Monday, December 17, 2012








The Atmel ATmega48/88/168 is a low-power CMOS 8-bit microcontroller based on the AVR enhanced RISC architecture. By executing powerful instructions in a single clock cycle, the ATmega48/88/168 achieves throughputs approaching 1 MIPS per MHz allowing the system designer to optimize power consumption versus processing speed.

The Atmel ATmega48/88/168 provides the following features: 4K/8K/16K bytes of In-System Programmable Flash with Read-While-Write capabilities, 256/512/512 bytes EEPROM, 512/1K/1K bytes SRAM, 23 general purpose I/O lines, 32 general purpose working registers, three flexible Timer/Counters with compare modes, internal and external interrupts, a serial programmable USART, a byte-oriented 2-wire Serial Interface, an SPI serial port, a 6-channel 10-bit ADC (8 channels in TQFP and QFN/MLF packages), a programmable Watchdog Timer with internal Oscillator, and five software selectable power saving modes. The Idle mode stops the CPU while allowing the SRAM, Timer/Counters, USART, 2-wire Serial Interface, SPI port, and interrupt system to continue functioning. The Power-down mode saves the register contents but freezes the Oscillator, disabling all other chip functions until the next interrupt or hardware reset. In Power-save mode, the asynchronous timer continues to run, allowing the user to maintain a timer base while the rest of the device is sleeping. The ADC Noise Reduction mode stops the CPU and all I/O modules except asynchronous timer and ADC, to minimize switching noise during ADC conversions. In Standby mode, the crystal/resonator Oscillator is running while the rest of the device is sleeping. This allows very fast start-up combined with low power consumption.

Features :

  • High performance, low power Atmel® AVR® 8-bit microcontroller
  • Advanced RISC architecture
    – 131 powerful instructions – most single clock cycle execution
    – 32 × 8 general purpose working registers
    – Fully static operation
    – Up to 20 MIPS throughput at 20MHz
    – On-chip 2-cycle multiplier
  • High endurance non-volatile memory segments
    – 4/8/16 Kbytes of in-system self-programmable flash program memory
    – 256/512/512 bytes EEPROM
    – 512/1K/1Kbytes internal SRAM
    – Write/erase cyles: 10,000 flash/100,000 EEPROM
    – Data retention: 20 years at 85°C/100 years at 25°C()
    – Optional boot code section with independent lock bits
          In-system programming by on-chip boot program
          True read-while-write operation
    – Programming lock for software security
  • QTouch® library support
    – Capacitive touch buttons, sliders and wheels
    – QTouch and QMatrix acquisition
    – Up to 64 sense channels
  • Peripheral features
    – Two 8-bit timer/counters with separate prescaler and compare mode
    – One 16-bit timer/counter with separate prescaler, compare mode, and capture mode
    – Real time counter with separate oscillator
    – Six PWM channels
    – 8-channel 10-bit ADC in TQFP and QFN/MLF package
    – 6-channel 10-bit ADC in PDIP Package
    – Programmable serial USART
    – Master/slave SPI serial interface
    – Byte-oriented 2-wire serial interface (Philips I2C compatible)
    – Programmable watchdog timer with separate on-chip oscillator
    – On-chip analog comparator
    – Interrupt and wake-up on pin change
  • Special microcontroller features
    – DebugWIRE on-chip debug system
    – Power-on reset and programmable brown-out detection
    – Internal calibrated oscillator
    – External and internal interrupt sources
    – Five sleep modes: Idle, ADC noise reduction, power-save, power-down, and standby
  • I/O and packages
    – 23 programmable I/O lines
    – 28-pin PDIP, 32-lead TQFP, 28-pad QFN/MLF and 32-pad QFN/MLF
  • Operating voltage:
    – 1.8V - 5.5V for Atmel ATmega48V/88V/168V
    – 2.7V - 5.5V for Atmel ATmega48/88/168
  • Temperature range:
    – -40°C to 85°C
  • Speed grade:
    – ATmega48V/88V/168V: 0 - 4MHz @ 1.8V - 5.5V, 0 - 10MHz @ 2.7V - 5.5V
    – ATmega48/88/168: 0 - 10MHz @ 2.7V - 5.5V, 0 - 20MHz @ 4.5V - 5.5V
  • Low power consumption
    – Active mode:
       250μA at 1MHz, 1.8V
       15μA at 32kHz, 1.8V (including oscillator)
    – Power-down mode:
       0.1μA at 1.8V 

Pinout Diagram

 Download Datasheet ATMEGA168

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