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Contents

Pinout
Key specifications
Materials and finish
CAD (KiCad official)
Provenance

README

markdown

ATSAMD21J17A-MU

Microchip Tech · Pre-ordered MCUs · QFN-64-EP(9x9)

ATSAMD21J17A-MU from Microchip Tech, in a QFN-64-EP(9x9). 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 on VDDANA, also EXTINT[0] and the XIN32 32kHz crystal input.
2	PA01	bidirectional	Port A general-purpose I/O pin on VDDANA, also EXTINT[1] and the XOUT32 32kHz crystal output.
3	PA02	bidirectional	Port A general-purpose I/O pin on VDDANA with analog input AIN[0], DAC output VOUT and EXTINT[2].
4	PA03	bidirectional	Port A general-purpose I/O pin on VDDANA with analog input AIN[1], ADC/DAC reference VREFA and EXTINT[3].
5	PB04	bidirectional	Port B general-purpose I/O pin on VDDANA with analog input AIN[12] and EXTINT[4].
6	PB05	bidirectional	Port B general-purpose I/O pin on VDDANA with analog input AIN[13] and EXTINT[5].
7	GNDANA	power_in	Ground for the analog section of the device.
8	VDDANA	power_in	Analog supply pin for the ADC, DAC and analog comparators; the SAM D21 operating range is 1.62V to 3.63V.
9	PB06	bidirectional	Port B general-purpose I/O pin on VDDANA with analog input AIN[14] and EXTINT[6].
10	PB07	bidirectional	Port B general-purpose I/O pin on VDDANA with analog input AIN[15] and EXTINT[7].
11	PB08	bidirectional	Port B general-purpose I/O pin on VDDANA with analog input AIN[2], SERCOM4 PAD[0] and EXTINT[8].
12	PB09	bidirectional	Port B general-purpose I/O pin on VDDANA with analog input AIN[3], SERCOM4 PAD[1] and EXTINT[9].
13	PA04	bidirectional	Port A general-purpose I/O pin on VDDANA with analog input AIN[4], SERCOM0 PAD[0] and EXTINT[4].
14	PA05	bidirectional	Port A general-purpose I/O pin on VDDANA with analog input AIN[5], SERCOM0 PAD[1] and EXTINT[5].
15	PA06	bidirectional	Port A general-purpose I/O pin on VDDANA with analog input AIN[6], SERCOM0 PAD[2] and EXTINT[6].
16	PA07	bidirectional	Port A general-purpose I/O pin on VDDANA with analog input AIN[7], SERCOM0 PAD[3] and EXTINT[7].
17	PA08	bidirectional	Port A general-purpose I/O pin on VDDIO with NMI, analog input AIN[16], SERCOM0/SERCOM2 PAD[0] and TCC0 WO[0].
18	PA09	bidirectional	Port A general-purpose I/O pin on VDDIO with EXTINT[9], analog input AIN[17], SERCOM0/SERCOM2 PAD[1] and TCC0 WO[1].
19	PA10	bidirectional	Port A general-purpose I/O pin on VDDIO with EXTINT[10], analog input AIN[18], SERCOM0/SERCOM2 PAD[2] and I2S MCK[0].
20	PA11	bidirectional	Port A general-purpose I/O pin on VDDIO with EXTINT[11], analog input AIN[19], SERCOM0/SERCOM2 PAD[3] and I2S SCK[0].
21	VDDIO	power_in	Digital I/O supply for the port pins; the SAM D21 operating range is 1.62V to 3.63V.
22	GND	power_in	Digital ground for the device.
23	PB10	bidirectional	Port B general-purpose I/O pin on VDDIO with EXTINT[10], SERCOM4 PAD[2], TC5 WO[0] and I2S MCK[1].
