ATMEGA168PA-AU

@@ -0,0 +1,77 @@+# ATMEGA168PA-AU++**Microchip** · Microcontrollers (MCU/MPU/SOC) · TQFP-32(7x7)++ATMEGA168PA-AU from Microchip, in a TQFP-32(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 | PD3/PCINT19/OC2B/INT1 | bidirectional | Port D bit 3 GPIO with internal pull-up. Alternate: External interrupt INT1, Timer/Counter2 output compare match B (OC2B), pin-change interrupt PCINT19. |+| 2 | PD4/PCINT20/XCK/T0 | bidirectional | Port D bit 4 GPIO with internal pull-up. Alternate: USART external clock (XCK), Timer/Counter0 external counter input (T0), pin-change interrupt PCINT20. |+| 3 | GND | power_in | Digital ground reference (0V). |+| 4 | VCC | power_in | Digital supply voltage, 1.8V to 5.5V. |+| 5 | GND | power_in | Digital ground reference (0V). |+| 6 | VCC | power_in | Digital supply voltage, 1.8V to 5.5V. |+| 7 | PB6/PCINT6/XTAL1/TOSC1 | bidirectional | Port B bit 6 GPIO. Alternate: crystal oscillator input (XTAL1) or Timer/Counter2 async oscillator input (TOSC1); pin-change interrupt PCINT6. |+| 8 | PB7/PCINT7/XTAL2/TOSC2 | bidirectional | Port B bit 7 GPIO. Alternate: crystal oscillator output (XTAL2) or Timer/Counter2 async oscillator output (TOSC2); pin-change interrupt PCINT7. |+| 9 | PD5/PCINT21/OC0B/T1 | bidirectional | Port D bit 5 GPIO. Alternate: Timer/Counter0 output compare B (OC0B), Timer/Counter1 external counter input (T1), pin-change interrupt PCINT21. |+| 10 | PD6/PCINT22/OC0A/AIN0 | bidirectional | Port D bit 6 GPIO. Alternate: Timer/Counter0 output compare A (OC0A), analog comparator positive input (AIN0), pin-change interrupt PCINT22. |+| 11 | PD7/PCINT23/AIN1 | bidirectional | Port D bit 7 GPIO. Alternate: analog comparator negative input (AIN1), pin-change interrupt PCINT23. |+| 12 | PB0/PCINT0/CLKO/ICP1 | bidirectional | Port B bit 0 GPIO. Alternate: divided system clock output (CLKO), Timer/Counter1 input capture (ICP1), pin-change interrupt PCINT0. |+| 13 | PB1/PCINT1/OC1A | bidirectional | Port B bit 1 GPIO. Alternate: Timer/Counter1 output compare A (OC1A) PWM, pin-change interrupt PCINT1. |+| 14 | PB2/PCINT2/SS/OC1B | bidirectional | Port B bit 2 GPIO. Alternate: SPI slave select (SS, active low), Timer/Counter1 output compare B (OC1B), pin-change interrupt PCINT2. |+| 15 | PB3/PCINT3/OC2A/MOSI | bidirectional | Port B bit 3 GPIO. Alternate: SPI master-out/slave-in (MOSI), Timer/Counter2 output compare A (OC2A), pin-change interrupt PCINT3. |+| 16 | PB4/PCINT4/MISO | bidirectional | Port B bit 4 GPIO. Alternate: SPI master-in/slave-out (MISO), pin-change interrupt PCINT4. |+| 17 | PB5/SCK/PCINT5 | bidirectional | Port B bit 5 GPIO. Alternate: SPI serial clock (SCK), pin-change interrupt PCINT5. Also ISP programming clock. |+| 18 | AVCC | power_in | Analog supply pin for the A/D converter, PC3:0, and ADC7:6. Must be externally connected to VCC (through a low-pass filter if ADC is used) even if the ADC is not used. |+| 19 | ADC6 | input | 10-bit analog input channel 6 to the A/D converter. Powered from AVCC. Available only in TQFP and QFN/MLF packages. |+| 20 | AREF | passive | Analog reference voltage input for the A/D converter. |+| 21 | GND | power_in | Digital ground reference (0V). |+| 22 | ADC7 | input | 10-bit analog input channel 7 to the A/D converter. Powered from AVCC. Available only in TQFP and QFN/MLF packages. |+| 23 | PC0/ADC0/PCINT8 | bidirectional | Port C bit 0 GPIO. Alternate: ADC channel 0 input (ADC0), pin-change interrupt PCINT8. |+| 24 | PC1/ADC1/PCINT9 | bidirectional | Port C bit 1 GPIO. Alternate: ADC channel 1 input (ADC1), pin-change interrupt PCINT9. |+| 25 | PC2/ADC2/PCINT10 | bidirectional | Port C bit 2 GPIO. Alternate: ADC channel 2 input (ADC2), pin-change interrupt PCINT10. |+| 26 | PC3/ADC3/PCINT11 | bidirectional | Port C bit 3 GPIO. Alternate: ADC channel 3 input (ADC3), pin-change interrupt PCINT11. |+| 27 | PC4/ADC4/SDA/PCINT12 | bidirectional | Port C bit 4 GPIO. Alternate: ADC channel 4 input (ADC4), TWI (I2C) data line (SDA, open-drain), pin-change interrupt PCINT12. |+| 28 | PC5/ADC5/SCL/PCINT13 | bidirectional | Port C bit 5 GPIO. Alternate: ADC channel 5 input (ADC5), TWI (I2C) clock line (SCL, open-drain), pin-change interrupt PCINT13. |+| 29 | PC6/RESET/PCINT14 | input | Reset input (active-low): a low level longer than the minimum pulse width generates a reset even if the clock is not running. When the RSTDISBL fuse is programmed, this pin becomes GPIO PC6 with weaker drive characteristics than other Port C pins. |+| 30 | PD0/RXD/PCINT16 | bidirectional | Port D bit 0 GPIO. Alternate: USART receive data input (RXD), pin-change interrupt PCINT16. |+| 31 | PD1/TXD/PCINT17 | bidirectional | Port D bit 1 GPIO. Alternate: USART transmit data output (TXD), pin-change interrupt PCINT17. |+| 32 | PD2/INT0/PCINT18 | bidirectional | Port D bit 2 GPIO. Alternate: external interrupt INT0, pin-change interrupt PCINT18. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Microchip |+| Package | TQFP-32(7x7) |+| Category | MCU |+| Pins | 32 |++## Ordering variants++- `ATMEGA168PA-AUAU`+- `ATMEGA168PA-AUAUR`+- `ATMEGA168PA-AUMU`+- `ATMEGA168PA-AUMUR`+- `ATMEGA168PA-AUPU`+- `ATMEGA168PA-AUMMH`+- `ATMEGA168PA-AUCU`++## CAD (KiCad official)++- Symbol: `ATMEGA168PA-AU`+- Footprint: `Package_QFP:LQFP-32_7x7mm_P0.8mm`+- 3D model: TQFP-32(7x7) (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Microchip datasheet](docs/atmega168pa-au-datasheet.pdf) (31 pp, sha256 `194fdd0f35c63d3b`, retrieved 2026-08-17, tier: manufacturer)+- **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/atmega168pa-au-datasheet.pdf)

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