# ATSAMC21E16A-AUT

**Microchip Tech** · Microcontroller Units (MCUs/MPUs/SOCs) · TQFP-32(7x7)

ATSAMC21E16A-AUT from Microchip Tech, in a TQFP-32(7x7). 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 supply with EXTINT[0], SERCOM1/PAD[0], TCC2/WO[0], CMP[2], and XIN32 (32.768 kHz crystal input). |
| 2 | PA01 | bidirectional | General-purpose I/O on VDDANA supply with EXTINT[1], SERCOM1/PAD[1], TCC2/WO[1], CMP[3], and XOUT32 (32.768 kHz crystal output). |
| 3 | PA02 | bidirectional | General-purpose I/O on VDDANA supply with EXTINT[2], ADC0 AIN[0], ADC1 AIN[4], PTC Y[0], and DAC VOUT. |
| 4 | PA03 | bidirectional | General-purpose I/O on VDDANA supply with EXTINT[3], ADC/DAC external reference VREFA, ADC0 AIN[1], ADC1 AIN[5], and PTC Y[1]. |
| 5 | PA04 | bidirectional | General-purpose I/O on VDDANA supply with EXTINT[4], SDADC reference VREFB, ADC0 AIN[4], ADC1 AIN[0], PTC Y[2], SERCOM0/PAD[0], TCC0/WO[0], and CCL0/IN[0]. |
| 6 | PA05 | bidirectional | General-purpose I/O on VDDANA supply with EXTINT[5], ADC0 AIN[5], ADC1 AIN[1], PTC Y[3], SERCOM0/PAD[1], TCC0/WO[1], and CCL0/IN[1]. |
| 7 | PA06 | bidirectional | General-purpose I/O on VDDANA supply with EXTINT[6], ADC0 AIN[6], ADC1 AIN[2], PTC Y[4], SDADC AINN[0], SERCOM0/PAD[2], TCC1/WO[0], and CCL0/IN[2]. |
| 8 | PA07 | bidirectional | General-purpose I/O on VDDANA supply with EXTINT[7], ADC0 AIN[7], ADC1 AIN[3], PTC Y[5], SDADC AINP[0], SERCOM0/PAD[3], TCC1/WO[1], and CCL0/OUT[0]. |
| 9 | VDDANA | power_in | Analog supply input for the analog peripherals and the VDDANA-powered I/O pins (device operating range 2.7V to 5.5V). |
| 10 | GND | power_in | Ground. |
| 11 | PA08 | bidirectional | General-purpose I/O on VDDIO supply with NMI, ADC0 AIN[8], ADC1 AIN[10], PTC X[0]/Y[16], SERCOM0/PAD[0], SERCOM2/PAD[0], TCC0/WO[0], TCC1/WO[2], and CCL1/IN[3]; supports I2C. |
| 12 | PA09 | bidirectional | General-purpose I/O on VDDIO supply with EXTINT[9], ADC0 AIN[9], ADC1 AIN[11], PTC X[1]/Y[17], SERCOM0/PAD[1], SERCOM2/PAD[1], TCC0/WO[1], TCC1/WO[3], and CCL1/IN[4]; supports I2C. |
| 13 | PA10 | bidirectional | General-purpose I/O on VDDIO supply with EXTINT[10], ADC0 AIN[10], PTC X[2]/Y[18], SERCOM0/PAD[2], SERCOM2/PAD[2], TCC1/WO[0], TCC0/WO[2], GCLK_IO[4], and CCL1/IN[5]. |
| 14 | PA11 | bidirectional | General-purpose I/O on VDDIO supply with EXTINT[11], ADC0 AIN[11], PTC X[3]/Y[19], SERCOM0/PAD[3], SERCOM2/PAD[3], TCC1/WO[1], TCC0/WO[3], GCLK_IO[5], and CCL1/OUT[1]. |
| 15 | PA14 | bidirectional | General-purpose I/O on VDDIO supply with EXTINT[14], SERCOM2/PAD[2], SERCOM4/PAD[2], TC4/WO[0], TCC0/WO[4], GCLK_IO[0], and XIN (crystal or external clock input). |
| 16 | PA15 | bidirectional | General-purpose I/O on VDDIO supply with EXTINT[15], SERCOM2/PAD[3], SERCOM4/PAD[3], TC4/WO[1], TCC0/WO[5], GCLK_IO[1], and XOUT (crystal output). |
| 17 | PA16 | bidirectional | General-purpose I/O on VDDIO supply with EXTINT[0], PTC X[4]/Y[20], SERCOM1/PAD[0], SERCOM3/PAD[0], TCC2/WO[0], TCC0/WO[6], GCLK_IO[2], and CCL0/IN[0]; supports I2C. |
| 18 | PA17 | bidirectional | General-purpose I/O on VDDIO supply with EXTINT[1], PTC X[5]/Y[21], SERCOM1/PAD[1], SERCOM3/PAD[1], TCC2/WO[1], TCC0/WO[7], GCLK_IO[3], and CCL0/IN[1]; supports I2C. |
