ATMEGA8-16AU - 8-bit AVR MCU 16MHz 8KB Flash | Microchip
料号： ATMEGA8-16AU ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $2.95 | $2.95 |
| 10 | $2.66 | $26.60 |
| 100 | $2.29 | $229.00 |
| 500 | $2.02 | $1,010.00 |
| 1,000 | $1.78 | $1,780.00 |
ATMEGA8-16AU 概述
An 8-bit microcontroller (MCU) is a self-contained computing chip that integrates a processor core, memory, and peripherals on a single die. Within the power-management hierarchy of embedded systems, the ATmega8 belongs to the AVR family of reduced-instruction-set (RISC) MCUs, positioned as a compact workhorse for control tasks where 32-bit processors are unnecessary.
Key features include the Advanced RISC architecture with 130 powerful instructions, most executing in a single clock cycle, plus 32 general-purpose working registers. Peripherals include two 8-bit timers/counters with PWM, one 16-bit timer, a 10-bit ADC with 6 or 8 multiplexed channels, a byte-oriented Two-Wire Interface (I2C-compatible), an SPI serial port, and a programmable USART. In-System Programmable (ISP) FLASH allows firmware updates on the assembled board.
Architecturally, the AVR Harvard design accesses program and data memory simultaneously, sustaining close to 1 MIPS per MHz of clock, so the 16 MHz ATMEGA8-16AU delivers roughly 16 MIPS throughput. ISP and self-programming support field updates without removing the chip.
Typical applications include industrial automation and sensor control, motor control and power-conversion boards, consumer appliances, hobbyist and Arduino-compatible boards (the MiniCore project supports ATmega8), and instrumentation front-ends using the 10-bit ADC.
A key design consideration: the 4.5-5.5 V supply range means this speed grade is not suitable for 3.3 V rails; use the ATmega8L-8AU for low-voltage designs. Provide proper ISP header and crystal layout on the XTAL1/XTAL2 pins.
This page synthesizes distributor listings, drop-in alternatives, cross-reference data, and practical design notes not found in the manufacturer datasheet.
直接替换替代料： ATMEGA8-16AU ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： ATMEGA8-16AU （相同外形与封装尺寸） ——差异在于 Package, Operating Temperature, Throughput, ADC, Communication Interfaces.
快速对比工具——选择替代料号进行并排对比：
ATMEGA8A-AU
✅ 直接替换✓ 有现货
$1.31 / 个
查看数据手册 →ATMEGA8-16AI
✅ 直接替换✓ 有现货
$2.46 / 个
查看数据手册 →ATMEGA88-20AU
✅ 直接替换✓ 有现货
$2.33 / 个
查看数据手册 →ATMEGA48-20AU
✅ 直接替换✓ 有现货
$1.68 / 个
查看数据手册 →ATMEGA48PA-AU
✅ 直接替换✓ 有现货
$1.38 / 个
查看数据手册 →ATMEGA8-16AU 最大额定值与电气特性
| Core Processor | AVR |
| Core Size | 8-Bit |
| Speed | 16 MHz |
| Program Memory Size | 8 KB (4K x 16) FLASH |
| EEPROM Size | 512 B |
| RAM Size | 1 KB SRAM |
| 电源电压 | 4.5 V to 5.5 V |
| I/O Count | 23 |
| Architecture | Advanced RISC, 130 instructions |
| ADC Resolution | 10-bit |
| ADC Channels | 6 or 8 multiplexed channels |
| Peripherals | 2x 8-bit timer, 1x 16-bit timer, PWM, USART, SPI, TWI (I2C) |
| 封装 | 32-TQFP, 7 x 7 mm, 0.8 mm pitch |
| 安装类型 | Surface Mount |
| Programmability | In-System Programmable (ISP) FLASH |
| Life Cycle Stage | Active |
| Throughput | Up to 16 MIPS at 16 MHz |
| RoHS 状态 | Green / RoHS compliant (per distributor listing) |
ATMEGA8-16AU 32-tqfp, 7 x 7 mm, 0.8 mm pitch 引脚配置指南
ATMEGA8-16AU（32-tqfp, 7 x 7 mm, 0.8 mm pitch 封装）的引脚配置。 该数字 IC 包含 GPIO、通信接口（UART、SPI、I2C）和电源引脚。请参阅制造商数据手册以了解复用引脚功能和配置选项。对嵌入式系统设计和 PCB 布局至关重要。
暂无详细引脚数据： ATMEGA8-16AU.
