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ATSAMC21E18A-AUT

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Microchip Tech MICROCHIP, TQFP-32(7x7). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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ATSAMC21E18A-AUT

Microchip Tech · MICROCHIP · TQFP-32(7x7)

ATSAMC21E18A-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] and AC/CMP[2]; also XIN32 for the 32.768kHz crystal oscillator.
2 PA01 bidirectional General-purpose I/O on VDDANA supply with EXTINT[1], SERCOM1 PAD[1], TCC2/WO[1] and AC/CMP[3]; also XOUT32 for the 32.768kHz crystal oscillator.
3 PA02 bidirectional General-purpose I/O on VDDANA supply with EXTINT[2], ADC input AIN[0], PTC Y[0] and DAC VOUT.
4 PA03 bidirectional General-purpose I/O on VDDANA supply with EXTINT[3], ADC/VREFA external reference (2.0V to VDDANA-0.6V for ADC), ADC AIN[1] and PTC Y[1].
5 PA04 bidirectional General-purpose I/O on VDDANA supply with EXTINT[4], ADC analog input, PTC Y[2], SERCOM0 PAD[0] and TCC0/WO[0].
6 PA05 bidirectional General-purpose I/O on VDDANA supply with EXTINT[5], ADC analog input, PTC Y[3], SERCOM0 PAD[1] and TCC0/WO[1].
7 PA06 bidirectional General-purpose I/O on VDDANA supply with EXTINT[6], ADC analog input, PTC Y[4], AC input INN[0], SERCOM0 PAD[2] and TCC1/WO[0].
8 PA07 bidirectional General-purpose I/O on VDDANA supply with EXTINT[7], ADC analog input, PTC Y[5], AC input INP[0], SERCOM0 PAD[3] and TCC1/WO[1].
9 VDDANA power_in Analog supply input, 2.7V to 5.5V, with 100nF and 10µF decoupling; on the 32-pin package it is also the supply pin for the VDDIO I/O group (GPIO cluster table).
10 GND power_in Ground pin (also the return for the analog domain on the 32-pin package).
11 PA08 bidirectional General-purpose I/O on VDDIO supply with NMI, ADC inputs, PTC X[0]/Y[16], SERCOM0/SERCOM2 PAD[0] (I2C capable) and TCC0/WO[0].
12 PA09 bidirectional General-purpose I/O on VDDIO supply with EXTINT[9], ADC inputs, PTC X[1]/Y[17], SERCOM0/SERCOM2 PAD[1] (I2C capable) and TCC0/WO[1].
13 PA10 bidirectional High-sink general-purpose I/O on VDDIO supply with EXTINT[10], PTC X[2]/Y[18], SERCOM0/SERCOM2 PAD[2], TCC1/WO[0] and GCLK_IO[4].
14 PA11 bidirectional High-sink general-purpose I/O on VDDIO supply with EXTINT[11], PTC X[3]/Y[19], SERCOM0/SERCOM2 PAD[3], TCC1/WO[1] and GCLK_IO[5].
15 PA14 bidirectional General-purpose I/O on VDDIO supply with EXTINT[14], SERCOM2/SERCOM4 PAD[2], TC4/WO[0] and GCLK_IO[0]; also XIN for the external crystal/clock oscillator.
16 PA15 bidirectional General-purpose I/O on VDDIO supply with EXTINT[15], SERCOM2/SERCOM4 PAD[3], TC4/WO[1] and GCLK_IO[1]; also XOUT for the external crystal oscillator.
17 PA16 bidirectional General-purpose I/O on VDDIO supply with EXTINT[0], PTC X[4]/Y[20], SERCOM1/SERCOM3 PAD[0] (I2C capable), TCC2/WO[0] and GCLK_IO[2].
18 PA17 bidirectional General-purpose I/O on VDDIO supply with EXTINT[1], PTC X[5]/Y[21], SERCOM1/SERCOM3 PAD[1] (I2C capable), TCC2/WO[1] and GCLK_IO[3].
19 PA18 bidirectional General-purpose I/O on VDDIO supply with EXTINT[2], PTC X[6]/Y[22], SERCOM1/SERCOM3 PAD[2], TC4/WO[0] and AC/CMP[0].
20 PA19 bidirectional General-purpose I/O on VDDIO supply with EXTINT[3], PTC X[7]/Y[23], SERCOM1/SERCOM3 PAD[3], TC4/WO[1] and AC/CMP[1].
21 PA22 bidirectional General-purpose I/O on VDDIO supply with EXTINT[6], PTC X[10]/Y[26], SERCOM3/SERCOM5 PAD[0] (I2C capable), TC0/WO[0] and GCLK_IO[6].
22 PA23 bidirectional General-purpose I/O on VDDIO supply with EXTINT[7], PTC X[11]/Y[27], SERCOM3/SERCOM5 PAD[1] (I2C capable), TC0/WO[1] and GCLK_IO[7].
23 PA24 bidirectional General-purpose I/O on VDDIO supply with EXTINT[12], SERCOM3 PAD[2], TC1/WO[0], CAN0/TX and AC/CMP[2].
24 PA25 bidirectional General-purpose I/O on VDDIO supply with EXTINT[13], SERCOM3 PAD[3], TC1/WO[1], CAN0/RX and AC/CMP[3].
25 PA27 bidirectional General-purpose I/O on VDDIN supply with EXTINT[15] and GCLK_IO[0].
26 RESETN input Active-low external reset input with internal pull-up; low-level threshold below 0.3*VDDIO.
27 PA28 bidirectional General-purpose I/O on VDDIN supply with EXTINT[8] and GCLK_IO[0].
28 GND power_in Ground pin.
29 VDDCORE power_out Regulated core supply output/external decoupling pin, 1.1V to 1.3V typical, with 100nF and 1µF capacitors.
30 VDDIN power_in Digital supply input, 2.7V to 5.5V, with 100nF and 10µF decoupling.
31 PA30 bidirectional General-purpose I/O on VDDIN supply with EXTINT[10] and SERCOM1 PAD[2]; also SWCLK serial wire debug clock (1kΩ pull-up recommended).
32 PA31 bidirectional General-purpose I/O on VDDIN supply with EXTINT[11] and SERCOM1 PAD[3]; also SWDIO serial wire debug data.

Key specifications

Parameter Value
Manufacturer Microchip Tech
Package TQFP-32(7x7)
Category Embedded Processors & Controllers
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 VDDIN and VDDANA at the same voltage 1
Operating temperature (U grade) -40 85 °C Ordering code U = -40 - 85°C 19
CPU clock frequency 48 MHz DC to 48 MHz 1
VDDCORE regulated output voltage VDDCORE 1.2 V Internal regulated voltage output 40

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 configurations, including indium tin oxide (ITO) sensor grids. The PTC requires one pin per X-line and one pin per Y-line. 977

CAD (KiCad official)

  • Symbol: ATSAMC21E18A-AUT
  • Footprint: Package_QFP:TQFP-32_7x7mm_P0.8mm
  • 3D model: TQFP-32(7x7) (KiCad packages3D, STEP)
  • 3D model files: atsamc21e18a-aut-etched.step / atsamc21e18a-aut-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); atsamc21e18a-aut.step / atsamc21e18a-aut.glb are the bare package body.

Provenance

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

  • Datasheet: Microchip Tech datasheet (1107 pp, sha256 57e02a68f2f793d5, retrieved 2026-10-27, 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