# ATTINY1616-MNR

**Microchip Tech** · Microcontrollers (MCU/MPU/SOC) · QFN-20-EP(3x3)

ATTINY1616-MNR from Microchip Tech, in a QFN-20-EP(3x3). 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 | Port A I/O pin PA2, which also serves as EVOUT0, AIN2, USART0 RXD (alternate), SPI0 MISO (alternate) and TWI0 SCL (alternate) per the multiplexing table. |
| 2 | PA3/EXTCLK | bidirectional | Port A I/O pin PA3, which can also be the external clock input EXTCLK and serves AIN3 and SPI0 SCK as listed in the multiplexing table. |
| 3 | GND | power_in | Ground reference for the device. |
| 4 | VDD | power_in | Supply voltage; operating supply range is 1.8 V to 5.5 V. |
| 5 | PA4 | bidirectional | Port A I/O pin PA4, which also serves as analog input AIN4 and TCA0 WO4 per the multiplexing table. |
| 6 | PA5 | bidirectional | Port A I/O pin PA5, which can also be the external voltage reference VREFA and serves AIN5 per the multiplexing table. |
| 7 | PA6 | bidirectional | Port A I/O pin PA6, which also serves as analog input AIN6 and the DAC0 output per the multiplexing table. |
| 8 | PA7 | bidirectional | Port A I/O pin PA7, which also serves as analog input AIN7 per the multiplexing table. |
| 9 | PB5 | bidirectional | Port B I/O pin PB5, which can also be the CLKOUT output and serves analog input AIN8 per the multiplexing table. |
| 10 | PB4 | bidirectional | Port B I/O pin PB4, which also serves as analog input AIN9 per the multiplexing table. |
| 11 | PB3/TOSC2 | bidirectional | Port B I/O pin PB3, which can also be the 32.768 kHz crystal oscillator connection TOSC2 per the pinout diagram. |
| 12 | PB2/TOSC2 | bidirectional | Port B I/O pin PB2, which can also be the 32.768 kHz crystal oscillator connection TOSC1 per the pinout diagram. |
| 13 | PB1 | bidirectional | Port B I/O pin PB1, which also serves as analog input AIN10 per the multiplexing table. |
| 14 | PB0 | bidirectional | Port B I/O pin PB0, which also serves as analog input AIN11 per the multiplexing table. |
| 15 | PC0 | bidirectional | Port C I/O pin PC0, which also serves as analog input AIN6 per the multiplexing table. |
| 16 | PC1 | bidirectional | Port C I/O pin PC1, which also serves as analog input AIN7 per the multiplexing table. |
| 17 | PC2 | bidirectional | Port C I/O pin PC2, which can also be the event output EVOUT2 and serves analog input AIN8 per the multiplexing table. |
| 18 | PC3 | bidirectional | Port C I/O pin PC3, which also serves as analog input AIN9 per the multiplexing table. |
| 19 | PA0/RESET/UPDI | bidirectional | Single-pin programming and debug interface pin, which is configured as RESET or UPDI by fuse RSTPINCFG, otherwise GPIO. |
| 20 | PA1 | bidirectional | Port A I/O pin PA1, which also serves as analog input AIN1 and USART0 TXD (alternate) per the multiplexing table. |
| 21 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | QFN-20-EP(3x3) |
| Category | Embedded Processors & Controllers |
| Pins | 21 |

## 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 |  | 1.8 |  | 5.5 | V | ATtiny1616-MNR ordering row, 20 MHz VQFN variant | 566 |
| Temperature range |  | -40 |  | 105 | °C | ATtiny1616-MNR ordering row, 20 MHz VQFN variant | 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: `ATTINY1616-MNR`
- Footprint: `Package_DFN_QFN:QFN-20-1EP_3x3mm_P0.4mm_EP1.65x1.65mm`
- 3D model: QFN-20-EP(3x3), generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 0.85 mm nominal QFN height). Neither the vendor nor KiCad ships a 3D model for this package, so the dimensions are nominal, not the manufacturer's CAD (STEP)
- 3D model files: `attiny1616-mnr-etched.step` / `attiny1616-mnr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `attiny1616-mnr.step` / `attiny1616-mnr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Microchip Tech datasheet](http://ww1.microchip.com/downloads/en/DeviceDoc/ATtiny1614-16-17-DataSheet-DS40002204A.pdf) (598 pp, sha256 `382df42b05acd53e`, retrieved 2026-11-06, 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/attiny1616-mnr-datasheet.pdf)