Specifications
| Attribute | Value |
| Supplier | Microchip Technology |
| Package / Case | Tray |
| Series | AVR® ATmega |
| Part Status | Active |
| Core Processor | AVR |
| Core Size | 8-Bit |
| Speed | 20MHz |
| Connectivity | I²C, SPI, UART/USART |
| Peripherals | Brown-out Detect/Reset, POR, PWM, WDT |
| Number of I/O | 23 |
| Program Memory Size | 16KB (8K x 16) |
| Program Memory Type | FLASH |
| EEPROM Size | 512 x 8 |
| RAM Size | 1K x 8 |
| Voltage - Supply (Vcc/Vdd) | 2.7V ~ 5.5V |
| Data Converters | A/D 8x10b |
| Oscillator Type | Internal |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount |
Overview
Description
ATmega168-20MU is an 8-bit AVR microcontroller from Atmel (now Microchip). It uses the AVR RISC core (one instruction per cycle) with 32 general-purpose registers. Key on-chip memory: 16 KB flash program memory, 1 KB SRAM, and 512 B EEPROM. It runs up to 20 MHz; at that speed, supply is typically 4.5–5.5 V (lower speeds allow 1.8–5.5 V). Peripherals include three timers (two 8‑bit, one 16‑bit), a 10-bit ADC with up to 6 channels, and serial interfaces: USART, SPI, and I2C (TWI). It provides multiple I/O pins, PWM outputs, an analog comparator, and various interrupt sources. Features like sleep modes, watchdog timer, and brown-out detection aid power management. It supports In-System Programming via SPI. The “-20MU” suffix indicates a 20 MHz clock option in the MU (package) variant. This device is widely used in hobbyist and embedded projects (and is a predecessor/relative to the ATmega328P in Arduino boards).
Features
Here are the key features of ATMEGA168-20MU (8-bit AVR, 28-pin SOIC variant):
- Core: AVR 8-bit RISC CPU, 32 general-purpose registers, single-cycle execute for most instructions
- Memory: 16 KB flash program memory, 1 KB SRAM, 512 bytes EEPROM
- Clock/Voltage: Up to 20 MHz operation; operating voltage typically 4.5–5.5V at 20 MHz (1.8–5.5V overall, speed dependent)
- Peripherals: 3 timers (Timer0 8-bit, Timer1 16-bit, Timer2 8-bit) with PWM outputs
- Analog: 8-channel, 10-bit ADC + Analog Comparator
- Communication: USART, SPI, I2C (TWI)
- I/O: Up to about 23 general-purpose I/O pins (on 28-pin package)
- Interrupts: Multiple interrupt sources with multiple vectored interrupts
- Debug/Programming: In-system programming (ISP) via SPI; JTAG interface for on-chip debugging on suitable packages
- Power management: Sleep modes (Idle, ADC Noise Reduction, Power-down, Power-save) and brown-out detector
- Boot/loading: Supports in-system bootloaders
Package: 28-pin SOIC (MU) form factor.
- Core: AVR 8-bit RISC CPU, 32 general-purpose registers, single-cycle execute for most instructions
- Memory: 16 KB flash program memory, 1 KB SRAM, 512 bytes EEPROM
- Clock/Voltage: Up to 20 MHz operation; operating voltage typically 4.5–5.5V at 20 MHz (1.8–5.5V overall, speed dependent)
- Peripherals: 3 timers (Timer0 8-bit, Timer1 16-bit, Timer2 8-bit) with PWM outputs
- Analog: 8-channel, 10-bit ADC + Analog Comparator
- Communication: USART, SPI, I2C (TWI)
- I/O: Up to about 23 general-purpose I/O pins (on 28-pin package)
- Interrupts: Multiple interrupt sources with multiple vectored interrupts
- Debug/Programming: In-system programming (ISP) via SPI; JTAG interface for on-chip debugging on suitable packages
- Power management: Sleep modes (Idle, ADC Noise Reduction, Power-down, Power-save) and brown-out detector
- Boot/loading: Supports in-system bootloaders
Package: 28-pin SOIC (MU) form factor.
Pinout
- Pin count: 32 pins (MU package, 32-pin TQFP/MLF)
- Function: ATmega168 is an 8-bit AVR microcontroller (embedded controller) with 16 KB flash, 1 KB EEPROM, 1 KB SRAM, running up to 20 MHz; includes USART, SPI, I2C (TWI), ADC, timers, and other peripherals for embedded control.
- Function: ATmega168 is an 8-bit AVR microcontroller (embedded controller) with 16 KB flash, 1 KB EEPROM, 1 KB SRAM, running up to 20 MHz; includes USART, SPI, I2C (TWI), ADC, timers, and other peripherals for embedded control.
Manufacturer
- Manufacturer: Microchip Technology Inc. (Atmel was acquired by Microchip in 2016; ATmega devices originated from Atmel).
- What kind of company: A global semiconductor company that designs and manufactures microcontrollers, memory, analog and other embedded ICs for embedded systems.
- What kind of company: A global semiconductor company that designs and manufactures microcontrollers, memory, analog and other embedded ICs for embedded systems.
Application
ATmega168-20MU is a small 8‑bit AVR microcontroller suitable for cost‑effective embedded systems. Typical application areas include:
- Consumer electronics and home automation (remote controls, thermostats, small appliances, clocks)
- Industrial sensing and instrumentation (temperature/humidity sensors, data loggers, panel meters)
- Robotics and motor control (PWM drive, sensor reading, simple controllers)
- Prototyping and education (hobby projects, Arduino‑like experiments)
- IoT and portable devices (with external interfaces)
- General low‑ to mid‑complexity control tasks requiring ADC, PWM, serial (USART/SPI/I2C) and timers
- Consumer electronics and home automation (remote controls, thermostats, small appliances, clocks)
- Industrial sensing and instrumentation (temperature/humidity sensors, data loggers, panel meters)
- Robotics and motor control (PWM drive, sensor reading, simple controllers)
- Prototyping and education (hobby projects, Arduino‑like experiments)
- IoT and portable devices (with external interfaces)
- General low‑ to mid‑complexity control tasks requiring ADC, PWM, serial (USART/SPI/I2C) and timers
Package
The ATmega168-20MU comes in a 28-pin SOIC (Surface-Mount) package. The MU suffix denotes the 28‑pin SOIC package type.
