ATMEGA329P-20ANR - 8-bit AVR MCU 32KB Flash 20MHz 64-TQFP | Microchip
MPN: ATMEGA329P-20ANR ✓ Hoạt độngATMEGA329P-20ANR Tóm tắt
An 8-bit AVR microcontroller (AVR MCU) is a RISC-based Harvard-architecture CMOS device optimised for deterministic single-cycle instruction execution. The ATMEGA329P belongs to the megaAVR family and sits inside the broader 8-bit microcontroller -> microcontroller IC -> integrated circuit hierarchy. The picoPower technology used in this family allows active and sleep current to drop dramatically, making the part suitable for line-powered or battery-backed industrial designs that must wake on interrupt.
Key features include 32 KB Flash with read-while-write capability, 1 KB EEPROM with 100k erase/write endurance, 2 KB SRAM, JTAG debug interface, two 8-bit timer/counters, one 16-bit timer/counter, 8-channel 10-bit ADC, programmable USART, master/slave SPI, TWI (I2C-compatible), internal calibrated RC oscillator, and six software-selectable power-saving modes. The part operates from 1.8 V to 5.5 V across -40 C to +105 C industrial temperature.
The architecture combines an advanced RISC core (131 instructions, most single-cycle) with a non-volatile memory subsystem and event system peripherals. The 64-pin TQFP provides enough I/O for human-machine interfaces, LCD control and parallel bus peripherals, while the 32 KB Flash is sufficient for USB HID class stacks, Modbus RTU slaves and graphical LCD drivers.
Typical applications include industrial control panels, white goods and HVAC user interfaces, metering and sensor front-ends, battery-powered data loggers, USB HID peripherals and small graphics LCD controllers. The wide 1.8-5.5 V supply range allows direct connection to a single Li-ion cell or a regulated 3.3 V / 5 V rail.
When designing with this device, allocate the ICSP/SPD signals on dedicated PCB test points so production programmers can reach the chip without removing surrounding passives. Decouple VCC with a 100 nF ceramic close to each power pin and add a bulk 10 uF at the supply input.
This page synthesises distributor pricing, drop-in alternatives, and design notes that go beyond the manufacturer datasheet to help engineers choose and source the part quickly.
Bộ thay thế dễ dàng lắp đặt cho ATMEGA329P-20ANR — 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 ATMEGA329P-20ANR (cùng hình factor và footprint) — khác nhau ở Operating Temperature, Package, ADC, RoHS Status, Timers/Counters.
ATMEGA329P-20AN
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATMEGA329P-20AUR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ATMEGA329P-20AU
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATMEGA325P-20AUR
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATMEGA329A-MUR
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATMEGA329P-20ANR Tỷ lệ tối đa & tính chất điện
| Core Architecture | AVR 8-bit RISC |
| Program Memory Type | Flash (In-System Programmable) |
| Program Memory Size | 32 KB (16K x 16) |
| SRAM Size | 2 KB |
| EEPROM Size | 1 KB |
| Maximum CPU Speed | 20 MHz |
| MIPS Throughput | 16 MIPS (up to 20 MHz) |
| Supply Voltage Range | 1.8 V to 5.5 V |
| Khoảng nhiệt độ hoạt động | -40 C to +105 C |
| Number of I/O Pins | 54 |
| Number of General-Purpose Registers | 32 |
| ADC | 8-channel, 10-bit |
| Timers/Counters | Two 8-bit, One 16-bit |
| Communication Interfaces | USART, SPI (Master/Slave), TWI (I2C) |
| Debug Interface | JTAG |
| Hộp | 64-TQFP (14x14 mm) |
| Kiểu lắp đặt | Surface Mount |
| Lead-Free / RoHS | Compliant |
Cấu hình chân ATMEGA329P-20ANR
| Chân 1 | VCC — Supply voltage |
| Chân 2 | GND — Ground |
| Chân 3 | XTAL1 — Crystal oscillator input |
| Chân 4 | XTAL2 — Crystal oscillator output |
| Chân 5 | RESET — Reset input, active low |
| Chân 6 | VCC — Supply voltage (digital) |
| Chân 7 | GND — Ground (digital) |
| Chân 8 | PD0 — Port D bit 0 / I/O |
| Chân 9 | PD1 — Port D bit 1 / I/O |
| Chân 10 | PD2 — Port D bit 2 / I/O |
| Chân 11 | PD3 — Port D bit 3 / I/O |
