ATMEGA32U4-AUR - 8-Bit AVR MCU, USB, 16MHz | Microchip
MPN: ATMEGA32U4-AUR ✓ AktifATMEGA32U4-AUR Ringkasan
A microcontroller unit (MCU) is a single-chip computer that integrates a processor core, memory, and peripherals such as timers, ADCs, and communication interfaces into one IC. Within the power-management and embedded-systems hierarchy, the ATmega32U4 belongs to the 8-bit AVR family (ATmega line -> AVR RISC architecture -> microcontroller -> semiconductor), where it is distinguished by native USB device support that eliminates the need for an external USB-serial bridge chip.
Key features include up to 16 MIPS throughput at 16 MHz, 131 mostly single-cycle AVR instructions, and 2.7 V to 5.5 V single-supply operation. The integrated USB 2.0 full-speed controller with on-chip transceiver makes the part a favorite for human-interface devices (HID): keyboards, mice, and game controllers that enumerate as native USB peripherals without external components.
Technical depth: the advanced RISC core provides 32 x 8-bit general-purpose working registers with fully static operation. The on-chip ADC offers 12 single-ended channels at 10-bit resolution, while JTAG enables boundary scan and on-chip debugging. Self-programming Flash supports bootloader-based field updates, and the AUR suffix denotes industrial temperature range and tape-and-reel packaging.
Typical applications include USB keyboards and mechanical keyboard controllers, Arduino Leonardo- and Micro-compatible boards, and battery-powered portable instruments where USB connectivity plus low power consumption matter.
Design consideration: if you do not want to commit to an external 16 MHz crystal, the ATMEGA32U4RC variant integrates a USB-calibrated internal oscillator at the cost of reduced clock precision.
This page synthesizes distributor pricing, drop-in alternatives, pinout data, and practical design notes not consolidated on the manufacturer product page.
Alternatif penggantian untuk ATMEGA32U4-AUR — paket yang sama, pin-pada-pin kompatibel. Bagian paket yang berbeda memerlukan kerja ulang PCB diabaikan.
Variasi di dalam seri ini
Model-series yang sama yang kompatibel dengan penggantian ATMEGA32U4-AUR (sama faktor bentuk dan footprint) — berbeda di dalam Package, Debug Interface, Operating Temperature, RoHS Status, Instruction Set.
ATMEGA32U4RC-AUR
✅ Drop-InKontak untuk harga
Lihat Datasheet →ATMEGA32U4-AU
✅ Drop-InKontak untuk harga
Lihat Datasheet →ATMEGA16U4-AU
✅ Drop-InKontak untuk harga
Lihat Datasheet →ATMEGA32U4-AUR Rating Maksimal & Karakteristik Listrik
| Core Architecture | 8-bit AVR RISC |
| Flash Program Memory | 32 KB (16K x 16), self-programming ISP |
| SRAM | 2.5 KB |
| EEPROM | 1 KB |
| Frekuensi Bawah Maximum | 16 MHz |
| Throughput | 16 MIPS at 16 MHz |
| Instructions | 131 powerful instructions, most single-cycle |
| USB Interface | USB 2.0 full-speed/low-speed device with on-chip transceiver |
| ADC | 12-channel, 10-bit |
| Debug Interface | JTAG for on-chip debug |
| Operating Voltage Range | 2.7 V to 5.5 V |
| Paket | 44-TQFP (10x10 mm) |
| Tipe Mounting | Surface Mount |
| Temperature Range | Industrial (-40C to +85C) |
| Status RoHS | Compliant (lead-free, green) |
| Packaging | Tape & Reel (R suffix) |
| Instruction Set | AVR |
Konfigurasi Pin ATMEGA32U4-AUR
| Pin produk 1 | PE6 — Port E bit 6 / INT.6 / AIN0 |
| Pin produk 2 | UVcc — USB pad power supply |
| Pin produk 3 | D- — USB negative data line |
| Pin produk 4 | D+ — USB positive data line |
| Pin produk 5 | UGND — USB pad ground |
| Pin produk 6 | UCap — USB regulator decoupling capacitor pin |
| Pin produk 7 | VBus — USB VBus sense input |
| Pin produk 8 | PB0 — Port B bit 0 / SS / PCINT0 |
| Pin produk 9 | PB1 — Port B bit 1 / SCLK / PCINT1 |
| Pin produk 10 | PB2 — Port B bit 2 / PDI / MOSI / PCINT2 |
| Pin produk 11 | PB3 — Port B bit 3 / PDO / MISO / PCINT3 |
| Pin produk 12 | PB7 — Port B bit 7 / OC0A / OC1C / RTS / PCINT7 |
| Pin produk 13 | RESET — Reset input (active low) |
| Pin produk 14 | VCC — Digital supply voltage |
| Pin produk 15 | GND — Ground |
| Pin produk 16 | XTAL2 — Crystal oscillator output |
| Pin produk 17 | XTAL1 — Crystal oscillator input / external clock |
| Pin produk 18 | PB4 — Port B bit 4 / ADC13 / PCINT4 |
| Pin produk 19 | PB5 — Port B bit 5 / ADC12 / OC1A / PCINT5 |
| Pin produk 20 | PB6 — Port B bit 6 / ADC11 / OC1B / PCINT6 |
