ATMEGA48-20AI - 8-bit AVR MCU, 4KB Flash, 20MHz | Microchip
Référence : ATMEGA48-20AI ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $1.62 | $1,62 |
| 10 | $1.45 | $14,50 |
| 100 | $1.18 | $118,00 |
| 500 | $0.98 | $490,00 |
| 1 000 | $0.82 | $820,00 |
ATMEGA48-20AI Présentation
An 8-bit microcontroller is a single-chip processor that executes instructions, controls peripherals, and interfaces with sensors and actuators on a single silicon die. The ATMEGA48 belongs to the AVR family within the broader hierarchy of MCU -> embedded processor -> semiconductor, and integrates Flash program memory, SRAM data memory, EEPROM nonvolatile storage, and analog peripherals into one package, eliminating external memory chips in cost-sensitive embedded designs.
Key features include the AVR enhanced RISC core executing 131 powerful instructions, most in a single clock cycle; 1.8V to 5.5V operation; an 8-channel 10-bit ADC; and three flexible timer/counters. The 32 general purpose working registers are directly connected to the arithmetic logic unit, allowing one-cycle access that boosts effective throughput far beyond classic CISC MCUs at the same clock rate.
Technical depth: the ATMEGA48 supports self-programming Flash with an in-system programming (ISP) interface and includes debugWIRE, an on-chip debug system that uses only one pin, preserving I/O for the application. Peripherals include SPI and TWI (I2C-compatible) serial interfaces, a USART, analog comparator, and watchdog timer with its own oscillator.
Typical applications include consumer appliance control, industrial sensor nodes, motor control front-ends, and battery-powered devices that exploit the AVR picoPower-class sleep modes and 1.8V low-voltage operation.
Design consideration: the ATMEGA48-20AI is rated to 20MHz at 4.5V-5.5V; at lower supply voltages the maximum safe clock frequency derates, so verify the voltage-frequency curve in the datasheet before fixing the crystal.
This page synthesizes distributor availability, same-family drop-in alternatives, and practical design notes not consolidated in the manufacturer datasheet.
Alternatives de remplacement direct pour ATMEGA48-20AI — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec ATMEGA48-20AI (même facteur de forme et même empreinte) — différant par Package, Core Architecture, ADC, Timer/Counters, EEPROM.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
ATMEGA48-20AU
✅ Remplacement direct✓ En stock
$1.68 / unité
Voir la fiche technique →ATMEGA48P-20AU
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ATMEGA48V-10AU
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ATMEGA88-20AU
✅ Remplacement direct✓ En stock
$2.33 / unité
Voir la fiche technique →ATMEGA168-20AU
✅ Remplacement direct✓ En stock
$1.82 / unité
Voir la fiche technique →ATMEGA48-20AI Valeurs maximales et caractéristiques électriques
| Core Architecture | AVR 8-bit RISC |
| Flash Program Memory | 4 KB (2K x 16), ISP self-programming |
| SRAM | 512 B |
| EEPROM | 256 B |
| Maximum CPU Speed | 20 MHz (up to 20 MIPS) |
| Supply Voltage Range | 1.8 V to 5.5 V |
| GPIO Count | 23 general purpose I/O lines |
| ADC | 8-channel, 10-bit |
| Timer/Counters | 3 (two 8-bit, one 16-bit) |
| Serial Interfaces | SPI, TWI (I2C-compatible), USART |
| On-Chip Debug | debugWIRE |
| Température de fonctionnement | -40C to +85C (Industrial) |
| Boîtier | 32-TQFP, 7x7 mm, square, gull-wing leads |
| Type de montage | Surface Mount |
| Temperature Grade | Industrial |
| Statut RoHS | Green (per distributor data) |
