ATMEGA88-20AU - 8-Bit AVR MCU 8KB Flash 20MHz | Microchip
MPN: ATMEGA88-20AU ✓ Hoạt độngATMEGA88-20AU Tóm tắt
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data memory, and peripherals such as timers, serial interfaces, and analog-to-digital converters. The AVR family sits within the broader hierarchy of 8-bit MCUs, which in turn belong to the microcontroller class of embedded processors. The ATmega88 is built on Microchip's picoPower AVR RISC architecture, executing most instructions in a single clock cycle from 32 general-purpose working registers.
Key features include 8 KB ISP Flash with read-while-write capability, 1 KB SRAM, 512 B EEPROM, 23 general-purpose I/O lines, three flexible timer/counters with compare modes, an 8-channel 10-bit ADC, a programmable watchdog timer, and debugWIRE on-chip debugging. The device supports 20 MIPS at 20 MHz and offers multiple sleep modes for low-power operation.
The ATmega88 uses a Harvard architecture with separate program and data buses, allowing simultaneous instruction fetch and data access. Its 130-instruction set is optimized for C compiler efficiency, and the on-chip debugWIRE interface provides non-intrusive emulation using only the RESET pin, eliminating the need for a dedicated debug header.
Typical applications include consumer electronics, industrial control, battery management, sensor nodes, and legacy ATmega8 design migrations. The 32-TQFP package with 0.8 mm pitch suits automated assembly, and the wide 2.7-5.5 V supply range supports both 3.3 V and 5 V systems.
When designing with this device, decouple VCC and AVCC with 100 nF ceramic capacitors placed close to the pins, and connect the AREF pin through a low-impedance path when using the ADC. The RESET pin requires an external pull-up for reliable power-on reset.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, providing engineers with a single reference for selection, replacement, and layout decisions.
Bộ thay thế dễ dàng lắp đặt cho ATMEGA88-20AU — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với ATMEGA88-20AU (cùng hình factor và footprint) — khác nhau ở Package, RoHS Status, ADC, Timers, Operating Temperature.
ATMEGA88P-20AU
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATMEGA88A-AU
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATMEGA88-20AUR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ATMEGA88V-10AU
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATMEGA168-20AU
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATMEGA48-20AU
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATMEGA88-20AU Tỷ lệ tối đa & tính chất điện
| Core Architecture | 8-bit AVR RISC |
| Program Memory Size | 8 KB (4K x 16) Flash |
| SRAM | 1 KB |
| EEPROM | 512 B |
| Tần số xung maksimum | 20 MHz |
| Throughput | 20 MIPS at 20 MHz |
| Supply Voltage Range | 2.7 V to 5.5 V |
| General Purpose I/O Lines | 23 |
| General Purpose Working Registers | 32 |
| ADC Channels | 8-channel, 10-bit |
| Timer/Counters | Three flexible timer/counters with compare modes |
| Hộp | 32-TQFP (7x7 mm, 0.8 mm pitch) |
| Kiểu lắp đặt | Surface Mount |
| Nhiệt độ hoạt động | -40C to +85C |
| Instruction Set | 130 powerful instructions, most single-clock cycle |
| Debug Interface | debugWIRE on-chip debugging |
| Trạng thái RoHS | Compliant |
| Life Cycle Stage | ACTIVE |
Cấu hình chân ATMEGA88-20AU
| Chân 1 | PB0 — Port B, bit 0 (also ICP1) |
| Chân 2 | PB1 — Port B, bit 1 (also OC1A) |
| Chân 3 | PB2 — Port B, bit 2 (also SS/OC1B) |
| Chân 4 | PB3 — Port B, bit 3 (also MOSI/OC2A) |
| Chân 5 | PB4 — Port B, bit 4 (also MISO) |
| Chân 6 | PB5 — Port B, bit 5 (also SCK) |
| Chân 7 | PB6 — Port B, bit 6 (also XTAL1/TOSC1) |
| Chân 8 | PB7 — Port B, bit 7 (also XTAL2/TOSC2) |
| Chân 9 | RESET — Reset input (active low) |
| Chân 10 | VCC — Digital supply voltage |
| Chân 11 | GND — Ground |
| Chân 12 | XTAL2 — Crystal oscillator output |
| Chân 13 | XTAL1 — Crystal oscillator input |
| Chân 14 | PD0 — Port D, bit 0 (also RXD) |
| Chân 15 | PD1 — Port D, bit 1 (also TXD) |
| Chân 16 | PD2 — Port D, bit 2 (also INT0) |
| Chân 17 | PD3 — Port D, bit 3 (also INT1/OC2B) |
