# ATSAMD20E16A-MNT

**Microchip Tech** · Pre-ordered MCUs · QFN-32-EP(5x5)

ATSAMD20E16A-MNT from Microchip Tech, in a QFN-32-EP(5x5). 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 | PA00 | bidirectional | General-purpose I/O on VDDANA with EXTINT[0], SERCOM1/PAD[0], TC2/WO[0] and XIN32 (32 kHz crystal input) functions. |
| 2 | PA01 | bidirectional | General-purpose I/O on VDDANA with EXTINT[1], SERCOM1/PAD[1], TC2/WO[1] and XOUT32 (32 kHz crystal output) functions. |
| 3 | PA02 | bidirectional | General-purpose I/O on VDDANA with EXTINT[2], ADC AIN[0], PTC Y[0] and DAC VOUT functions. |
| 4 | PA03 | bidirectional | General-purpose I/O on VDDANA with EXTINT[3], ADC/DAC VREFA, ADC AIN[1] and PTC Y[1] functions. |
| 5 | PA04 | bidirectional | General-purpose I/O on VDDANA with EXTINT[4], ADC VREFB, ADC AIN[4], AC AIN[0], PTC Y[2], SERCOM0/PAD[0] and TC0/WO[0] functions. |
| 6 | PA05 | bidirectional | General-purpose I/O on VDDANA with EXTINT[5], ADC AIN[5], AC AIN[1], PTC Y[3], SERCOM0/PAD[1] and TC0/WO[1] functions. |
| 7 | PA06 | bidirectional | General-purpose I/O on VDDANA with EXTINT[6], ADC AIN[6], AC AIN[2], PTC Y[4], SERCOM0/PAD[2] and TC1/WO[0] functions. |
| 8 | PA07 | bidirectional | General-purpose I/O on VDDANA with EXTINT[7], ADC AIN[7], AC AIN[3], PTC Y[5], SERCOM0/PAD[3] and TC1/WO[1] functions. |
| 9 | VDDANA | power_in | Analog supply (1.62V to 3.63V) powering ADC, AC, DAC, PTC and the 32 kHz oscillators; internally connected to VDDIO in this package. |
| 10 | GND | power_in | Ground. |
| 11 | PA08 | bidirectional | General-purpose I/O on VDDIO, I2C-capable, with NMI, ADC AIN[16], PTC X[0], SERCOM0/PAD[0], SERCOM2/PAD[0] and TC0/WO[0] functions. |
| 12 | PA09 | bidirectional | General-purpose I/O on VDDIO, I2C-capable, with EXTINT[9], ADC AIN[17], PTC X[1], SERCOM0/PAD[1], SERCOM2/PAD[1] and TC0/WO[1] functions. |
| 13 | PA10 | bidirectional | General-purpose I/O on VDDIO with EXTINT[10], ADC AIN[18], PTC X[2], SERCOM0/PAD[2], SERCOM2/PAD[2], TC1/WO[0] and GCLK_IO[4] functions. |
| 14 | PA11 | bidirectional | General-purpose I/O on VDDIO with EXTINT[11], ADC AIN[19], PTC X[3], SERCOM0/PAD[3], SERCOM2/PAD[3], TC1/WO[1] and GCLK_IO[5] functions. |
| 15 | PA14 | bidirectional | General-purpose I/O on VDDIO with EXTINT[14], SERCOM2/PAD[2], TC3/WO[0], GCLK_IO[0] and XIN (crystal oscillator input) functions. |
| 16 | PA15 | bidirectional | General-purpose I/O on VDDIO with EXTINT[15], SERCOM2/PAD[3], TC3/WO[1], GCLK_IO[1] and XOUT (crystal oscillator output) functions. |
| 17 | PA16 | bidirectional | General-purpose I/O on VDDIO, I2C-capable, with EXTINT[0], PTC X[4], SERCOM1/PAD[0], SERCOM3/PAD[0], TC2/WO[0] and GCLK_IO[2] functions. |
| 18 | PA17 | bidirectional | General-purpose I/O on VDDIO, I2C-capable, with EXTINT[1], PTC X[5], SERCOM1/PAD[1], SERCOM3/PAD[1], TC2/WO[1] and GCLK_IO[3] functions. |
