ATMEGA808-MU - 8KB AVR MCU 20MHz VQFN-32 | Microchip
MPN: ATMEGA808-MU ✓ Hoạt độngATMEGA808-MU Tóm tắt
An 8-bit microcontroller (MCU) is an integrated circuit that integrates a processor core, program memory, data memory, and peripherals on a single chip, executing one instruction over an 8-bit data bus. Within the embedded-system hierarchy, the MCU sits at the device level below system-on-chip and application processors, and the megaAVR 0-series is Microchip's modernized AVR generation built on the latest Core Independent Peripherals philosophy, succeeding classic megaAVR parts such as the ATmega328P family while maintaining the AVR instruction-set heritage.
Key differentiating specifications include the wide 1.8V to 5.5V operating voltage range, which allows direct operation from single-cell Li-ion-adjacent 3.3V and 5V industrial rails; the 20 MHz maximum CPU clock with single-cycle hardware multiplier for efficient math; and Functional Safety (FuSa) documentation support, easing compliance work in safety-oriented designs. Connectivity covers I2C, SPI, and USART serial interfaces with 27 general-purpose I/O lines on the 32-pin variant.
Technically, the megaAVR 0-series AVR core features a modified Harvard architecture with a two-stage pipeline, single-cycle instruction execution for most instructions, and peripheral modules such as event system routing that let timers, ADCs, and communication blocks interact without CPU intervention, reducing interrupt latency and deterministic-jitter in real-time loops. Flash-based program memory supports in-system self-programming for bootloaders.
Typical applications include industrial control and automation nodes, consumer appliances and HVAC control boards, and motor control or LED lighting systems where a 5V-tolerant 8-bit MCU with rich timers is preferred over 32-bit parts for cost and simplicity. The FuSa support also suits functional-safety assessments in industrial equipment.
A key design consideration: supply decoupling and the exposed pad should be soldered to ground for thermal and EMC performance, and the 1.8-5.5V range means BOD thresholds must be programmed to match the rail.
This page synthesizes distributor pricing, drop-in alternatives within the megaAVR 0-series, and practical design guidance not found in the manufacturer datasheet, with pricing as of 2026-09-18.
Bộ thay thế dễ dàng lắp đặt cho ATMEGA808-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 ATMEGA808-MU (cùng hình factor và footprint) — khác nhau ở Core Processor, Package, Series, Connectivity, EEPROM.
ATMEGA809-MU
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ATMEGA1608-MU
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
ATMEGA3208-MUR
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ATMEGA4808-MUR
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ATMEGA808-MFR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ATMEGA808-MU Tỷ lệ tối đa & tính chất điện
| Core Processor | AVR (megaAVR 0-series) |
| Core Size | 8-Bit |
| Tần số xung maksimum | 20 MHz |
| Flash Memory | 8 KB (8K x 8) |
| SRAM | 1 KB |
| EEPROM | 256 Byte |
| Operating Voltage Range | 1.8 V to 5.5 V |
| Connectivity | I2C, SPI, USART |
| Number of I/O | 27 |
| Hardware Multiplier | Yes |
| Functional Safety Support | FuSa (Functional Safety) documentation available |
| Nhiệt độ hoạt động | -40C to +85C |
| Hộp | 32-VQFN (5x5 mm) with exposed pad |
| Kiểu lắp đặt | Surface Mount |
| Packaging | Tray |
| Program Memory Type | FLASH |
| Trạng thái RoHS | Compliant (per JLCPCB listing) |
Hướng dẫn cấu hình chân ATMEGA808-MU 32-vqfn (5x5 mm) with exposed pad
Cấu hình chân cho ATMEGA808-MU (32-vqfn (5x5 mm) with exposed pad gói). IC số này bao gồm chân GPIO, giao diện truyền thông (UART, SPI, I2C) và chân nguồn. Tham khảo tài liệu thông số kỹ thuật của nhà sản xuất để biết các chức năng chân thay thế và tùy chọn cấu hình. Cực kỳ quan trọng cho thiết kế hệ thống tích hợp và lập trình PCB.