| Chân 12 | PD4 — Port D bit 4 / I/O |
| Chân 13 | PD5 — Port D bit 5 / I/O |
| Chân 14 | PD6 — Port D bit 6 / I/O |
| Chân 15 | PD7 — Port D bit 7 / I/O |
| Chân 16 | AVCC — Analog supply voltage |
| Chân 17 | AGND — Analog ground |
| Chân 18 | AREF — ADC reference voltage |
| Chân 19 | PA0 — Port A bit 0 / ADC0 |
| Chân 20 | PA1 — Port A bit 1 / ADC1 |
| Chân 21 | PA2 — Port A bit 2 / ADC2 |
| Chân 22 | PA3 — Port A bit 3 / ADC3 |
| Chân 23 | PA4 — Port A bit 4 / ADC4 |
| Chân 24 | PA5 — Port A bit 5 / ADC5 |
| Chân 25 | PA6 — Port A bit 6 / ADC6 |
| Chân 26 | PA7 — Port A bit 7 / ADC7 |
| Chân 27 | PC0 — Port C bit 0 / I/O |
| Chân 28 | PC1 — Port C bit 1 / I/O |
| Chân 29 | PC2 — Port C bit 2 / I/O |
| Chân 30 | PC3 — Port C bit 3 / I/O |
| Chân 31 | PC4 — Port C bit 4 / I/O |
| Chân 32 | PC5 — Port C bit 5 / I/O |
| Chân 33 | PC6 — Port C bit 6 / I/O |
| Chân 34 | PC7 — Port C bit 7 / I/O |
| Chân 35 | PB0 — Port B bit 0 / I/O |
| Chân 36 | PB1 — Port B bit 1 / I/O |
| Chân 37 | PB2 — Port B bit 2 / I/O |
| Chân 38 | PB3 — Port B bit 3 / I/O |
| Chân 39 | PB4 — Port B bit 4 / I/O |
| Chân 40 | PB5 — Port B bit 5 / I/O |
| Chân 41 | PB6 — Port B bit 6 / I/O |
| Chân 42 | PB7 — Port B bit 7 / I/O |
| Chân 43 | PE0 — Port E bit 0 / I/O |
| Chân 44 | PE1 — Port E bit 1 / I/O |
| Chân 45 | PE2 — Port E bit 2 / I/O |
| Chân 46 | PE3 — Port E bit 3 / I/O |
| Chân 47 | PE4 — Port E bit 4 / I/O |
| Chân 48 | PE5 — Port E bit 5 / I/O |
| Chân 49 | PE6 — Port E bit 6 / I/O |
| Chân 50 | PE7 — Port E bit 7 / I/O |
| Chân 51 | PF0 — Port F bit 0 / I/O |
| Chân 52 | PF1 — Port F bit 1 / I/O |
| Chân 53 | PF2 — Port F bit 2 / I/O |
| Chân 54 | PF3 — Port F bit 3 / I/O |
| Chân 55 | PF4 — Port F bit 4 / I/O |
| Chân 56 | PF5 — Port F bit 5 / I/O |
| Chân 57 | PF6 — Port F bit 6 / I/O |
| Chân 58 | PF7 — Port F bit 7 / I/O |
| Chân 59 | TDI — JTAG Test Data In |
| Chân 60 | TDO — JTAG Test Data Out |
| Chân 61 | TMS — JTAG Test Mode Select |
| Chân 62 | TCK — JTAG Test Clock |
| Chân 63 | VCC — Supply voltage |
| Chân 64 | GND — Ground |
Ứng dụng tiêu biểu
ATMEGA329P-20ANR phù hợp cho 6 Áp dụngs: Industrial Control Panels, White Goods and HVAC User Interfaces, Battery-Powered Data Loggers, USB HID Peripherals, Smart Metering Front-Ends, Small Graphics LCD Controllers.
Industrial Control Panels
The ATMEGA329P-20ANR fits industrial control panels thanks to its 54 GPIO, 8-channel 10-bit ADC and 32 KB Flash. The MCU directly drives keypads, LED indicators, relays and segmented displays while sampling analog signals such as temperature, pressure or 4-20 mA sensors. Its 20 MHz clock gives enough headroom for Modbus RTU slaves and PID loops, and the -40 C to +105 C temperature rating supports factory-floor enclosures. Recommended companion MPNs: ATMEGA329-16AU for lower-speed designs, ATMEGA329A-MUR for non-picoPower variants.
Được đề xuất
White Goods and HVAC User Interfaces
In washing machines, dishwashers, refrigerators and HVAC thermostats, the ATMEGA329P-20ANR handles user I/O, sensor scanning and small graphic LCD or TFT panels. Its 2 KB SRAM holds touch/keypad buffers, 1 KB EEPROM stores user preferences, and the USART links to a wireless module or main controller. picoPower sleep modes let the appliance idle under 1 uA when idle, critical for ENERGY STAR ratings. Recommended companion MPNs: ATMEGA328P-MU for Bluetooth/Wi-Fi gateway co-MCUs, ATMEGA328PB-AU for richer peripheral set.
Được đề xuất
Battery-Powered Data Loggers
The ATMEGA329P-20ANR excels in portable data loggers where low-power sleep, 1 KB EEPROM, and 20 MHz CPU bursts matter. The MCU wakes on RTC or external interrupt, samples sensors via the ADC, compresses data into RAM, then writes batches into EEPROM or external SPI Flash before returning to sleep. With picoPower idle modes, typical quiescent draw is under 1 uA, allowing years of operation from a single CR2032 cell. Recommended companion MPNs: ATMEGA325A-MU for 16 KB Flash cost-down variant, ATMEGA325P-20MU for industrial temperature grade.
