Microchip ATA5702F1000M-WDQW: A Comprehensive Technical Overview

The Microchip ATA5702F1000M-WDQW is a highly integrated, low-power system-on-chip (SoC) designed specifically for advanced Remote Keyless Entry (RKE) and Passive Entry Passive Start (PEPS) systems in the automotive sector. This device exemplifies the trend towards consolidating multiple RF and control functions into a single, robust package to enhance reliability and reduce the form factor of key fobs and automotive access modules.

At its core, the ATA5702 integrates a high-performance UHF ASK/FSK transmitter operating in the 315, 434, and 868 MHz frequency bands, making it a versatile solution for global automotive markets. A standout feature is its integrated SAW-less fractional-N PLL synthesizer, which eliminates the need for external Surface Acoustic Wave (SAW) filters and numerous other discrete components. This integration significantly simplifies the PCB design, reduces the Bill of Materials (BOM) cost, and minimizes the overall physical size of the end product.

The device is built around an efficient 8-bit microcontroller (MCU) core based on the AVR architecture. This core provides the necessary processing power to handle the application's protocol stack, security algorithms, and power management routines. For security, a critical aspect of any access system, the ATA5702 includes a hardware-based KeeLoq® code hopping encryption unit. This dedicated module ensures secure, encrypted communication between the key fob and the vehicle, protecting against replay and code-grabbing attacks without placing a significant computational load on the main MCU.

Power efficiency is paramount for key fob applications where battery life can span several years. The ATA5702 is engineered for ultra-low power consumption, featuring multiple power-down modes with current draw in the nanoampere range. This allows for extended operational life from a standard coin-cell battery. Furthermore, the chip supports a wide supply voltage range, ensuring stable performance even as the battery voltage decays over time.

The device is offered in a compact and rugged TSSOP-20 package, suitable for the harsh environmental conditions typical in automotive applications, including wide temperature ranges and physical shock. Its design emphasizes robustness and longevity.

ICGOODFIND: The Microchip ATA5702F1000M-WDQW is a premier SoC solution that masterfully combines an RF transmitter, MCU, and encryption hardware. Its high integration level, superior power management, and robust security features make it an exceptional choice for designers aiming to create compact, reliable, and secure next-generation automotive access systems.

Keywords: Remote Keyless Entry (RKE), Passive Entry Passive Start (PEPS), KeeLoq® Encryption, Ultra-Low Power Consumption, SAW-less Transmitter.