Không có dữ liệu chân cụ thể sẵn có cho ATMEGA808-MU.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
ATMEGA808-MU phù hợp cho 6 Áp dụngs: Industrial Control and Automation Nodes, Home Appliances and HVAC Control, Motor Control and Fan Drivers, LED Lighting and Dimming Systems, IoT Sensor Nodes and Gateways (sub-GHz front ends), Functional-Safety-Oriented Subsystems.
Industrial Control and Automation Nodes
The ATMEGA808-MU fits industrial control nodes because its 20 MHz AVR core with hardware multiplier handles control-loop math at low cost, while the 1.8-5.5V supply range accepts regulated 5V industrial rails directly without level shifting to 3.3V logic. With 27 GPIO and I2C, SPI, and USART interfaces, it comfortably drives relays, reads sensors, and reports to a PLC or SCADA layer. Core Independent Peripherals and the event system keep timer-driven sequencing deterministic even under heavy communication load, and the -40C to +85C rating covers unconditioned cabinets. Microchip's FuSa documentation support further eases assessment in safety-relevant automation equipment, making this MCU a pragmatic 8-bit choice where a 32-bit part would add cost without adding value.
Được đề xuất
Home Appliances and HVAC Control
Appliance and HVAC controller boards benefit from the ATMEGA808-MU's combination of wide 1.8-5.5V operation, robust -40C to +85C temperature rating, and abundant GPIO for keypad scanning, LED indication, relay and triac driving. The 20 MHz core with hardware multiplier executes PID temperature-control loops with headroom at 8 KB Flash, and 256 bytes of EEPROM retains user settings and fault counters across power cycles. USART and I2C links integrate display drivers, NTC-front-end ADCs, or external EEPROM. Because Core Independent Peripherals time PWM outputs autonomously, heater or fan PWM continues correctly even while the CPU is busy with communication - a frequent failure mode on cheaper 8-bit parts - improving reliability in duty-cycled appliance environments.
Được đề xuất
Motor Control and Fan Drivers
For small BLDC, brushed-DC, and fan motor control, the ATMEGA808-MU offers multiple hardware timer PWM outputs routed through the event system, letting the CPU offload commutation and duty-cycle generation entirely. The 20 MHz clock resolution gives fine PWM granularity for quiet fan operation, while the hardware multiplier accelerates speed-ramp and PI-controller calculations within the 8 KB Flash budget. The wide 1.8-5.5V input range allows the same firmware across 3.3V logic-domain designs and 5V gate-drive designs. Tachometer pulses can be captured by peripheral input capture without CPU jitter, and the VQFN-32 (5x5) footprint keeps the controller compact on dense driver boards typical of modern appliance and industrial blower assemblies.
Được đề xuất
LED Lighting and Dimming Systems
LED luminaires and dimming controllers use the ATMEGA808-MU for its deterministic, peripheral-driven PWM: hardware timers generate flicker-free dimming curves while the CPU manages DALI-style USART frames, I2C ambient-light sensors, or push-dim inputs. The 5V tolerance and wide 1.8-5.5V range simplify integration with offline-supply secondary rails, and -40C to +85C operation suits enclosed, thermally stressful luminaires. The 8 KB Flash accommodates dimming curves, fade algorithms, and a USART bootloader for field updates, while 256 bytes of EEPROM stores last-set brightness across outages. Using the event system, analog-dimmer input sampling and PWM output updates stay synchronized, avoiding the beat-frequency artifacts common when dimming loops run in software on busy 8-bit MCUs.
Được đề xuất
IoT Sensor Nodes and Gateways (sub-GHz front ends)
In battery- and line-powered IoT sensor nodes, the ATMEGA808-MU serves as the main controller interfacing sensors over I2C/SPI and a sub-GHz or proprietary radio module over USART. The AVR 0-series sleep architecture plus a 20 MHz core that finishes tasks quickly supports duty-cycled, energy-aware firmware, and 256 bytes of EEPROM caches calibration and node identity. Its 5V tolerance bridges 3.3V radio modules and legacy 5V field sensors in the same design. Core Independent Peripherals can acquire and pre-filter sensor data while the CPU sleeps between radio transmissions, extending battery life. Although the part has no integrated radio, pairing it with a dedicated RF transceiver module yields a low-BOM-cost node with well-understood 8-bit firmware, supported by the open MegaCoreX Arduino ecosystem for rapid prototyping.
