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ATMEGA168-15AD

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by Ray

Microchip Tech Microcontroller Units (MCUs/MPUs/SOCs), TQFP-32(7x7). Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Contents

README

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ATMEGA168-15AD

Microchip Tech · Microcontroller Units (MCUs/MPUs/SOCs) · TQFP-32(7x7)

ATMEGA168-15AD from Microchip Tech, 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. Alternate functions: pin-change interrupt 19 (PCINT19), Timer/Counter2 output-compare match B (OC2B, PWM), external interrupt 1 (INT1).
2 PD4/PCINT20/XCK/T0 bidirectional Port D bit 4. Alt: PCINT20, USART external clock (XCK), Timer/Counter0 external counter input (T0).
3 GND power_in Digital ground reference (0 V).
4 VCC power_in Digital supply voltage, 2.7-5.5 V. Decouple to GND with 100 nF close to the pin.
5 GND power_in Digital ground reference (0 V). Second GND pin for the digital rail.
6 VCC power_in Digital supply voltage, 2.7-5.5 V. Second VCC pin; tie to same rail as pin 4.
7 PB6/PCINT6/XTAL1/TOSC1 bidirectional Port B bit 6. Alt: PCINT6; crystal oscillator input (XTAL1) when external crystal is fuse-selected; asynchronous Timer/Counter2 osc input (TOSC1) when internal RC is selected and AS2=1.
8 PB7/PCINT7/XTAL2/TOSC2 bidirectional Port B bit 7. Alt: PCINT7; crystal oscillator output (XTAL2); Timer/Counter2 async osc pin (TOSC2).
9 PD5/PCINT21/OC0B/T1 bidirectional Port D bit 5. Alt: PCINT21, Timer/Counter0 output-compare B (OC0B, PWM), Timer/Counter1 external counter input (T1).
10 PD6/PCINT22/OC0A/AIN0 bidirectional Port D bit 6. Alt: PCINT22, Timer/Counter0 output-compare A (OC0A, PWM), analog-comparator positive input (AIN0).
11 PD7/PCINT23/AIN1 bidirectional Port D bit 7. Alt: PCINT23, analog-comparator negative input (AIN1).
12 PB0/PCINT0/CLKO/ICP1 bidirectional Port B bit 0. Alt: PCINT0, divided system clock output (CLKO, CKOUT fuse), Timer/Counter1 input-capture (ICP1).
13 PB1/PCINT1/OC1A bidirectional Port B bit 1. Alt: PCINT1, Timer/Counter1 output-compare A (OC1A, PWM).
14 PB2/PCINT2/SS/OC1B bidirectional Port B bit 2. Alt: PCINT2, SPI slave-select (SS, active-low; also selects master mode when configured as output), Timer/Counter1 output-compare B (OC1B, PWM).
15 PB3/PCINT3/OC2A/MOSI bidirectional Port B bit 3. Alt: PCINT3, Timer/Counter2 output-compare A (OC2A, PWM), SPI master-out/slave-in (MOSI) - also serial-programming data in (PDI/MOSI).
16 PB4/PCINT4/MISO bidirectional Port B bit 4. Alt: PCINT4, SPI master-in/slave-out (MISO) - also serial-programming data out (PDO/MISO).
17 PB5/SCK/PCINT5 bidirectional Port B bit 5. Alt: SPI clock (SCK), PCINT5 - also serial-programming clock during ISP.
18 AVCC power_in Analog supply pin for the A/D converter and Port C. Must be tied to VCC even if ADC is unused; if the ADC is used, connect to VCC through an LC/RC low-pass filter (typ. 10 uH + 100 nF).
19 ADC6 input Dedicated analog input, ADC channel 6 (10-bit). Available on TQFP/QFN packages only. Powered from AVCC; no digital I/O function.
20 AREF passive Analog reference for the A/D converter. Bypass to GND with 100 nF when an internal reference is used.
21 GND power_in Analog ground return; tie to the same ground plane as pins 3 and 5.
22 ADC7 input Dedicated analog input, ADC channel 7 (10-bit). Available on TQFP/QFN packages only. Powered from AVCC; no digital I/O function.
23 PC0/ADC0/PCINT8 bidirectional Port C bit 0. Alt: ADC channel 0 (10-bit), PCINT8. Powered from AVCC.
24 PC1/ADC1/PCINT9 bidirectional Port C bit 1. Alt: ADC1, PCINT9.
25 PC2/ADC2/PCINT10 bidirectional Port C bit 2. Alt: ADC2, PCINT10.
26 PC3/ADC3/PCINT11 bidirectional Port C bit 3. Alt: ADC3, PCINT11.
27 PC4/ADC4/SDA/PCINT12 bidirectional Port C bit 4. Alt: ADC4, TWI (I2C) data line SDA, PCINT12. Requires external pull-up (typ. 4.7 kΩ) when used as SDA.
28 PC5/ADC5/SCL/PCINT13 bidirectional Port C bit 5. Alt: ADC5, TWI (I2C) clock SCL, PCINT13. Requires external pull-up (typ. 4.7 kΩ) when used as SCL.
29 PC6/RESET/PCINT14 input Active-low reset input by default. Low level longer than the minimum pulse (see Table 8-1) generates a reset even without a running clock. When the RSTDISBL fuse is programmed the pin becomes general-purpose I/O PC6 (with reduced drive versus other Port C pins).
30 PD0/RXD/PCINT16 bidirectional Port D bit 0. Alt: USART receive data (RXD), PCINT16.
31 PD1/TXD/PCINT17 bidirectional Port D bit 1. Alt: USART transmit data (TXD), PCINT17.
32 PD2/INT0/PCINT18 bidirectional Port D bit 2. Alt: external interrupt 0 (INT0), PCINT18.

Key specifications

Parameter Value
Manufacturer Microchip Tech
Package TQFP-32(7x7)
Category Single Chip Microcomputer/Microcontroller
Pins 32

Ordering variants

Same part, different packaging or reel option.

  • ATMEGA168-15AD
  • ATMEGA168-15AD15MD

CAD (KiCad official)

  • Symbol: ATMEGA168-15AD
  • Footprint: Package_QFP:TQFP-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 Tech datasheet (288 pp, sha256 b135fcb7cfdd8e96, 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