ATMEGA48PA-ANR - 8-Bit AVR MCU 4KB Flash 20MHz | Microchip
MPN： ATMEGA48PA-ANR ✓ 啟用中ATMEGA48PA-ANR 概覽
An 8-bit AVR microcontroller is a Harvard-architecture RISC processor that fetches and executes most of its 131 instructions in a single clock cycle. In the embedded system hierarchy, the ATmega family sits in the general-purpose MCU tier below the AVR DA/DB series and above the ATtiny line, and it integrates flash program memory, SRAM data memory, EEPROM, timers, USART, SPI, I2C (TWI), and a 10-bit ADC on a single silicon die.
Key features include the picoPower technology for ultra-low sleep currents, an advanced RISC core with 32 general-purpose working registers, three flexible timer/counters with compare modes, a 10-bit ADC with 8 multiplexed single-ended channels, and a programmable serial USART plus SPI and two-wire (I2C) interfaces. The device operates over 1.8V to 5.5V and tolerates industrial temperatures.
Architecturally, the ATmega48PA combines single-cycle ALU execution with in-system self-programmable flash, enabling field firmware updates via the ICSP interface or a bootloader. Power management modes (idle, ADC noise reduction, power-save, power-down, standby) let designers scale consumption from hundreds of microamps in active mode down to sub-microamp levels in power-down, which is why the picoPower variant suits battery-powered designs.
Typical applications include battery-powered sensor nodes, small home-automation and IoT controllers, industrial monitoring boards, and motor-control or LED-control auxiliaries where 4 KB of flash and a 20 MHz clock are sufficient.
Design consideration: keep the flash budget tight - at 4 KB there is little room for floating-point libraries, so prefer 8-bit fixed-point arithmetic and the supplied Atmel START/Microchip MPLAB X code examples to minimize code size.
This page synthesizes distributor pricing, drop-in family alternatives, pinout data, and practical design notes not consolidated in the manufacturer datasheet, verified as of 2026-09-18.
直接替換替代品，適用於 ATMEGA48PA-ANR — 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： ATMEGA48PA-ANR （相同外形與佔位） — 差異在於 EEPROM, Package, SRAM, Core Architecture, Operating Temperature.
ATMEGA48PB-AU
✅ 直接替換📋 參考替代品（不在目錄中）
ATMEGA88PA-AU
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATMEGA168PA-AU
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATMEGA328P-AU
✅ 直接替換聯絡詢價
查看資料表 →ATMEGA328PB-AU
✅ 直接替換聯絡詢價
查看資料表 →ATMEGA48-20AU
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATMEGA48PA-ANR 最大額定值與電氣特性
| Core Architecture | 8-bit AVR RISC |
| Flash Program Memory | 4 KB (2K x 16) |
| EEPROM | 256 B |
| SRAM | 512 B |
| 最大時脈頻率 | 20 MHz |
| Maximum MIPS | 20 MIPS (1 MIPS/MHz) |
| Supply Voltage Range | 1.8 V to 5.5 V |
| Number of I/O Lines | 23 |
| Timer/Counters | 3 (two 8-bit, one 16-bit) |
| ADC Resolution | 10-bit |
| ADC Channels | 8 single-ended multiplexed |
| Communication Interfaces | USART, SPI, TWI (I2C) |
| 工作溫度 | -40C to +85C (industrial) |
| 封裝 | 32-TQFP (7x7 mm), 0.8 mm pitch |
| 安裝類型 | Surface Mount |
| Programming Interface | ICSP (in-circuit serial programming) |
| Low Power Technology | picoPower |
| 生命週期狀態 | ACTIVE |
| RoHS 狀態 | Compliant (green package per digchip data) |
ATMEGA48PA-ANR 腳位配置
| 腳位 1 | PD3 (PCINT19/OC2B/INT1) — Port D, I/O pin with pin-change, PWM and external interrupt 1 functions |
| 腳位 2 | PD4 (PCINT20/XCK/T0) — Port D, I/O pin with external clock and timer 0 functions |
| 腳位 3 | GND — Ground |
| 腳位 4 | VCC — Digital supply voltage |
| 腳位 5 | GND — Ground |
| 腳位 6 | VCC — Digital supply voltage |
| 腳位 7 | PB6 (PCINT6/XTAL1/TOSC1) — Port B / crystal oscillator input or timer oscillator |
| 腳位 8 | PB7 (PCINT7/XTAL2/TOSC2) — Port B / crystal oscillator output |
| 腳位 9 | PD5 (PCINT21/OC0B/T1) — Port D, I/O pin with PWM output and timer 1 clock |
| 腳位 10 | PD6 (PCINT22/OC0A/AIN0) — Port D, PWM output and analog comparator positive input |
| 腳位 11 | PD7 (PCINT23/AIN1) — Port D, analog comparator negative input |
| 腳位 12 | PB0 (PCINT0/CLKO/ICP1) — Port B, clock output and timer 1 input capture |
