ATMEGA48PA-MNR - 8-Bit AVR MCU 20MHz 4KB Flash | Microchip
MPN: ATMEGA48PA-MNR ✓ Hoạt độngATMEGA48PA-MNR Tóm tắt
An 8-bit AVR microcontroller is a single-chip computer built around an Advanced RISC architecture in which 131 powerful instructions are mostly executed in a single clock cycle, placing it at the top of the MCU hierarchy: microcontroller -> embedded processor -> semiconductor device. The ATmega family adds in-system programmable (ISP) Flash and a picoPower technology core, making it a staple of the broader power-management-aware embedded design ecosystem.
Key features include 20 MIPS throughput at 20 MHz, two 8-bit timer/counters and one 16-bit timer with compare modes, a 10-bit ADC with 8 channels, a programmable Watchdog Timer with separate on-chip oscillator, and six sleep modes including Idle, ADC Noise Reduction, and Power-save. Operating voltage spans 1.8 V to 5.5 V, supporting both 3.3 V and 5 V systems.
The picoPower core reduces active current consumption dramatically compared with the earlier ATmega48, while retaining full 105 C industrial temperature capability per the Mouser listing. The enhanced RISC Harvard architecture with 32 general-purpose working registers gives single-cycle access to registers, and hardware multipliers speed up math-intensive firmware.
Typical applications include battery-powered sensor nodes, consumer appliances, HVAC and motor control boards, and industrial automation slaves using UART/SPI/TWI interfaces.
Design consideration: keep the VCC/GND pairs on the VQFN center pads properly decoupled with 100 nF ceramics placed within 2 mm of the pads, since the MLF power pads are internal to the footprint.
This page synthesizes distributor pricing, same-package drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho ATMEGA48PA-MNR — 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 ATMEGA48PA-MNR (cùng hình factor và footprint) — khác nhau ở Package, Packaging, Timers, Number of I/O, Communication Interfaces.
ATMEGA48PB-MNR
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ATMEGA48A-MNR
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
ATMEGA88PA-MNR
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ATMEGA168PA-MNR
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ATMEGA48PA-15MZ
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ATMEGA48V-10MNR
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
ATMEGA48PA-MNR Tỷ lệ tối đa & tính chất điện
| Core Architecture | AVR 8-bit RISC |
| CPU Speed | 20 MHz (20 MIPS) |
| Flash Memory | 4 KB (2K x 16) ISP |
| EEPROM | 256 B |
| SRAM | 512 B |
| General Purpose I/O | 23 |
| Operating Voltage Range | 1.8 V to 5.5 V |
| Nhiệt độ hoạt động | -40C to +105C |
| Timers | 2 x 8-bit, 1 x 16-bit |
| ADC | 10-bit, 8 channels |
| Communication Interfaces | USART, SPI, TWI (I2C) |
| Sleep Modes | 6 (incl. Power-down, Power-save) |
| Watchdog Timer | Yes, with separate oscillator |
| Hộp | 32-VQFN (MLF) 5x5 mm |
| Kiểu lắp đặt | Surface Mount |
| Packaging | Tape & Reel (MNR) |
| Trạng thái RoHS | Compliant (Green package) |
Cấu hình chân ATMEGA48PA-MNR
| Chân 1 | PD3 — Port D bit 3 (digital I/O) |
| Chân 2 | PD4 — Port D bit 4 (digital I/O / XCK) |
| Chân 3 | GND — Ground |
| Chân 4 | VCC — Digital supply voltage |
| Chân 5 | GND — Ground |
| Chân 6 | VCC — Digital supply voltage |
| Chân 7 | PB7 — Port B bit 7 (XTAL2/TOSC2) |
| Chân 8 | PB6 — Port B bit 6 (XTAL1/TOSC1) |
| Chân 9 | PB5 — Port B bit 5 (SCK) |
| Chân 10 | PB4 — Port B bit 4 (MISO) |
| Chân 11 | PB3 — Port B bit 3 (MOSI/OC2A) |
| Chân 12 | PB2 — Port B bit 2 (SS/OC1B) |
| Chân 13 | PB1 — Port B bit 1 (OC1A) |
| Chân 14 | PB0 — Port B bit 0 (ICP1/CLKO) |
| Chân 15 | PD7 — Port D bit 7 (AIN1) |
| Chân 16 | PD6 — Port D bit 6 (AIN0) |
| Chân 17 | PD5 — Port D bit 5 (T1) |
