AVR32DA28-I/SO - 8-bit AVR DA MCU, 32KB Flash, 28-SOIC | Microchip
MPN: AVR32DA28-I/SO ✓ Hoạt độngAVR32DA28-I/SO Tóm tắt
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory (Flash), working memory (SRAM), EEPROM, and a rich set of peripherals. The AVR® CPU belongs to a RISC architecture family known for deterministic instruction timing, single-cycle register access, and a mature toolchain (MPLAB X, Atmel Studio, and the Arduino-compatible DxCore core). In the broader taxonomy: AVR® DA -> 8-bit MCU -> microcontroller -> embedded processor -> semiconductor. The 1.8V to 5.5V supply range means the device can run directly from a single Li-ion cell or a regulated 3.3V / 5V rail, simplifying power-tree design.
Key features include the hardware multiplier for fast arithmetic, an Event System for inter-peripheral signalling without CPU intervention, intelligent analog peripherals (12-bit ADC, three comparators, three zero-cross detectors, a DAC), capacitive touch (PTC) hardware, six U(S)ARTs, two SPI, and TWI (I²C-compatible). The 28-SOIC (I/SO) variant offers the largest pin count of the SO-package options and provides ample GPIO for keypad, segment-display, and mixed-signal front-ends.
Internally, the AVR® DA uses a pipelined Harvard bus: separate Flash and SRAM buses let the CPU fetch instructions and read/write data in the same cycle. The 24 MHz clock, hardware multiplier, and zero-wait-state Flash fetch yield roughly 1 MIPS per MHz, so the part delivers up to ~24 MIPS. The integrated Core Independent Peripherals - Event System, CCL (Configurable Custom Logic), and peripheral touch controller - let complex timing and control tasks run with zero CPU load.
Typical applications include capacitive touch human-machine interfaces (HMI), white-goods and small-appliance motor control, LED lighting controllers, sensor hubs with on-chip ADC, and battery-powered IoT nodes. The AVR® DA family is a popular modern replacement for legacy ATmega328P designs that need more Flash, real-time control, and touch capability without migrating to ARM.
When designing with the AVR32DA28-I/SO, ensure the ICSP/PDI programming header follows the 6-pin AVR ISP convention with the MCLR pull-up sized for your VDD rail (typically 10 kΩ). Decouple VDD with a 100 nF X7R ceramic placed within 3 mm of each VDD pin, and add a 4.7 µF bulk capacitor near the AVCC pin to keep the ADC reference stable.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not consolidated in the manufacturer datasheet alone.
Bộ thay thế dễ dàng lắp đặt cho AVR32DA28-I/SO — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
AVR64DA28-I/SO
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AVR128DA28-I/SO
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AVR32DB28-I/SO
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AVR64DB28-I/SO
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AVR32DA28-I/SO Tỷ lệ tối đa & tính chất điện
| Core | AVR (8-bit RISC with hardware multiplier) |
| Maximum CPU Frequency | 24 MHz |
| Supply Voltage Range | 1.8 V to 5.5 V |
| Flash Program Memory | 32 KB |
| SRAM | 4 KB |
| EEPROM | 512 B |
| Hộp | 28-pin SOIC (I/SO) |
| Kiểu lắp đặt | Surface Mount |
| ADC | 12-bit |
| Comparators | 3 |
| Zero-Cross Detectors (ZCD) | 3 |
| DAC | Yes (10-bit) |
| Peripheral Touch Controller (PTC) | Yes (capacitive touch) |
| U(S)ART | 6 |
| SPI | 2 |
| TWI (I²C-compatible) | Yes |
| Nhiệt độ hoạt động | -40 C to +85 C (Industrial) |
| Event System | Yes |
| Cấp MSL | 3 |
| Trạng thái RoHS | Compliant |
Cấu hình chân AVR32DA28-I/SO
| Chân 1 | VCC — Digital supply voltage |
| Chân 2 | PC0 — Port C bit 0 (GPIO / ADC0) |
| Chân 3 | PC1 — Port C bit 1 (GPIO / ADC1) |
| Chân 4 | PC2 — Port C bit 2 (GPIO / ADC2) |