| 腳位 13 | PB1 (PCINT1/OC1A) — Port B, 16-bit timer 1 PWM output A |
| 腳位 14 | PB2 (PCINT2/SS/OC1B) — Port B, SPI slave select and timer 1 PWM output B |
| 腳位 15 | PB3 (PCINT3/OC2A/MOSI) — Port B, SPI master output / timer 2 PWM output |
| 腳位 16 | PB4 (PCINT4/MISO) — Port B, SPI master input |
| 腳位 17 | PB5 (PCINT5/SCK) — Port B, SPI clock; also ICSP clock |
| 腳位 18 | AVCC — ADC supply voltage |
| 腳位 19 | ADC6 — ADC input channel 6 |
| 腳位 20 | AREF — Analog reference voltage |
| 腳位 21 | GND — Ground |
| 腳位 22 | ADC7 — ADC input channel 7 |
| 腳位 23 | PC0 (PCINT8/ADC0) — Port C, ADC channel 0 |
| 腳位 24 | PC1 (PCINT9/ADC1) — Port C, ADC channel 1 |
| 腳位 25 | PC2 (PCINT10/ADC2) — Port C, ADC channel 2 |
| 腳位 26 | PC3 (PCINT11/ADC3) — Port C, ADC channel 3 |
| 腳位 27 | PC4 (PCINT12/SDA/ADC4) — Port C, I2C data / ADC channel 4 |
| 腳位 28 | PC5 (PCINT13/SCL/ADC5) — Port C, I2C clock / ADC channel 5 |
| 腳位 29 | PC6 (PCINT14/RESET) — Reset input; also debugWIRE interface |
| 腳位 30 | PD0 (PCINT16/RXD) — Port D, USART receive |
| 腳位 31 | PD1 (PCINT17/TXD) — Port D, USART transmit |
| 腳位 32 | PD2 (PCINT18/INT0) — Port D, external interrupt 0 |
典型應用
ATMEGA48PA-ANR 適用於 6 應用s: Battery-Powered Sensor Nodes, Home Automation and IoT Controllers, Industrial Monitoring Boards, Motor and LED Control Auxiliary Boards, Consumer Appliances and White Goods, Hobby, Education, and Prototyping.
Battery-Powered Sensor Nodes
The ATMEGA48PA-ANR's picoPower technology makes it a strong fit for coin-cell or AA-powered sensor nodes: its power-down sleep mode reduces consumption to a fraction of a microamp, while the internal 8 MHz RC oscillator eliminates an external crystal and its associated drive current. A typical node wakes on pin-change or watchdog interrupt, reads a sensor through the 10-bit ADC, and transmits over a UART or SPI radio link before returning to sleep. With 4 KB of flash, compact sensing firmware fits comfortably, and the 1.8V minimum supply lets the MCU run directly from a near-depleted cell for maximum battery utilization.
推薦
Home Automation and IoT Controllers
For smart switches, plug-load monitors, and small IoT endpoints, the ATMEGA48PA-ANR provides the essential peripheral set in one chip: a USART for external radios, SPI for flash or RF transceivers, and TWI (I2C) for sensors and OLED displays. Operating at 5V it drives relays through a transistor stage directly, while the 10-bit ADC samples mains-voltage sense dividers for energy metering. The 20 MHz clock yields 20 MIPS, sufficient for polling multiple I2C devices and servicing a lightweight communication protocol. Its industrial -40C to +85C rating also covers unconditioned wall-box environments where consumer-grade parts fail.
推薦
Industrial Monitoring Boards
In industrial condition-monitoring and telemetry boards, the ATMEGA48PA-ANR's -40C to +85C industrial temperature range, wide 1.8V-5.5V supply tolerance, and brown-out detector give robust operation on noisy 24V-system-derived supplies. The 16-bit timer captures pulse inputs from flow meters or encoders with input-capture hardware, while the ADC with differential channels measures 4-20 mA loop-derived voltages. The ICSP interface permits field firmware updates on installed hardware, an important maintenance feature for deployed industrial equipment. Its 23 GPIO lines handle relay outputs, LED status banks, and DIP configuration switches without expansion logic.
推薦
Motor and LED Control Auxiliary Boards
The ATMEGA48PA-ANR suits small motor and LED control tasks: its two 8-bit timers and one 16-bit timer deliver up to four hardware PWM channels, enough for brushed-DC motor speed control via an H-bridge driver or for multi-channel constant-current LED dimming at 8-bit resolution. Running from 5V at 20 MHz, PWM frequencies well above the audible band are achievable, avoiding motor whine and LED flicker. The ADC reads back current-sense shunts for closed-loop limiting. Because the entire controller is a single low-cost IC, designers often parallel its PWM/ADC design pattern across product lines, reusing one firmware codebase.
