ATMEGA88A-MU - 8-bit AVR MCU, 8KB Flash 20MHz | Microchip (Tape & Reel)
MPN: ATMEGA88A-MU ✓ Hoạt độngATMEGA88A-MU Tóm tắt
An 8-bit AVR microcontroller is a complete self-contained computing system on a single chip, combining a RISC processor core, program memory, SRAM, EEPROM, timers, and analog peripherals such as ADC and analog comparators. Microcontrollers sit at the lowest level of the embedded systems hierarchy: microcontroller -> embedded processor -> MCU families like the AVR ATmega series, which are programmed in C or assembly through development tools such as MPLAB X and AVR-GCC, and debugged in-circuit via ICSP using tools like the MPLAB SNAP.
Key features of the ATMEGA88A include 8KB ISP Flash with read-while-write capability, 512B EEPROM, 1KB SRAM, 23 general-purpose I/O lines, and 32 general-purpose working registers. The AVR enhanced RISC core executes 130 powerful instructions, most in a single clock cycle, delivering up to 20 MIPS throughput at 20MHz. The picoPower technology provides multiple sleep modes with very low active and idle power consumption.
The ATmega88A architecture includes three flexible timers/counters with compare modes (two 8-bit and one 16-bit), internal and external interrupt sources, a serial programmable USART, an SPI serial interface, a two-wire interface (I2C-compatible), an 8-channel 10-bit ADC with differential mode, and an internal calibrated RC oscillator. The wide supply voltage range of 1.8V to 5.5V supports battery-powered designs as well as 5V industrial systems.
Typical applications include industrial automation and sensor nodes, home appliance and HVAC control boards, and battery-powered portable devices where low standby power matters. The 32-VQFN (5x5 mm) package saves board area versus TQFP while retaining full peripheral access.
When designing with this device, reserve the PC6/RESET pin for in-circuit serial programming and follow the datasheet power-supply decoupling recommendations for the exposed pad.
This page synthesizes verified distributor pricing, drop-in alternatives, pinout data, and practical design notes not consolidated in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho ATMEGA88A-MU — 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 ATMEGA88A-MU (cùng hình factor và footprint) — khác nhau ở Package, Operating Temperature, Timers/Counters, Flash Memory, Supply Voltage Range.
ATMEGA88PA-MUR
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATMEGA88-20MU
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATMEGA168A-MUR
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ATMEGA48PA-MUR
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ATMEGA88A-MU Tỷ lệ tối đa & tính chất điện
| Core Architecture | 8-bit AVR RISC |
| Program Memory Size | 8 KB (4K x 16) Flash |
| EEPROM Size | 512 B |
| SRAM Size | 1 KB |
| Maximum Clock Speed | 20 MHz |
| Supply Voltage Range | 1.8 V to 5.5 V |
| General Purpose I/O | 23 I/O lines |
| Working Registers | 32 x 8-bit |
| ADC Resolution | 10-bit, 8 channels |
| Timers/Counters | Two 8-bit, one 16-bit |
| Communication Interfaces | USART, SPI, TWI (I2C-compatible) |
| Hộp | 32-VQFN (5x5 mm) with exposed pad |
| Kiểu lắp đặt | Surface Mount |
| Nhiệt độ hoạt động | -40C to +85C (industrial) |
| Sleep Modes / Power Technology | picoPower, multiple sleep modes |
| Trạng thái RoHS | Compliant (green package) |
| Debug / Programming | ICSP via MPLAB SNAP (debugWIRE) |
Cấu hình chân ATMEGA88A-MU
| Chân 1 | PD3 — Port D, bit 3 (GPIO / analog comparator negative input) |
| Chân 2 | PD4 — Port D, bit 4 (GPIO / analog comparator positive input) |
| Chân 3 | GND — Ground |
| Chân 4 | VCC — Digital supply voltage |
| Chân 5 | GND — Ground |
| Chân 6 | VCC — Digital supply voltage |
| Chân 7 | PB6/XTAL1/TOSC1 — Port B bit 6 / crystal oscillator input / timer oscillator input |
| Chân 8 | PB7/XTAL2/TOSC2 — Port B bit 7 / crystal oscillator output / timer oscillator output |
| Chân 9 | PD5 — Port D, bit 5 (GPIO) |
| Chân 10 | PD6 — Port D, bit 6 (GPIO) |
| Chân 11 | PD7 — Port D, bit 7 (GPIO) |
| Chân 12 | PB0 — Port B, bit 0 (GPIO / ICP1 input capture) |