24	PB11	bidirectional	Port B general-purpose I/O pin on VDDIO with EXTINT[11], SERCOM4 PAD[3], TC5 WO[1] and I2S SCK[1].
25	PB12	bidirectional	Port B general-purpose I/O pin on VDDIO with EXTINT[12], PTC X[12], SERCOM4 PAD[0] and I2S FS[1].
26	PB13	bidirectional	Port B general-purpose I/O pin on VDDIO with EXTINT[13], PTC X[13], SERCOM4 PAD[1] and GCLK_IO[7].
27	PB14	bidirectional	Port B general-purpose I/O pin on VDDIO with EXTINT[14], PTC X[14], SERCOM4 PAD[2] and TC5 WO[0].
28	PB15	bidirectional	Port B general-purpose I/O pin on VDDIO with EXTINT[15], PTC X[15], SERCOM4 PAD[3] and TC5 WO[1].
29	PA12	bidirectional	Port A general-purpose I/O pin on VDDIO with EXTINT[12], SERCOM2/SERCOM4 PAD[0], TCC2 WO[0] and analog comparator output AC CMP[0].
30	PA13	bidirectional	Port A general-purpose I/O pin on VDDIO with EXTINT[13], SERCOM2/SERCOM4 PAD[1], TCC2 WO[1] and analog comparator output AC CMP[1].
31	PA14	bidirectional	Port A general-purpose I/O pin on VDDIO with EXTINT[14], SERCOM2/SERCOM4 PAD[2], and the XIN crystal input for XOSC.
32	PA15	bidirectional	Port A general-purpose I/O pin on VDDIO with EXTINT[15], SERCOM2/SERCOM4 PAD[3], and the XOUT crystal output for XOSC.
33	GND	power_in	Digital ground for the device.
34	VDDIO	power_in	Digital I/O supply for the port pins; the SAM D21 operating range is 1.62V to 3.63V.
35	PA16	bidirectional	Port A general-purpose I/O pin on VDDIO with EXTINT[0], PTC X[4], SERCOM1/SERCOM3 PAD[0] and TCC2 WO[0].
36	PA17	bidirectional	Port A general-purpose I/O pin on VDDIO with EXTINT[1], PTC X[5], SERCOM1/SERCOM3 PAD[1] and TCC2 WO[1].
37	PA18	bidirectional	Port A general-purpose I/O pin on VDDIO with EXTINT[2], PTC X[6], SERCOM1/SERCOM3 PAD[2] and analog comparator output AC CMP[0].
38	PA19	bidirectional	Port A general-purpose I/O pin on VDDIO with EXTINT[3], PTC X[7], SERCOM1/SERCOM3 PAD[3] and analog comparator output AC CMP[1].
39	PB16	bidirectional	Port B general-purpose I/O pin on VDDIO with EXTINT[0], SERCOM5 PAD[0], TC6 WO[0] and I2S SD[1].
40	PB17	bidirectional	Port B general-purpose I/O pin on VDDIO with EXTINT[1], SERCOM5 PAD[1], TC6 WO[1] and I2S MCK[0].
41	PA20	bidirectional	Port A general-purpose I/O pin on VDDIO with EXTINT[4], PTC X[8], SERCOM5/SERCOM3 PAD[2] and I2S SCK[0].
42	PA21	bidirectional	Port A general-purpose I/O pin on VDDIO with EXTINT[5], PTC X[9], SERCOM5/SERCOM3 PAD[3] and I2S FS[0].
43	PA22	bidirectional	Port A general-purpose I/O pin on VDDIO with EXTINT[6], PTC X[10], SERCOM3/SERCOM5 PAD[0] and TC4 WO[0].
44	PA23	bidirectional	Port A general-purpose I/O pin on VDDIO with EXTINT[7], PTC X[11], SERCOM3/SERCOM5 PAD[1] and USB SOF 1kHz.
45	PA24	bidirectional	Port A general-purpose I/O pin on VDDIO with EXTINT[12], SERCOM3/SERCOM5 PAD[2] and USB DM; the pin has no drive strength option and a pull-up is recommended if unconnected.
46	PA25	bidirectional	Port A general-purpose I/O pin on VDDIO with EXTINT[13], SERCOM3/SERCOM5 PAD[3] and USB DP; the pin has no drive strength option and a pull-up is recommended if unconnected.
