# ATTINY1617-MFR

**Microchip Tech** · Microcontroller Units (MCUs/MPUs/SOCs) · VQFN-24-EP(4x4)

ATTINY1617-MFR from Microchip Tech, in a VQFN-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 | PORTA pin 2 GPIO with EVOUT0, ADC0 AIN2, USART0 RxD (alternate), SPI0 MISO, TWI0 SCL (alternate) and CCL LUT0-IN2 functions. |
| 2 | PA3/EXTCLK | bidirectional | PORTA pin 3 GPIO that also serves as the EXTCLK external clock input, ADC0 AIN3, USART0 XCK (alternate), SPI0 SCK, TCA0 WO3 and TCB1 WO. |
| 3 | GND | power_in | Ground. |
| 4 | VDD | power_in | Input supply voltage; operating range is 1.8 V to 5.5 V. |
| 5 | PA4 | bidirectional | PORTA pin 4 GPIO with ADC0 AIN4, ADC1 AIN0, PTC X0/Y0, USART0 XDIR (alternate), SPI0 SS, TCA0 WO4, TCD0 WOA and CCL LUT0-OUT functions. |
| 6 | PA5 | bidirectional | PORTA pin 5 GPIO with VREFA external reference input, ADC0 AIN5, ADC1 AIN1, PTC X1/Y1, AC0 OUT, TCA0 WO5, TCB0 WO and TCD0 WOB functions. |
| 7 | PA6 | bidirectional | PORTA pin 6 GPIO with ADC0 AIN6, ADC1 AIN2, PTC X2/Y2, analog comparator inputs and DAC0 OUT functions. |
| 8 | PA7 | bidirectional | PORTA pin 7 GPIO with ADC0 AIN7, ADC1 AIN3, PTC X3/Y3, analog comparator inputs and CCL LUT1-OUT functions. |
| 9 | PB7 | bidirectional | PORTB pin 7 GPIO with ADC1 AIN4 and analog comparator inputs (AINN1, AINP3). |
| 10 | PB6 | bidirectional | PORTB pin 6 GPIO with ADC1 AIN5 and analog comparator inputs (AINP3, AINN1). |
| 11 | PB5 | bidirectional | PORTB pin 5 GPIO with CLKOUT, ADC0 AIN8, PTC X12/Y12, analog comparator inputs and TCA0 WO2 (alternate) functions. |
| 12 | PB4 | bidirectional | PORTB pin 4 GPIO with ADC0 AIN9, PTC X13/Y13, analog comparator inputs, TCA0 WO1 (alternate) and CCL LUT0-OUT (alternate) functions. |
| 13 | PB3 | bidirectional | PORTB pin 3 GPIO that also serves as the TOSC1 32.768 kHz crystal pin, with USART0 RxD and TCA0 WO0 (alternate) functions. |
| 14 | PB2/TOSC2 | bidirectional | PORTB pin 2 GPIO that also serves as the TOSC2 32.768 kHz crystal pin, with EVOUT1, USART0 TxD and TCA0 WO2 functions. |
| 15 | PB1 | bidirectional | PORTB pin 1 GPIO with ADC0 AIN10, PTC X4/Y4, analog comparator input, USART0 XCK, TWI0 SDA and TCA0 WO1 functions. |
| 16 | PB0 | bidirectional | PORTB pin 0 GPIO with ADC0 AIN11, PTC X5/Y5, analog comparator inputs, USART0 XDIR, TWI0 SCL and TCA0 WO0 functions. |
| 17 | PC0 | bidirectional | PORTC pin 0 GPIO with ADC1 AIN6, PTC X6/Y6, SPI0 SCK (alternate), TCB0 WO (alternate) and TCD0 WOC functions. |
| 18 | PC1 | bidirectional | PORTC pin 1 GPIO with ADC1 AIN7, PTC X7/Y7, SPI0 MISO (alternate), TCD0 WOD and CCL LUT1-OUT (alternate) functions. |
| 19 | PC2 | bidirectional | PORTC pin 2 GPIO with EVOUT2, ADC1 AIN8, PTC X8/Y8 and SPI0 MOSI (alternate) functions. |
| 20 | PC3 | bidirectional | PORTC pin 3 GPIO with ADC1 AIN9, PTC X9/Y9, SPI0 SS (alternate), TCA0 WO3 (alternate) and CCL LUT1-IN0 functions. |
| 21 | PC4 | bidirectional | PORTC pin 4 GPIO with ADC1 AIN10, PTC X10/Y10, TCA0 WO4 (alternate), TCB1 WO (alternate) and CCL LUT1-IN1 functions. |
| 22 | PC5 | bidirectional | PORTC pin 5 GPIO with ADC1 AIN11, PTC X11/Y11, TCA0 WO5 (alternate) and CCL LUT1-IN2 functions. |
| 23 | PA0/RESET/UPDI | bidirectional | PORTA pin 0 that is the RESET and single-pin UPDI programming/debug pin (function set by the RSTPINCFG fuse), also ADC0 AIN0 and CCL LUT0-IN0. |
| 24 | PA1 | bidirectional | PORTA pin 1 GPIO with ADC0 AIN1, USART0 TxD (alternate), SPI0 MOSI, TWI0 SDA (alternate) and CCL 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 | VQFN-24-EP(4x4) |
| Category | Single Chip Microcomputer/Microcontroller |
| 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 | 2.7 |  | 5.5 | V | ATtiny1617-MFR ordering table | 566 |
| Operating temperature range |  | -40 |  | 125 | °C | F = -40°C to +125°C | 566 |
| Max. CPU speed |  |  |  | 16 | MHz | ATtiny1617-MFR ordering table | 566 |

## 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. | 461 |

## CAD (KiCad official)

- Symbol: `ATTINY1617-MFR`
- Footprint: `Package_DFN_QFN:QFN-24-1EP_4x4mm_P0.5mm_EP2.6x2.6mm`
- 3D model: VQFN-24-EP(4x4) (KiCad packages3D, STEP)
- 3D model files: `attiny1617-mfr-etched.step` / `attiny1617-mfr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `attiny1617-mfr.step` / `attiny1617-mfr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Microchip Tech datasheet](docs/attiny1617-mfr-datasheet.pdf) (598 pp, sha256 `2a74721fd9d658a4`, retrieved 2026-11-02, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text), 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/attiny1617-mfr-datasheet.pdf)