# ATTINY814-SSF

**Microchip Tech** · Microcontrollers (MCU/MPU/SOC) · SOIC-14

ATTINY814-SSF from Microchip Tech, in a SOIC-14. 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 | VDD | power_in | Power supply pin for the device, placed on the VDD power domain. |
| 2 | PA4 | bidirectional | General-purpose I/O pin PA4 on the VDD domain, also ADC0 input AIN4, PTC X0/Y0, USART0 XDIR (alternate position), SPI0 SS, TCA0 WO4 and WOA, and CCL LUT0-OUT. |
| 3 | PA5 | bidirectional | General-purpose I/O pin PA5 on the VDD domain, also ADC0 input AIN5, PTC X1/Y1, DAC0 OUT, TCA0 WO5 and WO, and TCB1 WOB. |
| 4 | PA6 | bidirectional | General-purpose I/O pin PA6 on the VDD domain, also ADC0 input AIN6, PTC X2/Y2, AC0 negative input AINN0, and DAC0 OUT (PA6 is the DAC0 output pin). |
| 5 | PA7 | bidirectional | General-purpose I/O pin PA7 on the VDD domain, also ADC0 input AIN7, PTC X3/Y3, AC0 positive input AINP0, and CCL LUT1-OUT. |
| 6 | PB3 | bidirectional | General-purpose I/O pin PB3, also the TOSC1 crystal oscillator input, USART0 RxD (alternate position) and TCA0 WO0 (alternate position). |
| 7 | PB2 | bidirectional | General-purpose I/O pin PB2, also the TOSC2 crystal oscillator output, EVSYS EVOUT1, USART0 TxD and TCA0 WO2. |
| 8 | PB1 | bidirectional | General-purpose I/O pin PB1, also ADC0 input AIN10, PTC X4/Y4, USART0 XCK, TWI0 SDA and TCA0 WO1. |
| 9 | PB0 | bidirectional | General-purpose I/O pin PB0, also ADC0 input AIN11, PTC X5/Y5, USART0 XDIR, TWI0 SCL and TCA0 WO0. |
| 10 | PA0 (RESET/UPDI) | bidirectional | Pin PA0 is the RESET or single-pin UPDI programming/debug interface, selected by the RSTPINCFG fuse; it can also serve as ADC0 input AIN0 and CCL LUT0-IN0 when used as GPIO. |
| 11 | PA1 | bidirectional | General-purpose I/O pin PA1, also ADC0 input AIN1, USART0 TxD (alternate position), SPI0 MOSI, TWI0 SDA (alternate position) and CCL LUT0-IN1. |
| 12 | PA2 | bidirectional | General-purpose I/O pin PA2, also EVSYS EVOUT0, ADC0 input AIN2, USART0 RxD (alternate position), SPI0 MISO, TWI0 SCL (alternate position) and CCL LUT0-IN2. |
| 13 | PA3 (EXTCLK) | bidirectional | General-purpose I/O pin PA3, also the external clock input EXTCLK, ADC0 input AIN3, USART0 XCK (alternate position), SPI0 SCK and TCA0 WO3. |
| 14 | GND | power_in | Ground reference pin for the device. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | SOIC-14 |
| Category | Embedded Processors & Controllers |
| Pins | 14 |

## 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 |  | 560 |
| Operating temperature range |  | -40 |  | 125 | °C |  | 560 |
| Max. CPU speed |  |  |  | 16 | MHz |  | 560 |

## 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: `ATTINY814-SSF`
- Footprint: `Package_SO:SOIC-14_3.9x8.7mm_P1.27mm`
- 3D model: SOIC-14 (KiCad packages3D, STEP)
- 3D model files: `attiny814-ssf-etched.step` / `attiny814-ssf-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `attiny814-ssf.step` / `attiny814-ssf.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Microchip Tech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588938679474012160) (596 pp, sha256 `c2392fe1c4c9666a`, retrieved 2026-10-18, tier: lcsc)
- **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/attiny814-ssf-datasheet.pdf)