| 19 | PA18 | bidirectional | General-purpose I/O on VDDIO supply with EXTINT[2], PTC X[6]/Y[22], SERCOM1/PAD[2], SERCOM3/PAD[2], TC4/WO[0], TCC0/WO[2], AC CMP[0], and CCL0/IN[2]. |
| 20 | PA19 | bidirectional | General-purpose I/O on VDDIO supply with EXTINT[3], PTC X[7]/Y[23], SERCOM1/PAD[3], SERCOM3/PAD[3], TC4/WO[1], TCC0/WO[3], AC CMP[1], and CCL0/OUT[0]. |
| 21 | PA22 | bidirectional | General-purpose I/O on VDDIO supply with EXTINT[6], PTC X[10]/Y[26], SERCOM3/PAD[0], SERCOM5/PAD[0], TC0/WO[0], TCC0/WO[4], GCLK_IO[6], and CCL2/IN[6]; supports I2C. |
| 22 | PA23 | bidirectional | General-purpose I/O on VDDIO supply with EXTINT[7], PTC X[11]/Y[27], SERCOM3/PAD[1], SERCOM5/PAD[1], TC0/WO[1], TCC0/WO[5], GCLK_IO[7], and CCL2/IN[7]; supports I2C. |
| 23 | PA24 | bidirectional | General-purpose I/O on VDDIO supply with EXTINT[12], SERCOM3/PAD[2], SERCOM5/PAD[2], TC1/WO[0], TCC1/WO[2], CAN0/TX, AC CMP[2], and CCL2/IN[8]. |
| 24 | PA25 | bidirectional | General-purpose I/O on VDDIO supply with EXTINT[13], SERCOM3/PAD[3], SERCOM5/PAD[3], TC1/WO[1], TCC1/WO[3], CAN0/RX, AC CMP[3], and CCL2/OUT[2]. |
| 25 | PA27 | bidirectional | General-purpose I/O on VDDIN supply with EXTINT[15] and GCLK_IO[0]. |
| 26 | RESET | input | Active-low external reset input. |
| 27 | PA28 | bidirectional | General-purpose I/O on VDDIN supply with EXTINT[8] and GCLK_IO[0]. |
| 28 | GND | power_in | Ground. |
| 29 | VDDCORE | power_out | Regulated output supply for the core, to be decoupled externally. |
| 30 | VDDIN | power_in | Main input supply (device operating range 2.7V to 5.5V). |
| 31 | PA30 | bidirectional | General-purpose I/O on VDDIN supply with EXTINT[10], SERCOM1/PAD[2], TCC1/WO[0], GCLK_IO[0], CCL1/IN[3], and SWCLK serial wire debug clock. |
| 32 | PA31 | bidirectional | General-purpose I/O on VDDIN supply with EXTINT[11], SERCOM1/PAD[3], TCC1/WO[1], CCL1/OUT[1], and SWDIO serial wire debug data. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | TQFP-32(7x7) |
| Category | Single Chip Microcomputer/Microcontroller |
| Pins | 32 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Operating supply voltage | VDD | 2.7 |  | 5.5 | V | VDDIO: Powers I/O lines and XOSC. Voltage is 2.70V to 5.50V; VDDIN/VDDANA same | 38 |
| Operating temperature (AEC-Q100 Grade 1) |  | -40 |  | 125 | °C | DC to 48 MHz | 1 |
| VDDCORE internal regulated voltage | VDDCORE |  | 1.2 |  | V | Internal regulated voltage output | 38 |

## 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 |
|---|---|---|---|---|
| housing | PC |  | 10.3. Micro Trace Buffer MTB base address corrected from 0x41006000 to 0x41008000. 22. SUPC, Supply Controller 22.6.3.3. VDD Brown-Out Detector (BODVDD): Removed | 1198 |
| 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. | 987 |

## CAD (KiCad official)

- Symbol: `ATSAMC21E16A-AUT`
- Footprint: `Package_QFP:TQFP-32_7x7mm_P0.8mm`
- 3D model: TQFP-32(7x7) (KiCad packages3D, STEP)
- 3D model files: `atsamc21e16a-aut-etched.step` / `atsamc21e16a-aut-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `atsamc21e16a-aut.step` / `atsamc21e16a-aut.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Microchip Tech datasheet](docs/atsamc21e16a-aut-datasheet.pdf) (1206 pp, sha256 `5991eaad10c5cd35`, retrieved 2026-11-13, 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/atsamc21e16a-aut-datasheet.pdf)