ATMEGA88A-MMH - 8-bit AVR MCU 8KB Flash 20MHz VQFN-28 | Microchip
MPN： ATMEGA88A-MMH ✓ 啟用中ATMEGA88A-MMH 概覽
A microcontroller unit (MCU) is a single-chip computer that integrates a processor core, program memory, data memory, and peripherals on one die, sitting at the device level of the embedded-systems hierarchy (MCU -> embedded processor -> embedded system). The AVR family popularized single-cycle RISC execution, and this ATmega88A variant belongs to the entry-level ATmega line that bridges tinyAVR and megaAVR parts such as the ATmega328P.
Key features include the advanced RISC architecture with 130 powerful instructions, most executed in a single clock cycle, plus 32 general-purpose working registers. Peripherals include three flexible timer/counters with compare modes, internal and external interrupt sources, a 10-bit ADC, USART, SPI, and two-wire (I2C) serial interfaces. The picoPower technology delivers low active and sleep-mode consumption, supporting battery-powered designs.
Architecturally, the Harvard-structure AVR core fetches instructions and data over separate buses, enabling the 20 MHz single-cycle operation. In-system programmable Flash with read-while-write support allows firmware updates in the field through SPI or a boot loader.
Typical applications include consumer appliance control, industrial sensor nodes, battery-powered metering, and hobby/education boards, where the small 4x4 mm footprint and rich peripheral set fit space-constrained PCBs.
Design consideration: the VQFN exposed pad should be soldered to a grounded copper pour for both thermal dissipation and signal-integrity, and the 8 KB Flash ceiling should be budgeted early if C libraries such as floating-point math are required.
This page adds value beyond the datasheet by consolidating verified distributor pricing (as of 2026-09-19), drop-in same-package alternatives, and practical design guidance for the ATMEGA88A-MMH.
直接替換替代品，適用於 ATMEGA88A-MMH — 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： ATMEGA88A-MMH （相同外形與佔位） — 差異在於 Package, Communication Interfaces, EEPROM, SRAM, Flash Memory.
ATMEGA88PA-MMH
✅ 直接替換📋 參考替代品（不在目錄中）
ATMEGA48A-MMH
✅ 直接替換聯絡詢價
查看資料表 →ATMEGA48PA-MMH
✅ 直接替換📋 參考替代品（不在目錄中）
ATMEGA168A-MMHR
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATMEGA168PA-MMH
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ATMEGA328P-MMH
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATMEGA88A-MMH 最大額定值與電氣特性
| Core | AVR 8-bit RISC |
| Core Size | 8-bit |
| 最大時脈頻率 | 20 MHz |
| Program Memory Size | 8 KB (4K x 16) FLASH |
| Program Memory Type | ISP FLASH (read-while-write) |
| EEPROM Size | 512 B |
| SRAM Size | 1 KB |
| Number of I/O | 23 general-purpose I/O lines |
| General Purpose Working Registers | 32 |
| Instruction Set | 130 powerful instructions, most single-cycle |
| Timers | Three flexible timer/counters with compare modes |
| Communication Interfaces | USART, SPI, 2-wire serial (I2C) |
| Low Power Technology | picoPower |
| 封裝 | 28-VQFN (4x4 mm) with exposed pad |
| 安裝類型 | Surface Mount |
| Life Cycle Stage | Active |
| Programming Method | In-System Programmable (ISP) |
ATMEGA88A-MMH 28-vqfn (4x4 mm) with exposed pad 腳位配置指南
ATMEGA88A-MMH（28-vqfn (4x4 mm) with exposed pad 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： ATMEGA88A-MMH.
請參閱 資料表 以查看完整腳位配置。
典型應用
ATMEGA88A-MMH 適用於 6 應用s: Consumer Appliance Control, Battery-Powered Sensor Nodes, Industrial Sensor and Actuator Interfaces, Hobby, Education and Prototyping Boards, LED Lighting and Dimming Control, Metering and Data Logging.
Consumer Appliance Control
The ATMEGA88A-MMH fits white-goods and small-appliance control boards because its 8 KB Flash is sufficient for keypad scanning, display driving, and relay sequencing state machines written in C, while 512 B EEPROM retains user settings across power cycles. The three timer/counters with compare modes generate PWM for motor or heater control directly in hardware, offloading the CPU. Its 4x4 mm VQFN package with exposed pad saves board area in cost-driven consumer PCBs, and the 23 GPIO lines cover button matrices, LEDs, and AC-zero-cross sensing without port expanders. Running at 20 MHz, interrupt latency is short enough for responsive user interfaces, and the on-chip oscillator removes the need for an external crystal in non-timing-critical products.
推薦
Battery-Powered Sensor Nodes
picoPower technology makes the ATMEGA88A-MMH appropriate for battery-operated sensor nodes that spend most of their life in sleep mode. The device wakes on external interrupt or timer overflow, takes a 10-bit ADC reading from a sensor such as a temperature or humidity element, and transmits over SPI or I2C to a radio module before returning to a low-current sleep state. With 1 KB SRAM there is room for packet buffers and simple filtering, and the 8 KB Flash holds a full sensor driver plus communication stack. The USART interface connects directly to off-the-shelf RF modules, and EEPROM calibration constants survive battery replacement. Selecting the ATMEGA88PA-MMH in the identical package further reduces sleep current for multi-year coin-cell deployments.
