# ATMEGA32L-8AU

**Microchip Tech** · ATMEL & AVR · TQFP-44(10x10)

ATMEGA32L-8AU from Microchip Tech, in a TQFP-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 | PB5 | bidirectional | Port B bit 5 8-bit bi-directional I/O with selectable internal pull-up, tri-stated on reset; alternate function MOSI (SPI). |
| 2 | PB6 | bidirectional | Port B bit 6 bi-directional I/O with selectable internal pull-up, tri-stated on reset; alternate function MISO (SPI). |
| 3 | PB7 | bidirectional | Port B bit 7 bi-directional I/O with selectable internal pull-up, tri-stated on reset; alternate function SCK (SPI). |
| 4 | RESET | input | Reset input; a low level longer than the minimum pulse length generates a reset even if the clock is not running. |
| 5 | VCC | power_in | Digital supply voltage (2.7V - 5.5V for ATmega32L). |
| 6 | GND | power_in | Ground. |
| 7 | XTAL2 | output | Output from the inverting oscillator amplifier. |
| 8 | XTAL1 | input | Input to the inverting oscillator amplifier and input to the internal clock operating circuit. |
| 9 | PD0 | bidirectional | Port D bit 0 bi-directional I/O with selectable internal pull-up, tri-stated on reset; alternate function RXD (USART). |
| 10 | PD1 | bidirectional | Port D bit 1 bi-directional I/O with selectable internal pull-up, tri-stated on reset; alternate function TXD (USART). |
| 11 | PD2 | bidirectional | Port D bit 2 bi-directional I/O with selectable internal pull-up, tri-stated on reset; alternate function INT0. |
| 12 | PD3 | bidirectional | Port D bit 3 bi-directional I/O with selectable internal pull-up, tri-stated on reset; alternate function INT1. |
| 13 | PD4 | bidirectional | Port D bit 4 bi-directional I/O with selectable internal pull-up, tri-stated on reset; alternate function OC1B. |
| 14 | PD5 | bidirectional | Port D bit 5 bi-directional I/O with selectable internal pull-up, tri-stated on reset; alternate function OC1A. |
| 15 | PD6 | bidirectional | Port D bit 6 bi-directional I/O with selectable internal pull-up, tri-stated on reset; alternate function ICP1. |
| 16 | PD7 | bidirectional | Port D bit 7 bi-directional I/O with selectable internal pull-up, tri-stated on reset; alternate function OC2. |
| 17 | VCC | power_in | Digital supply voltage (2.7V - 5.5V for ATmega32L). |
| 18 | GND | power_in | Ground. |
| 19 | PC0 | bidirectional | Port C bit 0 bi-directional I/O with selectable internal pull-up, tri-stated on reset; alternate function SCL (two-wire interface). |
| 20 | PC1 | bidirectional | Port C bit 1 bi-directional I/O with selectable internal pull-up, tri-stated on reset; alternate function SDA (two-wire interface). |
| 21 | PC2 | bidirectional | Port C bit 2 bi-directional I/O with selectable internal pull-up; alternate function TCK (JTAG), pull-up active even during reset if JTAG is enabled. |
| 22 | PC3 | bidirectional | Port C bit 3 bi-directional I/O with selectable internal pull-up; alternate function TMS (JTAG), pull-up active even during reset if JTAG is enabled. |
| 23 | PC4 | bidirectional | Port C bit 4 bi-directional I/O with selectable internal pull-up; alternate function TDO (JTAG), tri-stated unless TAP states that shift out data are entered. |
| 24 | PC5 | bidirectional | Port C bit 5 bi-directional I/O with selectable internal pull-up; alternate function TDI (JTAG), pull-up active even during reset if JTAG is enabled. |
| 25 | PC6 | bidirectional | Port C bit 6 bi-directional I/O with selectable internal pull-up, tri-stated on reset; alternate function TOSC1. |
