# ATTINY1606-MNR

**Microchip Tech** · Microcontroller Units (MCUs/MPUs/SOCs) · QFN-20-EP(3x3)

ATTINY1606-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 bit 2 with alternate functions EVOUT0, ADC input AIN2, USART0 RxD (alternate position), SPI0 MISO and CCL LUT0-IN2, and full asynchronous pin-change sensing. |
| 2 | PA3 (EXTCLK) | bidirectional | Port A bit 3 with alternate functions EXTCLK external clock input, ADC input AIN3, USART0 XCK (alternate position), SPI0 SCK and TCA0 WO3. |
| 3 | GND | power_in | Ground reference pin of the device. |
| 4 | VDD | power_in | Power supply pin; operating supply voltage is 1.8 V to 5.5 V. |
| 5 | PA4 | bidirectional | Port A bit 4 with alternate functions ADC input AIN4, USART0 XDIR (alternate position), SPI0 SS, TCA0 WO4 and CCL LUT0-OUT. |
| 6 | PA5 | bidirectional | Port A bit 5 with alternate functions ADC input AIN5, Analog Comparator output OUT, TCA0 WO5 and TCB0 WO. |
| 7 | PA6 | bidirectional | Port A bit 6 with alternate functions ADC input AIN6 and Analog Comparator negative input AINN0; full asynchronous pin-change sensing. |
| 8 | PA7 | bidirectional | Port A bit 7 with alternate functions ADC input AIN7, Analog Comparator positive input AINP0 and CCL LUT1-OUT. |
| 9 | PB5 | bidirectional | Port B bit 5 with alternate functions CLKOUT, ADC input AIN8, Analog Comparator positive input AINP1 and TCA0 WO2 (alternate position). |
| 10 | PB4 | bidirectional | Port B bit 4 with alternate functions ADC input AIN9, Analog Comparator negative input AINN1, TCA0 WO1 (alternate position) and CCL LUT0-OUT (alternate position). |
| 11 | PB3 | bidirectional | Port B bit 3 with alternate functions USART0 RxD and TCA0 WO0 (alternate position). |
| 12 | PB2 | bidirectional | Port B bit 2 with alternate functions EVOUT1, USART0 TxD and TCA0 WO2; full asynchronous pin-change sensing. |
| 13 | PB1 | bidirectional | Port B bit 1 with alternate functions ADC input AIN10, USART0 XCK, TWI0 SDA and TCA0 WO1. |
| 14 | PB0 | bidirectional | Port B bit 0 with alternate functions ADC input AIN11, USART0 XDIR, TWI0 SCL and TCA0 WO0. |
| 15 | PC0 | bidirectional | Port C bit 0 with alternate functions SPI0 SCK (alternate position) and TCB0 WO (alternate position). |
| 16 | PC1 | bidirectional | Port C bit 1 with alternate functions SPI0 MISO (alternate position) and CCL LUT1-OUT (alternate position). |
| 17 | PC2 | bidirectional | Port C bit 2 with alternate functions EVOUT2 and SPI0 MOSI (alternate position); full asynchronous pin-change sensing. |
| 18 | PC3 | bidirectional | Port C bit 3 with alternate functions SPI0 SS (alternate position), TCA0 WO3 (alternate position) and CCL LUT1-IN0. |
| 19 | PA0 (RESET/UPDI) | bidirectional | Port A bit 0 shared with the RESET/UPDI pin, whose function is selected by RSTPINCFG in FUSE.SYSCFG0 (GPIO, UPDI or RESET); also ADC input AIN0 and CCL LUT0-IN0. |
| 20 | PA1 | bidirectional | Port A bit 1 with alternate functions ADC input AIN1, USART0 TxD (alternate position), SPI0 MOSI and CCL LUT0-IN1. |
| 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 | Single Chip Microcomputer/Microcontroller |
| 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 (VDD) for ATtiny1606-MNR |  | 1.8 |  | 5.5 | V | ATtiny1606-MNR ordering code, VQFN package | 493 |
| Maximum CPU speed for ATtiny1606-MNR |  |  |  | 20 | MHz | ATtiny1606-MNR ordering code, VQFN package, 1.8 V to 5.5 V | 493 |
| Temperature range for ATtiny1606-MNR |  | -40 |  | 105 | °C | ATtiny1606-MNR ordering code, VQFN package | 493 |

## CAD (KiCad official)

- Symbol: `ATTINY1606-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, 0.9 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: `attiny1606-mnr-etched.step` / `attiny1606-mnr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `attiny1606-mnr.step` / `attiny1606-mnr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Microchip Tech datasheet](docs/attiny1606-mnr-datasheet.pdf) (522 pp, sha256 `f5c03e904027d54c`, retrieved 2026-11-05, 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/attiny1606-mnr-datasheet.pdf)