component
ATMEGA32U4-AU
Public Made by Adomby adom
Microchip Tech Microcontrollers (MCU/MPU/SOC), QFP-44(10x10). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownATMEGA32U4-AU
Microchip Tech · Microcontrollers (MCU/MPU/SOC) · QFP-44(10x10)
ATMEGA32U4-AU from Microchip Tech, in a QFP-44(10x10). Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | PE6 | bidirectional | Port E bit 6 I/O with internal pull-up; alternate functions INT.6 and AIN0 (analog comparator positive input). |
| 2 | UVCC | power_in | USB pads internal regulator input supply voltage. |
| 3 | D- | bidirectional | USB full/low speed negative data line, connect to USB D- connector pin through a serial 22 Ohm resistor. |
| 4 | D+ | bidirectional | USB full/low speed positive data line, connect to USB D+ connector pin through a serial 22 Ohm resistor. |
| 5 | UGND | power_in | USB pads ground. |
| 6 | UCAP | passive | USB pads internal regulator output supply voltage, connect to an external 1 uF capacitor. |
| 7 | VBUS | power_in | USB VBUS monitor input. |
| 8 | PB0 | bidirectional | Port B bit 0 I/O with internal pull-up; alternate functions SS (SPI slave select) and PCINT0. |
| 9 | PB1 | bidirectional | Port B bit 1 I/O with internal pull-up; alternate functions SCK (SPI clock) and PCINT1. |
| 10 | PB2 | bidirectional | Port B bit 2 I/O with internal pull-up; alternate functions PDI, MOSI and PCINT2. |
| 11 | PB3 | bidirectional | Port B bit 3 I/O with internal pull-up; alternate functions PDO, MISO and PCINT3. |
| 12 | PB7 | bidirectional | Port B bit 7 I/O with internal pull-up; alternate functions PCINT7, OC0A, OC1C and RTS. |
| 13 | RESET | input | Reset input; a low level longer than the minimum pulse length generates a reset even if the clock is not running. |
| 14 | VCC | power_in | Digital supply voltage. |
| 15 | GND | power_in | Ground. |
| 16 | XTAL2 | output | Output from the inverting oscillator amplifier. |
| 17 | XTAL1 | input | Input to the inverting oscillator amplifier and to the internal clock operating circuit. |
| 18 | PD0 | bidirectional | Port D bit 0 I/O with internal pull-up; alternate functions OC0B, SCL (TWI clock) and INT0. |
| 19 | PD1 | bidirectional | Port D bit 1 I/O with internal pull-up; alternate functions SDA (TWI data) and INT1. |
| 20 | PD2 | bidirectional | Port D bit 2 I/O with internal pull-up; alternate functions RXD1 (USART1 receive) and INT2. |
| 21 | PD3 | bidirectional | Port D bit 3 I/O with internal pull-up; alternate functions TXD1 (USART1 transmit) and INT3. |
| 22 | PD5 | bidirectional | Port D bit 5 I/O with internal pull-up; alternate functions XCK1 (USART1 external clock) and CTS. |
| 23 | GND | power_in | Ground. |
| 24 | AVCC | power_in | Supply voltage for the A/D converter channels; connect to VCC if the ADC is not used, otherwise to VCC through a low-pass filter. |
| 25 | PD4 | bidirectional | Port D bit 4 I/O with internal pull-up; alternate functions ICP1 and ADC8. |
| 26 | PD6 | bidirectional | Port D bit 6 I/O with internal pull-up; alternate functions T1, OC4D (complementary) and ADC9. |
