ATMEGA88-20PU - 8-bit AVR MCU 20MHz 8KB Flash | Microchip
MPN： ATMEGA88-20PU ✓ 啟用中ATMEGA88-20PU 概覽
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.
直接替換替代品，適用於 ATMEGA88-20PU — 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： ATMEGA88-20PU （相同外形與佔位） — 差異在於 Timers, Communication Interfaces, Package, EEPROM Size, Program Memory Type.
ATMEGA88PA-PU
✅ 直接替換聯絡詢價
查看資料表 →ATMEGA88P-20PU
✅ 直接替換📋 參考替代品（不在目錄中）
ATMEGA88-20PI
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATMEGA168-20PU
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATMEGA328P-PU
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATMEGA48V-10PU
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATMEGA8-16PI
✅ 直接替換聯絡詢價
查看資料表 →ATMEGA88-20PU 最大額定值與電氣特性
| Core Architecture | 8-bit AVR RISC |
| 最大時脈頻率 | 20 MHz |
| Flash Memory | 8 KB (4K x 16) ISP Flash |
| SRAM | 1 KB |
| EEPROM | 512 B |
| 供應電壓 | 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 |
| 封裝 | 28-PDIP |
| 安裝類型 | Through-Hole |
| Life Cycle Stage | ACTIVE |
| ISP Support | Yes, with read-while-write |
ATMEGA88-20PU 腳位配置
| 腳位 1 | PC6 (RESET) — Reset input / Port C bit 6 |
| 腳位 2 | PD0 (RXD) — USART receive / Port D bit 0 |
| 腳位 3 | PD1 (TXD) — USART transmit / Port D bit 1 |
| 腳位 4 | PD2 (INT0) — External interrupt 0 / Port D bit 2 |
| 腳位 5 | PD3 (INT1/OC2B) — External interrupt 1 / PWM output / Port D bit 3 |
| 腳位 6 | PD4 (T0/XCK) — Timer 0 clock input / USART external clock / Port D bit 4 |
| 腳位 7 | VCC — Digital supply voltage |
| 腳位 8 | GND — Ground |
| 腳位 9 | PB6 (XTAL1/TOSC1) — Crystal oscillator input / RTC oscillator / Port B bit 6 |
| 腳位 10 | PB7 (XTAL2/TOSC2) — Crystal oscillator output / RTC oscillator / Port B bit 7 |
| 腳位 11 | PD5 (OC0B/T1) — PWM output / Timer 1 external clock / Port D bit 5 |
| 腳位 12 | PD6 (OC0A/AIN0) — PWM output / analog comparator input / Port D bit 6 |
| 腳位 13 | PD7 (AIN1) — Analog comparator input / Port D bit 7 |
| 腳位 14 | PB0 (ICP1/CLKO) — Timer 1 input capture / system clock output / Port B bit 0 |
| 腳位 15 | PB1 (OC1A) — Timer 1 PWM output A / Port B bit 1 |
| 腳位 16 | PB2 (OC1B/SS) — Timer 1 PWM output B / SPI slave select / Port B bit 2 |
| 腳位 17 | PB3 (MOSI/OC2A) — SPI master output / Timer 2 PWM output / Port B bit 3 |
| 腳位 18 | PB4 (MISO) — SPI master input / Port B bit 4 |
| 腳位 19 | PB5 (SCK) — SPI serial clock / Port B bit 5 |
| 腳位 20 | AVCC — ADC supply voltage |
| 腳位 21 | AREF — ADC analog reference voltage |
| 腳位 22 | GND — Ground |
| 腳位 23 | PC0 (ADC0) — ADC input 0 / Port C bit 0 |
| 腳位 24 | PC1 (ADC1) — ADC input 1 / Port C bit 1 |
| 腳位 25 | PC2 (ADC2) — ADC input 2 / Port C bit 2 |
| 腳位 26 | PC3 (ADC3) — ADC input 3 / Port C bit 3 |
| 腳位 27 | PC4 (ADC4/SDA) — ADC input 4 / TWI data / Port C bit 4 |
| 腳位 28 | PC5 (ADC5/SCL) — ADC input 5 / TWI clock / Port C bit 5 |
典型應用
ATMEGA88-20PU 適用於 6 應用s: 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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
推薦產品摘要
工程參考資料，適用於 ATMEGA88-20PU — 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 | 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) |
主要差異化特點
- Lowest-cost active AVR in the 8 KB class with through-hole packaging (對比ATMEGA328P-PU)
- Standard die vs picoPower efficiency (對比ATMEGA88PA-PU)
- 20 MHz speed over legacy predecessors (對比ATMEGA8-16PI)
設計說明
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.
合規資訊
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.
