ATMEGA88-20PU - 8-bit AVR MCU 20MHz 8KB Flash | Microchip
MPN: ATMEGA88-20PU ✓ فعالATMEGA88-20PU نمای کلی
An 8-bit microcontroller (MCU) is a self-contained computing chip integrating a processor core, program memory, data memory, and peripherals such as timers, ADCs, and serial interfaces on a single die. Microcontrollers sit within the broader power-management and embedded-control hierarchy, executing dedicated firmware tasks in everything from appliances to industrial sensors.
Key features include the advanced AVR RISC architecture with 130 powerful instructions, most executing in a single clock cycle, plus 32 general-purpose working registers. The device supports In-System Programming (ISP) with read-while-write capability and debugWIRE on-chip debugging, which requires only a single I/O pin and the reset line for in-circuit debugging and ICSP programming.
Architecturally, the ATMEGA88 combines a Harvard-structure AVR core with three flexible timers/counters with compare modes, internal and external interrupts, a byte-oriented two-wire serial interface (TWI/I2C), a USART, and an SPI serial port. Six sleep modes, including the picoPower-class power-save modes in later P/PA variants, enable very low average power consumption in battery designs.
Typical applications include hobby and educational embedded boards (the MiniCore Arduino package supports the ATmega88 family), industrial sensor nodes, motor-control front ends using the 10-bit ADC, and consumer appliance control panels. The DIP-28 package makes it especially popular for prototyping, breadboarding, and legacy through-hole production lines.
Design consideration: at 20 MHz operation the supply voltage must be 4.5 V to 5.5 V; below 4.5 V the maximum clock frequency derates per the datasheet speed-grade curve, so designs targeting 3.3 V operation should choose a lower-speed grade such as ATMEGA88-15.
This page synthesizes distributor pricing, verified drop-in alternatives, pinout data, and practical design notes beyond what the manufacturer datasheet alone provides.
جایگزین‌های drop-in برای ATMEGA88-20PU — همان پکیج، سازگار پین‌به‌پین. قطعات با پکیج متفاوت که نیاز به تغییر PCB دارند مستثنی هستند.
گونه‌ها در این سری
مدل‌های هم‌سری که جایگزین مستقیم هستند برای ATMEGA88-20PU (همان فرم‌فاکتور و فوت‌پرینت) — متفاوت در Timers, Communication Interfaces, Package, EEPROM Size, Program Memory Type.
ATMEGA88PA-PU
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←ATMEGA88P-20PU
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
ATMEGA88-20PI
✅ جایگزین مستقیم ⚠️ مشخصات تأییدنشدهبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←ATMEGA168-20PU
✅ جایگزین مستقیم ⚠️ مشخصات تأییدنشدهبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←ATMEGA328P-PU
✅ جایگزین مستقیم ⚠️ مشخصات تأییدنشدهبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←ATMEGA48V-10PU
✅ جایگزین مستقیم ⚠️ مشخصات تأییدنشدهبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←ATMEGA8-16PI
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←ATMEGA88-20PU حداکثر مقادیر مجاز و مشخصات الکتریکی
| Core Architecture | 8-bit AVR RISC |
| حداکثر فرکانس کلاک | 20 MHz |
| Flash Memory | 8 KB (4K x 16) ISP Flash |
| SRAM | 1 KB |
| EEPROM | 512 B |
| ولتاژ تغذیه | 4.5 V to 5.5 V (at 20 MHz) |
| Operating Voltage Range (family) | 2.7 V to 5.5 V |
| I/O Pins | 23 |
| ADC | 8-channel, 10-bit |
| Timers | Two 8-bit, one 16-bit |
| Communication Interfaces | USART, SPI, TWI (I2C) |
| Instruction Set | 130 instructions, mostly single-cycle |
| Debug Interface | debugWIRE on-chip debugging |
| بسته‌بندی | 28-PDIP |
| نوع نصب | Through-Hole |
| Life Cycle Stage | ACTIVE |
| ISP Support | Yes, with read-while-write |
پیکربندی پین ATMEGA88-20PU
| پین 1 | PC6 (RESET) — Reset input / Port C bit 6 |
| پین 2 | PD0 (RXD) — USART receive / Port D bit 0 |
| پین 3 | PD1 (TXD) — USART transmit / Port D bit 1 |
| پین 4 | PD2 (INT0) — External interrupt 0 / Port D bit 2 |
| پین 5 | PD3 (INT1/OC2B) — External interrupt 1 / PWM output / Port D bit 3 |
| پین 6 | PD4 (T0/XCK) — Timer 0 clock input / USART external clock / Port D bit 4 |