| Chân 18 | PD4 — Port D, bit 4 (also T0/XCK) |
| Chân 19 | PD5 — Port D, bit 5 (also T1/OC0B) |
| Chân 20 | PD6 — Port D, bit 6 (also AIN0/OC0A) |
| Chân 21 | PD7 — Port D, bit 7 (also AIN1) |
| Chân 22 | PC0 — Port C, bit 0 (also ADC0) |
| Chân 23 | PC1 — Port C, bit 1 (also ADC1) |
| Chân 24 | PC2 — Port C, bit 2 (also ADC2) |
| Chân 25 | PC3 — Port C, bit 3 (also ADC3) |
| Chân 26 | PC4 — Port C, bit 4 (also ADC4/SDA) |
| Chân 27 | PC5 — Port C, bit 5 (also ADC5/SCL) |
| Chân 28 | PC6 — Port C, bit 6 (also RESET) |
| Chân 29 | AREF — Analog reference voltage for ADC |
| Chân 30 | AVCC — Analog supply voltage for ADC |
| Chân 31 | GND — Ground |
| Chân 32 | PC7 — Port C, bit 7 (also ADC7) |
Ứng dụng tiêu biểu
ATMEGA88-20AU phù hợp cho 6 Áp dụngs: Consumer Electronics Control, Industrial Sensor Nodes, Battery-Powered Portable Devices, Legacy ATmega8 Design Migration, Motor and Actuator Control, Embedded Data Logging.
Consumer Electronics Control
The ATMEGA88-20AU fits consumer electronics control because its 8 KB Flash and 23 GPIO lines handle user-interface logic, button scanning, and LED driving without external glue logic. Running at 20 MHz for 20 MIPS, it executes control loops fast enough for appliance front panels and remote-control receivers. The 2.7-5.5 V supply range allows direct operation from either 3.3 V or 5 V rails, simplifying power architecture. Placed on a 32-TQFP footprint, it occupies only 7x7 mm, leaving board space for RF or display modules. A trade-off is that the 8 KB Flash limits complex menu systems; designs needing graphics or large lookup tables should migrate to the pin-compatible ATMEGA168-20AU with 16 KB Flash.
Được đề xuất
Industrial Sensor Nodes
The ATMEGA88-20AU suits industrial sensor nodes because its 8-channel 10-bit ADC digitizes analog transducer outputs directly, eliminating external ADC chips. The 23 GPIO lines interface with digital sensors, relays, and status LEDs, while three timer/counters generate precise PWM for actuator control. Operating from 2.7 V to 5.5 V, it tolerates the noisy supply rails common in factory automation. The debugWIRE interface allows in-circuit debugging through the RESET pin, reducing production connector cost. In a typical node, the MCU samples a temperature or pressure sensor at 1 kHz, filters the reading, and transmits over UART or SPI. The main limitation is the 1 KB SRAM, which constrains buffer-heavy protocols; designs with large data payloads should consider the ATMEGA168-20AU.
Được đề xuất
Battery-Powered Portable Devices
The ATMEGA88-20AU works in battery-powered portable devices because it operates down to 2.7 V, extending usable life from 3.7 V Li-ion cells, and offers multiple sleep modes that cut current between active periods. At 20 MHz it delivers 20 MIPS for responsive user interaction, then drops to microamp-level sleep to preserve charge. The 8 KB Flash stores application code plus a boot loader for field updates, and 512 B EEPROM retains calibration data without external memory. A typical design wakes the MCU on a button or timer interrupt, performs a measurement, updates a display, and returns to sleep. For the lowest possible current, the pin-compatible ATMEGA88P-20AU with picoPower technology is the better choice, reducing active and sleep currents further.
Được đề xuất
Legacy ATmega8 Design Migration
The ATMEGA88-20AU is a common migration target for legacy ATmega8 designs because Microchip application note AVR094 documents the conversion path and the two devices are pin compatible in the 32-pin TQFP package. The ATmega88 adds read-while-write Flash, more timer features, and a richer peripheral set while retaining the familiar AVR instruction set, so existing assembly or C code ports with minimal changes. The 8 KB Flash matches the ATmega8 capacity, and the 20 MHz speed grade preserves timing margins. Engineers migrating should re-validate fuse settings, interrupt vector tables, and register names that changed between families. For designs that outgrew the ATmega8, the pin-compatible ATMEGA168-20AU doubles Flash to 16 KB without a PCB change.
