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ATMEGA168-20PU datasheet pdf | Arduino
- CoreProcessor: AVR
- Core Size: 8-Bit
- Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
- Package: 28-DIP (0.300, 7.62mm)
ATmega168 Pinout
1：Overview of the ATmega168:
ATmega168 is an 8-bit microcontroller based on AVR, which is mainly used in embedded systems. The main features of ATmega168 are: 1: includes 16KB Flash program memory, 1KB SRAM data memory and 512 bytes EEPROM non-volatile memory, 2: ATmega168 Supports ISP online programming and repeated erasing. ATmega168 Chip adopts 32-pin TQFP package, working voltage range of 2.7V to 5.5V, and the highest main frequency is 16MHz. It also integrates SPI/I2C/UART communication interface, watchdog timer and low-power mode (idle/power off). It is suitable for intelligent temperature control, LED display drive and other scenarios. ATmega168 Supports C/C++ or Arduino IDE development, with a mature open source ecosystem and community resources.
2：ATmega168 Important pin function definition:
| Pin Number | Pin Name | Description |
|---|---|---|
| Pin4/6 | VCC | Digital supply voltage |
| Pin3/5/21 | GND | GND |
| Pin7/8/12–17 | Port B (PB7:0) | Port B is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port B output buffers have symmetrical drive characteristics with both high sink and source capability. |
| Pin23–29 | Port C (PC5:0) | Port C is a 7-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port C output buffers have symmetrical drive characteristics with both high sink and source capability. |
| Pin30–32/1/2 | Port D (PD7:0) | Port D is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port D output buffers have symmetrical drive characteristics with both high sink and source capability. |
| Pin6 | RESET | Reset input. A low level on this pin for longer than the minimum pulse length will generate a Reset, even if the clock is not running. |
| Pin18 | AVCC | AVcc is the supply voltage pin for the A/D Converter |
| Pin20 | AREF | AREF is the analog reference pin for the A/D Converter |
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