Contents Error Correction Code (ECC) Engine Protects both the Flash and EEPROM Units 1-wire Debug Interface Integrated with AVR Development Tools Automotive Grade C Compiler 1.9 to 3.6 V Battery Voltage Range (in Contact Mode) –40°C to +105°C Operating Temperature Small QFN 32 - 5x5 Package 1. Description Embedded AVR Microcontroller Including RF Transmitter and Immobilizer LF Functionality for Remote Keyless Entry ATA5795 is a smart Remote Keyless Entry (RKE) device that includes an embedded ultra-low-power AVR 8-bit microcontroller, a fractional-N RF transmitter and an LF immobilizer interface in a single QFN32 package. ATA5795 Furthermore, the device has an integrated AES-128 cryptography hardware engine, which is accessible by both the immobilizer and the RKE unit. The immobilizer interface can run in contactless mode, allowing energy supply and data transmission via the LF link. Summary The ATA5795 is designed for automotive applications that necessitate both immobilization and Remote Keyless Entry functions in one single key. It conforms to requirements of extremely low power consumption and provides all the necessary circuitry for the entire application. Preliminary NOTE: This is a summary document. The complete document is available. For more information, please contact your local Atmel sales office. 9182AS–RKE–03/10 1.1 System Block Diagram Figure 1-1. System Block Diagram Key Battery Car VBAT RF CBUF AVR T-Coil 16 15 14 13 12 11 10 9 17 8 18 7 19 6 RF-Receiver: 20 5 ATA5723/24/28 ATA5780 21 RFLoop antenna 2 ATA5795 4 22 3 23 2 24 1 25 26 27 28 29 30 31 32 Transponder Base Station: U2270, ATA5272 ATA5795 [Preliminary] 9182AS–RKE–03/10 ATA5795 [Preliminary] ATA5795 Block Diagram ATA5795 Block Diagram A4P A4N VCC VBAT Figure 1-2. Power Management SPI ECIN FRC-Oscillator EEPROM/ 2KB Contactless Interface/ Transponder VSRF 1.2 Clock Management and Monitoring RTC XTO XTO1 XTO2 Frac.-N PLL PC0 Watchdog Oscillator Volt. Monitor PD7/TM3 RF-Transmitter AVR-Core VCO PD6/TM2 PD5/TM1 Watchdog Timer IR-Driver PD3 Flash/8KB Timer Block PD0/INT0 IO-Ports GND PB0/NSS PB1/SCK PB2/MOSI PB4/TM4 CRC-Module PB3/MISO PB5/TM5 Crypto Unit PB7 XTAL1 Digital Control DebugWIRE PB6 XTAL2 Power Amplifier POR/BOD and Reset TME PD1/T3ICP SRAM/512B NRESET(DW) PD2/TEI ANT1 ANT2 GNDRF PD4/ECIN0 3 9182AS–RKE–03/10 2. Ultra-low-power AVR Microcontroller (ATA5795) 2.1 2.1.1 Features High Performance, Ultra-low-power AVR 8-bit Microcontroller Advanced RISC Architecture • • • • 131 Powerful Instruction 32 × 8 General Purpose Working Registers Fully Static Operation On-chip 2-cycle Multiplier Non-volatile Program and Data Memories • • • • 8 Kbytes of In-System Self-Programmable Flash with ECC 2112 Bytes of EEPROM with ECC 512-byte Internal SRAM Programming Lock for Software Security Peripheral Features • Programmable Watchdog/Interval Timer with Separate Internal Calibrated Ultra-Low-Power • • • • • • • • • • • • Oscillator Two 8-bit Timer/Counters: 1x with Compare Mode, 1x with Compare and Capture Mode Programmable Automatic Data Codec Power Management for Power Supply High Performance AES-128 Hardware Crypto Unit CRC Module Programmable Voltage Monitor Infrared (IR) Driver Stage to Control an External IR Transmitter Stage System Clock Management and Clock Monitoring Master/Slave SPI Serial Interface Integrated DebugWire Interface Interrupt and Wake-up on Pin Change 32-bit Unique Device Identification Number Analog Front End (AFE) and Power Management Features • Integrated Power Management that Automatically Handles the Two Power-supply Sources (Battery or 125 kHz Magnetic Field) • Contactless Interface for Power Supply and Bi-directional Data Communication Special Microcontroller Features • • • • • 4 Power-on Reset and Brown-out Detection Two Internal Calibrated RC Oscillators Real Time Clock (RTC) Module with Integrated Ultra-low-power 32 kHz Crystal Oscillator Circuit External and Internal Interrupt Sources Several Sleep Modes: Idle, Extended Power-save, Power-save and Power-down ATA5795 [Preliminary] 9182AS–RKE–03/10 ATA5795 [Preliminary] I/O and Package • 17 Programmable I/O Lines • Small