The ATtiny261/461/861 Flash microcontroller devices from Atmel feature high-speed timers targeting battery chargers, sensor end-points, and motor control applications. The devices are pin-compatible, differing only in the size of their Flash, EEPROM and SRAM memories. The ATtiny261 has 2 Kbytes of self-programmable Flash memory, whereas the ATtiny461 and ATtiny861 have 4 Kbytes and 8 Kbytes, respectively. All devices deliver 20 MIPS throughput when running at 20 MHz.
The internal 8 MHz RC oscillator and the on-chip PLL run the 10-bit timer/counter at up to 64 MHz. The high-speed timer/counter with three independent PWM generators and programmable dead times make the devices ideal for battery chargers, battery monitoring, power monitoring and motor-control applications.
All devices have internal EEPROM, pull-up resistors, an internal 8 MHz precision oscillator and 12 general I/O pins for application use. Alternatively, the I/O pins work as ADC inputs or PWM (Pulse Width Modulation) outputs.
Commonly used microcontroller 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 analog capabilities, such as built-in temperature measurement, a fast analog comparator and a programmable analog gain amplifier, allow highly-integrated designs with a small price tag. A total of eleven 10-bit A/D converter 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.
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 1 MHz is less than 400 uA and in power-down mode just a few uA.