Được đề xuất
Functional-Safety-Oriented Subsystems
The megaAVR 0-series, including the ATMEGA808-MU, is listed by DigiKey as a Functional Safety (FuSa) microcontroller line, meaning Microchip provides safety documentation packages that support assessments under industrial functional-safety frameworks. In practice this suits safety-adjacent (non-silicon-certified) subsystems: watchdog supervision, sensor-plausibility checks, and two-channel shutdown logic in machines where the MCU contributes to a safety function assessed at the system level. The deterministic AVR core, hardware CRC-capable Flash self-programming for bootloaders, and Core Independent Peripherals that keep timing behavior predictable under CPU load all simplify the safety analysis. Designers should request the specific FuSa safety manual for ATmega808 from Microchip and confirm the target standard coverage before locking the architecture.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ATMEGA808-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 | ATMEGA809-MU | ATMEGA1608-MU | ATMEGA3208-MU | ATMEGA4808-MUR | ATMEGA808-MFR |
|---|---|---|---|---|---|---|
| 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 | VQFN-32 rotated footprint - NOT footprint-identical |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 8 KB | 8 KB | 16 KB | 32 KB | 48 KB | 8 KB |
| SRAM | 1 KB | 1 KB | 2 KB | 4 KB | 6 KB | 1 KB |
| Maximum Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Operating Voltage | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V |
| Drop-in Compatibility | Reference part | Pin-to-pin, no firmware change | Pin-to-pin, no firmware change | Pin-to-pin, no firmware change | Pin-to-pin, no firmware change | Electrical drop-in; footprint rotated - check PCB |
Bảo phân biệt quan trọng
- Lowest-cost entry of the pin-compatible megaAVR 0-series 32-pin family (vsATMEGA4808-MUR)
- Functional Safety (FuSa) documentation support (vsATmega328P)
- Trade-off: minimal 1 KB SRAM (vsATMEGA1608-MU)
Ghi chú thiết kế
The ATMEGA808-MU's 32-VQFN (5x5) has an exposed pad that must be soldered to the ground plane - do not treat it as a no-connect. Use a 3x3 or larger thermal via array under the pad for reliable reflow and best EMC performance. Place a 100 nF ceramic decoupling capacitor within 2 mm of each VDD pin pair plus one bulk 4.7-10 uF capacitor near the supply entry. Verify the land pattern against Microchip's mechanical drawing for the MU (standard) footprint, since the MFR variant uses a rotated pad arrangement and is not interchangeable on the same PCB.
Although rated 1.8-5.5V, set the Brown-Out Detector (BOD) fuse/EEPROM configuration to match your actual rail (e.g., 2.7V threshold for 5V systems) so Flash writes and SRAM state are protected during brown-outs. Flash self-programming has minimum voltage requirements at the low end of the range - check the datasheet operating-profile tables before enabling a bootloader on 1.8V supplies. Estimated: at 20 MHz and 5V the AVR 0-series active current is on the order of 5-6 mA (per family typical curves), so battery designs should exploit the sleep modes and event-driven peripheral operation rather than polling loops.
Two frequent mistakes with this part: (1) assuming any ATMEGA808 suffix is footprint-identical - the MU and MFR packages differ in pin-1 orientation, so order the MU for existing ATMEGA808-MU layouts; (2) assuming larger-flash family parts need code changes - ATMEGA1608/3208/4808 run ATmega808 firmware unchanged, making them the correct shortage substitution. When migrating from classic AVRs like ATmega328P, remember the 0-series has a different peripheral register map and requires MegaCoreX or MPLAB XC8 0-series device packs - classic AVR code will not compile unchanged.
Thông tin tuân thủ
RoHS compliance per JLCPCB product listing (C1340539). Not an automotive-qualified suffix; DigiKey lists Functional Safety (FuSa) documentation support for the megaAVR 0-series. REACH/halogen-free/conflict-minerals status not stated in provided data.
