ATMEGA168P-20MQR - 16KB AVR MCU, 20MHz, VQFN-32 | Microchip
MPN： ATMEGA168P-20MQR ✓ 啟用中ATMEGA168P-20MQR 概覽
An 8-bit AVR microcontroller is a self-contained computing device that integrates a RISC processor core, program memory, data memory, and peripherals such as timers, ADC, and serial interfaces on a single chip. Within the embedded systems hierarchy, the ATmega family sits under the broader AVR MCU line, which belongs to Microchip's microcontroller and digital signal processing portfolio, and is programmed through the In-Circuit Serial Programming (ICSP) interface using tools such as the MPLAB SNAP.
Key features include 131 powerful instructions with mostly single-cycle execution, 32 general purpose working registers, full static operation, and read-while-write FLASH capability for reliable firmware updates. The picoPower technology delivers extremely low sleep-mode consumption, making the device well suited to battery-operated designs. Peripherals include three flexible timer/counters with compare modes, an 8-channel 10-bit ADC, byte-oriented Two-Wire Interface (I2C), SPI serial port, and a programmable USART.
Technically, the AVR advanced RISC architecture achieves throughput near 1 MIPS per MHz, allowing system designers to trade clock speed against power dissipation. Operating voltage spans 1.8V to 5.5V; full 20MHz operation requires a supply of 4.5V to 5.5V per the datasheet speed-versus-voltage curves, while lower voltages constrain maximum clock frequency.
Typical applications include industrial sensor nodes, consumer appliance control boards, battery-powered metering, and hobby/embedded prototyping platforms compatible with Arduino-style ecosystems.
For design, note that the ATMEGA168PA is the manufacturer-recommended newer device for new designs; the P variant remains in production but the PA offers lower active current at equivalent performance.
This page synthesizes distributor pricing from DigiKey, Mouser, LCSC and Octopart, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
直接替換替代品，適用於 ATMEGA168P-20MQR — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： ATMEGA168P-20MQR （相同外形與佔位） — 差異在於 Package, ADC, Connectivity, Flash Memory, Number of ADC Channels.
ATMEGA168PA-20MUR
✅ 直接替換📋 參考替代品（不在目錄中）
ATMEGA168P-20MU
✅ 直接替換聯絡詢價
查看資料表 →ATMEGA168-20MQR
✅ 直接替換聯絡詢價
查看資料表 →ATMEGA168A-MU
✅ 直接替換聯絡詢價
查看資料表 →ATMEGA328P-20MUR
✅ 直接替換📋 參考替代品（不在目錄中）
ATMEGA48-20MU
✅ 直接替換📋 參考替代品（不在目錄中）
ATMEGA168P-20MQR 最大額定值與電氣特性
| Core | AVR 8-bit RISC |
| Core Size | 8-bit |
| Speed | 20 MHz |
| Flash Memory | 16 KB (8K x 16) |
| EEPROM | 512 B |
| SRAM | 1 KB |
| Instructions | 131 powerful instructions, most single-cycle |
| General Purpose I/O | 23 |
| Working Registers | 32 |
| Timers/Counters | 3 flexible timer/counters |
| ADC | 8-channel 10-bit |
| Operating Voltage | 1.8 V to 5.5 V |
| Voltage - Supply (Vcc/Vdd) | 1.8 V to 5.5 V (20 MHz at 4.5 V to 5.5 V) |
| 工作溫度 | -40C to +85C |
| 封裝 | 32-VQFN (5x5 mm) with exposed pad |
| 安裝類型 | Surface Mount |
| Programming Interface | ICSP (In-Circuit Serial Programming) |
| Technology | picoPower low-power |
| RoHS 狀態 | RoHS3 compliant (per distributor data) |
| Newer Device Available | Yes - ATMEGA168PA |
ATMEGA168P-20MQR 腳位配置
| 腳位 1 | PC6/RESET — Port C bit 6 / Reset input (active low); also debugWIRE pin |
| 腳位 2 | PD0/RXD — Port D bit 0 / USART receive input |
| 腳位 3 | PD1/TXD — Port D bit 1 / USART transmit output |
| 腳位 4 | PD2/INT0 — Port D bit 2 / External interrupt 0 input |
| 腳位 5 | PD3/INT1/OC2B — Port D bit 3 / External interrupt 1 / Timer2 output compare B |
| 腳位 6 | PD4/T0/XCK — Port D bit 4 / Timer0 counter input / USART external clock |
| 腳位 7 | VCC — Digital supply voltage |