| Chân 5 | PC3 — Port C bit 3 (GPIO / ADC3) |
| Chân 6 | AVCC — Analog supply voltage |
| Chân 7 | GND — Ground |
| Chân 8 | AREF — ADC reference voltage |
| Chân 9 | PD0 — Port D bit 0 (GPIO / AIN0) |
| Chân 10 | PD1 — Port D bit 1 (GPIO / AIN1) |
| Chân 11 | PD2 — Port D bit 2 (GPIO / AIN2 / ZCD0) |
| Chân 12 | PD3 — Port D bit 3 (GPIO / ZCD1) |
| Chân 13 | PD4 — Port D bit 4 (GPIO / ZCD2) |
| Chân 14 | PD5 — Port D bit 5 (GPIO) |
| Chân 15 | PD6 — Port D bit 6 (GPIO) |
| Chân 16 | PD7 — Port D bit 7 (GPIO) |
| Chân 17 | PB0 — Port B bit 0 (GPIO / USART0 TX) |
| Chân 18 | PB1 — Port B bit 1 (GPIO / USART0 RX) |
| Chân 19 | PB2 — Port B bit 2 (GPIO / SPI0 SS) |
| Chân 20 | PB3 — Port B bit 3 (GPIO / SPI0 MOSI) |
| Chân 21 | PB4 — Port B bit 4 (GPIO / SPI0 MISO) |
| Chân 22 | PB5 — Port B bit 5 (GPIO / SPI0 SCK) |
| Chân 23 | PA0 — Port A bit 0 (GPIO / USART1 TX) |
| Chân 24 | PA1 — Port A bit 1 (GPIO / USART1 RX) |
| Chân 25 | PA2 — Port A bit 2 (GPIO / TWI SDA) |
| Chân 26 | PA3 — Port A bit 3 (GPIO / TWI SCL) |
| Chân 27 | RESET/MCLR — Reset (active low) / programming |
| Chân 28 | GND — Ground |
Ứng dụng tiêu biểu
AVR32DA28-I/SO phù hợp cho 7 Áp dụngs: Capacitive Touch HMI Front Panel, Small Appliance Motor Control, LED Lighting Controller, Industrial Sensor Hub, Battery-Powered IoT Node, White Goods User Interface, AVR Legacy Upgrade (ATmega328P Drop-In on New Boards).
Capacitive Touch HMI Front Panel
The AVR32DA28-I/SO is purpose-built for capacitive touch human-machine interfaces thanks to its integrated Peripheral Touch Controller (PTC) supporting up to 144 mutual-capacitance channels, 12-bit ADC, three comparators for guard-brail signalling, and an Event System that runs touch acquisition autonomously without CPU intervention. The on-chip DAC and three ZCDs handle LED dimming and zero-cross TRIAC triggering in the same MCU. With 32 KB Flash / 4 KB SRAM, the device comfortably fits touch firmware plus a small GUI/state machine. The 28-SOIC footprint gives enough GPIO for 16-20 touch electrodes plus segment-display drivers.
Được đề xuất
Small Appliance Motor Control
The AVR32DA28-I/SO fits small-appliance motor control loops (fan, pump, small BLDC) because its three on-chip comparators and three zero-cross-detectors handle back-EMF sensing and TRIAC commutation in real time, while the Event System keeps the control loop deterministic without CPU load. The 24 MHz AVR CPU with hardware multiplier executes PI / PID loops in microseconds, and the 12-bit ADC samples the shunt resistor at high PWM rates. The 1.8V-5.5V supply range lets the same firmware run from a 3.3V regulated rail or directly from a rectified 5V bus.
Được đề xuất
LED Lighting Controller
The AVR32DA28-I/SO controls multi-channel LED drivers and color-mixing fixtures using its 10-bit DAC, six U(S)ART channels for DMX / DALI / SPI LED-driver links, two SPI interfaces for APA102 / SK6812 style LED strips, and three ZCDs for mains-zero-cross dimming in AC-LED bulbs. The hardware multiplier accelerates CIE-1931 color-correction math in real time, and the 32 KB Flash holds DMX personality tables plus smooth-fade state machines. PTC channels add a touch dimmer on the lamp surface with no extra IC.
Được đề xuất
Industrial Sensor Hub
The AVR32DA28-I/SO aggregates industrial sensor data over its six U(S)ART ports (Modbus RTU), one TWI (I2C) bus for digital sensors, and one SPI channel for high-speed ADC front-ends. The 12-bit ADC reads up to 16 external analog channels for 4-20 mA loops or thermocouples (with on-chip amplifier), and the hardware multiplier runs moving-average / Kalman filtering. With 4 KB SRAM the device holds sample buffers for multiple sensors before relaying over RS-485, and the 1.8V-5.5V supply works with industrial 24V->5V rails.
