# ATMEGA88-20AU

**Microchip Tech** · Pre-ordered MCUs · TQFP-32(7x7)

ATMEGA88-20AU from Microchip Tech, in a TQFP-32(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 | PD3 | bidirectional | Port D bit 3 is a bi-directional I/O pin with internal pull-up, multiplexed with INT1, PCINT19 and OC2B. |
| 2 | PD4 | bidirectional | Port D bit 4 is a bi-directional I/O pin with internal pull-up, multiplexed with PCINT20, T0 and XCK0. |
| 3 | GND | power_in | Ground. |
| 4 | VCC | power_in | Digital supply voltage. |
| 5 | GND | power_in | Ground. |
| 6 | VCC | power_in | Digital supply voltage. |
| 7 | PB6 | bidirectional | Port B bit 6 is a bi-directional I/O pin with internal pull-up, and can serve as input to the inverting oscillator amplifier (XTAL1/TOSC1) depending on clock fuse settings. |
| 8 | PB7 | bidirectional | Port B bit 7 is a bi-directional I/O pin with internal pull-up, and can serve as output from the inverting oscillator amplifier (XTAL2/TOSC2) depending on clock fuse settings. |
| 9 | PD5 | bidirectional | Port D bit 5 is a bi-directional I/O pin with internal pull-up, multiplexed with OC0B and T1. |
| 10 | PD6 | bidirectional | Port D bit 6 is a bi-directional I/O pin with internal pull-up, multiplexed with AIN0 and OC0A. |
| 11 | PD7 | bidirectional | Port D bit 7 is a bi-directional I/O pin with internal pull-up, multiplexed with AIN1. |
| 12 | PB0 | bidirectional | Port B bit 0 is a bi-directional I/O pin with internal pull-up, multiplexed with CLKO and ICP1. |
| 13 | PB1 | bidirectional | Port B bit 1 is a bi-directional I/O pin with internal pull-up, multiplexed with OC1A. |
| 14 | PB2 | bidirectional | Port B bit 2 is a bi-directional I/O pin with internal pull-up, multiplexed with OC1B and SS0. |
| 15 | PB3 | bidirectional | Port B bit 3 is a bi-directional I/O pin with internal pull-up, multiplexed with OC2A and MOSI0. |
| 16 | PB4 | bidirectional | Port B bit 4 is a bi-directional I/O pin with internal pull-up, multiplexed with MISO0. |
| 17 | PB5 | bidirectional | Port B bit 5 is a bi-directional I/O pin with internal pull-up, multiplexed with SCK0. |
| 18 | AVCC | power_in | Supply voltage pin for the A/D converter that should be connected to VCC even if the ADC is not used. |
| 19 | ADC6 | input | Analog input channel 6 of the 10-bit A/D converter, powered from the analog supply. |
| 20 | AREF | passive | Analog reference pin for the A/D converter. |
| 21 | GND | power_in | Ground. |
| 22 | ADC7 | input | Analog input channel 7 of the 10-bit A/D converter, powered from the analog supply. |
| 23 | PC0 | bidirectional | Port C bit 0 is a bi-directional I/O pin with internal pull-up, multiplexed with ADC0 and PCINT8. |
| 24 | PC1 | bidirectional | Port C bit 1 is a bi-directional I/O pin with internal pull-up, multiplexed with ADC1 and PCINT9. |
| 25 | PC2 | bidirectional | Port C bit 2 is a bi-directional I/O pin with internal pull-up, multiplexed with ADC2 and PCINT10. |
| 26 | PC3 | bidirectional | Port C bit 3 is a bi-directional I/O pin with internal pull-up, multiplexed with ADC3 and PCINT11. |
| 27 | PC4 | bidirectional | Port C bit 4 is a bi-directional I/O pin with internal pull-up, multiplexed with ADC4, SDA0 and PCINT12. |
| 28 | PC5 | bidirectional | Port C bit 5 is a bi-directional I/O pin with internal pull-up, multiplexed with ADC5, SCL0 and PCINT13. |
| 29 | PC6 | input | PC6 is the active-low Reset input when the RSTDISBL fuse is unprogrammed, and a general I/O pin otherwise, with a low level longer than the minimum pulse length generating a Reset. |
| 30 | PD0 | bidirectional | Port D bit 0 is a bi-directional I/O pin with internal pull-up, multiplexed with RXD0 and PCINT16. |
| 31 | PD1 | bidirectional | Port D bit 1 is a bi-directional I/O pin with internal pull-up, multiplexed with TXD0 and PCINT17. |
| 32 | PD2 | bidirectional | Port D bit 2 is a bi-directional I/O pin with internal pull-up, multiplexed with INT0 and PCINT18. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | TQFP-32(7x7) |
| Category | Embedded Processors & Controllers |
| Pins | 32 |

## 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 voltage (ATmega88, non-V) |  | 2.7 |  | 5.5 | V |  | 2 |
| Operating temperature range |  | -40 |  | 85 | °C |  | 2 |
| Speed grade at 4.5-5.5 V (ATmega88) |  | 0 |  | 20 | MHz | 4.5V - 5.5V | 2 |

## CAD (KiCad official)

- Symbol: `ATMEGA88-20AU`
- Footprint: `Package_QFP:TQFP-32_7x7mm_P0.8mm`
- 3D model: TQFP-32(7x7) (KiCad packages3D, STEP)
- 3D model files: `atmega88-20au-etched.step` / `atmega88-20au-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `atmega88-20au.step` / `atmega88-20au.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/en/DeviceDoc/Atmel-2545-8-bit-AVR-Microcontroller-ATmega48-88-168_Summary.pdf) (25 pp, sha256 `2391f8414ea893b9`, retrieved 2026-11-02, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-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).

[Datasheet PDF](docs/atmega88-20au-datasheet.pdf)