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20-pin flash MCUs include high-speed timers

Posted: 06 Nov 2006     Print Version  Bookmark and Share

Keywords:Atmel  tinyAVR  flash MCU  microcontrollers  MCUs 

TinyAVR flash MCUs from Atmel

Atmel Corp. has rolled out three 20-pin tinyAVR flash MCU devices with high-speed timers targeting battery chargers, sensor end-points and motor control applications.

The new devices are pin-compatible, differing only in the size of their flash, EEPROM and SRAM memories. ATtiny261 has 2Kbytes of self-programmable flash memory, whereas ATtiny461 and ATtiny861 have 4Kbytes and 8Kbytes, respectively. All devices deliver 20MIPS throughput when running at 20MHz.

"The ATtiny26 has been very successful and offered an unrivalled combination of processing power, analogue performance and high-speed timers. We have updated this device with the latest AVR features and increased processing speed while decreasing power consumption. The ATtiny261 operates down to 1.8V. It also has enhanced interface options and a unique on-chip temperature sensor," said Jukka Eskelinen, marketing director for tinyAVR products. "The ATtiny461 and ATtiny861 offer a migration path to customers who run out of code space with the ATtiny261," he added.

High-speed timer
The internal 8MHz RC oscillator and the on-chip PLL run the 10bit timer/counter at up to 64MHz. The high-speed timer/counter with three independent PWM generators and programmable dead times make the devices suitable for battery chargers, battery monitoring, power monitoring and motor-control applications.

All devices have internal EEPROM, pull-up resistors, an internal 8MHz precision oscillator and 12 general I/O pins for application use. Alternatively, the I/O pins work as ADC inputs or PWM outputs.

Commonly used MCU peripherals are all integrated. The ATtiny261/461/861 devices include a Universal Serial Interface (USI), which can be easily configured to work as an SPI, UART or TWI. Advanced analogue capabilities, such as built-in temperature measurement, a fast analogue comparator and a programmable analogue gain amplifier, allow highly integrated designs with a small price tag. A total of eleven 10bit ADC input channels allow a wide selection of peripherals to be connected in sensor and control applications, and the internal temperature sensor allows reliable system parameter calibration.

Low power consumption
Atmel said the ATtiny261/461/861 excels in battery-powered equipment due to inherently low power consumption and individually-selectable low-power sleep modes. A balance between system performance and power consumption is achieved by directly controlling the system clock frequency. Additional power saving is achieved by selectively turning off timers, the serial interface, and/or ADCs when not in use. As a result, the power consumption of the device in 1.8V active mode at 1MHz is less than 400µA and in power-down mode just a few microamps.

Complete evaluation and debug tools are available for the tinyAVR MCUs. The STK500 and STK505 starter kits are available at $79 each and offer all the necessary hardware to evaluate programs and test the capabilities of the ATtiny261, ATtiny461 and ATtiny861.

Samples of the ATtiny261, ATtiny461 and ATtiny861 are available in 20-pin SOIC and PDIP and 32-pad QFN packages. All three devices are in volume production. Volume prices for 10,000 units are Rs.36.97 (80 cents), Rs.41.59 (90 cents) and Rs.53.14 ($1.15), respectively.

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