Được đề xuất
Battery-Powered IoT Node
The AVR32DA28-I/SO is well-suited to battery-powered IoT nodes because the AVR DA sleep modes drop quiescent current to the single-digit µA range, the Event System wakes the CPU only on a peripheral trigger, and the 1.8V minimum supply runs the device directly off a single Li-ion cell (3.0-4.2V). 32 KB Flash / 4 KB SRAM hold a small LoRaWAN or BLE-passthrough stack, the six U(S)ARTs interface multiple radios / sensors, and the PTC replaces mechanical buttons for a sealed IP-rated housing.
Được đề xuất
White Goods User Interface
The AVR32DA28-I/SO drives white-goods user-interface boards (washing machine, dishwasher, oven) by combining the PTC for sealed touch panels, the DAC for beeper / buzzer tones, three ZCDs for AC-line synchronization of TRIAC-driven heaters, and six U(S)ARTs for the appliance main controller. The wide 1.8V-5.5V supply tolerates direct 5V power, and 32 KB Flash holds multi-language UI firmware plus diagnostic logs. The 28-SOIC footprint is industry-standard for UI sub-boards, simplifying panel rework.
Được đề xuất
AVR Legacy Upgrade (ATmega328P Drop-In on New Boards)
For new boards replacing the ATmega328P-AU / ATmega328P-AUR (TQFP-32), the AVR32DA28-I/SO gives 4x the Flash (32 KB vs 32 KB equal but more headroom in compiler libraries), 4x the SRAM (4 KB vs 2 KB), hardware multiplier, Event System, DAC, and capacitive touch - all on a modern AVR DA core supported by the open-source DxCore Arduino core. New PCB layouts benefit from 28-SOIC for hand-prototyping and reflow profiles, while the AVR DA family brings modern peripherals without forcing an ARM migration.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho AVR32DA28-I/SO — 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 | AVR64DA28-I/SO | AVR128DA28-I/SO | AVR32DB28-I/SO |
|---|---|---|---|---|
| Package | 28-SOIC | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash | 32 KB | 64 KB | 128 KB | 32 KB |
| SRAM | 4 KB | 4 KB | 4 KB | 4 KB |
| EEPROM | 512 B | 512 B | 512 B | 512 B |
| Max CPU Frequency | 24 MHz | 24 MHz | 24 MHz | 24 MHz |
| Supply 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 |
| ADC | 12-bit | 12-bit | 12-bit | 12-bit (with PGA) |
| DAC | 10-bit | 10-bit | 10-bit | 2x 10-bit + 1x 12-bit |
| Capacitive Touch (PTC) | Yes | Yes | Yes | Yes (enhanced) |
Bảo phân biệt quan trọng
- Direct 64 KB Flash upgrade in the same 28-SOIC package (vsAVR64DA28-I/SO)
- Integrated capacitive touch (PTC) with up to 144 channels (vsATmega328P-AUR)
- Hardware multiplier and Event System for autonomous peripherals (vsAVR32DB28-I/SO)
Ghi chú thiết kế
Estimated decoupling budget for the AVR32DA28-I/SO: place one 100 nF X7R 0603 ceramic within 3 mm of each VDD pin (digital) and one 100 nF X7R within 3 mm of AVCC (analog). Add a single 4.7 µF X5R bulk on the AVCC rail and a 10 µF bulk on the main VDD rail. The 1.8 V-5.5 V supply range lets the device run from a 3.3 V LDO or directly from a single Li-ion cell; ensure the LDO has <50 mV pp ripple on AVCC to keep ADC SNR above 70 dB.
Keep the RESET/MCLR trace short (<25 mm) and add the 10 kΩ pull-up to VDD and a 100 nF to ground for noise-free reset. Place the 6-pin ICSP header (MCLR, VDD, GND, PDI, RX, TX) on the board edge for production programming. The 28-SOIC land pattern supports both hand-soldering and standard reflow; pad pitch is 1.27 mm (50 mil).
Do not leave the UPDI pin floating - the AVR32DA28-I/SO requires the UPDI pin to be tied either to VDD through a resistor (typical 4.7 kΩ) or to the programming header. If UPDI is re-purposed as GPIO, the fuse must be cleared first; locking the device without UPDI access is a common production pitfall. The DAC output cannot drive more than 1 mA; buffer it with an op-amp if you need higher drive.
Thông tin tuân thủ
RoHS compliant per Microchip product page. Industrial temperature grade (-40C to +85C); for automotive AEC-Q100 use AVR32DA28-E/SO (extended) or contact Microchip for Q1-grade variants. Halogen-free status not explicitly stated.
