ATSAMD21G18A-MU

@@ -0,0 +1,99 @@+# ATSAMD21G18A-MU++**Microchip** · Microcontrollers (MCU/MPU/SOC) · QFN-48-EP(7x7)++ATSAMD21G18A-MU from Microchip, in a QFN-48-EP(7x7). Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | PA00 | bidirectional | Port A GPIO. Muxed: EXTINT[0], SERCOM1/PAD[0] (USART/SPI/I2C), TCC2/WO[0]. Powered from VDDANA. |+| 2 | PA01 | bidirectional | Port A GPIO. Muxed: EXTINT[1], SERCOM1/PAD[1], TCC2/WO[1]. Powered from VDDANA. |+| 3 | PA02 | bidirectional | Port A GPIO. Muxed: EXTINT[2], ADC AIN[0], PTC Y[0], DAC VOUT, TCC3/WO[0]. Powered from VDDANA. |+| 4 | PA03 | bidirectional | Port A GPIO. Muxed: EXTINT[3], ADC/DAC VREFA input, ADC AIN[1], PTC Y[1], TCC3/WO[1]. Powered from VDDANA. |+| 5 | GNDANA | power_in | Analog ground return for VDDANA supply and the internal analog blocks (ADC, DAC, AC, references). |+| 6 | VDDANA | power_in | Analog supply, 1.62-3.63 V. Powers the ADC, DAC, analog comparators, references, and the VDDANA-domain PORT pins. Must be decoupled and typically tied to VDDIN. |+| 7 | PB08 | bidirectional | Port B GPIO. Muxed: EXTINT[8], ADC AIN[2], PTC Y[14], SERCOM4/PAD[0], TC4/WO[0], TCC3/WO[6]. Powered from VDDANA. |+| 8 | PB09 | bidirectional | Port B GPIO. Muxed: EXTINT[9], ADC AIN[3], PTC Y[15], SERCOM4/PAD[1], TC4/WO[1], TCC3/WO[7]. Powered from VDDANA. |+| 9 | PA04 | bidirectional | Port A GPIO. Muxed: EXTINT[4], ADC/VREFB input, ADC AIN[4], AC AIN[0], PTC Y[2], SERCOM0/PAD[0], TCC0/WO[0], TCC3/WO[2]. Powered from VDDANA. |+| 10 | PA05 | bidirectional | Port A GPIO. Muxed: EXTINT[5], ADC AIN[5], AC AIN[1], PTC Y[3], SERCOM0/PAD[1], TCC0/WO[1], TCC3/WO[3]. Powered from VDDANA. |+| 11 | PA06 | bidirectional | Port A GPIO. Muxed: EXTINT[6], ADC AIN[6], AC AIN[2], PTC Y[4], SERCOM0/PAD[2], TCC1/WO[0], TCC3/WO[4]. Powered from VDDANA. |+| 12 | PA07 | bidirectional | Port A GPIO. Muxed: EXTINT[7], ADC AIN[7], AC AIN[3], PTC Y[5], SERCOM0/PAD[3], TCC1/WO[1], TCC3/WO[5], I2S/SD[0]. Powered from VDDANA. |+| 13 | PA08 | bidirectional | Port A GPIO. Muxed: NMI, ADC AIN[16], PTC X[0], SERCOM0/PAD[0], SERCOM2/PAD[0], TCC0/WO[0], TCC1/WO[2], I2S/SD[1]. Powered from VDDIO. |+| 14 | PA09 | bidirectional | Port A GPIO. Muxed: EXTINT[9], ADC AIN[17], PTC X[1], SERCOM0/PAD[1], SERCOM2/PAD[1], TCC0/WO[1], TCC1/WO[3], I2S/MCK[0]. Powered from VDDIO. |+| 15 | PA10 | bidirectional | Port A GPIO. Muxed: EXTINT[10], ADC AIN[18], PTC X[2], SERCOM0/PAD[2], SERCOM2/PAD[2], TCC1/WO[0], TCC0/WO[2], I2S/SCK[0], GCLK_IO[4]. Powered from VDDIO. |+| 16 | PA11 | bidirectional | Port A GPIO. Muxed: EXTINT[11], ADC AIN[19], PTC X[3], SERCOM0/PAD[3], SERCOM2/PAD[3], TCC1/WO[1], TCC0/WO[3], I2S/FS[0], GCLK_IO[5]. Powered from VDDIO. |+| 17 | VDDIO | power_in | Digital I/O supply, 1.62-3.63 V. Powers the VDDIO-domain PORT pins. Must be