# ATTINY3217-MN

**Microchip Tech** · Pre-ordered MCUs · HVQFN-24-EP(4x4)

ATTINY3217-MN from Microchip Tech, in a HVQFN-24-EP(4x4). 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 | PA2 | bidirectional | General-purpose I/O PA2 with EVOUT0, ADC AIN2, USART0 RxD (alternate position), SPI0 MISO, TWI0 SCL (alternate position) and LUT0-IN2 functions. |
| 2 | PA3/EXTCLK | bidirectional | General-purpose I/O PA3 that also serves as the external clock input EXTCLK, with ADC AIN3, USART0 XCK (alternate), SPI0 SCK, TCA0 WO3 and TCB1 WO functions. |
| 3 | GND | power_in | Ground. |
| 4 | VDD | power_in | Input supply voltage; device operating range is 1.8 V to 5.5 V. |
| 5 | PA4 | bidirectional | General-purpose I/O PA4 with ADC0 AIN4, ADC1 AIN0, PTC X0/Y0, USART0 XDIR (alternate), SPI0 SS, TCA0 WO4, TCD0 WOA and LUT0-OUT functions. |
| 6 | PA5 | bidirectional | General-purpose I/O PA5 with external reference input VREFA, ADC AIN5/AIN1, PTC X1/Y1, AC0 OUT, TCA0 WO5, TCB0 WO and TCD0 WOB functions. |
| 7 | PA6 | bidirectional | General-purpose I/O PA6 with ADC AIN6/AIN2, PTC X2/Y2, analog comparator inputs/output, and DAC0 analog output OUT. |
| 8 | PA7 | bidirectional | General-purpose I/O PA7 with ADC AIN7/AIN3, PTC X3/Y3, analog comparator inputs and LUT1-OUT functions. |
| 9 | PB7 | bidirectional | General-purpose I/O PB7 with ADC1 AIN4 and analog comparator inputs AINN1/AINP3. |
| 10 | PB6 | bidirectional | General-purpose I/O PB6 with ADC1 AIN5 and analog comparator inputs AINP3/AINN1. |
| 11 | PB5 | bidirectional | General-purpose I/O PB5 with CLKOUT, ADC1 AIN8, PTC X12/Y12, analog comparator inputs and TCA0 WO2 (alternate) functions. |
| 12 | PB4 | bidirectional | General-purpose I/O PB4 with ADC1 AIN9, PTC X13/Y13, analog comparator inputs, TCA0 WO1 (alternate) and LUT0-OUT (alternate) functions. |
| 13 | PB3 | bidirectional | General-purpose I/O PB3 that also serves as 32.768 kHz crystal oscillator pin TOSC1, with AC OUT, USART0 RxD and TCA0 WO0 (alternate) functions. |
| 14 | PB2/TOSC2 | bidirectional | General-purpose I/O PB2 that also serves as 32.768 kHz crystal oscillator pin TOSC2, with EVOUT1, AC OUT, USART0 TxD and TCA0 WO2 functions. |
| 15 | PB1 | bidirectional | General-purpose I/O PB1 with ADC1 AIN10, PTC X4/Y4, analog comparator input, USART0 XCK, TWI0 SDA and TCA0 WO1 functions. |
| 16 | PB0 | bidirectional | General-purpose I/O PB0 with ADC1 AIN11, PTC X5/Y5, analog comparator inputs, USART0 XDIR, TWI0 SCL and TCA0 WO0 functions. |
| 17 | PC0 | bidirectional | General-purpose I/O PC0 with ADC1 AIN6, PTC X6/Y6, SPI0 SCK (alternate), TCB0 WO (alternate) and TCD0 WOC functions. |
| 18 | PC1 | bidirectional | General-purpose I/O PC1 with ADC1 AIN7, PTC X7/Y7, SPI0 MISO (alternate), TCD0 WOD and LUT1-OUT (alternate) functions. |
| 19 | PC2 | bidirectional | General-purpose I/O PC2 with EVOUT2, ADC1 AIN8, PTC X8/Y8 and SPI0 MOSI (alternate) functions. |
| 20 | PC3 | bidirectional | General-purpose I/O PC3 with ADC1 AIN9, PTC X9/Y9, SPI0 SS (alternate), TCA0 WO3 (alternate) and LUT1-IN0 functions. |
| 21 | PC4 | bidirectional | General-purpose I/O PC4 with ADC1 AIN10, PTC X10/Y10, TCA0 WO4 (alternate), TCB1 WO (alternate) and LUT1-IN1 functions. |
| 22 | PC5 | bidirectional | General-purpose I/O PC5 with ADC1 AIN11, PTC X11/Y11, TCA0 WO5 (alternate) and LUT1-IN2 functions. |
| 23 | PA0/RESET/UPDI | bidirectional | General-purpose I/O PA0 that is also the RESET input and the single-pin UPDI programming/debug interface, selected by the RSTPINCFG fuse; also ADC0 AIN0 and LUT0-IN0. |
| 24 | PA1 | bidirectional | General-purpose I/O PA1 with ADC AIN1, USART0 TxD (alternate), SPI0 MOSI, TWI0 SDA (alternate) and LUT0-IN1 functions. |
| 25 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | HVQFN-24-EP(4x4) |
| Category | Embedded Processors & Controllers |
| Pins | 25 |

## 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 | VDD | 1.8 |  | 5.5 | V | ATtiny3217-MN ordering code | 565 |
| Operating temperature range |  | -40 |  | 105 | °C | N = -40°C to +105°C | 565 |
| Max. CPU speed |  |  |  | 20 | MHz | ATtiny3217-MN ordering code | 565 |
| TWI SCL low time, Standard mode | TLOW_Sm | 4700 |  |  | ns | specified minimum of the desired mode | 366 |
| TWI SCL low time, Fast mode | TLOW_Fm | 1300 |  |  | ns | specified minimum of the desired mode | 366 |
| TWI SCL low time, Fast mode Plus | TLOW_Fm+ | 500 |  |  | ns | specified minimum of the desired mode | 366 |
| Flash write/erase endurance |  |  | 10000 |  | cycles | Write/erase endurance | 1 |
| EEPROM write/erase endurance |  |  | 100000 |  | cycles | Write/erase endurance | 1 |
| Data retention |  |  | 40 |  | years | at 55°C | 1 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts |  | tin | including indium tin oxide (ITO) sensor grids. The PTC requires one pin per X-line and one pin per Y-line. In the Self Capacitance mode, the PTC requires only one pin (Y-line) for each touch sensor. | 460 |

## CAD (KiCad official)

- Symbol: `ATTINY3217-MN`
- Footprint: `Package_DFN_QFN:HVQFN-24-1EP_4x4mm_P0.5mm_EP2.1x2.1mm`
- 3D model: HVQFN-24-EP(4x4) (KiCad packages3D, STEP)
- 3D model files: `attiny3217-mn-etched.step` / `attiny3217-mn-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `attiny3217-mn.step` / `attiny3217-mn.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Microchip Tech datasheet](docs/attiny3217-mn-datasheet.pdf) (588 pp, sha256 `7a52087b237a6923`, retrieved 2026-10-27, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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/attiny3217-mn-datasheet.pdf)