| پین 7 | VCC — Digital supply voltage |
| پین 8 | GND — Ground |
| پین 9 | PB6 (XTAL1/TOSC1) — Crystal oscillator input / RTC oscillator / Port B bit 6 |
| پین 10 | PB7 (XTAL2/TOSC2) — Crystal oscillator output / RTC oscillator / Port B bit 7 |
| پین 11 | PD5 (OC0B/T1) — PWM output / Timer 1 external clock / Port D bit 5 |
| پین 12 | PD6 (OC0A/AIN0) — PWM output / analog comparator input / Port D bit 6 |
| پین 13 | PD7 (AIN1) — Analog comparator input / Port D bit 7 |
| پین 14 | PB0 (ICP1/CLKO) — Timer 1 input capture / system clock output / Port B bit 0 |
| پین 15 | PB1 (OC1A) — Timer 1 PWM output A / Port B bit 1 |
| پین 16 | PB2 (OC1B/SS) — Timer 1 PWM output B / SPI slave select / Port B bit 2 |
| پین 17 | PB3 (MOSI/OC2A) — SPI master output / Timer 2 PWM output / Port B bit 3 |
| پین 18 | PB4 (MISO) — SPI master input / Port B bit 4 |
| پین 19 | PB5 (SCK) — SPI serial clock / Port B bit 5 |
| پین 20 | AVCC — ADC supply voltage |
| پین 21 | AREF — ADC analog reference voltage |
| پین 22 | GND — Ground |
| پین 23 | PC0 (ADC0) — ADC input 0 / Port C bit 0 |
| پین 24 | PC1 (ADC1) — ADC input 1 / Port C bit 1 |
| پین 25 | PC2 (ADC2) — ADC input 2 / Port C bit 2 |
| پین 26 | PC3 (ADC3) — ADC input 3 / Port C bit 3 |
| پین 27 | PC4 (ADC4/SDA) — ADC input 4 / TWI data / Port C bit 4 |
| پین 28 | PC5 (ADC5/SCL) — ADC input 5 / TWI clock / Port C bit 5 |
کاربردهای معمول
ATMEGA88-20PU مناسب است برای 6 کاربردs: Hobby and Educational Embedded Boards, Industrial Sensor Nodes, Motor Control and PWM Front Ends, Consumer Appliance Control Panels, Legacy Through-Hole Repair and Replacement, Battery-Powered Portable Instruments.
Hobby and Educational Embedded Boards
The ATMEGA88-20PU fits hobby and educational embedded platforms because its 28-pin PDIP through-hole package solders easily into breadboards and perfboards, and its 8 KB Flash accommodates compact Arduino-style sketches via the MiniCore hardware package. Running at 20 MIPS, it handles LED multiplexing, button scanning, and small display drivers with plenty of headroom. ICSP programming through the SPI pins (PB3-PB5) allows re-flashing in-circuit, while debugWIRE gives students step-by-step debugging with a single-wire Atmel-ICE connection at minimal cost.
پیشنهادی
Industrial Sensor Nodes
The ATMEGA88-20PU's 8-channel 10-bit ADC and TWI/I2C interface make it well suited to industrial sensor acquisition nodes reading analog transducers and digital sensors alike. The USART links nodes to RS-485 transceivers for multi-drop networks, and EEPROM stores calibration constants across power cycles. Its 2.7-5.5 V family tolerance accommodates noisy industrial 5 V rails, and watchdog plus brown-out detection maintain reliability. For low-duty-cycle battery-backed nodes, the pin-compatible ATMEGA88PA-PU extends life with picoPower sleep currents.
پیشنهادی
Motor Control and PWM Front Ends
With two 8-bit timers and one 16-bit timer featuring compare modes, the ATMEGA88-20PU generates multiple synchronized PWM channels for DC motor and small servo control at 20 MHz resolution-timed output. The 10-bit ADC reads back current-sense or tachometer feedback for closed-loop speed regulation, while external interrupts capture encoder edges. Designers typically drive a MOSFET H-bridge through the 23 I/O lines with appropriate gate drivers; the 5 V logic levels interface directly with common driver ICs, simplifying the power stage design.
پیشنهادی
Consumer Appliance Control Panels
Consumer appliance controllers benefit from the ATMEGA88-20PU's combination of low cost (about $1.34 as of 2026-09-19), 512 B EEPROM for user settings and fault logs, and enough Flash for menu logic, keypad scanning, and display multiplexing. The TWI bus drives RTC and EEPROM companion chips, while the USART supports service-port diagnostics. Through-hole PDIP packaging simplifies low-volume assembly and rework in appliance service ecosystems, and the active lifecycle status guarantees long-term replacement availability for repair inventories.