| Chân 18 | PC6 — Port C bit 6 (RESET, active low) |
| Chân 19 | PC5 — Port C bit 5 (ADC5/SCL) |
| Chân 20 | PC4 — Port C bit 4 (ADC4/SDA) |
| Chân 21 | PC3 — Port C bit 3 (ADC3) |
| Chân 22 | PC2 — Port C bit 2 (ADC2) |
| Chân 23 | PC1 — Port C bit 1 (ADC1) |
| Chân 24 | PC0 — Port C bit 0 (ADC0) |
| Chân 25 | ADC7 — Analog input channel 7 |
| Chân 26 | AREF — Analog reference voltage |
| Chân 27 | GND — Ground |
| Chân 28 | AVCC — ADC supply voltage |
| Chân 29 | ADC6 — Analog input channel 6 |
| Chân 30 | PD0 — Port D bit 0 (RXD) |
| Chân 31 | PD1 — Port D bit 1 (TXD) |
| Chân 32 | PD2 — Port D bit 2 (INT0) |
Ứng dụng tiêu biểu
ATMEGA48PA-MNR phù hợp cho 6 Áp dụngs: Battery-Powered Sensor Nodes, Industrial Automation Slave Nodes, Consumer Appliance Control, Motor Control and PWM Drivers, Hobby, Maker and Educational Platforms, Medical and Health Monitoring Accessories.
Battery-Powered Sensor Nodes
The ATMEGA48PA-MNR is a strong fit for coin-cell and AA-powered wireless sensor nodes because its picoPower core draws very low current in Power-down sleep while the 20 MHz AVR core wakes quickly to sample sensors. In a typical node the MCU sleeps between radio or sensor transactions, samples a 10-bit ADC channel for temperature or humidity, then returns to sleep; the 4 KB Flash is usually sufficient for sensor drivers plus a simple protocol stack. Using the Watchdog Timer as a periodic wake source eliminates an external RTC, cutting BOM cost. The trade-off versus a dedicated low-power MCU is modest sleep current, but the PA generation narrows that gap substantially over the older ATmega48.
Được đề xuất
Industrial Automation Slave Nodes
In factory automation, the ATMEGA48PA-MNR serves as a Modbus-RTU or TWI slave node driving relays and reading limit switches. Its -40C to +105C rating per the Mouser listing tolerates control-cabinet heat near drives, and the 5 V operation at 20 MHz gives full-speed execution in electrically noisy 24 V environments. The USART handles RS-485 framing while SPI drives isolated ADCs or DACs. Because the 23 I/O lines replace several discrete glue-logic ICs, board area and cost drop. Designers should add TVS protection on RS-485 lines and use the 16-bit timer for precise PWM to actuators; the 4 KB Flash typically holds a compact protocol implementation with room to spare.
Được đề xuất
Consumer Appliance Control
White goods, small kitchen appliances, and HVAC controllers use the ATMEGA48PA-MNR for front-panel control: scanning a key matrix on PC0-PC3, driving 7-segment displays or LEDs, and reading NTC thermistors through the 10-bit ADC. The 4 KB Flash accommodates state machines and button debouncing typical of appliance firmware, while the six sleep modes let the product meet standby-power regulations. Cost per unit below USD 1.50 at 100 pieces (as of 2026-09-18) makes it competitive with dedicated 8-bit controllers. The watchdog timer provides the safety recovery required in appliances with heaters or motors, and the -40C to +105C range covers cooktop-adjacent electronics.
Được đề xuất
Motor Control and PWM Drivers
The ATMEGA48PA-MNR generates complementary PWM from its three timer/counters for brushed-DC and small BLDC fan control. The 16-bit Timer/Counter1 provides high-resolution phase-correct PWM while the two 8-bit timers handle tachometer capture and soft-start sequencing. Running at 20 MHz yields PWM frequencies well above audible range with 8-bit duty resolution. The 10-bit ADC reads back bus voltage and current via a shunt for closed-loop speed regulation. Its 105 C rating suits motor-adjacent mounting, though designers should keep the VQFN thermal pad well grounded. For larger three-phase drives, pair it with a dedicated gate driver rather than driving MOSFETs directly from I/O pins.
