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ATMEGA32U2-MUR

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Microchip Tech Pre-ordered MCUs, VQFN-32-EP(5x5). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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ATMEGA32U2-MUR

Microchip Tech · Pre-ordered MCUs · VQFN-32-EP(5x5)

ATMEGA32U2-MUR from Microchip Tech, in a VQFN-32-EP(5x5). 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 XTAL1 input Input to the inverting oscillator amplifier and input to the internal clock operating circuit.
2 XTAL2/PC0 bidirectional Output from the inverting oscillator amplifier if enabled by fuse; also serves as a generic I/O (PC0).
3 GND power_in Ground.
4 VCC power_in Digital supply voltage.
5 PC2 bidirectional Port C bit 2 with internal pull-up; alternate functions PCINT11 and AIN2.
6 PD0 bidirectional Port D bit 0 with internal pull-up; alternate functions OC.0B and INT0.
7 PD1 bidirectional Port D bit 1 with internal pull-up; alternate functions AIN0 and INT1.
8 PD2 bidirectional Port D bit 2 with internal pull-up; alternate functions RXD1, AIN1 and INT2.
9 PD3 bidirectional Port D bit 3 with internal pull-up; alternate functions TXD1 and INT3.
10 PD4 bidirectional Port D bit 4 with internal pull-up; alternate functions INT5 and AIN3.
11 PD5 bidirectional Port D bit 5 with internal pull-up; alternate functions XCK, AIN4 and PCINT12.
12 PD6 bidirectional Port D bit 6 with internal pull-up; alternate functions RTS, AIN5 and INT6.
13 PD7 bidirectional Port D bit 7 with internal pull-up; alternate functions CTS, HWB, AIN6, T0 and INT7.
14 PB0 bidirectional Port B bit 0 with internal pull-up; alternate functions SS and PCINT0.
15 PB1 bidirectional Port B bit 1 with internal pull-up; alternate functions SCLK and PCINT1.
16 PB2 bidirectional Port B bit 2 with internal pull-up; alternate functions PDI, MOSI and PCINT2.
17 PB3 bidirectional Port B bit 3 with internal pull-up; alternate functions PDO, MISO and PCINT3.
18 PB4 bidirectional Port B bit 4 with internal pull-up; alternate functions T1 and PCINT4.
19 PB5 bidirectional Port B bit 5 with internal pull-up; alternate function PCINT5.
20 PB6 bidirectional Port B bit 6 with internal pull-up; alternate function PCINT6.
21 PB7 bidirectional Port B bit 7 with internal pull-up; alternate functions PCINT7, OC.0A and OC.1C.
22 PC7 bidirectional Port C bit 7 with internal pull-up; alternate functions INT4, ICP1 and CLKO.
23 PC6 bidirectional Port C bit 6 with internal pull-up; alternate functions OC.1A and PCINT8.
24 RESET/PC1/dW input Reset input, active low for longer than the minimum pulse length; alternatively debugWIRE channel or generic I/O depending on fuses RSTDISBL and DWEN.
25 PC5 bidirectional Port C bit 5 with internal pull-up; alternate functions PCINT9 and OC.1B.
26 PC4 bidirectional Port C bit 4 with internal pull-up; alternate function PCINT10.
27 UCAP passive USB pads internal regulator output supply voltage; connect an external 1 uF capacitor.
28 UGND power_in USB ground.
29 D+ bidirectional USB full speed positive data upstream port.
30 D- bidirectional USB full speed negative data upstream port.
31 UVCC power_in USB pads internal regulator input supply voltage.
32 AVCC power_in Supply voltage for all analog features (analog comparator, PLL); should be externally connected to VCC through a low-pass filter.
33 EP power_in Large center pad underneath the QFN package; should be soldered to ground on the board for mechanical stability.

Key specifications

Parameter Value
Manufacturer Microchip Tech
Package VQFN-32-EP(5x5)
Category Embedded Processors & Controllers
Pins 33

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Operating supply voltage 2.7 5.5 V Operating Voltages 1
Operating temperature (Industrial) -40 85 °C Industrial 1
Maximum frequency at 2.7V 8 MHz 8 MHz at 2.7V - Industrial range 1
Maximum frequency at 4.5V 16 MHz 16 MHz at 4.5V - Industrial range 1

CAD (KiCad official)

  • Symbol: ATMEGA32U2-MUR
  • Footprint: Package_DFN_QFN:QFN-32-1EP_5x5mm_P0.5mm_EP3.3x3.3mm
  • 3D model: VQFN-32-EP(5x5) (KiCad packages3D, STEP)
  • 3D model files: atmega32u2-mur-etched.step / atmega32u2-mur-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); atmega32u2-mur.step / atmega32u2-mur.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Microchip Tech datasheet (22 pp, sha256 78639455b8b6b4e8, retrieved 2026-10-23, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text+vision), consensus claude-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).

Datasheet PDF