| 19 | PA18 | bidirectional | General-purpose I/O on VDDIO with EXTINT[2], PTC X[6], SERCOM1/PAD[2], SERCOM3/PAD[2], TC3/WO[0] and AC CMP[0] functions. |
| 20 | PA19 | bidirectional | General-purpose I/O on VDDIO with EXTINT[3], PTC X[7], SERCOM1/PAD[3], SERCOM3/PAD[3], TC3/WO[1] and AC CMP[1] functions. |
| 21 | PA22 | bidirectional | General-purpose I/O on VDDIO, I2C-capable, with EXTINT[6], PTC X[10], SERCOM3/PAD[0], TC4/WO[0] and GCLK_IO[6] functions. |
| 22 | PA23 | bidirectional | General-purpose I/O on VDDIO, I2C-capable, with EXTINT[7], PTC X[11], SERCOM3/PAD[1], TC4/WO[1] and GCLK_IO[7] functions. |
| 23 | PA24 | bidirectional | General-purpose I/O on VDDIO with EXTINT[12], SERCOM3/PAD[2] and TC5/WO[0] functions. |
| 24 | PA25 | bidirectional | General-purpose I/O on VDDIO with EXTINT[13], SERCOM3/PAD[3] and TC5/WO[1] functions. |
| 25 | PA27 | bidirectional | General-purpose I/O on VDDIO with EXTINT[15] and GCLK_IO[0] functions. |
| 26 | RESET | input | Active-low external reset input with internal pull-up; low-level threshold below 0.33*VDDIO (1.6V-2.0V) or 0.36*VDDIO (2.7V-3.6V). |
| 27 | PA28 | bidirectional | General-purpose I/O on VDDIO with EXTINT[8] and GCLK_IO[0] functions. |
| 28 | GND | power_in | Ground. |
| 29 | VDDCORE | power_out | Internal regulator output (1.2V nominal) powering the core, memories, peripherals and DFLL48M; requires external 1uF decoupling capacitor. |
| 30 | VDDIN | power_in | Input supply (1.62V to 3.63V) powering I/O lines and the internal voltage regulator. |
| 31 | PA30 | bidirectional | General-purpose I/O on VDDIO that is the SWCLK serial wire debug clock (1kOhm pull-up recommended), also EXTINT[10], SERCOM1/PAD[2], TC1/WO[0] and GCLK_IO[0]. |
| 32 | PA31 | bidirectional | General-purpose I/O on VDDIO that is the SWDIO serial wire debug data pin (active only when a debugger is present), also EXTINT[11], SERCOM1/PAD[3] and TC1/WO[1]. |
| 33 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | QFN-32-EP(5x5) |
| Category | Embedded Processors & Controllers |
| Pins | 33 |

## 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 range | VDD | 1.62 |  | 3.63 | V | -40°C to +105°C | 1 |
| Operating temperature |  | -40 |  | 105 | °C | 1.62V - 3.63V | 1 |
| Maximum CPU frequency |  |  |  | 32 | MHz | 1.62V - 3.63V, -40°C to +105°C, DC up to 32 MHz | 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. | 551 |

## CAD (KiCad official)

- Symbol: `ATSAMD20E16A-MNT`
- Footprint: `Package_DFN_QFN:QFN-32-1EP_5x5mm_P0.5mm_EP3.3x3.3mm`
- 3D model: QFN-32-EP(5x5) (KiCad packages3D, STEP)
- 3D model files: `atsamd20e16a-mnt-etched.step` / `atsamd20e16a-mnt-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `atsamd20e16a-mnt.step` / `atsamd20e16a-mnt.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Microchip Tech datasheet](docs/atsamd20e16a-mnt-datasheet.pdf) (731 pp, sha256 `2505526f248dd8c2`, retrieved 2026-10-30, 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/atsamd20e16a-mnt-datasheet.pdf)