Description The Atmel? ATA6843 and Atmel ATA6844 are system basis chips for three-phase brushless DC motor controllers designed in Atmel’s state-of-the-art 0.8μm SOI technology SMART-I.S.?1. In combination with a microcontroller and six discrete power MOSFETs， the system basis chip forms a BLDC motor control unit for automotive applications. In addition， the circuits provide a 3.3V/5V linear regulator and a window watchdog. The circuit includes various control and protection functions like overvoltage and overtemperature protection， short circuit detection， and undervoltage management. Thanks to these function blocks， the driver fulfils a maximum of safety requirements and offers a high integration level to save cost and space in various applications. The target applications are most suitable for the automotive market due to the robust technology and the high qualification level. Atmel ATA6844， in particular， is designed for applications in a high-temperature environment.