| 26 | PC7 | bidirectional | Port C bit 7 bi-directional I/O with selectable internal pull-up, tri-stated on reset; alternate function TOSC2. |
| 27 | AVCC | power_in | Supply voltage for Port A and the A/D Converter; must be connected to VCC even if the ADC is not used, via a low-pass filter if the ADC is used. |
| 28 | GND | power_in | Ground. |
| 29 | AREF | input | Analog reference pin for the A/D Converter. |
| 30 | PA7 | bidirectional | Port A bit 7 bi-directional I/O with selectable internal pull-up, tri-stated on reset; ADC7 analog input. |
| 31 | PA6 | bidirectional | Port A bit 6 bi-directional I/O with selectable internal pull-up, tri-stated on reset; ADC6 analog input. |
| 32 | PA5 | bidirectional | Port A bit 5 bi-directional I/O with selectable internal pull-up, tri-stated on reset; ADC5 analog input. |
| 33 | PA4 | bidirectional | Port A bit 4 bi-directional I/O with selectable internal pull-up, tri-stated on reset; ADC4 analog input. |
| 34 | PA3 | bidirectional | Port A bit 3 bi-directional I/O with selectable internal pull-up, tri-stated on reset; ADC3 analog input. |
| 35 | PA2 | bidirectional | Port A bit 2 bi-directional I/O with selectable internal pull-up, tri-stated on reset; ADC2 analog input. |
| 36 | PA1 | bidirectional | Port A bit 1 bi-directional I/O with selectable internal pull-up, tri-stated on reset; ADC1 analog input. |
| 37 | PA0 | bidirectional | Port A bit 0 bi-directional I/O with selectable internal pull-up, tri-stated on reset; ADC0 analog input. |
| 38 | VCC | power_in | Digital supply voltage (2.7V - 5.5V for ATmega32L). |
| 39 | GND | power_in | Ground. |
| 40 | PB0 | bidirectional | Port B bit 0 bi-directional I/O with selectable internal pull-up, tri-stated on reset; alternate function XCK/T0. |
| 41 | PB1 | bidirectional | Port B bit 1 bi-directional I/O with selectable internal pull-up, tri-stated on reset; alternate function T1. |
| 42 | PB2 | bidirectional | Port B bit 2 bi-directional I/O with selectable internal pull-up, tri-stated on reset; alternate function AIN0/INT2. |
| 43 | PB3 | bidirectional | Port B bit 3 bi-directional I/O with selectable internal pull-up, tri-stated on reset; alternate function AIN1/OC0. |
| 44 | PB4 | bidirectional | Port B bit 4 bi-directional I/O with selectable internal pull-up, tri-stated on reset; alternate function SS (SPI). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | TQFP-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 |
|---|---|---|---|---|---|---|---|
| Supply voltage (ATmega32L, 8 MHz grade, ordering code ATmega32L-8AU) | VCC | 2.7 |  | 5.5 | V | ATmega32L-8AU, 8 MHz speed grade | 12 |
| Speed grade (ATmega32L) |  | 0 |  | 8 | MHz | ATmega32L | 1 |
| Operating temperature (Industrial range) |  | -40 |  | 85 | °C | Industrial operating range, ATmega32L-8AU | 12 |
| Power-down mode current |  |  |  | 1 | µA | Power-down Mode; listed under Power Consumption at 1 MHz, 3V, 25°C (printed as < 1µA) | 1 |

## CAD (KiCad official)

- Symbol: `ATMEGA32L-8AU`
- Footprint: `Package_QFP:TQFP-44_10x10mm_P0.8mm`
- 3D model: TQFP-44(10x10) (KiCad packages3D, STEP)
- 3D model files: `atmega32l-8au-etched.step` / `atmega32l-8au-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `atmega32l-8au.step` / `atmega32l-8au.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Microchip Tech datasheet](https://ww1.microchip.com/downloads/aemDocuments/documents/OTH/ProductDocuments/DataSheets/2503S.pdf) (21 pp, sha256 `6695cff15ac64d10`, retrieved 2026-10-30, tier: manufacturer)
- **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](docs/atmega32l-8au-datasheet.pdf)