| 27 | PD7 | bidirectional | Port D bit 7 I/O with internal pull-up; alternate functions T0, OC4D and ADC10. |
| 28 | PB4 | bidirectional | Port B bit 4 I/O with internal pull-up; alternate functions PCINT4 and ADC11. |
| 29 | PB5 | bidirectional | Port B bit 5 I/O with internal pull-up; alternate functions PCINT5, OC1A, OC4B (complementary) and ADC12. |
| 30 | PB6 | bidirectional | Port B bit 6 I/O with internal pull-up; alternate functions PCINT6, OC1B, OC4B and ADC13. |
| 31 | PC6 | bidirectional | Port C bit 6 I/O with internal pull-up; alternate functions OC3A and OC4A (complementary). |
| 32 | PC7 | bidirectional | Port C bit 7 I/O with internal pull-up; alternate functions ICP3, CLKO and OC4A. |
| 33 | PE2 | bidirectional | Port E bit 2 I/O with internal pull-up; alternate function HWB. |
| 34 | VCC | power_in | Digital supply voltage. |
| 35 | GND | power_in | Ground. |
| 36 | PF7 | bidirectional | Port F bit 7 I/O or ADC7 analog input; JTAG TDI, with pull-up active even during reset when JTAG is enabled. |
| 37 | PF6 | bidirectional | Port F bit 6 I/O or ADC6 analog input; JTAG TDO. |
| 38 | PF5 | bidirectional | Port F bit 5 I/O or ADC5 analog input; JTAG TMS, with pull-up active even during reset when JTAG is enabled. |
| 39 | PF4 | bidirectional | Port F bit 4 I/O or ADC4 analog input; JTAG TCK, with pull-up active even during reset when JTAG is enabled. |
| 40 | PF1 | bidirectional | Port F bit 1 I/O or ADC1 analog input. |
| 41 | PF0 | bidirectional | Port F bit 0 I/O or ADC0 analog input. |
| 42 | AREF | input | Analog reference input for the A/D converter. |
| 43 | GND | power_in | Ground. |
| 44 | AVCC | power_in | Supply voltage for the A/D converter channels; connect to VCC if the ADC is not used, otherwise to VCC through a low-pass filter. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | QFP-44(10x10) |
| Category | Embedded Processors & Controllers |
| Pins | 44 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Input Low Voltage, except XTAL1 and RESET pins (LVTTL) | VIL | -0.5 | V | VCC = 2.7V - 5.5V | 378 | ||
| Input Low Voltage, XTAL1 pin | VIL1 | -0.5 | V | VCC = 2.7V - 5.5V | 378 | ||
| Input Low Voltage, RESET pin | VIL2 | -0.5 | V | VCC = 2.7V - 5.5V | 378 | ||
| Output Low Voltage | VOL | 0.7 | V | IOL = 10mA, VCC = 5V | 378 | ||
| Output Low Voltage | VOL | 0.5 | V | IOL = 5mA, VCC = 3V | 378 | ||
| Output High Voltage | VOH | 4.2 | V | IOH = -10mA, VCC = 5V | 378 | ||
| Output High Voltage | VOH | 2.3 | V | IOH = -5mA, VCC = 3V | 378 | ||
| Input Leakage Current I/O Pin (absolute value) | IIL | 1 | µA | VCC = 5.5V, pin low | 378 | ||
| Reset Pull-up Resistor | RRST | 30 | 60 | kΩ | 378 | ||
| I/O Pin Pull-up Resistor | RPU | 20 | 50 | kΩ | 378 | ||
| Power Supply Current, Active 4MHz | ICC | 5 | mA | VCC = 3V (ATmega16U4/ATmega32U4) | 379 | ||
| Power Supply Current, Active 8MHz | ICC | 10 | 15 | mA | VCC = 5V (ATmega16U4/ATmega32U4) | 379 | |
| Power Supply Current, Idle 4MHz | ICC | 2 | mA | VCC = 3V (ATmega16U4/ATmega32U4) | 379 | ||