| Chân 13 | PB1 — Port B, bit 1 (GPIO / OC1A PWM output) |
| Chân 14 | PB2 — Port B, bit 2 (GPIO / SS SPI slave select) |
| Chân 15 | PB3/MOSI/OC2A — Port B bit 3 / SPI master output / Timer2 PWM output |
| Chân 16 | PB4/MISO — Port B bit 4 / SPI master input |
| Chân 17 | PB5/SCK — Port B bit 5 / SPI clock |
| Chân 18 | AVCC — ADC supply voltage |
| Chân 19 | ADC6 — ADC input channel 6 |
| Chân 20 | AREF — ADC analog reference |
| Chân 21 | GND — Ground |
| Chân 22 | ADC7 — ADC input channel 7 |
| Chân 23 | PC0/ADC0 — Port C bit 0 / ADC channel 0 |
| Chân 24 | PC1/ADC1 — Port C bit 1 / ADC channel 1 |
| Chân 25 | PC2/ADC2 — Port C bit 2 / ADC channel 2 |
| Chân 26 | PC3/ADC3 — Port C bit 3 / ADC channel 3 |
| Chân 27 | PC4/ADC4/SDA — Port C bit 4 / ADC channel 4 / TWI data |
| Chân 28 | PC5/ADC5/SCL — Port C bit 5 / ADC channel 5 / TWI clock |
| Chân 29 | PC6/RESET — Reset input / debugWIRE pin |
| Chân 30 | PD0/RXD — Port D bit 0 / USART receive |
| Chân 31 | PD1/TXD — Port D bit 1 / USART transmit |
| Chân 32 | PD2/INT0 — Port D bit 2 / external interrupt 0 |
Ứng dụng tiêu biểu
ATMEGA88A-MU phù hợp cho 6 Áp dụngs: Industrial Automation and Sensor Nodes, Home Appliance Control, Battery-Powered Portable Devices, Motor Control (Small DC and Stepper), Embedded HMI and Display Control, Hobby, Maker, and Educational Boards.
Industrial Automation and Sensor Nodes
The ATMEGA88A-MU fits factory floor sensor nodes because its industrial temperature rating, 1.8V to 5.5V supply tolerance, and 10-bit ADC allow direct connection of analog transducers without external conversion. The SPI and TWI interfaces link to external EEPROM or network transceivers, while the 16-bit Timer/Counter1 generates PWM for actuator control. Its picoPower sleep modes let battery-backed nodes idle at microamp-level current between polling cycles. With 8KB Flash, a Modbus-style UART protocol plus sensor conditioning firmware fits comfortably; if the application grows, the pin-compatible ATMEGA168A-MUR doubles program memory with no PCB change.
Được đề xuất
Home Appliance Control
Appliance and HVAC control boards benefit from the ATMEGA88A-MU's robust 5V operation, 23 GPIO lines, and multiple PWM-capable timers. A typical design drives triac or relay outputs from GPIO, reads NTC temperature sensors through the 10-bit ADC, and handles user buttons and LED indicators on the remaining ports. The internal calibrated RC oscillator removes the crystal from cost-sensitive boards, and the watchdog timer plus brown-out detection improve safety in mains-powered environments. Because 20 MIPS at 20MHz is far above the compute need of most appliance loops, the core spends most time in idle sleep, reducing conducted EMI and power consumption on standby rails.
Được đề xuất
Battery-Powered Portable Devices
For portable and coin-cell powered products, the ATMEGA88A-MU's picoPower architecture with multiple sleep modes and a 1.8V low-end supply range extends battery life. The device wakes from sleep on external interrupts or watchdog timeouts, samples a sensor through the 10-bit ADC, and transmits over USART or TWI before returning to sleep. Operating at reduced clock near 1.8V keeps the system within the frequency-versus-VCC safe operating curve. The 512B EEPROM preserves calibration data through battery replacement. Designers targeting maximum sleep efficiency should consider the pin-compatible ATMEGA88PA-MUR, whose P-die further reduces active and idle consumption.
Được đề xuất
Motor Control (Small DC and Stepper)
The ATMEGA88A-MU controls small DC motors and steppers using PWM outputs from its 8-bit and 16-bit timers driving external MOSFET or H-bridge drivers. The 10-bit differential ADC reads shunt current or back-EMF feedback, and input capture on Timer1 can decode encoder or Hall signals with hardware timestamping. At 20MHz, a closed-loop PI controller runs at kilohertz rates with large margin. The wide 1.8V to 5.5V supply allows the MCU to share the logic rail of the gate driver. For applications requiring CAN or a programmable serial controller, Microchip's ATmega64M1 family provides an upgrade path within the same AVR ecosystem.
