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Atmel now offers the ATA6843 and ATA6844, highly-integrated system basis gate driver ICs designed for three-phase brushless DC motor control applications, including turbo chargers, pumps and EGR.

Other motor control applications include waste gates, fans, power window, power doors and power seats.

The ATA6843 and ATA6844 feature six output stages for direct motor control when combined with an Atmel AVR microcontroller (MCU) and an on-chip Atmel automotive LIN transceiver IP for in-car communication.

According to Atmel, the new driver ICs incorporate all the essential functional blocks to supply and monitor a microcontroller in BLDC motor-control applications.

This feature enables a smaller footprint for applications with limited space and increases the overall system safety.

With most automotive BLDC motor applications located in hot under-the-hood environments, the ability to withstand extremely hot temperatures is a device requirement.

The Atmel ATA6844 is a high-temperature version to operate at chip temperatures of up to 200C.

It is manufactured in Atmel’s own BCD-on-SOI technology Smart-I.S for extreme temperatures and enables direct attachment of the ECU to hot actuators for short wiring and optimised construction.

Atmel automotive-qualified AVR microcontrollers are suited to supporting the new system basis gate driver ICs in various BLDC motors with Hall sensors as well as sensorless BLDC motors with back-electromagnetic force (BEMF) sensing.

With the devices’ six input stages, the MCU individually controls each of the six output stages.

The MCU also defines the adjustable over current detection threshold of the ATA6843/44, to enable a current monitoring tailored to the various types of power MOSFETs used in the application.

The new gate driver ICs ATA6843 and ATA6844 contain comprehensive protection and diagnostic functions, such as monitoring of over-temperature, over-voltage, under-voltage and short-circuit conditions, as well as charge-pump failures.

All incidents are communicated via three diagnostic outputs to the microcontroller to enable appropriate countermeasures.

A coast function allows simultaneous disabling of all six output stages in case of emergency.

The on-board integrated watchdog independently monitors the MCU to increase the overall system safety, eliminating an additional external component.

Dangerous short-circuit currents caused by faulty control signals are prevented from the pin-programmable timer stage that allows users to set a dead time for disabling unintended simultaneous activation of a high-side and a low-side power MOSFET within one branch.

Samples of the ATA6843 and ATA6844 are available now, both in QFN48 7 x 7mm packages.

Pricing starts at USD2.10 (ATA6843) for quantities of 10,000.

To simplify and speed up bench tests, pre-programmed ATA6843/44 design kits for sensorless or Hall sensor-type BLDC motors are also available.

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