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ATSAMD20E18A-AU

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

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ATSAMD20E18A-AU

Microchip Tech · Pre-ordered MCUs · TQFP-32(7x7)

ATSAMD20E18A-AU 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 Port A general-purpose I/O pin PA00 (VDDANA domain) with EXTINT[0], SERCOM1 PAD[0] and TC2 WO[0] peripheral functions, and XIN32 32 kHz crystal input when XOSC32K is used.
2 PA01 bidirectional Port A general-purpose I/O pin PA01 (VDDANA domain) with EXTINT[1], SERCOM1 PAD[1] and TC2 WO[1] peripheral functions, and XOUT32 32 kHz crystal output when XOSC32K is used.
3 PA02 bidirectional Port A general-purpose I/O pin PA02 (VDDANA domain) with EXTINT[2], analog input AIN[0], PTC Y[0] and DAC output VOUT functions.
4 PA03 bidirectional Port A general-purpose I/O pin PA03 (VDDANA domain) with EXTINT[3], ADC/DAC VREFA reference input, and analog input AIN[1] with PTC Y[1].
5 PA04 bidirectional Port A general-purpose I/O pin PA04 (VDDANA domain) with EXTINT[4], ADC VREFB reference input, analog input AIN[4] and AIN[0] with PTC Y[2], SERCOM0 PAD[0] and TC0 WO[0].
6 PA05 bidirectional Port A general-purpose I/O pin PA05 (VDDANA domain) with EXTINT[5], analog inputs AIN[5] and AIN[1] with PTC Y[3], SERCOM0 PAD[1] and TC0 WO[1].
7 PA06 bidirectional Port A general-purpose I/O pin PA06 (VDDANA domain) with EXTINT[6], analog inputs AIN[6] and AIN[2] with PTC Y[4], SERCOM0 PAD[2] and TC1 WO[0].
8 PA07 bidirectional Port A general-purpose I/O pin PA07 (VDDANA domain) with EXTINT[7], analog inputs AIN[7] and AIN[3] with PTC Y[5], SERCOM0 PAD[3] and TC1 WO[1].
9 VDDANA power_in Analog supply pin powering the ADC, AC, DAC, PTC and 32 kHz oscillators, with voltage 1.62 V to 3.63 V; VDDIO and VDDANA are internally connected in this package.
10 GND power_in Ground pin for the digital power domain.
11 PA08 bidirectional Port A general-purpose I/O pin PA08 (VDDIO domain) with I2C, NMI, analog input AIN[16], PTC X[0], SERCOM0 PAD[0], SERCOM2 PAD[0] and TC0 WO[0].
12 PA09 bidirectional Port A general-purpose I/O pin PA09 (VDDIO domain) with I2C, EXTINT[9], analog input AIN[17], PTC X[1], SERCOM0 PAD[1], SERCOM2 PAD[1] and TC0 WO[1].
13 PA10 bidirectional Port A general-purpose I/O pin PA10 (VDDIO domain) with EXTINT[10], analog input AIN[18], PTC X[2], SERCOM0 PAD[2], SERCOM2 PAD[2], TC1 WO[0] and GCLK_IO[4].
14 PA11 bidirectional Port A general-purpose I/O pin PA11 (VDDIO domain) with EXTINT[11], analog input AIN[19], PTC X[3], SERCOM0 PAD[3], SERCOM2 PAD[3], TC1 WO[1] and GCLK_IO[5].
15 PA14 bidirectional Port A general-purpose I/O pin PA14 (VDDIO domain) with EXTINT[14], SERCOM2 PAD[2], SERCOM4 PAD[2], TC3 WO[0] and GCLK_IO[0]; it is also the XIN crystal oscillator input when XOSC is used.
16 PA15 bidirectional Port A general-purpose I/O pin PA15 (VDDIO domain) with EXTINT[15], SERCOM2 PAD[3], SERCOM4 PAD[3], TC3 WO[1] and GCLK_IO[1]; it is also the XOUT crystal oscillator output when XOSC is used.
17 PA16 bidirectional Port A general-purpose I/O pin PA16 (VDDIO domain) with I2C, EXTINT[0], PTC X[4], SERCOM1 PAD[0], SERCOM3 PAD[0], TC2 WO[0] and GCLK_IO[2].
