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Atmel has released the first in a range of 32-bit AVR microcontrollers (MCUs) targeted at motor control applications such as HVAC, power windows, power doors and power seats.

The UC3C AT32UC3C0512C AVR automotive-qualified microcontroller offers 512Kb of embedded flash memory.

The device features a pulse-width-modulation (PWM) controller and analogue functions on chip for direct motor control and automotive interface on chip (CAN, LIN) for in-car communication.

The new Atmel AVR UC3C range will also be available as true 5V devices up to 125C.

Atmel UC3C automotive-qualified MCUs offer all the necessary features required for tough motor control applications.

In sensor-less brushless DC motors (BLDCs), for instance, the UC3C range efficiently controls the motor by incorporating a fast four-channel PWM controller with a 20-bit precision, dead-time generation and fault protection; a 16-channel, 12-bit pipelined analogue-to-digital converter (ADC); a four-channel, 12-bit digital-to-analogue converter (DAC); an embedded temperature sensor; and four analogue comparators for back electromagnetic force (EMF) sensing.

Other features of the UC3C range include an independent peripheral event system coupled with DMA channels to allow inter-peripheral communication without central processing unit (CPU) intervention and to eliminate potential jitter.

This ensures a two-cycle latency between the completion of one peripheral operation and the start of another.

The range also includes powerful algorithms, such as field-oriented control (park and clack transformations), and includes an IEEE 754-1985-compatible floating-point unit (FPU), which increases the performance, precision and dynamic range of calculations, according to the company.

The use of the FPU is intended to enhance signal processing, filtering and noise suppression.

With a dual CAN interface, five LIN2.1-compliant independent universal synchronous/asynchronous receivers/transmitters (USARTs) and five I2C-compatible two-wire interfaces (TWIs), the UC3 range is equipped to communicate via standard in-car networks.

Holger Soehnle, product manager for embedded software at Vector Informatik, said: ‘We adapted our embedded software to support the UC3C.

‘Already available are two operating systems: the OSEK-conformant Oscan and the Autosar-conformant Microsar OS.

‘Furthermore, Canbedded communication software for CAN and LIN is available, as well as a Flash Bootloader, since this is required in most modern automotive applications,’ added Soehnle.

The UC3C range embeds a time-division-multiplexed inter-IC sound controller (I2S), an Ethernet MAC 10/100Mps interface and a USB 2.0 interface.

With embedded flash vault code protection – a flash security technology that allows the on-chip flash to be partially programmed and locked – the device offers a secure on-chip storage for secret code and software intellectual property.

These features also allow the device to carry valuable software from a trusted location to another location where the rest of the source code can be developed, debugged and programmed.

The new UC3C series has up to 512Kb embedded flash, with 10,000 write cycles and 15-year data retention.

It is possible to lock selected regions of the flash to secure the embedded software.

The UC3C also has up to 64Kb of embedded SRAM.

The devices are designed for 3.0-5.5V operation with a true 5V operation, qualified as automotive-grade-one products supporting a temperature range from -40C to +125C.

Samples of the AT32UC3C0512C UC3C device are now available in 144-pin LQFP, 100-pin QFP and 64-pin QFP and QFN packages.

Pricing starts at USD5.83 (GBP3.58) for quantities of 10,000.

To simplify and accelerate product design, the UC3C-EK evaluation kit, the STK600 starter kit and the AVR UC3C software framework are available.

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