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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 (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