Được đề xuất
USB HID Peripherals
Using the on-chip USART and external USB-serial bridges, the ATMEGA329P-20ANR implements USB HID devices such as barcode scanners, custom keypads, or test instruments. 32 KB Flash holds USB stacks (LUFA/Atmel USB) and application logic, 2 KB SRAM supports HID reports, and JTAG simplifies firmware development. The wide 1.8-5.5 V supply enables single Li-ion or USB-bus powered designs. Recommended companion MPNs: ATMEGA328PB-MU for native USB variant, ATMEGA328P-PU for DIP-package development board.
Được đề xuất
Smart Metering Front-Ends
In electricity, gas or water meter designs, the ATMEGA329P-20ANR samples current/voltage sensors through its 10-bit ADC, performs RMS and power calculations, drives the metrology front-end, and exposes data via USART/SPI/TWI to a wireless modem. The 32 KB Flash holds DLMS/COSEM or Modbus stacks, the 1 KB EEPROM stores calibration coefficients, and the 105 C temperature rating suits outdoor meter enclosures. Recommended companion MPNs: ATMEGA329-16AUR for low-cost meter variants, ATMEGA325P-20AUR for smaller-code meter firmware.
Được đề xuất
Small Graphics LCD Controllers
With 32 KB Flash and 2 KB SRAM, the ATMEGA329P-20ANR can drive small graphical LCDs (128x64 monochrome or 320x240 colour via external controller) and render icons, fonts and animations. The 54 GPIO are sufficient to interface parallel LCDs, SPI/TWI for smaller OLED/TFT displays, and ADC channels for resistive touch sensing. Its 20 MHz core handles refresh, font lookup and UI state without DMA. Recommended companion MPNs: ATMEGA3290V-8AUR for high-voltage LCD drivers, ATMEGA3290PA-AU for picoPower LCD controllers.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ATMEGA329P-20ANR — 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 | ATMEGA329P-20AN | ATMEGA329P-20AUR | ATMEGA329P-20AU | ATMEGA325P-20AU | ATMEGA329A-MUR |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | TQFP-64 (14x14 mm) | TQFP-64 (14x14 mm) - same | TQFP-64 (14x14 mm) - same | TQFP-64 (14x14 mm) - same | TQFP-64 (14x14 mm) - same | TQFP-64 (14x14 mm) - same |
| Flash Size | 32 KB | 32 KB | 32 KB | 32 KB | 16 KB | 32 KB |
| SRAM Size | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB |
| EEPROM Size | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB |
| Max CPU Speed | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Operating Temperature | -40 C to +105 C | -40 C to +105 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| Supply Voltage Range | 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 |
| picoPower Technology | Yes | Yes | Yes | Yes | Yes | No (ATmega329A non-picoPower) |
Bảo phân biệt quan trọng
- Industrial temperature rating to +105 C (vsATMEGA329P-20AUR)
- 32 KB Flash with read-while-write support (vsATMEGA325P-20AU)
- picoPower technology for sub-microamp sleep (vsATMEGA329A-MUR)
Ghi chú thiết kế
Place a 100 nF X7R decoupling capacitor as close as possible to each ATMEGA329P-20ANR VCC pin (pins 1, 6, 63) and one to AVCC (pin 16), plus a single 10 uF bulk capacitor at the supply entry point. This arrangement meets the AVR's transient-current demands when the CPU wakes from sleep and peripherals start simultaneously, and keeps digital switching noise from corrupting ADC readings on AVCC.
Route the JTAG signals (TDI, TDO, TMS, TCK on pins 59-62) with short, parallel traces kept clear of switching lines and routed with a continuous ground reference. Keep the crystal traces (XTAL1/2) short and symmetric, surrounded by a ground pour and isolated from noisy signals like PWM outputs or relay drivers. Use a 4-layer PCB with a solid ground plane to minimise EMI and ensure JTAG debug stability.
Do not leave the RESET pin (pin 5) floating. Tie it to VCC through a 10 kohm pull-up and add a 100 nF capacitor to ground for noise filtering. Leaving RESET floating makes the MCU vulnerable to spurious resets from capacitive coupling. Also remember to disable the JTAG fuse if you repurpose pins 59-62 as GPIO, since enabling JTAG takes over those pins even when no debugger is attached.
The ATMEGA329P-20ANR is rated up to +105 C junction temperature. In enclosed industrial enclosures with limited airflow, estimate: Pdiss = VCC x ICC_active, where ICC_active is approximately 10 mA at 20 MHz with all peripherals on. From VCC=5 V this yields 50 mW per device, well within the TQFP-64 theta_JA of around 50 C/W, giving a junction rise of only 2.5 C above ambient. No heatsink is required.
Thông tin tuân thủ
RoHS and lead-free compliant per Microchip product page. AEC-Q100 not qualified - choose ATmega automotive-grade parts for vehicle applications. Halogen-free status not explicitly stated in the verified web data.