推薦
Industrial Sensor and Actuator Interfaces
In factory automation, the ATMEGA88A-MMH serves as a local intelligence node bridging analog sensors to a PLC or supervisory controller. The 10-bit ADC digitizes 0-10 V or 4-20 mA conditioned signals, timers produce PWM for valve or drive control, and the USART or SPI links to isolated RS-485 transceivers. Its industrial-grade operating envelope and read-while-write Flash allow field firmware updates without desoldering. The 4x4 mm VQFN exposed pad solders to a ground pour, improving noise immunity on electrically harsh cabinets, and internal brown-out detection plus watchdog timer keep the node recoverable after supply dips. With 23 GPIO, one ATmega88A can replace several small logic devices, reducing BOM count on dense terminal boards.
推薦
Hobby, Education and Prototyping Boards
The ATmega88 family is a staple of maker and educational platforms because it is programmable with low-cost ISP tools and the open Arduino toolchain (bootloader-space permitting). The ATMEGA88A-MMH in VQFN suits compact shields and custom badges where the 4x4 mm body fits under modules, while the same firmware can be reused across the pin-compatible ATmega48A/168A/328P family as project complexity grows. Its 32 working registers and single-cycle execution make assembly-language teaching straightforward, and 512 B EEPROM demonstrates nonvolatile storage concepts. For breadboard-friendly development, engineers commonly prototype on the PDIP ATMEGA88-20PI and migrate the proven firmware to the MMH VQFN package for the production PCB.
推薦
LED Lighting and Dimming Control
The three timer/counters with compare modes let the ATMEGA88A-MMH generate multiple independent PWM channels for RGB LED dimming and color mixing without software bit-banging, keeping brightness jitter low. At 20 MHz, 8-bit PWM resolution at several kilohertz is easily achieved, avoiding visible flicker in camera-visible environments. The 8 KB Flash accommodates DMX-512 or infrared remote decoding, and EEPROM stores last-set brightness levels across power loss. The compact 4x4 mm VQFN fits inside LED driver housings and lamp bases where board area is scarce, while the exposed pad provides a low-inductance ground that reduces switching noise coupling into adjacent analog dimming circuitry. Sleep modes support occupancy-sensor-triggered luminaires waiting idle.
推薦
Metering and Data Logging
Energy, water, and thermal metering boards benefit from the ATMEGA88A-MMH's combination of EEPROM and low-power operation. Cumulative readings and calibration coefficients are written to the 512 B EEPROM with wear-leveling, surviving years of power interruptions, while the ADC samples current-shunt or transformer signals for consumption calculation. Read-while-write Flash allows occasional data-logging bursts to spare Flash sectors. The USART forwards readings to an external GSM/NB-IoT module for automatic meter reading infrastructure, and the watchdog ensures autonomous recovery in unattended installations. The small 4x4 mm VQFN suits densely packed meter PCBs, and choosing the PA variant in the same footprint extends battery-backed RTC endurance during grid-out intervals.
推薦
推薦產品摘要
工程參考資料，適用於 ATMEGA88A-MMH — 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-MMH | ATMEGA48A-MMH | ATMEGA48PA-MMH | ATMEGA168A-MMH |
|---|---|---|---|---|---|
| Package | 28-VQFN (4x4 mm) exposed pad | 28-VQFN (4x4 mm) - same | 28-VQFN (4x4 mm) - same | 28-VQFN (4x4 mm) - same | 28-VQFN (4x4 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 8 KB | 8 KB | 4 KB | 4 KB | 16 KB |
| SRAM | 1 KB | 1 KB | 256 B | 256 B | 1 KB |
| EEPROM | 512 B | 512 B | 256 B | 256 B | 512 B |
| Max Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| GPIO Count | 23 | 23 | 23 | 23 | 23 |
| Low-Power Technology | picoPower (A-version) | picoPower (PA, optimized) | standard A-version | picoPower (PA, optimized) | standard A-version |
主要差異化特點
- Double the memory of the 48A variant at the same footprint (對比ATMEGA48A-MMH)
- picoPower low-power technology (對比ATMEGA48A-MMH)
- In-field firmware upgrade path within one footprint (對比ATMEGA88PA-MMH)
- Trade-off: smaller ecosystem than 32-pin variants (對比ATMEGA88A-AU)
設計說明
The 28-VQFN (4x4 mm) exposed pad is the primary ground connection and must be soldered to a via-stitched ground pour. A typical pattern of a 3x3 via array (0.3 mm vias) under the pad improves both thermal performance and ground inductance. Inspect reflow with X-ray or use a solder-mask-defined aperture slightly smaller than the pad to prevent solder wicking starvation that causes open ground connections - the most common field failure mode for VQFN AVRs.
Decouple VCC with a 100 nF ceramic capacitor placed within 2 mm of the supply pad, plus a bulk 4.7-10 uF capacitor near the board entry. Connect AVCC to VCC through an LC or RC filter when ADC accuracy matters, keeping analog routing away from PWM switching loops. Estimated: at 20 MHz the ATmega88A active current is in the low-mA range, so IR drop is negligible on 0.2 mm traces, but sleep-mode budgets demand checking every pull-up and external divider leakage.
Always route RESET (PC6), MOSI, MISO, and SCK to a 2x3 ISP header, even on cost-reduced builds - losing in-field programmability turns a firmware fix into a rework campaign. Set fuse bits (clock source, boot size, brown-out) deliberately before production: an accidental CKDIV8 or external-clock fuse setting is the leading cause of 'dead' new AVR boards. Budget the 8 KB Flash early; enabling a bootloader reserves part of it permanently.
合規資訊
Compliance status was not stated in the provided verified web data; confirm RoHS/REACH status on the official Microchip product page or product identification card before export-controlled or EU shipments.
