ATMEGA32U4

Part: ATmega16U4/ATmega32U4 — Atmel Type: 8-bit Microcontroller with USB Controller Description: Low-power 8-bit AVR microcontroller with 16/32KB In-System Self-Programmable Flash, 1.25/2.5KB SRAM, 512Bytes/1KB EEPROM, and a USB 2.0 Full-speed/Low Speed Device Module.

Operating Conditions:

• Supply voltage: 2.7–5.5V
• Operating temperature: -40 to +85°C
• Max frequency: 16MHz at 4.5V

Absolute Maximum Ratings:

Key Specs:

• CPU: AVR 8-bit Microcontroller
• Throughput: Up to 16 MIPS at 16MHz
• Flash Memory: 16/32KB In-System Self-Programmable
• SRAM: 1.25/2.5KB Internal
• EEPROM: 512Bytes/1KB Internal
• Data Retention: 20 years at 85°C / 100 years at 25°C
• I/O Lines: 26 Programmable
• ADC: 12-channels, 10-bit with programmable gain
• USB Speed: Up to 12Mbit/s (Full-speed) and 1.5Mbit/s (Low Speed)

Features:

• Advanced RISC Architecture with 135 instructions
• On-chip 2-cycle Multiplier
• JTAG (IEEE std. 1149.1 compliant) Interface
• USB 2.0 Full-speed/Low Speed Device Module
• On-chip PLL for USB and High Speed Timer (32 up to 96MHz)
• Multiple Timer/Counters (8-bit, 16-bit, 10-bit High-Speed)
• Multiple PWM Channels (8-bit, 2 to 16 bits, 2 to 11 bits)
• Programmable Serial USART with Hardware Flow Control
• Master/Slave SPI Serial Interface
• Byte Oriented 2-wire Serial Interface
• Programmable Watchdog Timer
• On-chip Analog Comparator
• On-chip Temperature Sensor
• Six Sleep Modes

Applications:

• Embedded control applications (general purpose)

Package:

• 44-lead TQFP Package, 10x10mm
• 44-lead QFN Package, 7x7mm

• High Performance, Low Power AVR ® 8-Bit Microcontroller
• Advanced RISC Architecture
• 135 Powerful Instructions - Most Single Clock Cycle Execution
• 32 x 8 General Purpose Working Registers
• Fully Static Operation
• Up to 16 MIPS Throughput at 16MHz
• On-Chip 2-cycle Multiplier
• Non-volatile Program and Data Memories
• 16/32KB of In-System Self-Programmable Flash
• 1.25/2.5KB Internal SRAM
• 512Bytes/1KB Internal EEPROM
• Write/Erase Cycles: 10,000 Flash/100,000 EEPROM
• Data retention: 20 years at 85 C/ 100 years at 25 C (1)
• Optional Boot Code Section with Independent Lock Bits
• In-System Programming by On-chip Boot Program True Read-While-Write Operation Parts using external XTAL clock are pre-programed with a default USB bootloader
• Programming Lock for Software Security
• JTAG (IEEE ® std. 1149.1 compliant) Interface
• Boundary-scan Capabilities According to the JTAG Standard
• Extensive On-chip Debug Support
• Programming of Flash, EEPROM, Fuses, and Lock Bits through the JTAG Interface
• USB 2.0 Full-speed/Low Speed Device Module with Interrupt on Transfer Completion
• Complies fully with Universal Serial Bus Specification Rev 2.0
• Supports data transfer rates up to 12Mbit/s and 1.5Mbit/s
• Endpoint 0 for Control Transfers: up to 64-bytes
• Six Programmable Endpoints with IN or Out Directions and with Bulk, Interrupt or Isochronous Transfers
• Configurable Endpoints size up to 256 bytes in double bank mode
• Fully independent 832 bytes USB DPRAM for endpoint memory allocation
• Suspend/Resume Interrupts
• CPU Reset possible on USB Bus Reset detection
• 48MHz from PLL for Full-speed Bus Operation
• USB Bus Connection/Disconnection on Microcontroller Request
• Crystal-less operation for Low Speed mode
• Peripheral Features
• On-chip PLL for USB and High Speed Timer: 32 up to 96MHz operation
• One 8-bit Timer/Counter with Separate Prescaler and Compare Mode

Figure 1-1. Pinout