ATMEGA8-16PU - 8-Bit AVR MCU 16MHz 8KB Flash | Microchip
部品番号: ATMEGA8-16PU ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $3.2 | $3.20 |
| 10 | $2.88 | $28.80 |
| 100 | $2.56 | $256.00 |
| 500 | $2.3 | $1,150.00 |
| 1,000 | $2.05 | $2,050.00 |
ATMEGA8-16PU 概要
A microcontroller (MCU) is a single-chip computer that integrates a processor core, program memory, data memory, and peripherals such as timers, serial interfaces, and analog-to-digital converters. Within the embedded systems hierarchy, the ATmega8 belongs to the AVR ATmega family of 8-bit microcontrollers, positioned above tinyAVR parts and below the ATmega64/128 family, and it competes with Microchip PIC16 and STMicroelectronics STM8 devices.
Key differentiating features include the advanced AVR RISC architecture with 130 powerful instructions, most executing in a single clock cycle, plus 32 general-purpose 8-bit working registers that enable the 1 MIPS/MHz throughput rating. The device integrates three flexible timer/counters, a 10-bit ADC with 8 channels, I2C (Two-Wire Interface), SPI, and UART/USART connectivity, a programmable watchdog timer, internal calibrated RC oscillator, and brown-out detection.
Technical depth: the read-while-write FLASH supports true in-system programming via SPI, and the separate on-chip boot loader program section allows firmware updates over the serial port without external programmer hardware. Fully static operation permits clocking down to 0 Hz for minimum power consumption in idle and power-down sleep modes.
Typical applications include hobbyist and education platforms (Arduino-compatible boards via MiniCore), industrial sensor nodes, motor control with PWM timer outputs, LED displays, and small embedded control products where through-hole mounting simplifies prototyping.
Design consideration: the PDIP package is ideal for breadboarding, but at 16 MHz ensure a proper decoupling capacitor (100 nF) close to VCC/GND and use an external crystal with appropriate load capacitors for clock accuracy.
This page synthesizes distributor pricing, verified drop-in alternatives such as ATMEGA8A-PU, and practical design notes not found in the manufacturer datasheet.
ドロップイン代替品: ATMEGA8-16PU — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: ATMEGA8-16PU （同一形状・フットプリント） — 相違点: Operating Temperature, EEPROM, Instructions, SRAM, Timers.
クイック比較ツール — 並列比較する代替部品を選択:
ATMEGA8A-PU
✅ ドロップイン✓ 在庫あり
$1.86 / 個
データシートを見る →ATMEGA8-16PI
✅ ドロップイン✓ 在庫あり
$1.85 / 個
データシートを見る →ATMEGA8L-8PU
✅ ドロップイン✓ 在庫あり
$3.08 / 個
データシートを見る →ATMEGA88PA-PU
✅ ドロップイン✓ 在庫あり
$1.85 / 個
データシートを見る →ATMEGA48PA-PU
✅ ドロップイン ⚠️ 仕様未検証✓ 在庫あり
$2.05 / 個
データシートを見る →ATMEGA48-20PI
✅ ドロップイン ⚠️ 仕様未検証✓ 在庫あり
$0.98 / 個
データシートを見る →ATMEGA8-16PU 最大定格＆電気的特性
| Core Processor | AVR |
| Core Size | 8-Bit |
| Speed | 16 MHz |
| Program Memory Size | 8 KB (4K x 16) FLASH |
| EEPROM Size | 512 B |
| SRAM Size | 1 KB |
| Number of I/O | 23 |
| Connectivity | I2C, SPI, UART/USART |
| Peripherals | Brown-out Detect/Reset, POR, PWM, WDT |
| ADC Resolution | 10-bit |
| Timers/Counters | 3 (two 8-bit, one 16-bit) |
| パッケージ | 28-PDIP |
| 実装タイプ | Through Hole |
| 動作温度 | 0C to 70C |
| Throughput | 16 MIPS at 16 MHz |
| Instructions | 130 (most single-cycle) |
ATMEGA8-16PU ピン構成
| ピン 1 | RESET/PC6 — Reset input or digital I/O PC6 |
| ピン 2 | PD0/RXD — Port D bit 0 / UART receive input |
| ピン 3 | PD1/TXD — Port D bit 1 / UART transmit output |
| ピン 4 | PD2/INT0 — Port D bit 2 / External interrupt 0 |
| ピン 5 | PD3/INT1 — Port D bit 3 / External interrupt 1 |
| ピン 6 | PD4/T0/XCK — Port D bit 4 / Timer0 counter input / USART clock |
| ピン 7 | VCC — Digital supply voltage |
| ピン 8 | GND — Ground |
| ピン 9 | PB6/XTAL1/TOSC1 — Port B bit 6 / Crystal oscillator input / Timer oscillator |