Được đề xuất
Hobby, Maker and Educational Platforms
The ATMEGA48PA-MNR is the budget core for maker boards and STEM kits: it runs the same AVR toolchain (AVR-GCC, Microchip Studio, arduprog-compatible ISP) as the famous Arduino-class parts, so educational material transfers directly. The 32-VQFN package suits compact custom boards while breakout adapters make hand soldering feasible with hot air. Its 1.8 V to 5.5 V range lets students power it from Li-ion, USB, or two AA cells without regulators. The 4 KB Flash is enough for blink, sensor-lab, and UART exercises, and when projects outgrow it, the identical pinout of ATMEGA88PA/168PA means the same PCB accepts a bigger chip - a valuable teaching path from intro to advanced embedded courses.
Được đề xuất
Medical and Health Monitoring Accessories
Portable health accessories - thermometers, pulse monitors, dosing timers - benefit from the ATMEGA48PA-MNR's low sleep current and ADC Noise Reduction sleep mode, which isolates the ADC clock domain for cleaner analog sampling of bridge sensors and bio-potential front ends. The 1.8 V operation supports single-cell coin batteries, extending product life, while the 20 MHz core handles FFT-based signal conditioning when awake. Six sleep modes let firmware aggressively power-gate between measurement cycles, which is the dominant duty cycle in intermittent-use medical accessories. Designers should follow the datasheet's analog grounding guidance (separate AVCC/AREF filtering) to achieve the ADC's datasheet noise performance in the compact VQFN layout.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ATMEGA48PA-MNR — 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 | ATMEGA48PB-MNR | ATMEGA48A-MNR | ATMEGA88PA-MNR | ATMEGA168PA-MNR |
|---|---|---|---|---|---|
| Package | 32-VQFN (MLF) 5x5 mm | 32-VQFN (MLF) 5x5 mm - same | 32-VQFN (MLF) 5x5 mm - same | 32-VQFN (MLF) 5x5 mm - same | 32-VQFN (MLF) 5x5 mm - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 4 KB | 4 KB | 4 KB | 8 KB | 16 KB |
| SRAM | 512 B | 512 B | 512 B | 1 KB | 1 KB |
| Max Clock | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| picoPower Technology | Yes | Yes (improved) | No | Yes | Yes |
| Pin 3 / Pin 6 Migration Cautions | N/A (baseline) | Pin 3: no active drive/ACO if grounded; Pin 6: no active drive if tied to VCC | None | None | None |
Bảo phân biệt quan trọng
- picoPower low-current core at lowest family price (vsATMEGA48A-MNR)
- Identical pinout to larger family members (vsATMEGA88PA-MNR)
- Officially supported migration to newer silicon (vsATMEGA48PB-MNR)
Ghi chú thiết kế
The 32-VQFN (MLF) 5x5 mm footprint places VCC/GND pad pairs inside the pad array (pins 3/4 and 5/6). Place one 100 nF X7R ceramic capacitor within 2 mm of each VCC pad and one bulk 4.7-10 uF capacitor near the supply entry. The center thermal pad on the MLF is soldered to a grounded land pattern - do not confuse it with the ATmega48PB migration caution on Pin 3/6 documented in Microchip appnote 00002605A when qualifying the PB as a drop-in.
The ATmega48PA supports 1.8 V to 5.5 V, but the maximum safe clock depends on supply: full 20 MHz is only guaranteed at 5 V (per the datasheet frequency-versus-VCC curve, below about 2.7 V the safe maximum drops toward 4-10 MHz). If your design runs at 3.3 V, verify the derating curve in the Microchip datasheet before configuring a 20 MHz crystal, or set the CKDIV8/system clock prescaler to stay within the safe operating envelope.
PC6 doubles as active-low RESET and is fused as RESET by default - do not assign it as a general I/O unless you reprogram the RSTDISBL fuse, which permanently disables ISP reprogramming. Additionally, when migrating to the ATMEGA48PB drop-in, pins 3 and 6 (GND/VCC in the PA pinout) have changed functionality: per appnote 00002605A, Pin 3 must not be actively driven if connected to GND and the ACO must not be enabled, and Pin 6 must not be actively driven if connected to VCC.
Thông tin tuân thủ
Green package per digchip listing ('GREEN, PLASTIC'); RoHS compliance per Microchip standard product page. REACH and conflict-minerals status not stated in provided data.