| Pin produk 21 | PC6 — Port C bit 6 / OC3A / AIN1 |
| Pin produk 22 | PC7 — Port C bit 7 / ICP3 / CLK0 / OC4A |
| Pin produk 23 | PE2 — Port E bit 2 / HWB (hardware bootloader enable) |
| Pin produk 24 | PF7 — Port F bit 7 / ADC7 / TDI |
| Pin produk 25 | PF6 — Port F bit 6 / ADC6 / TDO |
| Pin produk 26 | PF5 — Port F bit 5 / ADC5 / TMS |
| Pin produk 27 | PF4 — Port F bit 4 / ADC4 / TCK |
| Pin produk 28 | PF1 — Port F bit 1 / ADC1 |
| Pin produk 29 | PF0 — Port F bit 0 / ADC0 |
| Pin produk 30 | AREF — Analog reference voltage |
| Pin produk 31 | GND — Ground |
| Pin produk 32 | AVCC — Analog supply voltage |
| Pin produk 33 | PC4 — Port C bit 4 / ADC8 / SDA / PCINT12 |
| Pin produk 34 | PC5 — Port C bit 5 / ADC9 / SCL / PCINT13 |
| Pin produk 35 | PD7 — Port D bit 7 / ADC10 / OC4D / T0 |
| Pin produk 36 | PD6 — Port D bit 6 / ADC9 (shared) / SCLK / INT6 |
| Pin produk 37 | PD5 — Port D bit 5 / XCK / RTS |
| Pin produk 38 | PD4 — Port D bit 4 / ADC8 (shared) / ICP1 |
| Pin produk 39 | PD3 — Port D bit 3 / INT3 / TXD1 / OC3B |
| Pin produk 40 | PD2 — Port D bit 2 / INT2 / RXD1 |
| Pin produk 41 | PD1 — Port D bit 1 / INT1 / SDA / OC2B |
| Pin produk 42 | PD0 — Port D bit 0 / INT0 / SCL / OC0B |
| Pin produk 43 | PE4 — Port E bit 4 / INT4 / ADC14 |
| Pin produk 44 | PE5 — Port E bit 5 / INT5 / ADC15 / OC3C |
Aplikasi Umum
ATMEGA32U4-AUR cocok untuk 6 aplikasis: USB Mechanical Keyboard Controllers, Arduino Leonardo / Micro Compatible Boards, USB Game Controllers and Joysticks, Portable and Battery-Powered Instruments, Industrial Control and HMI Nodes, HID Security Tokens and Authentication Devices.
USB Mechanical Keyboard Controllers
The ATMEGA32U4-AUR is the dominant controller for custom mechanical keyboards. Its integrated USB 2.0 full-speed device controller enumerates natively as an HID keyboard without an external USB-serial bridge, while 32 KB of self-programming Flash accommodates full QMK firmware layouts with layers, RGB lighting, and encoder support. The chip runs from USB bus power (5 V nominal, within the 2.7 V to 5.5 V range), and the 10-bit ADC supports battery-level monitoring in wireless variants. Bootloader support over USB (Caterina) enables end-user firmware updates without an external programmer, a decisive advantage over classic USB-bridge architectures like the ATmega328P plus CP2102 combination.
Direkomendasikan
Arduino Leonardo / Micro Compatible Boards
The ATmega32U4 powers the Arduino Leonardo, Micro, and Pro Micro product lines, so the bare ATMEGA32U4-AUR is the natural choice for derivative open-source boards. The 131-instruction AVR core executes at up to 16 MIPS, and the Arduino Leonardo board definition in the Arduino IDE supports the chip out of the box. Native USB enables Mouse and Keyboard library emulation, turning a sketch into a plug-and-play HID device. With 2.5 KB SRAM, sketches with moderate buffers and string tables fit comfortably, and the 1 KB EEPROM persists calibration data across power cycles without external nonvolatile memory.
Direkomendasikan
USB Game Controllers and Joysticks
Gamepad and joystick designs benefit directly from the ATMEGA32U4-AUR's combination of native USB HID enumeration and analog input capability. The 12-channel 10-bit ADC reads thumbsticks and trigger potentiometers with approximately 4.9 mV resolution at 5 V, enough for smooth 8-bit axis reporting, while up to 26 general-purpose I/O lines handle button matrices via scanning. The 16 MHz clock provides ample timing margin for 1 ms HID polling intervals. JTAG on-chip debug shortens firmware bring-up for force-feedback and combo-device (keyboard-plus-mouse-plus-joystick) composite descriptors.
Direkomendasikan
Portable and Battery-Powered Instruments
Handheld data loggers and meters use the ATMEGA32U4-AUR because it merges USB connectivity and low-power AVR operation in one 2.7 V to 5.5 V device, allowing a single lithium or AA-based supply without level shifting. The 10-bit ADC with 12 input channels samples sensor arrays, and the 1 KB EEPROM stores calibration constants on-board. In sleep modes the core current drops to the microamp range per the datasheet, extending battery life, while USB is only activated when plugged into a host for data upload. Self-programming Flash supports field firmware updates through the USB bootloader, eliminating recalls.
