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Silicon Labs outs 8bit MCUs for motor control

Posted: 02 Aug 2013     Print Version  Bookmark and Share

Keywords:Silicon Labs  8bit MCU  motor control  C8051F85x/6x 

Silicon Labs has rolled out what it describes as a highly integrated, feature-rich 8bit MCUs optimised for cost-sensitive motor control applications. According to the company, the C8051F85x/6x MCUs combine best-in-class analogue and communications peripherals, flash sizes ranging from 2-8kB, high performance, small-footprint packaging and cost-effective pricing.

The devices are geared for brushless DC motor control applications used in remote-control helicopters and cars, PC and electric fans, electric tools and small appliances. The F85/6x MCUs are a good fit for other consumer and industrial applications such as power supplies, battery chargers, set-top boxes, projectors, lighting equipment and optical transceiver modules, indicated the firm. These AEC-Q100-qualified MCUs can also be used in automotive body electronics applications such as window lifts and power seats.

Designed to meet the performance requirements of motor control, the MCUs feature a high-speed 8051 core that is 50 per cent faster than the closest in-class competitors, Silicon Labs boasted. This high performance enables finer pulse-width modulation (PWM), enhanced motor control efficiency and the ability to execute more complex algorithms for a range of motor speeds. The F85x/6x MCUs also support three independent high-resolution PWM channels with a built-in over-current protection/fault detection capability specifically targeting motor control and power supply applications.

The MCUs take functional density to the next level by integrating advanced analogue and digital peripherals into a small package. The MCUs include a 12bit multi-channel ADC, two analogue comparators with programmable hysteresis and response time, and a precise internal voltage reference. The MCUs also feature an integrated precision 24.5MHz low-power oscillator and a low-frequency 80kHz oscillator, eliminating the need for an external clock or crystal. An on-chip temperature sensor simplifies system calibration without having to add a discrete sensor. Multiple communications peripherals (I2C, SPI and UART) also give developers the flexibility to choose their peripherals based on application requirements. This combination of on-chip features enables developers to minimise external components, resulting in lower system cost compared to competing MCUs, noted the firm.

Like all Silicon Labs 8bit MCUs, the F85x/6x family features a patented crossbar architecture that enables developers to customise peripherals and pinout placement based on their application needs and layout constraints without worrying about pin conflicts. This innovative crossbar architecture simplifies PCB routing, minimises PCB layers, and ultimately reduces design time and system cost through optimal use of pins.

Samples and production quantities of Silicon Labs' C8051F85x/6x MCUs are available in a 3 x 3mm 20-pin QFN package and also in 24-pin QSOP and 16-pin SOIC packages. Pricing for the F85x/6x MCUs in 10,000-unit quantities begins at Rs.21.74 ($0.40). The C8051F850-B-DK development kit and ToolStick850-B-SK starter kit are priced at Rs.3,478.26 ($64) and Rs.538.04 ($9.90) respectively.

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