component
ATMEGA32U4-MU
Public Made by Adomby adom
Microchip Tech Microcontrollers (MCU/MPU/SOC), VQFN-44-EP(7x7). 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-MU
Microchip Tech · Microcontrollers (MCU/MPU/SOC) · VQFN-44-EP(7x7)
ATMEGA32U4-MU from Microchip Tech, in a VQFN-44-EP(7x7). 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 bi-directional I/O with internal pull-up; alternate functions INT.6 and AIN0 (analog comparator input). |
| 2 | UVCC | power_in | USB pads internal regulator input supply voltage. |
| 3 | D- | bidirectional | USB full/low speed negative data upstream port; connect to the USB D- connector pin with a serial 22 ohm resistor. |
| 4 | D+ | bidirectional | USB full/low speed positive data upstream port; connect to the USB D+ connector pin with a serial 22 ohm resistor. |
| 5 | UGND | power_in | USB pads ground. |
| 6 | UCAP | power_out | 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 bi-directional I/O with internal pull-up; alternate functions SS and PCINT0. |
| 9 | PB1 | bidirectional | Port B bit 1 bi-directional I/O with internal pull-up; alternate functions SCLK (SPI clock) and PCINT1. |
| 10 | PB2 | bidirectional | Port B bit 2 bi-directional I/O with internal pull-up; alternate functions MOSI, PDI and PCINT2. |
| 11 | PB3 | bidirectional | Port B bit 3 bi-directional I/O with internal pull-up; alternate functions MISO, PDO and PCINT3. |
| 12 | PB7 | bidirectional | Port B bit 7 bi-directional I/O with internal pull-up; alternate functions PCINT7, OC0A, OC1C and RTS. |
| 13 | RESET | input | Active-low 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 input to the internal clock operating circuit. |
| 18 | PD0 | bidirectional | Port D bit 0 bi-directional I/O with internal pull-up; alternate functions OC0B, SCL and INT0. |
| 19 | PD1 | bidirectional | Port D bit 1 bi-directional I/O with internal pull-up; alternate functions SDA and INT1. |
| 20 | PD2 | bidirectional | Port D bit 2 bi-directional I/O with internal pull-up; alternate functions RXD1 and INT2. |
| 21 | PD3 | bidirectional | Port D bit 3 bi-directional I/O with internal pull-up; alternate functions TXD1 and INT3. |
| 22 | PD5 | bidirectional | Port D bit 5 bi-directional I/O with internal pull-up; alternate functions XCK1 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 unused, or through a low-pass filter if used. |
| 25 | PD4 | bidirectional | Port D bit 4 bi-directional I/O with internal pull-up; alternate functions ICP1 and ADC8. |
| 26 | PD6 | bidirectional | Port D bit 6 bi-directional I/O with internal pull-up; alternate functions T1, OC4D (inverted) and ADC9. |
| 27 | PD7 | bidirectional | Port D bit 7 bi-directional I/O with internal pull-up; alternate functions T0, OC4D and ADC10. |
| 28 | PB4 | bidirectional | Port B bit 4 bi-directional I/O with internal pull-up; alternate functions PCINT4 and ADC11. |
| 29 | PB5 | bidirectional | Port B bit 5 bi-directional I/O with internal pull-up; alternate functions PCINT5, OC1A and OC4B (inverted), plus an ADC input. |
| 30 | PB6 | bidirectional | Port B bit 6 bi-directional I/O with internal pull-up; alternate functions PCINT6, OC1B and OC4B, plus an ADC input. |
| 31 | PC6 | bidirectional | Port C bit 6 bi-directional I/O with internal pull-up; alternate functions OC3A and OC4A (inverted). |
| 32 | PC7 | bidirectional | Port C bit 7 bi-directional I/O with internal pull-up; alternate functions ICP3, CLK0 and OC4A. |
| 33 | PE2 | bidirectional | Port E bit 2 bi-directional I/O with internal pull-up; alternate function HWB (active-low). |
| 34 | VCC | power_in | Digital supply voltage. |
| 35 | GND | power_in | Ground. |
| 36 | PF7 | bidirectional | Port F bit 7 ADC7 analog input or I/O; JTAG TDI, pull-up active when JTAG is enabled even during reset. |
| 37 | PF6 | bidirectional | Port F bit 6 ADC6 analog input or I/O; JTAG TDO. |
| 38 | PF5 | bidirectional | Port F bit 5 ADC5 analog input or I/O; JTAG TMS, pull-up active when JTAG is enabled even during reset. |
| 39 | PF4 | bidirectional | Port F bit 4 ADC4 analog input or I/O; JTAG TCK, pull-up active when JTAG is enabled even during reset. |
| 40 | PF1 | bidirectional | Port F bit 1 ADC1 analog input or I/O. |
| 41 | PF0 | bidirectional | Port F bit 0 ADC0 analog input or I/O. |
| 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 unused, or through a low-pass filter if used. |
| 45 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | VQFN-44-EP(7x7) |
| Category | Embedded Processors & Controllers |
| Pins | 45 |
CAD (KiCad official)
- Symbol:
ATMEGA32U4-MU - Footprint:
Package_DFN_QFN:QFN-44-1EP_7x7mm_P0.5mm_EP5.15x5.15mm - 3D model: VQFN-44-EP(7x7) (KiCad packages3D, STEP)
- 3D model files:
atmega32u4-mu-etched.step/atmega32u4-mu-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);atmega32u4-mu.step/atmega32u4-mu.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Microchip Tech datasheet (27 pp, sha256
65cd582b7eceee5f, retrieved 2026-10-09, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text+vision), consensusclaude-opus-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).