QFN 32 - 5x5 Package RF-Transmitter • • • • • • • • • • • • • Pin Configurations PB2 PB1 ANT2 ANT1 PB0 PB7 Pin Out for QFN 32 Package XTO2 Figure 2-1. PB6 2.2 Fully Integrated Fractional-N PLL ASK and Closed Loop FSK Modulation Output Power up to +12.5 dBm from 300 to 450 MHz Current Consumption is Scaled by Output Power Programming Fast Crystal Oscillator Start-up Time of Typically 200 µs Low Current Consumption of Typically 7.3 mA at 5.5 dBm Just One 13.0000 MHz Crystal for 314.1 to 329.5 MHz and 424.5 to 439.9 MHz Operation Single-ended RF Power Amplifier Output Output Power from –0.5 to +12.5 dBm RF Frequency from 300 to 450 MHz with Different Crystals FSK Deviation with 396 Hz Resolution Data Rate up to 40 kbit/s (Manchester) Supports Multi-channel Operation 32 31 30 29 28 27 26 25 TME 1 24 PB3 XTO1 2 23 PD3 VSRF 3 22 PD4 GNDRF 4 21 PD5 NRESET 5 20 PD6 PC0 6 19 PD7 A4N 7 18 PB4 A4P 8 17 PB5 ATA5795 XTAL2 GND XTAL1 VCC PD2 PD1 PD0 VBAT 9 10 11 12 13 14 15 16 5 9182AS–RKE–03/10 Table 2-1. Pin Description Pin Number Pin Name Alternate Function 1 Alternate Function 2 1 TME - - 6 Function Comment Test mode enable 2 XTO1 - - Connection for RF crystal RF - pin 3 VSRF - - Power supply voltage RF RF - pin 4 GNDRF - - Power supply ground RF RF - pin 5 NRESET dW - Reset input / debugWire interface 6 PC0 - - I/O port 7 A4N - - Input pin for transponder AFE 8 A4P - - Input pin for transponder AFE 9 VBAT - - Power supply voltage for battery 10 PD0 INT0 PCINT8 I/O port / external interrupt input 0 Port D0 11 PD1 T3ICP PCINT9 I/O port / timer 3 external capture input Port D1 12 PD2 TEI PCINT10 I/O port / external timer input clock Port D2 13 VCC - - Power supply voltage for the microcontroller. A capacitor with capacitance CBUF must be connected at this pin to buffer the voltage during field supply and block the microcontroller VCC. 14 XTAL1 - - 32 kHz crystal oscillator input pin Port C0 15 GND - - Power supply ground 16 XTAL2 - - 32 kHz crystal oscillator output pin 17 PB5 TM5 PCINT5 I/O port / timer modulator pin 5 Port B5 18 PB4 TM4 PCINT4 I/O port / timer modulator pin 4 Port B4 19 PD7 TM3 PCINT15 I/O port / timer modulator pin 3 Port D7 20 PD6 TM2 PCINT14 I/O port / timer modulator pin 2 Port D6 21 PD5 TM1 PCINT13 I/O port / timer modulator pin 1 Port D5 22 PD4 ECIN0 PCINT12 I/O port / external clock input 0 Port D4 23 PD3 - PCINT11 I/O port Port D3 24 PB3 MISO PCINT3 I/O port / SPI Port B3 25 PB2 MOSI PCINT2 I/O port / SPI Port B2 26 PB1 SCK PCINT1 I/O port / SPI Port B1 27 ANT2 - - RF antenna 2 RF - pin 28 ANT1 - - RF antenna 1 RF - pin 29 PB0 NSS PCINT0 I/O port / SPI Port B0 30 PB7 - PCINT7 I/O port Port B7 31 PB6 - PCINT6 I/O port Port B6 32 XTO2 - - Connection for RF crystal RF - pin ATA5795 [Preliminary] 9182AS–RKE–03/10 ATA5795 [Preliminary] 3. Ordering Information Extended Type Number ATA5795-PNQW Package Remarks QFN32 - 5x5 Pb-free 4. Package Information Figure 4-1. QFN 32 - 5x5 Package Package: QFN_ 5 x 5_32L Exposed pad 3.6 x 3.6 Dimensions in mm Bottom Not indicated tolerances ±0.05 3.6±0.15 Top 32 25 32 1 24 1 17 17 8 Pin1 identification 5 Z 0.2 0.9±0.1 0.5 nom. 3.5 technical drawings according to DIN specifications Drawing-No.: 6.543-5124.01-4 Issue: 1; 28.11.05 9 0.4±0.1 Z 10:1 16 0.23±0.07 7 9182AS–RKE–03/10 Headquarters International Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131 USA Tel: 1(408) 441-0311 Fax: 1(408) 487-2600 Atmel Asia Unit 1-5 & 16, 19/F BEA Tower, Millennium City 5 418 Kwun Tong Road Kwun Tong, Kowloon Hong Kong Tel: (852) 2245-6100 Fax: (852) 2722-1369 Atmel Europe Le Krebs 8, Rue Jean-Pierre Timbaud BP 309 78054 Saint-Quentin-en-Yvelines Cedex France Tel: (33) 1-30-60-70-00 Fax: (33) 1-30-60-71-11 Atmel Japan 9F, Tonetsu Shinkawa Bldg. 1-24-8 Shinkawa Chuo-ku, Tokyo 104-0033 Japan Tel: (81) 3-3523-3551 Fax: (81) 3-3523-7581 Technical Support [email protected] Sales Contact www.atmel.com/contacts Product Contact Web Site www.atmel.com Literature Requests www.atmel.com/literature Disclaimer: The information in this document is provided in connection with Atmel products. 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