ATMEGA16A-AU

@@ -0,0 +1,87 @@+# ATMEGA16A-AU++**Microchip** · Microcontrollers (MCU/MPU/SOC) · TQFP-44(10x10)++ATMEGA16A-AU from Microchip, in a TQFP-44(10x10). 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 | PB5/MOSI | bidirectional | Port B bit 5. Alternate function: SPI bus Master-Out-Slave-In. Also serves as slave data input during serial programming. |+| 2 | PB6/MISO | bidirectional | Port B bit 6. Alternate function: SPI bus Master-In-Slave-Out. Also serves as slave data output during serial programming. |+| 3 | PB7/SCK | bidirectional | Port B bit 7. Alternate function: SPI bus serial clock. Also serves as clock during serial programming. |+| 4 | RESET | input | Active-low external reset input. A low level longer than the minimum pulse (see datasheet spec) generates a reset even if the clock is not running. |+| 5 | VCC | power_in | Digital supply voltage, 2.7-5.5 V. |+| 6 | GND | power_in | Ground reference (0 V). |+| 7 | XTAL2 | output | Output from the inverting oscillator amplifier. Connect to the far side of an external crystal/resonator across XTAL1-XTAL2. |+| 8 | XTAL1 | input | Input to the inverting oscillator amplifier and internal clock operating circuit. Also the external clock input when using an external clock source. |+| 9 | PD0/RXD | bidirectional | Port D bit 0. Alternate function: USART receive data input. |+| 10 | PD1/TXD | bidirectional | Port D bit 1. Alternate function: USART transmit data output. |+| 11 | PD2/INT0 | bidirectional | Port D bit 2. Alternate function: External interrupt source 0 (INT0). |+| 12 | PD3/INT1 | bidirectional | Port D bit 3. Alternate function: External interrupt source 1 (INT1). |+| 13 | PD4/OC1B | bidirectional | Port D bit 4. Alternate function: Timer/Counter1 Output Compare B match output (OC1B), typically used for PWM. |+| 14 | PD5/OC1A | bidirectional | Port D bit 5. Alternate function: Timer/Counter1 Output Compare A match output (OC1A), typically used for PWM. |+| 15 | PD6/ICP1 | bidirectional | Port D bit 6. Alternate function: Timer/Counter1 Input Capture pin (ICP1). |+| 16 | PD7/OC2 | bidirectional | Port D bit 7. Alternate function: Timer/Counter2 Output Compare match output (OC2), typically used for PWM. |+| 17 | VCC | power_in | Digital supply voltage (second VCC pin on TQFP package). Bypass locally with 100 nF. |+| 18 | GND | power_in | Ground reference (second GND pin on TQFP package). |+| 19 | PC0/SCL | bidirectional | Port C bit 0. Alternate function: Two-wire Serial Interface clock line (SCL). Requires an external pull-up resistor when used as TWI. |+| 20 | PC1/SDA | bidirectional | Port C bit 1. Alternate function: Two-wire Serial Interface data line (SDA). Requires an external pull-up resistor when used as TWI. |+| 21 | PC2/TCK | bidirectional | Port C bit 2. Alternate function: JTAG Test Clock (TCK). Held by JTAG when the JTAGEN fuse is programmed. |+| 22 | PC3/TMS | bidirectional | Port C bit 3. Alternate function: JTAG Test Mode Select (TMS). |+| 23 | PC4/TDO | bidirectional | Port C bit 4. Alternate function: JTAG Test Data Out (TDO). |+| 24 | PC5/TDI | bidirectional | Port C bit 5. Alternate function: JTAG Test Data In (TDI). |+| 25 | PC6/TOSC1 | bidirectional | Port C bit 6. Alternate function: Timer Oscillator pin 1 (TOSC1) for the asynchronous Timer/Counter2 when driven by an external 32.768 kHz watch crystal. |+| 26 | PC7/TOSC2 | bidirectional | Port C bit 7. Alternate function: Timer Oscillator pin 2 (TOSC2) for the asynchronous Timer/Counter2. |+| 27 | AVCC | power_in | Analog supply pin for Port A and the ADC. Should be connected to VCC through a filter (typically an LC network) even when the ADC is not used; must not differ from VCC by more than ±0.3 V. |+| 28 | GND | power_in | Ground reference (analog GND on TQFP package). |+| 29 | AREF | passive | Analog reference input pin for the A/D converter. Decouple with a capacitor to GND (typically 100 nF); may be driven externally or configured internally. |+| 30 | PA7/ADC7 | bidirectional | Port A bit 7 / ADC channel 7 input. When the ADC is enabled the pin operates as an analog input; otherwise it is a general-purpose digital I/O. |+| 31 | PA6/ADC6 | bidirectional | Port A bit 6 / ADC channel 6 input. |+| 32 | PA5/ADC5 | bidirectional | Port A bit 5 / ADC channel 5 input. |+| 33 | PA4/ADC4 | bidirectional | Port A bit 4 / ADC channel 4 input. |+| 34 | PA3/ADC3 | bidirectional | Port A bit 3 / ADC channel 3 input. |+| 35 | PA2/ADC2 | bidirectional | Port A bit 2 / ADC channel 2 input. |+| 36 | PA1/ADC1 | bidirectional | Port A bit 1 / ADC channel 1 input. |+| 37 | PA0/ADC0 | bidirectional | Port A bit 0 / ADC channel 0 input. |+| 38 | VCC | power_in | Digital supply voltage (third VCC pin on TQFP package). |+| 39 | GND | power_in | Ground reference (third GND pin on TQFP package). |+| 40 | PB0/XCK/T0 | bidirectional | Port B bit 0. Alternate functions: USART external clock (XCK) and Timer/Counter0 external clock input (T0). |+| 41 | PB1/T1 | bidirectional | Port B bit 1. Alternate function: Timer/Counter1 external clock input (T1). |+| 42 | PB2/AIN0/INT2 | bidirectional | Port B bit 2. Alternate functions: Analog comparator positive input (AIN0) and external interrupt source 2 (INT2). |+| 43 | PB3/AIN1/OC0 | bidirectional | Port B bit 3. Alternate functions: Analog comparator negative input (AIN1) and Timer/Counter0 Output Compare match output (OC0), typically used for PWM. |+| 44 | PB4/SS | bidirectional | Port B bit 4. Alternate function: SPI slave select input (SS, active low). Must be held high when the SPI is configured as master unless driven as an output. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Microchip |+| Package | TQFP-44(10x10) |+| Category | MCU |+| Pins | 44 |++## Ordering variants++- `ATMEGA16A-AUAU`+- `ATMEGA16A-AUAUR`+- `ATMEGA16A-AUPU`+- `ATMEGA16A-AUMU`+- `ATMEGA16A-AUMUR`++## CAD (KiCad official)++- Symbol: `ATMEGA16A-AU`+- Footprint: `Package_QFP:LQFP-44_10x10mm_P0.8mm`+- 3D model: TQFP-44(10x10) (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Microchip datasheet](docs/atmega16a-au-datasheet.pdf) (19 pp, sha256 `191fad2628376ab8`, 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/atmega16a-au-datasheet.pdf)