پیشنهادی
Legacy Through-Hole Repair and Replacement
Service organizations maintaining legacy equipment rely on the ATMEGA88-20PU because its PDIP socket format allows solderless replacement in boards designed decades ago. Microchip application note AVR094 documents ATmega8-to-ATmega88 migration, and the family's pin compatibility with ATmega48/168/328 lets repairers substitute available variants when exact SKUs are scarce, adjusting fuses and code where necessary. DigiKey's cross-reference tool lists parametrically similar parts, and the active lifecycle status of the 20PU keeps this supply chain open today.
پیشنهادی
Battery-Powered Portable Instruments
Portable instruments use the ATmega88 family's six sleep modes to cut average current dramatically: idle between measurements and waking the 20 MHz core only for ADC conversions and display updates. The ATMEGA88PA-PU variant extends this further with picoPower technology and a 1.8 V floor, enabling operation from two alkaline cells with a boost-free 3 V rail at reduced clock speed. The 10-bit ADC reads battery voltage for fuel-gauging, and EEPROM retains user calibration through battery swaps, making the family a proven portable-instrument controller.
پیشنهادی
خلاصه محصولات پیشنهادی
داده‌های مرجع مهندسی برای ATMEGA88-20PU — مقایسه، راهنمای طراحی و اطلاعات انطباق.
راهنمای انتخاب
مقایسه با جایگزین‌ها
| پارامتر | این محصول | ATMEGA88PA-PU | ATMEGA88P-20PU | ATMEGA168-20PU | ATMEGA328P-PU | ATMEGA8-16PI |
|---|---|---|---|---|---|---|
| Package | 28-PDIP | 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 |
| Flash Memory | 8 KB | 8 KB | 8 KB | 16 KB | 32 KB | 8 KB |
| SRAM | 1 KB | 1 KB | 1 KB | 1 KB | 2 KB | 1 KB |
| Max Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 16 MHz |
| Supply Voltage Range | 2.7 V to 5.5 V (4.5-5.5 V at 20 MHz) | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 2.7 V to 5.5 V | 1.8 V to 5.5 V | 4.0 V to 5.5 V |
| EEPROM | 512 B | 512 B | 512 B | 512 B | 1 KB | 512 B |
| Low-Power Features | Six sleep modes (standard die) | picoPower, lowest sleep current | picoPower | Six sleep modes | picoPower | Five sleep modes (older die) |
تفاوت‌های کلیدی
- Lowest-cost active AVR in the 8 KB class with through-hole packaging (در مقابلATMEGA328P-PU)
- Standard die vs picoPower efficiency (در مقابلATMEGA88PA-PU)
- 20 MHz speed over legacy predecessors (در مقابلATMEGA8-16PI)
یادداشت‌های طراحی
Match clock speed to supply voltage. The -20 speed grade requires 4.5-5.5 V for 20 MHz operation; running near the voltage floor at full speed risks marginal timing. If your rail is 3.3 V, derate the clock per the datasheet frequency-vs-VCC curve or pick a wide-voltage variant such as ATMEGA88PA-PU. Decouple VCC and AVCC each with 100 nF ceramics placed within 5 mm of the pins, and tie AVCC to VCC through a low-pass LC filter when ADC accuracy matters, keeping analog ground returns separate from the digital ground path.
On the PDIP-28 part, pin 1 (/RESET) needs a 10 kOhm pull-up to VCC for noise immunity; debugWIRE shares this pin, so a series resistor around 10 kOhm between the debug connector and RESET may be required if ISP and debugWIRE are both used. Reserve the SPI header (PB3/PB4/PB5 plus RESET and GND) on every board even in production, enabling field firmware updates without desoldering. XTAL1/XTAL2 crystals should sit within 10 mm of pins 9-10 with 12-22 pF load capacitors per the crystal datasheet.
Fuse misconfiguration is the most common ATmega88 failure mode: setting SPIEN off, selecting the wrong clock source, or enabling RSTDISBL locks out further ISP programming. Always program fuses with an verified ISP programmer and verify before closing production. Also note that if you swap in an ATMEGA328P-PU or ATMEGA88PA-PU, the device signature differs and recompiled firmware plus adjusted fuse defaults (e.g., BOD level options) are required - drop-in refers to hardware, not binaries.
اطلاعات انطباق
Life Cycle Stage: ACTIVE per digchip datasheet listing. Current Microchip catalog production is RoHS/lead-free; obtain formal RoHS/REACH certificates from the Microchip product page for regulatory documentation.