| 腳位 8 | GND — Ground |
| 腳位 9 | PB6/XTAL1/TOSC1 — Port B bit 6 / Crystal oscillator pin 1 / Timer oscillator input |
| 腳位 10 | PB7/XTAL2/TOSC2 — Port B bit 7 / Crystal oscillator pin 2 / Timer oscillator output |
| 腳位 11 | PD5/T1/OC0B — Port D bit 5 / Timer1 counter input / Timer0 output compare B |
| 腳位 12 | PD6/AIN0/OC0A — Port D bit 6 / Analog comparator positive input / Timer0 output compare A |
| 腳位 13 | PD7/AIN1 — Port D bit 7 / Analog comparator negative input |
| 腳位 14 | PB0/ICP1/CLKO — Port B bit 0 / Timer1 input capture / System clock output |
| 腳位 15 | PB1/OC1A — Port B bit 1 / Timer1 output compare A |
| 腳位 16 | PB2/SS/OC1B — Port B bit 2 / SPI slave select / Timer1 output compare B |
| 腳位 17 | PB3/MOSI/OC2A — Port B bit 3 / SPI master data out / Timer2 output compare A |
| 腳位 18 | PB4/MISO — Port B bit 4 / SPI master data in |
| 腳位 19 | PB5/SCK — Port B bit 5 / SPI serial clock |
| 腳位 20 | AVCC — ADC supply voltage |
| 腳位 21 | AREF — ADC analog reference input |
| 腳位 22 | GND — Ground |
| 腳位 23 | PC0/ADC0 — Port C bit 0 / ADC channel 0 |
| 腳位 24 | PC1/ADC1 — Port C bit 1 / ADC channel 1 |
| 腳位 25 | PC2/ADC2 — Port C bit 2 / ADC channel 2 |
| 腳位 26 | PC3/ADC3 — Port C bit 3 / ADC channel 3 |
| 腳位 27 | PC4/ADC4/SDA — Port C bit 4 / ADC channel 4 / Two-Wire data line |
| 腳位 28 | PC5/ADC5/SCL — Port C bit 5 / ADC channel 5 / Two-Wire clock line |
| 腳位 29 | GND — Ground (VQFN-32 corner pin) |
| 腳位 30 | GND — Ground (VQFN-32 corner pin) |
| 腳位 31 | GND — Ground (VQFN-32 corner pin) |
| 腳位 32 | GND — Ground (VQFN-32 corner pin) |
典型應用
ATMEGA168P-20MQR 適用於 6 應用s: Industrial Sensor Nodes, Battery-Powered Metering, Consumer Appliance Control, Embedded Prototyping and Maker Boards, Motor and Actuator Control, IoT Edge Sensing and Lighting Control.
Industrial Sensor Nodes
The ATMEGA168P-20MQR fits industrial sensor nodes because its 23 GPIO lines, 8-channel 10-bit ADC, and -40C to +85C industrial temperature rating cover analog signal acquisition and digital control in harsh factory environments. The picoPower Power-down sleep mode allows battery-backed nodes to idle at microamp-level current between periodic ADC sampling of pressure, temperature, or proximity signals. Data is transmitted over the on-chip USART or Two-Wire Interface (I2C) to a gateway, while the 16KB FLASH accommodates protocol stacks with read-while-write support for field firmware updates via ICSP.
推薦
Battery-Powered Metering
In battery-powered metering applications, the ATMEGA168P-20MQR's picoPower technology and six sleep modes let designers duty-cycle the 20MHz core so that average current stays within coin-cell budgets. The 10-bit ADC samples energy or flow signals, the 512B EEPROM stores calibration constants across power cycles without external NVM, and the 1.8V low-voltage operation extends usable battery life as cells discharge. Wake-up via asynchronous timer from Power-save mode supports periodic logging, while the 16KB FLASH holds compensation algorithms and communication firmware with headroom to spare.
推薦
Consumer Appliance Control
Consumer appliance control boards benefit from the ATMEGA168P-20MQR's low cost, 5V tolerance, and integrated peripherals that eliminate external components: three timer/counters drive buttons, buzzer tones, and PWM-dimmed displays; the USART communicates with main boards; and the 8-channel ADC reads thermistors and potentiometers. The 32-VQFN 5x5 mm exposed-pad package conserves PCB area in compact housings, and the industrial -40C to +85C rating tolerates kitchens and garages. With 131 mostly single-cycle instructions, the AVR core executes control loops deterministically at modest clock rates, reducing EMI and power.
