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AVR MCUs have combines USB, battery charging and analog features
( 01 Jun 2008 )
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Atmel Corp. unveils its new AVR microcontrollers combining USB controller and high performance analog features. The ATmega16U4 and ATmega32U4 reduce system cost in battery powered devices, such as gaming accessories. The devices allow optimized battery charging combined with USB functions. The analog to digital converter (ADC) can be used to sense motion or pressure in the end application and the high-speed PWM is ideal for low cost motor control.
Gaming peripherals, such as sophisticated joysticks also require a number of analog to digital conversion channels and several PWM channels to drive force-feedback motors. The ATmega16U4 and ATmega32U4 have rich features set to address those needs and optimize the global system cost. These include a 10-bit ADC with 12 channels; a built-in temperature sensor allowing compensating thermal effects on analog performance; and a programmable gain x1, x10, x40 and x200, giving more flexibility to measure differential voltages for current monitoring. A high-speed timer with three PWM channels with complementary outputs and programmable dead-times allows 8-bit resolution PWM with an industry-best frequency of 500 kHz, up to 11-bit resolution PWM with a frequency over 60 kHz.
A hardware flow control on the USART eases the connection to other devices when bridging with USB at high baud rates. Digital inputs with TTL thresholds ease interface with 3V devices in mixed 5/3V applications. A On-chip 3.3V regulator can deliver up to 50mA and supply external devices in USB powered applications. Jitter and accuracy of the On-Chip 8 MHz calibrated RC oscillator can support serial communication without crystal. All devices include a hardware multiplier, one USART, one SPI, one TWI, two 8-bit and two 16-bit timers with PWM and 26 programmable I/Os.
ATmega16U4 features 16kB of In-System Programmable (ISP) Flash, 1kB of RAM and 512b of EEPROM. ATmega32U4 features 32kB of In-System Programmable (ISP) Flash, 2.5kB of RAM and 1kB of EEPROM. The devices are available in 44-pin packages.
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