Được đề xuất
Motor and Actuator Control
The ATMEGA88-20AU handles motor and actuator control because its three timer/counters generate multiple independent PWM channels for H-bridge or stepper drivers, while the 10-bit ADC reads current-sense and position feedback signals. At 20 MHz, the control loop closes fast enough for small brushed DC motors and stepper positioning in printers, toys, and lab equipment. The 23 GPIO lines drive direction, enable, and fault signals directly. A typical implementation uses Timer1 in fast PWM mode for speed control and the ADC to monitor motor current for stall detection. The 8 KB Flash is adequate for trapezoidal or simple PID control; complex field-oriented control for BLDC motors would require the larger ATMEGA168-20AU or a dedicated motor-control MCU.
Được đề xuất
Embedded Data Logging
The ATMEGA88-20AU supports embedded data logging because its 512 B EEPROM stores calibration constants and configuration without external memory, while the 1 KB SRAM buffers sensor samples before writing to an external SPI Flash or SD card. The 8-channel 10-bit ADC captures analog inputs, and the UART or SPI interface streams logged data to a host. Running at 20 MHz, the MCU can sample and timestamp data at kilohertz rates. A typical logger wakes on a timer, reads several ADC channels, stores readings in a ring buffer, and periodically flushes to non-volatile storage. The 8 KB program Flash limits the complexity of on-device compression or file-system code; designs needing FAT file systems should use the pin-compatible ATMEGA168-20AU with 16 KB Flash.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ATMEGA88-20AU — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | ATMEGA88P-20AU | ATMEGA88A-AU | ATMEGA168-20AU | ATMEGA48-20AU |
|---|---|---|---|---|---|
| Package | 32-TQFP (7x7) | 32-TQFP (7x7) - same | 32-TQFP (7x7) - same | 32-TQFP (7x7) - same | 32-TQFP (7x7) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 8 KB | 8 KB | 8 KB | 16 KB | 4 KB |
| SRAM | 1 KB | 1 KB | 1 KB | 1 KB | 512 B |
| EEPROM | 512 B | 512 B | 512 B | 512 B | 256 B |
| Maximum Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Supply Voltage | 2.7 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| GPIO Lines | 23 | 23 | 23 | 23 | 23 |
| ADC Channels | 8-channel, 10-bit | 8-channel, 10-bit | 8-channel, 10-bit | 8-channel, 10-bit | 8-channel, 10-bit |
| Low-Power Technology | Standard AVR | picoPower | picoPower | Standard AVR | Standard AVR |
Bảo phân biệt quan trọng
- Standard AVR power profile vs picoPower (vsATMEGA88P-20AU)
- 8 KB Flash balance vs larger and smaller siblings (vsATMEGA168-20AU)
- 20 MHz speed grade vs 10 MHz V-variant (vsATMEGA88V-10AU)
Ghi chú thiết kế
Decouple both VCC (pin 10) and AVCC (pin 30) with 100 nF ceramic capacitors placed as close to the pins as possible, and add a 10 uF bulk capacitor on the board rail. AVCC must be connected even when the ADC is unused. For ADC accuracy, connect AREF through a low-impedance path and avoid sharing the analog ground return with high-current digital traces. Estimated: at 20 MHz and 5 V, core current is on the order of several milliamps, so a 100 nF decoupling capacitor per supply pin is sufficient for typical loads.
Route the crystal between XTAL1 (pin 13) and XTAL2 (pin 12) with the shortest possible traces and place the load capacitors symmetrically to ground. Keep the crystal away from switching nodes and clock lines. The RESET pin (pin 9) requires an external pull-up resistor, typically 10 kOhm, and a 100 nF capacitor to ground for noise immunity. The debugWIRE interface shares the RESET pin, so ensure the programmer can drive it without contention from the pull-up.
Do not leave AVCC unconnected, as this can cause erratic ADC readings and increased current consumption. Verify the fuse settings for the clock source before production; the default factory fuse may select the internal 8 MHz oscillator rather than an external crystal. When migrating from ATmega8, re-check interrupt vector addresses and register names, as Microchip application note AVR094 documents several differences. Always confirm the speed-grade voltage curve in the manufacturer datasheet, since the 20 MHz rating may require a higher minimum supply than the 2.7 V absolute minimum.
Thông tin tuân thủ
RoHS compliance is indicated by distributor listings. REACH, halogen-free, and conflict-minerals status were not stated in the provided data and are marked unknown. The device is not AEC-Q100 qualified; automotive designs should use an automotive-grade variant.
