# AT90PWM3B-16MU

**Microchip Tech** · ATMEL & AVR · QFN-32-EP(7x7)

AT90PWM3B-16MU from Microchip Tech, in a QFN-32-EP(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 | PD2 | bidirectional | Port D bit 2, also PSCIN2 digital input, OC1A, and MISO_A alternate SPI function. |
| 2 | PD3 | bidirectional | Port D bit 3, also TXD DALI/UART transmit data, OC0A, SS and MOSI_A alternate functions. |
| 3 | PC1 | bidirectional | Port C bit 1, also PSCIN1 digital input and OC1B Timer 1 output compare B. |
| 4 | VCC | power_in | Digital supply voltage pin for the device (2.7V to 5.5V operating voltage). |
| 5 | GND | power_in | Ground, 0V reference for the device. |
| 6 | PC2 | bidirectional | Port C bit 2, also T0 Timer 0 clock input and PSCOUT22 output. |
| 7 | PC3 | bidirectional | Port C bit 3, also T1 Timer 1 clock input and PSCOUT23 output. |
| 8 | PB0 | bidirectional | Port B bit 0, also MISO SPI master in slave out and PSCOUT20 output. |
| 9 | PB1 | bidirectional | Port B bit 1, also MOSI SPI master out slave in and PSCOUT21 output. |
| 10 | PE1 | bidirectional | Port E bit 1, also XTAL1 crystal/clock input to the inverting oscillator amplifier and OC0B Timer 0 output compare B. |
| 11 | PE2 | bidirectional | Port E bit 2, also XTAL2 oscillator amplifier output and ADC0 analog input channel 0. |
| 12 | PD4 | bidirectional | Port D bit 4, also ADC1 analog input, RXD DALI/UART receive data, ICP1A and SCK_A alternate function. |
| 13 | PD5 | bidirectional | Port D bit 5, also ADC2 analog input and ACMP2 analog comparator 2 positive input. |
| 14 | PD6 | bidirectional | Port D bit 6, also ADC3 analog input, ACMPM analog comparator reference, and INT0 external interrupt. |
| 15 | PD7 | bidirectional | Port D bit 7, also ACMP0 analog comparator 0 positive input. |
| 16 | PB2 | bidirectional | Port B bit 2, also ADC5 analog input channel 5 and INT1 external interrupt. |
| 17 | PC4 | bidirectional | Port C bit 4, also ADC8 analog input channel 8 and AMP1- differential amplifier 1 negative input. |
| 18 | PC5 | bidirectional | Port C bit 5, also ADC9 analog input channel 9 and AMP1+ differential amplifier 1 positive input. |
| 19 | AVCC | power_in | Analog supply voltage for the ADC, which should be connected to VCC even when the ADC is not used. |
| 20 | AGND | power_in | Analog ground, 0V reference for the analog part. |
| 21 | AREF | power_in | Analog reference pin for the A/D converter, which can also be used as an output for external analog circuitry. |
| 22 | PC6 | bidirectional | Port C bit 6, also ADC10 analog input channel 10 and ACMP1 analog comparator 1 positive input. |
| 23 | PB3 | bidirectional | Port B bit 3, also AMP0- differential amplifier 0 negative input channel. |
| 24 | PB4 | bidirectional | Port B bit 4, also AMP0+ differential amplifier 0 positive input channel. |
| 25 | PC7 | bidirectional | Port C bit 7, also D2A DAC output. |
| 26 | PB5 | bidirectional | Port B bit 5, also ADC6 analog input channel 6 and INT2 external interrupt. |
| 27 | PB6 | bidirectional | Port B bit 6, also ADC7 analog input channel 7, ICP1B Timer 1 input capture alternate input, and PSCOUT11 output. |
| 28 | PB7 | bidirectional | Port B bit 7, also ADC4 analog input channel 4, PSCOUT01 output, and SCK SPI clock. |
| 29 | PD0 | bidirectional | Port D bit 0, also PSCOUT00 output, XCK UART transfer clock, and SS_A alternate SPI slave select. |
| 30 | PC0 | bidirectional | Port C bit 0, also PSCOUT10 output and INT3 external interrupt. |
| 31 | PE0 | bidirectional | Port E bit 0, which is RESET input when the RSTDISBL fuse is unprogrammed, and a low pulse longer than the minimum length generates a reset; it is also OCD on-chip debug I/O. |
| 32 | PD1 | bidirectional | Port D bit 1, also PSCIN0 digital input and CLKO system clock output. |
| 33 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | QFN-32-EP(7x7) |
| Category | Embedded Processors & Controllers |
| Pins | 33 |

## 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 voltage |  | 2.7 |  | 5.5 | V |  | 2 |
| Extended operating temperature |  | -40 |  | 105 | °C | Extended operating range | 2 |

## CAD (KiCad official)

- Symbol: `AT90PWM3B-16MU`
- Footprint: `Package_DFN_QFN:QFN-32-1EP_7x7mm_P0.65mm_EP4.7x4.7mm`
- 3D model: QFN-32-EP(7x7) (KiCad packages3D, STEP)
- 3D model files: `at90pwm3b-16mu-etched.step` / `at90pwm3b-16mu-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `at90pwm3b-16mu.step` / `at90pwm3b-16mu.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Microchip Tech datasheet](docs/at90pwm3b-16mu-datasheet.pdf) (25 pp, sha256 `a17c3c1e353ab729`, 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](docs/at90pwm3b-16mu-datasheet.pdf)