47	GND	power_in	Digital ground for the device.
48	VDDIO	power_in	Digital I/O supply for the port pins; the SAM D21 operating range is 1.62V to 3.63V.
49	PB22	bidirectional	Port B general-purpose I/O pin on VDDIO with EXTINT[6], SERCOM5 PAD[2], TC7 WO[0] and TCC3 WO[0].
50	PB23	bidirectional	Port B general-purpose I/O pin on VDDIO with EXTINT[7], SERCOM5 PAD[3], TC7 WO[1] and TCC3 WO[1].
51	PA27	bidirectional	Port A general-purpose I/O pin on VDDIO with EXTINT[15], TCC3 WO[6] and GCLK_IO[0].
52	RESET	input	External reset input (active low) for the device.
53	PA28	bidirectional	Port A general-purpose I/O pin on VDDIO with EXTINT[8], TCC3 WO[7] and GCLK_IO[0].
54	GND	power_in	Digital ground for the device.
55	VDDCORE	power_out	Regulated output supply of the internal voltage regulator that feeds the core logic.
56	VDDIN	power_in	Input supply to the internal voltage regulator; the SAM D21 operating range is 1.62V to 3.63V.
57	PA30	bidirectional	Port A general-purpose I/O pin on VDDIO with EXTINT[10], SERCOM1 PAD[2], TCC1 WO[0], TCC3 WO[4], and the SWCLK debug clock.
58	PA31	bidirectional	Port A general-purpose I/O pin on VDDIO with EXTINT[11], SERCOM1 PAD[3], TCC1 WO[1], TCC3 WO[5], and the SWDIO debug data (active only with a debugger present).
59	PB30	bidirectional	Port B general-purpose I/O pin on VDDIO with EXTINT[14], SERCOM5 PAD[0], TCC0 WO[0] and TCC1 WO[2].
60	PB31	bidirectional	Port B general-purpose I/O pin on VDDIO with EXTINT[15], SERCOM5 PAD[1], TCC0 WO[1] and TCC1 WO[3].
61	PB00	bidirectional	Port B general-purpose I/O pin on VDDANA with EXTINT[0], analog input AIN[8], PTC Y[6], SERCOM5 PAD[2] and TC7 WO[0].
62	PB01	bidirectional	Port B general-purpose I/O pin on VDDANA with EXTINT[1], analog input AIN[9], PTC Y[7], SERCOM5 PAD[3] and TC7 WO[1].
63	PB02	bidirectional	Port B general-purpose I/O pin on VDDANA with EXTINT[2], analog input AIN[10], PTC Y[8], SERCOM5 PAD[0] and TC6 WO[0].
64	PB03	bidirectional	Port B general-purpose I/O pin on VDDANA with EXTINT[3], analog input AIN[11], PTC Y[9], SERCOM5 PAD[1] and TC6 WO[1].
65	EP	passive	Exposed pad (from the footprint; not named in the datasheet pin table).

Key specifications

Parameter	Value
Manufacturer	Microchip Tech
Package	QFN-64-EP(9x9)
Category	Embedded Processors & Controllers
Pins	65

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.	859

CAD (KiCad official)

Symbol: ATSAMD21J17A-MU
Footprint: Package_DFN_QFN:QFN-64-1EP_9x9mm_P0.5mm_EP6x6mm
3D model: QFN-64-EP(9x9) (KiCad packages3D, STEP)
3D model files: atsamd21j17a-mu-etched.step / atsamd21j17a-mu-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); atsamd21j17a-mu.step / atsamd21j17a-mu.glb are the bare package body.

Provenance

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

Datasheet: Microchip Tech datasheet (1148 pp, sha256 18ca1ccab5aa330f, retrieved 2026-10-28, tier: manufacturer)
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