| Power Supply Current, Idle 8MHz | ICC | 6 | mA | VCC = 5V (ATmega16U4/ATmega32U4) | 379 | ||
| Power Supply Current, Power-down mode, WDT enabled | ICC | 12 | µA | VCC = 3V, Regulator Disabled | 379 | ||
| Power Supply Current, Power-down mode, WDT disabled | ICC | 1 | 5 | µA | VCC = 3V, Regulator Disabled | 379 | |
| Analog Comparator Input Offset Voltage | VACIO | 40 | mV | VCC = 5V, Vin = VCC/2 | 379 | ||
| Analog Comparator Input Leakage Current | IACLK | -50 | 50 | nA | VCC = 5V, Vin = VCC/2 | 379 | |
| Analog Comparator Propagation Delay | tACID | 750 | ns | VCC = 2.7V | 379 | ||
| Analog Comparator Propagation Delay | tACID | 500 | ns | VCC = 4.0V | 379 | ||
| Oscillator Frequency | 1/tCLCL | 0 | 8 | MHz | VCC = 2.7-5.5V (External Clock Drive) | 380 | |
| Oscillator Frequency | 1/tCLCL | 0 | 16 | MHz | VCC = 4.5-5.5V (External Clock Drive) | 380 | |
| USB Series resistor (external) tolerance | Rusb | -5 | 5 | % | 22Ω ±5% | 380 | |
| UCAP external capacitor | CUCAP | 1 | µF | USB pads internal regulator output capacitor | 380 | ||
| UCAP external capacitor tolerance | CUCAP | -20 | 20 | % | 1µF ±20% | 380 | |
| Brown-out Reset threshold VBOT (BODLEVEL 110) | VBOT | 1.8 | 2 | 2.2 | V | BODLEVEL[2..0] = 110 | 52 |
| Brown-out Reset threshold VBOT (BODLEVEL 101) | VBOT | 2 | 2.2 | 2.4 | V | BODLEVEL[2..0] = 101 | 52 |
| Brown-out Reset threshold VBOT (BODLEVEL 100) | VBOT | 2.2 | 2.4 | 2.6 | V | BODLEVEL[2..0] = 100 | 52 |
| Brown-out Reset threshold VBOT (BODLEVEL 011) | VBOT | 2.4 | 2.6 | 2.8 | V | BODLEVEL[2..0] = 011 | 52 |
| Brown-out Reset threshold VBOT (BODLEVEL 010) | VBOT | 3.2 | 3.4 | 3.6 | V | BODLEVEL[2..0] = 010 | 52 |
| Brown-out Reset threshold VBOT (BODLEVEL 001) | VBOT | 3.3 | 3.5 | 3.7 | V | BODLEVEL[2..0] = 001 | 52 |
| Brown-out Reset threshold VBOT (BODLEVEL 000) | VBOT | 4 | 4.3 | 4.5 | V | BODLEVEL[2..0] = 000 | 52 |
| Voltage on RESET with respect to Ground | -0.5 | 13 | V | 378 | |||
| Voltage on any pin except RESET and VBUS with respect to Ground | -0.5 | V | Upper limit printed as VCC+0.5V | 378 | |||
| Voltage on VBUS with respect to Ground | -0.5 | 6 | V | 378 | |||
| Maximum Operating Voltage | 6 | V | 378 | ||||
| DC Current per I/O Pin | 40 | mA | 378 | ||||
| DC Current VCC and GND Pins | 200 | mA | 378 | ||||
| Storage Temperature | -65 | 150 | °C | 378 | |||
| Operating Temperature | -40 | 85 | °C | 378 | |||
| Supply Voltage | VCC | 2.7 | 5.5 | V | TA = -40°C to 85°C | 378 |
CAD (KiCad official)
- Symbol:
ATMEGA32U4-AU - Footprint:
Package_QFP:TQFP-44_10x10mm_P0.8mm - 3D model: QFP-44(10x10) (KiCad packages3D, STEP)
- 3D model files:
atmega32u4-au-etched.step/atmega32u4-au-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);atmega32u4-au.step/atmega32u4-au.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Microchip Tech datasheet (433 pp, sha256
f597eb86aaa7df12, retrieved 2026-10-18, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-sonnet-5-5(agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish. - CAD: KiCad official libraries (CC-BY-SA 4.0).