Direkomendasikan
Industrial Control and HMI Nodes
In industrial automation nodes, the ATMEGA32U4-AUR serves as a compact HMI and actuator controller. The industrial temperature rating of the AUR suffix (-40C to +85C) suits enclosure-mounted hardware, and JTAG debugging accelerates commissioning of motor-driver and relay-sequencing firmware. Multiple hardware timers support PWM outputs for dimmers and fan speed control, while USART/SPI/I2C peripherals link to sensor front-ends. The 32 KB Flash typically holds protocol stacks (Modbus RTU over UART) plus menu and display code with headroom for OTA-style updates via the USB bootloader during maintenance windows.
Direkomendasikan
HID Security Tokens and Authentication Devices
USB security keys and authentication tokens built on the ATMEGA32U4-AUR benefit from native USB HID class support (no custom drivers on the host) and the self-programming Flash used to manage challenge-response firmware and key slots. The 1 KB EEPROM stores configuration and non-secret metadata, while the AVR core executes HMAC routines at adequate speed for one-touch login devices. The 44-TQFP package fits within the standard keyfob PCB outline, and bus-powered operation from the USB port removes battery considerations entirely from the industrial design.
Direkomendasikan
Ringkasan Produk Direkomendasikan
Data referensi engineering untuk ATMEGA32U4-AUR — pembandingan, panduan desain, dan informasi konformitas.
Panduan Pemilihan
Pembandingan dengan Alternatif
| Parameter Umum | Produk Ini | ATMEGA32U4RC-AUR | ATMEGA32U4-AU | ATMEGA16U4-AU |
|---|---|---|---|---|
| Package | 44-TQFP (10x10) | 44-TQFP (10x10) - same | 44-TQFP (10x10) - same | 44-TQFP (10x10) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 32 KB | 32 KB | 32 KB | 16 KB |
| USB Controller | USB 2.0 full-speed/low-speed device | USB 2.0 full-speed/low-speed device | USB 2.0 full-speed/low-speed device | USB 2.0 full-speed/low-speed device |
| Clock Source for USB | External 16 MHz crystal required | Integrated USB-calibrated internal oscillator | External 16 MHz crystal required | External crystal required |
| Maximum Clock Frequency | 16 MHz | 16 MHz | 16 MHz | 16 MHz |
| Operating Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| ADC | 12-channel, 10-bit | 12-channel, 10-bit | 12-channel, 10-bit | 12-channel, 10-bit |
| JTAG Debug | Yes | Yes | Yes | Yes |
Diferensiator Kunci
- Full 32 KB Flash for feature-rich USB firmware (vsATMEGA16U4-AU)
- Native USB 2.0 full-speed device controller (vsATMEGA328PB-AUR)
- Crystal-free option within the same family (vsATMEGA32U4RC-AUR)
Catatan Desain
Place the 1 uF UCAP capacitor (pin 6) as close to the UCAP/UGND pins as possible, using a short, direct trace to ground; this integrates the internal USB 3.3 V regulator and instability here is the most common cause of USB enumeration failure on ATmega32U4 boards. Route the D+/D- pair (pins 4/3) as a 90-ohm differential pair with length matching. Provide a separate UGND connection to the USB connector shell per the Microchip datasheet USB hardware design guidelines.
Decouple VCC (pin 14), AVCC (pin 32), and UVcc (pin 2) independently with 100 nF capacitors, plus bulk 4.7-10 uF near the USB connector. Connect AVCC to VCC through an LC filter or ferrite bead when the ADC is used with precision analog front-ends, keeping ADC noise low at the 10-bit level. Ensure the VBus sense divider on pin 7 correctly reports bus presence, since the firmware typically gates USB attach on VBus detection per USB specification self-power rules.
PE2/HWB (pin 23) must be held low during reset for the chip to boot from Flash rather than entering the hardware bootloader, unless bootloader entry is intended; a pull-down resistor is standard practice. If firmware bricks the USB interface, recovery requires ISP programming through PB1/PB2/PB3 (SCLK/MOSI/MISO), so expose ISP pads on the PCB. When using the RC variant as a substitute, remember its fuse settings differ (clock source fuses), and stock-programmed parts may need fuse updates before flashing production firmware.
Keep the 16 MHz crystal and its 18-22 pF load capacitors within a few millimeters of XTAL1/XTAL2 (pins 17/16) with a solid ground guard trace. Estimated: crystal accuracy directly determines USB clock tolerance via the on-chip PLL, so a 20 ppm crystal is recommended; a marginal crystal can pass UART tests yet fail USB full-speed eye requirements. Avoid routing USB or high-current LED matrix lines under the crystal area.
Informasi Konformitas
FindIC lists the part as Green (RoHS-compliant, lead-free) in TQFP package. Not an automotive AEC-Q100 part. REACH and conflict-minerals status not stated in the provided data.