decoupled locally. |+| 18 | GND | power_in | Digital ground return for the VDDIO and VDDCORE domains. |+| 19 | PB10 | bidirectional | Port B GPIO. Muxed: EXTINT[10], SERCOM4/PAD[2], TC5/WO[0], TCC0/WO[4], I2S/MCK[1], GCLK_IO[4]. Powered from VDDIO. |+| 20 | PB11 | bidirectional | Port B GPIO. Muxed: EXTINT[11], SERCOM4/PAD[3], TC5/WO[1], TCC0/WO[5], I2S/SCK[1], GCLK_IO[5]. Powered from VDDIO. |+| 21 | PA12 | bidirectional | Port A GPIO. Muxed: EXTINT[12], SERCOM2/PAD[0], SERCOM4/PAD[0], TCC2/WO[0], TCC0/WO[6], AC/CMP[0]. Powered from VDDIO. |+| 22 | PA13 | bidirectional | Port A GPIO. Muxed: EXTINT[13], SERCOM2/PAD[1], SERCOM4/PAD[1], TCC2/WO[1], TCC0/WO[7], AC/CMP[1]. Powered from VDDIO. |+| 23 | PA14 | bidirectional | Port A GPIO. Muxed: EXTINT[14], SERCOM2/PAD[2], SERCOM4/PAD[2], TC3/WO[0], TCC0/WO[4], GCLK_IO[0]. Powered from VDDIO. |+| 24 | PA15 | bidirectional | Port A GPIO. Muxed: EXTINT[15], SERCOM2/PAD[3], SERCOM4/PAD[3], TC3/WO[1], TCC0/WO[5], GCLK_IO[1]. Powered from VDDIO. |+| 25 | PA16 | bidirectional | Port A GPIO. Muxed: EXTINT[0], PTC X[4], SERCOM1/PAD[0], SERCOM3/PAD[0], TCC2/WO[0], TCC0/WO[6], GCLK_IO[2]. Powered from VDDIO. |+| 26 | PA17 | bidirectional | Port A GPIO. Muxed: EXTINT[1], PTC X[5], SERCOM1/PAD[1], SERCOM3/PAD[1], TCC2/WO[1], TCC0/WO[7], GCLK_IO[3]. Powered from VDDIO. |+| 27 | PA18 | bidirectional | Port A GPIO. Muxed: EXTINT[2], PTC X[6], SERCOM1/PAD[2], SERCOM3/PAD[2], TC3/WO[0], TCC0/WO[2], AC/CMP[0]. Powered from VDDIO. |+| 28 | PA19 | bidirectional | Port A GPIO. Muxed: EXTINT[3], PTC X[7], SERCOM1/PAD[3], SERCOM3/PAD[3], TC3/WO[1], TCC0/WO[3], I2S/SD[0], AC/CMP[1]. Powered from VDDIO. |+| 29 | PA20 | bidirectional | Port A GPIO. Muxed: EXTINT[4], PTC X[8], SERCOM5/PAD[2], SERCOM3/PAD[2], TC7/WO[0], TCC0/WO[6], I2S/SCK[0], GCLK_IO[4]. Powered from VDDIO. |+| 30 | PA21 | bidirectional | Port A GPIO. Muxed: EXTINT[5], PTC X[9], SERCOM5/PAD[3], SERCOM3/PAD[3], TC7/WO[1], TCC0/WO[7], I2S/FS[0], GCLK_IO[5]. Powered from VDDIO. |+| 31 | PA22 | bidirectional | Port A GPIO. Muxed: EXTINT[6], PTC X[10], SERCOM3/PAD[0], SERCOM5/PAD[0], TC4/WO[0], TCC0/WO[4], GCLK_IO[6]. Powered from VDDIO. |+| 32 | PA23 | bidirectional | Port A GPIO. Muxed: EXTINT[7], PTC X[11], SERCOM3/PAD[1], SERCOM5/PAD[1], TC4/WO[1], TCC0/WO[5], USB/SOF 1kHz, GCLK_IO[7]. Powered from VDDIO. |+| 33 | PA24 | bidirectional | USB D- (USB/DM) by default. Alternate: EXTINT[12], SERCOM3/PAD[2], SERCOM5/PAD[2], TC5/WO[0], TCC1/WO[2]. Enable pull-up in input GPIO mode if unused. Powered from VDDIO. |+| 34 | PA25 | bidirectional | USB D+ (USB/DP) by default. Alternate: EXTINT[13], SERCOM3/PAD[3], SERCOM5/PAD[3], TC5/WO[1], TCC1/WO[3]. Enable pull-up in input GPIO mode if unused. Powered from VDDIO. |+| 35 | GND | power_in | Digital ground return for the VDDIO