| ピン 10 | PB7/XTAL2/TOSC2 — Port B bit 7 / Crystal oscillator output / Timer oscillator |
| ピン 11 | PD5/T1/OC1B — Port D bit 5 / Timer1 counter input / Timer1 output compare B |
| ピン 12 | PD6/AIN0/ICP1 — Port D bit 6 / Analog comparator positive input / Timer1 input capture |
| ピン 13 | PD7/AIN1/OC2 — Port D bit 7 / Analog comparator negative input / Timer2 output compare |
| ピン 14 | PB0/ICP1/CLKO — Port B bit 0 / Timer1 input capture / System clock output |
| ピン 15 | PB1/OC1A — Port B bit 1 / Timer1 output compare A (PWM) |
| ピン 16 | PB2/SS/OC1B — Port B bit 2 / SPI slave select / Timer1 output compare B |
| ピン 17 | PB3/MOSI/OC2 — Port B bit 3 / SPI master data out / Timer2 output compare |
| ピン 18 | PB4/MISO — Port B bit 4 / SPI master data in |
| ピン 19 | PB5/SCK — Port B bit 5 / SPI serial clock |
| ピン 20 | AVCC — ADC supply voltage |
| ピン 21 | AREF — ADC analog reference voltage |
| ピン 22 | GND — Ground |
| ピン 23 | PC0/ADC0 — Port C bit 0 / ADC channel 0 |
| ピン 24 | PC1/ADC1 — Port C bit 1 / ADC channel 1 |
| ピン 25 | PC2/ADC2 — Port C bit 2 / ADC channel 2 |
| ピン 26 | PC3/ADC3 — Port C bit 3 / ADC channel 3 |
| ピン 27 | PC4/ADC4/SDA — Port C bit 4 / ADC channel 4 / I2C data |
| ピン 28 | PC5/ADC5/SCL — Port C bit 5 / ADC channel 5 / I2C clock |
主な用途
ATMEGA8-16PU の用途: 6 件s: Hobbyist and Education / Arduino-Compatible Boards, Industrial Sensor Nodes, PWM Motor Control, Embedded Control in Legacy Equipment Maintenance, Battery-Powered Portable Devices, LED Displays and Lighting Control.
Hobbyist and Education / Arduino-Compatible Boards
The ATMEGA8-16PU is a staple of embedded systems education because its 28-pin PDIP package plugs directly into breadboards and ZIF sockets, allowing students to wire VCC (pin 7), GND (pins 8 and 22), a 16 MHz crystal on XTAL1/XTAL2 (pins 9-10), and an ISP header over PB3-PB5 without any custom PCB. The MiniCore Arduino package provides full IDE toolchain support, so blink-to-PWM projects run on the same code base as ATmega328 boards. Its 8 KB FLASH is sufficient for UART, SPI, I2C, ADC, and timer peripherals in teaching projects, while 1 KB SRAM handles modest buffering. Estimated: at 5V/16 MHz the core draws about 3.6 mA, allowing USB-powered experimentation without heatsinking or power design effort.
おすすめ
Industrial Sensor Nodes
In factory automation, the ATMEGA8-16PU gathers analog data through its 10-bit ADC (8 multiplexed channels on port C) and reports over I2C, SPI, or UART to PLC-side gateways. The industrial-temperature ATMEGA8-16PI variant of the same die extends operation to -40C to +85C for electrical cabinets, while brown-out detection and the programmable watchdog timer guarantee recovery from supply dips common on noisy industrial 24V-derived rails. Read-while-write FLASH and 512 B EEPROM let the node store calibration constants and event counters that survive power loss without external non-volatile memory. Estimated: running from an internal 1 MHz RC oscillator at 5V cuts active current to roughly 0.3 mA, enabling battery-backed sensor pods with months of runtime.
おすすめ
PWM Motor Control
The ATMEGA8-16PU integrates three timer/counters - two 8-bit and one 16-bit - that generate hardware PWM for controlling DC motor drivers and small servo mechanisms. The 16-bit Timer1 offers complementary OC1A/OC1B outputs on PB1/PB2, enabling phase-correct and fast-PWM modes at 16 MHz resolution suitable for 10-bit PWM at several kHz carrier frequencies. Hardware PWM keeps timing deterministic independent of software load, which is essential in closed-loop speed control loops running over the UART. Combined with the 10-bit ADC for current or tachometer feedback sampling, the ATmega8 implements a complete single-chip motor controller. Using the -16 speed grade gives 16 MIPS of headroom for the control algorithm alongside PWM generation.