Được đề xuất
Embedded HMI and Display Control
The ATMEGA88A-MU serves as a keypad scanner and display controller for small embedded HMIs. Twenty-three GPIO lines drive a multiplexed seven-segment or character LCD arrangement and read a matrix keypad, while the USART or TWI port talks to a host processor or an OLED driver chip. Its 8KB Flash comfortably holds a lookup-table font, menu state machine, and serial protocol. The 16-bit timer generates backlight PWM dimming with hardware, offloading the core. In a typical split-HMI architecture, this MCU handles the real-time user interface locally while sleeping in idle mode between key events, keeping standby draw low on always-on appliances.
Được đề xuất
Hobby, Maker, and Educational Boards
The ATMEGA88A family is a staple of maker and educational platforms because it is inexpensive, programmable via a low-cost ISP cable or MPLAB SNAP, and supported by the mature AVR-GCC and Arduino-compatible toolchains. The 32-VQFN (5x5 mm) MUR variant suits compact student PCBs, while the same silicon in DIP (ATMEGA88A-PU) supports breadboard teaching. The debugWIRE feature enables single-wire in-circuit debugging on the reset pin, which teaches professional workflows without extra pins. The internal RC oscillator, power-on reset, and brown-out detector mean a minimal working board needs only decoupling capacitors - ideal for first embedded design coursework.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ATMEGA88A-MU — 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 | ATMEGA88PA-MUR | ATMEGA88A-MU | ATMEGA88-20MU | ATMEGA168A-MUR | ATMEGA48PA-MUR |
|---|---|---|---|---|---|---|
| Package | 32-VQFN (5x5 mm) | 32-VQFN (5x5 mm) - same | 32-VQFN (5x5 mm) - same | 32-VQFN (5x5 mm) - same | 32-VQFN (5x5 mm) - same | 32-VQFN (5x5 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory (Flash) | 8 KB | 8 KB | 8 KB | 8 KB | 16 KB | 4 KB |
| SRAM | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB | 512 B |
| EEPROM | 512 B | 512 B | 512 B | 512 B | 512 B | 256 B |
| Maximum Clock Speed | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Supply Voltage Range | 1.8 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 (per original die) | 1.8 V to 5.5 V | 1.8 V to 5.5 V |
| Power Optimization | picoPower-class (A revision) | picoPower (P die) - lowest current | picoPower-class (A revision) | original die, higher sleep current | picoPower-class (A revision) | picoPower (P die) |
| Packaging Format | Tape & Reel (R suffix) | Tape & Reel | Standard tray/tube qty | Standard tray/tube qty | Tape & Reel | Tape & Reel |
Bảo phân biệt quan trọng
- picoPower sleep architecture (vsATMEGA88-20MU)
- Upgrade path to double Flash without PCB change (vsATMEGA168A-MUR)
- Cost reduction path for simpler firmware (vsATMEGA48PA-MUR)
- Automated assembly packaging (vsATMEGA88A-MU)
Ghi chú thiết kế
Clock frequency must derate with supply voltage: full 20MHz operation is only guaranteed at 4.5V to 5.5V per the ATmega88A datasheet frequency-versus-VCC curve. If your design runs at 3.3V, limit the system clock to the curve's safe region (roughly 10MHz class) or accept a fuse-verified lower clock. Enable the brown-out detector (BOD) via fuses so the MCU does not execute code corruptly during supply droop - critical in 5V appliance designs with slow-railing power supplies.
Connect AVCC (pin 18) to VCC through a low-pass RC network (typical 10 ohm / 100 nF) when ADC accuracy matters, and keep analog traces to ADC0-7 and AREF away from the SPI and USART switching lines. The exposed pad on the 32-VQFN should be soldered to a ground pour for mechanical reliability and thermal dissipation - it is the main ground return for the die. Place 100 nF decoupling capacitors at both VCC pins (4 and 6) within 2 mm of the pads.
PC6/RESET is used by debugWIRE for in-circuit debugging; do not connect external pull-up circuitry that fights the single-wire debug driver until firmware is stable. Reserve the 6-pin ICSP header (VCC, GND, RESET, SCK PB5, MOSI PB3, MISO PB4) on every production board, since field firmware updates require it. Also remember the A-revision fuse defaults: clock source fuses must be programmed before switching from the internal RC oscillator to external crystal, or the device may become unreachable.
At 20MHz and 5V with all 23 GPIOs driving capacitive loads, estimated dynamic current can approach the datasheet active-mode maximum, but the 32-VQFN exposed pad with a solid ground pour keeps junction rise minimal (well under 20C at typical 50 mA-class consumption, using estimated theta_JA values in still air). No heatsinking is required for normal operation; the main thermal consideration is solder-joint quality on the exposed pad, verified by X-ray for high-reliability assemblies.
Thông tin tuân thủ
Distributor listings identify the package as Green (Microchip green designation, per FindIC listing: MLF/QFN, Ind Temp, Green, T&R). REACH and conflict minerals status not stated in provided data.
