ATA5795C Embedded AVR Microcontroller Including RF Transmitter and Immobilizer LF Functionality for Remote Keyless Entry DATASHEET Features ● System solution for immobilizer and remote keyless entry functionality ● Optional integrated open source immobilizer software stack supports automotive immobilizer applications (CMMI certified) ● Integrated ultra-low power flash Atmel® AVR® (8-bit) microcontroller ● 2112-byte EEPROM ● 32-bit unique device identification number ● Available in small 5x5 QFN32 pin package Contactless Transponder ● LF contactless transponder operation in passive and active modes ● Integrated codecs for enhanced LF communication range ● Ultra low-power AES-128 cryptographic engine for use of immobilizer and RKE applications ● Access protected area for two 128-bit secret keys for device authentication ● Optional one 128-bit transport key for initial configuration ● LF receiver data integrity check (CRC-4/CRC-8) RF Transmitter ● Fully integrated fractional-N PLL, VCO and loop filter covering 315MHz and 433MHz (software programmable) ● Output power programmable from –0.5 to +12.5dBm ● Supports ASK and FSK modulation with data rate up to 40Kbit/s ● Extended battery lifetime due to fast start-up time, low operating voltage and low supply current This is a summary document. The complete document is available under NDA. For more information, please contact your local Atmel sales office.

Ultra-low-power AVR Microcontroller ● 8Kbyte flash program memory (including 2KB of immobilizer software stack) ● 2112-byte EEPROM – includes protected user data and device configuration data (64Bytes) ● Error correction code (ECC) engine protects flash and EEPROM ● 512Bytes of SRAM ● Four GP timers ● ● ● ● T0: Flexible WD and interval timers T1: 15-bit interval timer T2: Asynchronous 8-bit timer/counter with output compare T3: Asynchronous 8-bit timer/counter with output compare and input capture ● Power management unit ● System clock management and monitoring functions ● POR and brown-out detection...

Atmel® ATA5795C 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. 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 The Atmel ATA5795C is designed for automotive applications that necessitate both immobilization and remote keyless entry functions in one single key....

Atmel ATA5795C Block Diagram Figure 1-2. Atmel ATA5795C Block Diagram Volt. Monitor Timer Block Crypto Unit

Alternate Function 2 Function Test mode enable Power supply voltage RF Power supply ground RF Reset input / debugWire interface Power supply voltage for battery I/O port / external interrupt input 0 I/O port / timer 3 external capture input I/O port / external timer input clock 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. 32kHz crystal oscillator input pin Power supply ground 32kHz crystal oscillator output pin I/O port / timer modulator pin 5 I/O port...

Ordering Information Extended Type Number Package Information Top View D 32 technical drawings according to DIN specifications Side View Standard Singulation process b 09/07/11 TITLE Package Drawing Contact: [email protected]

Revision History Please note that the following page numbers referred to in this section refer to the specific revision mentioned, not to this document. Revision No. • Put datasheet in the latest template • Document completely redesigned

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