and VDDCORE domains. |+| 36 | VDDIO | power_in | Digital I/O supply, 1.62-3.63 V. Powers the VDDIO-domain PORT pins. Must be decoupled locally. |+| 37 | PB22 | bidirectional | Port B GPIO. Muxed: EXTINT[6], SERCOM5/PAD[2], TC7/WO[0], TCC3/WO[0], GCLK_IO[0]. Powered from VDDIO. |+| 38 | PB23 | bidirectional | Port B GPIO. Muxed: EXTINT[7], SERCOM5/PAD[3], TC7/WO[1], TCC3/WO[1], GCLK_IO[1]. Powered from VDDIO. |+| 39 | PA27 | bidirectional | Port A GPIO. Muxed: EXTINT[15], TCC3/WO[6], GCLK_IO[0]. Powered from VDDIO. |+| 40 | RESET | input | Active-low reset input. Internal pull-up; drive low to reset the device. |+| 41 | PA28 | bidirectional | Port A GPIO. Muxed: EXTINT[8], TCC3/WO[7], GCLK_IO[0]. Powered from VDDIO. |+| 42 | VDDCORE | power_out | 1.2 V internal regulator output for the core. Decouple externally (typically 1 uF ceramic to GND). Do not drive from an external source. |+| 43 | VDDIN | power_in | Main supply input to the on-chip voltage regulator, 1.62-3.63 V. Decouple locally; typically tied to VDDIO/VDDANA. |+| 44 | GND | power_in | Digital ground return for the regulator (VDDIN/VDDCORE) domain. |+| 45 | PA30 | bidirectional | SWCLK (Serial Wire Debug clock) by default in the presence of a debugger. Alternate: EXTINT[10], SERCOM1/PAD[2], TCC1/WO[0], TCC3/WO[4], GCLK_IO[0]. Powered from VDDIO. |+| 46 | PA31 | bidirectional | SWDIO (Serial Wire Debug data I/O) - activated in the presence of a debugger. Alternate: EXTINT[11], SERCOM1/PAD[3], TCC1/WO[1], TCC3/WO[5]. Powered from VDDIO. |+| 47 | PB02 | bidirectional | Port B GPIO. Muxed: EXTINT[2], ADC AIN[10], PTC Y[8], SERCOM5/PAD[0], TC6/WO[0], TCC3/WO[2]. Powered from VDDANA. |+| 48 | PB03 | bidirectional | Port B GPIO. Muxed: EXTINT[3], ADC AIN[11], PTC Y[9], SERCOM5/PAD[1], TC6/WO[1], TCC3/WO[3]. Powered from VDDANA. |+| EP | GND | power_in | Exposed thermal pad on the QFN package underside. Must be soldered to the PCB ground plane for thermal and electrical performance. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Microchip |+| Package | QFN-48-EP(7x7) |+| Category | MCU |+| Pins | 49 |++## Ordering variants++- `ATSAMD21G18A-MU`+- `ATSAMD21G18A-MUT`+- `ATSAMD21G18A-MUAU`+- `ATSAMD21G18A-MUAUT`+- `ATSAMD21G18A-MUMZ`+- `ATSAMD21G18A-MUMZT`+- `ATSAMD21G18A-MUAZ`+- `ATSAMD21G18A-MUAZT`+- `ATSAMD21G18A-MUAF`+- `ATSAMD21G18A-MUAFT`+- `ATSAMD21G18A-MUMF`+- `ATSAMD21G18A-MUMFT`++## CAD (KiCad official)++- Symbol: `ATSAMD21G18A-MU`+- Footprint: `Package_DFN_QFN:QFN-48-1EP_7x7mm_P0.5mm_EP5.15x5.15mm`+- 3D model: QFN-48-EP(7x7) (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Microchip datasheet](docs/atsamd21g18a-mu-datasheet.pdf) (1115 pp, sha256 `3aaa8a6575530d72`, retrieved 2026-08-17, tier: lcsc)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/atsamd21g18a-mu-datasheet.pdf)