推薦
Consumer Appliances and White Goods
Low-end appliance control - coffee makers, fans, small pumps, and heater interfaces - maps well onto the ATMEGA48PA-ANR: it offers debounce-handled GPIO for membrane keys, PWM for triac or MOSFET load control, the ADC for NTC temperature sensing, and an internal RC oscillator that removes crystal cost. The wide 1.8V-5.5V range allows operation directly from a cheap zener-derived supply, and the picoPower power-down mode suits always-plugged-in products with standby regulations. Tape-and-reel -ANR packaging supports high-volume pick-and-place assembly, and the RoHS-compliant green package meets consumer environmental requirements.
推薦
Hobby, Education, and Prototyping
The ATmega48PA shares the exact core, instruction set, and register model of the ATmega328P used in Arduino-class boards, making it an ideal low-cost teaching and prototyping part: students write the same AVR C/assembly code and graduate to larger flash sizes without relearning the architecture. Breadboard-friendly ICSP programming with the MPLAB SNAP or legacy AVRISP tools works directly with DIP-soldered family siblings, while the 32-TQFP -ANR version demonstrates real production packaging. The 4 KB flash constraint is itself educational, forcing efficient code - a valuable contrast to memory-rich development boards.
推薦
推薦產品摘要
工程參考資料，適用於 ATMEGA48PA-ANR — 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 | ATMEGA48PB-AU | ATMEGA88PA-AU | ATMEGA168PA-AU | ATMEGA328P-AU | ATMEGA328PB-AU | ATMEGA48-20AU |
|---|---|---|---|---|---|---|---|
| Package | 32-TQFP (7x7 mm) | 32-TQFP - same | 32-TQFP - same | 32-TQFP - same | 32-TQFP - same | 32-TQFP - same | 32-TQFP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 4 KB | 4 KB | 8 KB | 16 KB | 32 KB | 32 KB | 4 KB |
| SRAM | 512 B | 512 B | 1 KB | 1 KB | 2 KB | 2 KB | 512 B |
| EEPROM | 256 B | 256 B | 512 B | 512 B | 1 KB | 1 KB | 256 B |
| Max Clock Speed | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Supply Voltage | 1.8 V - 5.5 V | 1.8 V - 5.5 V | 1.8 V - 5.5 V | 1.8 V - 5.5 V | 1.8 V - 5.5 V | 1.8 V - 5.5 V | 2.7 V - 5.5 V (approx, non-picoPower) |
| picoPower Low Sleep Current | Yes | Yes (improved) | Yes | Yes | Yes | Yes | No (legacy core) |
| Peripheral Extras | Base ATmega48PA set | Enhanced PWM/timers | Base set + memory | Base set + memory | Base set + memory | 2x USART/I2C/SPI, extra PWM | Legacy base set |
主要差異化特點
- Lowest-cost entry point of the pin-compatible ATmega family (對比ATMEGA328P-AU)
- picoPower sleep currents for battery designs (對比ATMEGA48-20AU)
- Zero-PCB-change memory upgrades (對比ATMEGA88PA-AU / ATMEGA168PA-AU / ATMEGA328P-AU)
- Official forward migration path documented (對比ATMEGA48PB-AU)
設計說明
Decouple VCC (pins 4 and 6) with 100 nF ceramic capacitors placed within a few millimeters of the pins, and connect AVCC (pin 18) to VCC through a low-pass LC or ferrite filter when ADC accuracy matters - AVCC noise directly shifts ADC reference accuracy. Tie AREF (pin 20) to GND through a 100 nF capacitor when using internal reference, and never drive AREF while the internal reference is selected, per datasheet caution.
For battery designs, enable the brown-out detector conservatively: BOD adds continuous current, so prefer BOD disabled in power-down with watchdog-based wake, or use the BOD-disable-at-sleep fuse option on picoPower parts. Estimated: at a 1 Hz duty cycle where the MCU is active 1 ms per second at 1 mA active current, average current adds only about 1 uA, dominating the sleep-current budget - keep wake duration short to exploit picoPower benefits.
When migrating to ATMEGA48PB-AU as a drop-in replacement, Microchip appnote 00002605A warns: pin 3 (GND) must not be actively driven if connected to GND, and pin 6 (VCC) must not be actively driven if connected to VCC, or the analog comparator output (ACO) must not be enabled. Also remember the 4 KB flash includes bootloader space - verify code size headroom before enabling self-programming, and reserve RESET (pin 29) routing for debugWIRE access during development.
For ADC applications, keep analog traces (pins 19-28 region) short and away from PWM output lines PD5/PD6 and PB1/PB2, whose fast edges capacitively couple into high-impedance analog inputs. Use the ADC noise reduction sleep mode during conversions: it halts the core clock, cutting measurement noise. A ground plane under the TQFP with a single analog return point to GND (pin 21) measurably improves effective ADC resolution in noisy switching environments.
合規資訊
Green RoHS-compliant package indicated by digchip parameter data (GREEN PLASTIC package description). REACH, halogen-free and conflict-minerals status not stated in provided data.