请参阅 数据手册 以查看完整引脚配置。
典型应用
ATMEGA8-16AU 适用于 6 应用s: Industrial Automation and Sensor Control, Motor Control and PWM Power Conversion, Arduino-Compatible and Educational Boards, Measurement and Instrumentation Front-Ends, Home Appliances and Consumer Electronics, Embedded Communication Nodes.
Industrial Automation and Sensor Control
The ATMEGA8-16AU fits industrial automation nodes that need deterministic 8-bit control rather than application-processor overhead: its 130-instruction RISC core sustains up to 16 MIPS at 16 MHz, enough to poll sensors, run PID control loops, and drive relays from its 23 I/O lines. The 10-bit ADC with 6-8 multiplexed channels digitizes 0-5 V transducer signals directly, while the TWI (I2C) and SPI ports link to external EEPROM, displays, and isolated I/O expanders. The 4.5-5.5 V supply range matches legacy 5 V industrial rails and 24 V systems via a simple regulator. Use the 16-bit Timer/Counter1 input capture for precise pulse timing from encoders or flow meters. Firmware fits comfortably in the 8 KB ISP FLASH with 1 KB SRAM for buffering and state machines.
推荐
Motor Control and PWM Power Conversion
With three timers offering multiple PWM channels - two 8-bit timers and one 16-bit Timer/Counter1 - the ATMEGA8-16AU can generate complementary PWM waveforms for DC motor drives, LED dimming, and small inverter stages. At 16 MHz, an 8-bit PWM reaches about 62.5 kHz, comfortably above audible range, while 10-bit phase-correct modes trade resolution for frequency. The ADC can sample back-EMF or shunt current for closed-loop speed control, and the analog comparator supports zero-crossing detection for sensorless BLDC startup. The 5 V CMOS outputs drive MOSFET gate drivers such as the IR2104 directly. The 8 KB FLASH accommodates commutation tables and PI control code, and the USART enables speed-command interfaces to supervisory controllers.
推荐
Arduino-Compatible and Educational Boards
The ATMEGA8-16AU remains popular in DIY and educational hardware because the MCUdude MiniCore Arduino package supports ATmega8 boards, and the chip programs over the same 6-pin ISP header as ATmega328 boards. Its 16 MIPS at 16 MHz matches classic Arduino timing (delay, Serial, and millis behave identically), the 10-bit ADC reads analog inputs, and the hardware USART provides USB-serial bridged sketching. The 32-TQFP version suits compact Shields and breadboard-adapted carrier PCBs. Designers should budget the ~7.5 KB usable FLASH carefully, avoiding heavy libraries such as large SD card stacks. The ATMEGA8A-AU is the preferred solder-down part for new boards, with identical footprint and Arduino compatibility plus lower power draw.
推荐
Measurement and Instrumentation Front-Ends
For low-cost instrumentation, the ATMEGA8-16AU combines a 10-bit successive-approximation ADC (6-8 channels, single-ended or differential with selectable gain) with an on-chip analog comparator, allowing direct digitization of thermistors, potentiometers, and bridge sensors scaled to the 5 V reference (AREF pin supports external precision references). The 512 B EEPROM stores calibration constants through power cycles, and TWI connects precision devices such as the DS1621 temperature sensor or dedicated ADCs when higher resolution is needed. Differential ADC modes with 1x/20x gain amplify low-level signals without external op-amps. The 16-bit Timer1 input capture timestamps external events for frequency and period measurement with crystal-level stability, and the USART streams results to a host.
推荐
Home Appliances and Consumer Electronics
In appliance control boards - coffee machines, fans, small heaters, and chargers - the ATMEGA8-16AU provides a cost-effective 5 V controller: the 8 KB FLASH holds UI state machines, the ADC reads NTC temperature sensors and user potentiometers, and timer PWM drives triac-firing or heater duty cycles. The brown-out detector and internal RC oscillator option let cost-sensitive boards run without a crystal for non-timing-critical functions, while the watchdog timer recovers from lockups. The 4.5-5.5 V operating range matches transformer-derived linear supplies common in appliances. EEPROM retains user settings such as temperature presets through outages. ISP capability allows manufacturing-line firmware flashing of the populated board, simplifying production and field updates without socketed parts.
