ATMEGA8A-AU

@@ -0,0 +1,80 @@+# ATMEGA8A-AU++**Microchip** · Microcontrollers (MCU/MPU/SOC) · TQFP-32(7x7)++ATMEGA8A-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/INT1 | bidirectional | Port D bit 3, bi-directional I/O with programmable internal pull-up. Alternate function: INT1 external interrupt input. |+| 2 | PD4/XCK/T0 | bidirectional | Port D bit 4, bi-directional I/O with programmable internal pull-up. Alternates: USART external clock (XCK) and Timer/Counter0 external clock input (T0). |+| 3 | GND | power_in | Digital ground reference (0V). |+| 4 | VCC | power_in | Digital supply voltage, 2.7-5.5V. |+| 5 | GND | power_in | Digital ground reference (0V). |+| 6 | VCC | power_in | Digital supply voltage, 2.7-5.5V. |+| 7 | PB6/XTAL1/TOSC1 | bidirectional | Port B bit 6, bi-directional I/O with internal pull-up. Alternates: XTAL1 crystal oscillator input (and internal clock circuit input); TOSC1 asynchronous Timer/Counter2 oscillator input when AS2 bit set. |+| 8 | PB7/XTAL2/TOSC2 | bidirectional | Port B bit 7, bi-directional I/O with internal pull-up. Alternates: XTAL2 crystal oscillator output (inverting amplifier); TOSC2 asynchronous Timer/Counter2 oscillator when AS2 bit set. |+| 9 | PD5/T1 | bidirectional | Port D bit 5, bi-directional I/O with internal pull-up. Alternate: Timer/Counter1 external clock input (T1). |+| 10 | PD6/AIN0 | bidirectional | Port D bit 6, bi-directional I/O with internal pull-up. Alternate: analog comparator positive input (AIN0). |+| 11 | PD7/AIN1 | bidirectional | Port D bit 7, bi-directional I/O with internal pull-up. Alternate: analog comparator negative input (AIN1). |+| 12 | PB0/ICP1 | bidirectional | Port B bit 0, bi-directional I/O with internal pull-up. Alternate: Timer/Counter1 input capture (ICP1). |+| 13 | PB1/OC1A | bidirectional | Port B bit 1, bi-directional I/O with internal pull-up. Alternate: Timer/Counter1 output compare A (OC1A) PWM output. |+| 14 | PB2/SS/OC1B | bidirectional | Port B bit 2, bi-directional I/O with internal pull-up. Alternates: SPI slave select (SS, active low); Timer/Counter1 output compare B (OC1B) PWM output. |+| 15 | PB3/MOSI/OC2 | bidirectional | Port B bit 3, bi-directional I/O with internal pull-up. Alternates: SPI Master Out / Slave In data (MOSI, also used for ISP programming); Timer/Counter2 output compare (OC2) PWM output. |+| 16 | PB4/MISO | bidirectional | Port B bit 4, bi-directional I/O with internal pull-up. Alternate: SPI Master In / Slave Out data (MISO, also used for ISP programming readback). |+| 17 | PB5/SCK | bidirectional | Port B bit 5, bi-directional I/O with internal pull-up. Alternate: SPI serial clock (SCK, also used for ISP programming). |+| 18 | AVCC | power_in | Analog supply voltage for the A/D Converter, Port C[3:0], and ADC[7:6]. Must be connected externally to VCC (through low-pass filter if ADC is used). |+| 19 | ADC6 | input | Dedicated analog input channel 6 to the 10-bit ADC (TQFP/QFN only). Powered from analog supply (AVCC). |+| 20 | AREF | passive | Analog reference input for the A/D Converter. Typically decoupled with capacitor to AGND. |+| 21 | GND | power_in | Analog ground reference (0V); shared/tied to digital GND. |+| 22 | ADC7 | input | Dedicated analog input channel 7 to the 10-bit ADC (TQFP/QFN only). Powered from analog supply (AVCC). |+| 23 | PC0/ADC0 | bidirectional | Port C bit 0, bi-directional I/O with internal pull-up. Alternate: ADC channel 0 analog input. |+| 24 | PC1/ADC1 | bidirectional | Port C bit 1, bi-directional I/O with internal pull-up. Alternate: ADC channel 1 analog input. |+| 25 | PC2/ADC2 | bidirectional | Port C bit 2, bi-directional I/O with internal pull-up. Alternate: ADC channel 2 analog input. |+| 26 | PC3/ADC3 | bidirectional | Port C bit 3, bi-directional I/O with internal pull-up. Alternate: ADC channel 3 analog input. |+| 27 | PC4/ADC4/SDA | bidirectional | Port C bit 4, bi-directional I/O with internal pull-up. Alternates: ADC channel 4 analog input; TWI (I2C-compatible) serial data (SDA) - open-drain when TWEN set. |+| 28 | PC5/ADC5/SCL | bidirectional | Port C bit 5, bi-directional I/O with internal pull-up. Alternates: ADC channel 5 analog input; TWI (I2C-compatible) serial clock (SCL) - open-drain when TWEN set. |+| 29 | PC6/RESET | input | Reset input (active low) by default; a low level longer than the minimum pulse length generates a reset even when the clock is not running. If the RSTDISBL fuse is programmed, PC6 becomes a general-purpose I/O with reduced drive. |+| 30 | PD0/RXD | bidirectional | Port D bit 0, bi-directional I/O with internal pull-up. Alternate: USART receive data input (RXD). |+| 31 | PD1/TXD | bidirectional | Port D bit 1, bi-directional I/O with internal pull-up. Alternate: USART transmit data output (TXD). |+| 32 | PD2/INT0 | bidirectional | Port D bit 2, bi-directional I/O with internal pull-up. Alternate: INT0 external interrupt input. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Microchip |+| Package | TQFP-32(7x7) |+| Category | MCU |+| Pins | 32 |++## Ordering variants++- `ATMEGA8A-AUAU`+- `ATMEGA8A-AUAUR`+- `ATMEGA8A-AUAN`+- `ATMEGA8A-AUANR`+- `ATMEGA8A-AUMU`+- `ATMEGA8A-AUMUR`+- `ATMEGA8A-AUMN`+- `ATMEGA8A-AUMNR`+- `ATMEGA8A-AUPU`+- `ATMEGA8A-AUPN`++## CAD (KiCad official)++- Symbol: `ATMEGA8A-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/atmega8a-au-datasheet.pdf) (13 pp, sha256 `95842cde9bc8cdd0`, 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/atmega8a-au-datasheet.pdf)