18 PA17 bidirectional Port A general-purpose I/O pin PA17 (VDDIO domain) with I2C, EXTINT[1], PTC X[5], SERCOM1 PAD[1], SERCOM3 PAD[1], TC2 WO[1] and GCLK_IO[3].
19 PA18 bidirectional Port A general-purpose I/O pin PA18 (VDDIO domain) with EXTINT[2], PTC X[6], SERCOM1 PAD[2], SERCOM3 PAD[2], TC3 WO[0] and AC CMP[0].
20 PA19 bidirectional Port A general-purpose I/O pin PA19 (VDDIO domain) with EXTINT[3], PTC X[7], SERCOM1 PAD[3], SERCOM3 PAD[3], TC3 WO[1] and AC CMP[1].
21 PA22 bidirectional Port A general-purpose I/O pin PA22 (VDDIO domain) with I2C, EXTINT[6], PTC X[10], SERCOM3 PAD[0], SERCOM5 PAD[0], TC4 WO[0] and GCLK_IO[6].
22 PA23 bidirectional Port A general-purpose I/O pin PA23 (VDDIO domain) with I2C, EXTINT[7], PTC X[11], SERCOM3 PAD[1], SERCOM5 PAD[1], TC4 WO[1] and GCLK_IO[7].
23 PA24 bidirectional Port A general-purpose I/O pin PA24 (VDDIO domain) with EXTINT[12], SERCOM3 PAD[2], SERCOM5 PAD[2] and TC5 WO[0].
24 PA25 bidirectional Port A general-purpose I/O pin PA25 (VDDIO domain) with EXTINT[13], SERCOM3 PAD[3], SERCOM5 PAD[3] and TC5 WO[1].
25 PA27 bidirectional Port A general-purpose I/O pin PA27 (VDDIO domain) with EXTINT[15] and GCLK_IO[0].
26 RESET input External active-low reset input; the RESET pin has an internal pull-up and its low-level threshold is below 0.33 times VDDIO for 1.6 V to 2.0 V VDDIO or below 0.36 times VDDIO for 2.7 V to 3.6 V VDDIO.
27 PA28 bidirectional Port A general-purpose I/O pin PA28 (VDDIO domain) with EXTINT[8] and GCLK_IO[0].
28 GND power_in Ground pin for the digital power domain.
29 VDDCORE power_out Internal regulated core voltage output of 1.2 V that powers the core, memories, peripherals and DFLL48M, decoupled per the schematic checklist.
30 VDDIN power_in Input supply for I/O lines and the internal voltage regulator, operating from 1.62 V to 3.63 V.
31 PA30 bidirectional Port A general-purpose I/O pin PA30 (VDDIO domain) with EXTINT[10], SERCOM1 PAD[2], TC1 WO[0], GCLK_IO[0] and the SWCLK serial wire debug clock function.
32 PA31 bidirectional Port A general-purpose I/O pin PA31 (VDDIO domain) with EXTINT[11], SERCOM1 PAD[3] and TC1 WO[1], and the SWDIO serial wire debug data function active when a debugger is present.

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
I/O supply voltage VDDIO 1.62 3.63 V Powers I/O lines, OSC8M and XOSC 27
Input supply voltage VDDIN 1.62 3.63 V Powers I/O lines and the internal regulator 27
Analog supply voltage VDDANA 1.62 3.63 V Powers I/O lines and ADC, AC, DAC, PTC, OSCULP32K, OSC32K, XOSC32K 27
Operating temperature -40 85 °C Grade U (-40 to 85 °C) with 1.62V-3.63V, DC up to 48 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: ATSAMD20E18A-AU
  • Footprint: Package_QFP:TQFP-32_7x7mm_P0.8mm
  • 3D model: TQFP-32(7x7) (KiCad packages3D, STEP)
  • 3D model files: atsamd20e18a-au-etched.step / atsamd20e18a-au-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); atsamd20e18a-au.step / atsamd20e18a-au.glb are the bare package body.

Provenance

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

  • Datasheet: Microchip Tech datasheet (731 pp, sha256 2505526f248dd8c2, retrieved 2026-10-27, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus off (skipped (clean text read)), 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