おすすめ
Embedded Control in Legacy Equipment Maintenance
Many production machines, test fixtures, and consumer appliances built in the 2000s carry an ATmega8 in a socketed 28-pin DIP. The ATMEGA8-16PU (or its revision-equivalent ATMEGA8A-PU) allows repair shops to service these boards without redesign: pull the socketed chip, reprogram it via SPI with extracted firmware, and return it to the socket. Pin compatibility with ATMEGA88-family parts also lets engineers future-proof obsolete inventories. The 512 B EEPROM preserves stored user settings during controller swaps, and the same crystal and reset circuitry is reused unchanged. Because the PDIP package withstands repeated socket insertions better than fine-pitch SMD, field servicing remains practical decades after original manufacture.
おすすめ
Battery-Powered Portable Devices
With power-down sleep current of approximately 0.5 uA per the Atmel datasheet and fully static operation down to 0 Hz, the ATMEGA8-16PU suits intermittent-duty portable products such as remote controls, metering probes, and data loggers. The L-suffix sibling ATMEGA8L-8PU extends the supply window to 2.7V-5.5V so the same footprint runs from two AA cells or a single lithium cell through a small regulator. The integrated internal RC oscillator eliminates the crystal and its two capacitors from the BOM in cost-sensitive battery designs at the cost of clock accuracy. Estimated: a node that wakes once per second for 1 ms of active work at 16 MHz averages well under 100 uA, giving months of life from alkaline cells.
おすすめ
LED Displays and Lighting Control
The ATMEGA8-16PU drives multiplexed LED matrices, seven-segment displays, and dimmable lighting using hardware PWM channels on port B (OC1A, OC1B, OC2) while ports C and D supply the 23 available I/O lines for row/column scanning. At 16 MHz, timer-sourced PWM achieves flicker-free dimming above the 100 Hz human-perception threshold even with 8-bit resolution, and gamma correction tables fit comfortably in the 8 KB FLASH. SPI mode (PB4/PB5/PB3) can chain external shift registers or LED driver ICs to expand channel counts without occupying additional MCU pins. The through-hole PDIP package simplifies hand assembly for one-off signage prototypes before committing to a production SMD layout.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: ATMEGA8-16PU — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | ATMEGA8A-PU | ATMEGA8-16PI | ATMEGA8L-8PU | ATMEGA88PA-PU | ATMEGA48PA-PU | ATMEGA48-20PI |
|---|---|---|---|---|---|---|---|
| Package | 28-PDIP | 28-PDIP - same | 28-PDIP - same | 28-PDIP - same | 28-PDIP - same | 28-PDIP - same | 28-PDIP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Max Clock Speed | 16 MHz | 16 MHz | 16 MHz | 8 MHz | 20 MHz | 20 MHz | 20 MHz |
| FLASH Memory | 8 KB | 8 KB | 8 KB | 8 KB | 8 KB | 4 KB | 4 KB |
| SRAM | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB | 512 B | 512 B |
| EEPROM | 512 B | 512 B | 512 B | 512 B | 512 B | 256 B | 256 B |
| Firmware Compatibility | Baseline (ATmega8) | Drop-in, no changes | Drop-in, no changes | Drop-in, clock derating | Port required (AVR094) | Port required | Port required |
主な差別化要因
- Zero-code-change replacement availability （vs ATMEGA88PA-PU)
- Higher throughput than L-grade sibling （vs ATMEGA8L-8PU)
- Double the program memory of ATmega48 family （vs ATMEGA48PA-PU)
- Trade-off: limited temperature range （vs ATMEGA8-16PI)
設計ノート
Place a 100 nF ceramic decoupling capacitor directly across VCC (pin 7) and GND (pin 8), as close to the pins as possible, plus a second 100 nF near AVCC (pin 20) to pin 22 GND. Tie AVCC to VCC through a 10 uH inductor or low-pass RC network when ADC accuracy matters. Connect AREF (pin 21) to ground through a 100 nF capacitor when using the internal reference, or drive it from a precision reference - never leave it floating.
The RESET pin (pin 1) is active-low and shared with PC6; a floating reset causes erratic startup. Use a 10 kohm pull-up to VCC and consider a 100 nF capacitor to ground for power-on-reset extension, or rely on the internal brown-out detector enabled via fuse bits. Fuse misconfiguration is the most common failure mode: disabling SPIEN or selecting the wrong clock source can brick the device in-circuit. Always program fuses with a programmer supporting high-voltage serial recovery for ATmega8.
When using an external 16 MHz crystal on XTAL1/XTAL2 (pins 9-10), select load capacitors per the crystal manufacturer specification (typically 12-22 pF) and keep crystal traces under 10 mm. ATmega8 fuse settings select full-swing or low-power oscillator mode; full-swing is required above 8 MHz for reliable startup. Avoid routing ADC traces (port C) parallel to UART or crystal lines to prevent crosstalk into the 10-bit ADC conversions.
コンプライアンス情報
RoHS compliant per Microchip product page; lead-free finish. REACH and conflict minerals status not stated in provided data.