推荐
Embedded Communication Nodes
The ATMEGA8-16AU integrates the three classic serial interfaces needed for communication nodes: a hardware USART (with baud rates derived from a UBRRL register for error-minimized links up to 1 Mbps at 16 MHz), an SPI master/slave port, and a TWI bus compatible with I2C. This makes it a natural protocol bridge - for example, translating Modbus RTU frames on RS-485 into TWI commands for remote I/O, or gatewaying SPI sensors onto a two-wire backplane. The 1 KB SRAM buffers multi-byte frames, and Timer2's asynchronous mode can clock a 32.768 kHz crystal for accurate RTC timestamping. With the ISP FLASH, protocol firmware updates deploy over the same bus. Differential transceivers attach directly to the 5 V USART pins.
推荐
推荐产品汇总
工程参考数据： ATMEGA8-16AU ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | ATMEGA8A-AU | ATMEGA8-16AI | ATMEGA88-20AU | ATMEGA48-20AU |
|---|---|---|---|---|---|
| Package | 32-TQFP (7x7 mm, 0.8 mm pitch) | 32-TQFP - same footprint | 32-TQFP - same footprint | 32-TQFP - same footprint | 32-TQFP - same footprint |
| Brand | Microchip Technology (Atmel) | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Max Clock Speed | 16 MHz | 16 MHz | 16 MHz | 20 MHz | 20 MHz |
| FLASH Memory | 8 KB ISP FLASH | 8 KB | 8 KB | 8 KB | 4 KB |
| SRAM | 1 KB | 1 KB | 1 KB | 1 KB | 512 B |
| Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V (20 MHz grade) | 4.5 V to 5.5 V |
| Pin Compatibility / Firmware | Baseline (ATmega8 register map) | Pin-to-pin, same register map - code drop-in | Pin-to-pin, same register map - code drop-in | Pin-to-pin, different register map (per AVR094) | Pin-to-pin, different register map |
| Typical Use Case | Legacy 5 V control, hobby/industrial | New designs on ATmega8 platform (recommended) | Industrial temperature deployments | Higher-speed ATmega8 migration | Cost-reduced small-firmware designs |
关键差异点
- Software drop-in within the same die family （对比 ATMEGA8A-AU)
- True in-system programmability on 8 KB FLASH （对比 ATMEGA48-20AU)
- 16 MIPS single-cycle RISC throughput （对比 ATMEGA8-16AI)
- Trade-off: fixed 5 V operation （对比 ATMEGA48PA-AU)
设计说明
The ATMEGA8-16AU is a 5 V part: its 16 MHz rating is only valid from 4.5 V to 5.5 V. Do not power it from 3.3 V rails - below 4 V the device may not start or meet timing, and flash writes are prohibited below 4.5 V per the datasheet's low-voltage programming rules. Decouple VCC and AVCC with 100 nF ceramics placed within 5 mm of each pin, and connect AVCC to VCC through a low-pass LC filter (10 uH + 100 nF) when ADC accuracy matters. Keep AREF clean with a 100 nF cap; never drive AREF while the internal reference is enabled.
Route the XTAL1/XTAL2 crystal (PB6/PB7) with short, symmetric traces and place the 22 pF load capacitors close to the pins, with a guard ground ring. Reserve the standard 2x3 ISP header (MOSI=PB3, MISO=PB4, SCK=PB5, RESET=PC6) on every production PCB so the assembled board can be flashed in-system. Ensure any peripheral on the SPI pins (e.g., SD cards, display modules) cannot load MISO/SCK during programming - series 1k-4.7k resistors on SCK and MOSI isolate programming conflicts.
Migrating to ATMEGA88-20AU or ATMEGA48-20AU saves cost or adds speed, but their register maps differ from ATmega8: application note AVR094 documents I/O registers that changed location and name, and GPIO/ADC control bits moved. Code recompiled from ATmega8 sources will not simply work - plan a firmware review. Also note RESET is multiplexed with PC6: enabling PC6 as GPIO removes in-circuit programming access, so fuse a reset-disabled part only after final programming, and keep the RESET pull-up (10k) populated.
Estimated: at 16 MHz with all 23 I/O high and 20 mA loads, worst-case internal dissipation is roughly ICC(~15 mA) + 23 x 20 mA x (5 V - VOH) which stays well under the TQFP-32 7x7 mm package capability with standard 2 oz copper pours; no heatsink is required for typical MCU duty. Only in designs toggling many high-current outputs continuously should junction temperature be calculated from the datasheet thermal resistance figure - confirm the exact theta-JA value from the current datasheet revision.
合规信息
Distributor listings (DigiKey, FindIC) describe the ATMEGA8-16AU as GREEN, indicating RoHS compliance and lead-free construction. REACH, halogen-free, and conflict-minerals status should be confirmed via the Microchip product compliance page.