推薦
Embedded Prototyping and Maker Boards
The ATMEGA168P-20MQR is widely used in embedded prototyping platforms because the AVR architecture is the core family behind Arduino-compatible boards, supported by mature open-source toolchains (avrdude, Arduino IDE) and the ICSP interface compatible with MPLAB SNAP and AVR ISP mkII programmers. The 16KB FLASH hosts a bootloader plus application code, the 1KB SRAM handles sensor libraries, and 23 GPIO breakout lines enable shields and rapid prototyping. Engineers value the datasheet's register-level documentation and the pin-compatibility path to ATMEGA328P for scaling designs to production.
推薦
Motor and Actuator Control
For small motor and actuator control, the ATMEGA168P-20MQR's three flexible timer/counters generate PWM with phase-correct and fast-PWM modes plus input capture for encoder feedback, all without CPU overhead. The 20MHz/20 MIPS throughput executes PI control loops deterministically, the 10-bit ADC samples current shunts and potentiometer setpoints, and interrupts on PORTB/PD pins handle limit-switch events with microsecond latency. The 5.5V maximum supply allows direct operation from unregulated 5V rails, and the VQFN exposed pad provides a solid ground reference for switching-noise immunity in drive circuits.
推薦
IoT Edge Sensing and Lighting Control
In IoT edge nodes and connected lighting, the ATMEGA168P-20MQR acts as the low-power sensor and actuation front end that wakes from Power-down via watchdog or pin-change interrupt, samples ambient light or occupancy through the 10-bit ADC, and relays status over SPI or I2C to a wireless SoC. The 16KB FLASH accommodates comms framing and OTA update stubs, while picoPower sleep modes keep average draw compatible with energy-harvesting supplies. PWM timers drive LED dimming channels with flicker-free resolution, and the industrial temperature range suits outdoor luminaires and unconditioned enclosures.
推薦
推薦產品摘要
工程參考資料，適用於 ATMEGA168P-20MQR — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | ATMEGA168PA-20MUR | ATMEGA168-20MQR | ATMEGA328P-20MUR | ATMEGA48-20MU |
|---|---|---|---|---|---|
| Package | 32-VQFN (5x5) exposed pad | 32-VQFN (5x5) - same | 32-VQFN (5x5) - same | 32-VQFN (5x5) - same | 32-VQFN (5x5) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 16 KB | 16 KB | 16 KB | 32 KB | 4 KB |
| SRAM | 1 KB | 1 KB | 1 KB | 2 KB | 512 B |
| EEPROM | 512 B | 512 B | 512 B | 1 KB | 256 B |
| Maximum Clock | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| picoPower Low-Power Die | Yes | Yes (lowest power) | No | Yes | No |
主要差異化特點
- picoPower die with lowest sleep current (對比ATMEGA168-20MQR)
- 16KB FLASH is the memory sweet spot (對比ATMEGA48-20MU)
- Cost-optimal versus larger memory (對比ATMEGA328P-20MUR)
設計說明
Observe the speed-versus-voltage derating: the datasheet guarantees 20MHz only at 4.5V-5.5V. At 3.3V, limit the clock to approximately 13.3MHz or use the internal 8MHz RC oscillator. Decouple VCC and AVCC separately with 100nF ceramics placed within 5mm of each pin, and connect AVCC to VCC through an LC filter when ADC accuracy matters - noise on AVCC directly degrades 10-bit ADC effective resolution.
The exposed pad on the 32-VQFN must be soldered to a grounded copper pour - it is the primary ground return, and pins 29-32 are corner GND pins only. Use a 3x3 via array under the pad for thermal and electrical performance. Keep the crystal (PB6/PB7) traces under 10mm with ground guard traces, and route ADC traces away from PWM and USART lines to preserve analog signal integrity.
RESET/PC6 doubles as the debugWIRE and ICSP line: do not add heavy capacitive loading or a pull-down here, as it breaks programming. If using PB6/PB7 as GPIO instead of a crystal, disable the external clock fuse options first or the device may become inaccessible. For long-term supply security, prefer the ATMEGA168PA (the manufacturer-designated successor) for new designs per the Microchip datasheet recommendation.
合規資訊
Distributor data indicates RoHS3 compliance and Pb-free matte-tin lead finish for the MQ build. REACH and conflict mineral status per Microchip product pages.