Configuration des broches de ATMEGA48-20AI
| Broche 1 | PD3 — Port D bit 3 (PCINT19/INT1/OC2B/ADC3) |
| Broche 2 | PD4 — Port D bit 4 (PCINT20/XCK/T0/ADC4) |
| Broche 3 | GND — Ground |
| Broche 4 | VCC — Digital supply voltage |
| Broche 5 | GND — Ground |
| Broche 6 | VCC — Digital supply voltage |
| Broche 7 | PB6 — Port B bit 6 (PCINT6/XTAL1/TOSC1) |
| Broche 8 | PB7 — Port B bit 7 (PCINT7/XTAL2/TOSC2) |
| Broche 9 | PD5 — Port D bit 5 (PCINT21/OC0B/T1/ADC5) |
| Broche 10 | PD6 — Port D bit 6 (PCINT22/OC0A/AIN0/ADC6) |
| Broche 11 | PD7 — Port D bit 7 (PCINT23/AIN1) |
| Broche 12 | PB0 — Port B bit 0 (PCINT0/CLKO/ICP1) |
| Broche 13 | PB1 — Port B bit 1 (PCINT1/OC1A) |
| Broche 14 | PB2 — Port B bit 2 (PCINT2/SS/OC1B) |
| Broche 15 | PB3 — Port B bit 3 (PCINT3/MOSI/OC2A) |
| Broche 16 | PB4 — Port B bit 4 (PCINT4/MISO) |
| Broche 17 | PB5 — Port B bit 5 (PCINT5/SCK) |
| Broche 18 | AVCC — ADC supply voltage |
| Broche 19 | ADC6 — ADC input channel 6 |
| Broche 20 | AREF — Analog reference voltage |
| Broche 21 | GND — Ground |
| Broche 22 | ADC7 — ADC input channel 7 |
| Broche 23 | PC0 — Port C bit 0 (PCINT8/ADC0) |
| Broche 24 | PC1 — Port C bit 1 (PCINT9/ADC1) |
| Broche 25 | PC2 — Port C bit 2 (PCINT10/ADC2) |
| Broche 26 | PC3 — Port C bit 3 (PCINT11/ADC3) |
| Broche 27 | PC4 — Port C bit 4 (PCINT12/ADC4/SDA) |
| Broche 28 | PC5 — Port C bit 5 (PCINT13/ADC5/SCL) |
| Broche 29 | PC6 — Port C bit 6 (PCINT14/RESET) |
| Broche 30 | PD0 — Port D bit 0 (PCINT16/RXD) |
| Broche 31 | PD1 — Port D bit 1 (PCINT17/TXD) |
| Broche 32 | PD2 — Port D bit 2 (PCINT18/INT0) |
Applications typiques
ATMEGA48-20AI convient pour 6 applications: Consumer Appliance Control, Industrial Sensor Nodes, Battery-Powered Portable Devices, Motor Control and PWM Drive, IoT and Smart Home Edge Nodes, Test and Measurement Accessories.
Consumer Appliance Control
The ATMEGA48-20AI fits appliance control boards such as coffee machines, fans, and small heaters where a low-cost MCU drives buttons, LEDs, and a triac or relay. Its 4KB Flash is sufficient for state machines, debounce logic, and PWM heater or motor control, while 23 GPIO lines cover keypad scanning and indicator multiplexing without port expanders. The 10-bit ADC reads NTC thermistors or user potentiometers with 8 selectable channels. Operating from a 5V linear rail, the 20MHz core leaves ample timing headroom for precise zero-cross switching via the external interrupt pins. Because the ATmega48/88/168 family shares one pinout, manufacturers can scale firmware between 4KB, 8KB, and 16KB SKUs on the same PCB, reducing qualification cost across product tiers.
Recommandé
Industrial Sensor Nodes
In industrial sensing nodes, the ATMEGA48-20AI converts sensor signals through its 8-channel 10-bit ADC and streams results over SPI, TWI (I2C), or USART. The -40C to +85C industrial temperature rating matches factory-floor and outdoor cabinet environments where commercial-grade parts drift or fail. The 1.8V-5.5V supply range permits direct operation from 24V backplanes via a simple LDO without regulator redesign across platforms. Its watchdog timer with dedicated on-chip oscillator provides autonomous fault recovery in unattended installations, while debugWIRE allows field engineers to debug through a single wire on the populated board. The 20 MIPS throughput handles oversampling, averaging, and CRC-checked communication framing within the same 10ms sampling budget, keeping external glue logic to nearly zero.
Recommandé
Battery-Powered Portable Devices
For battery-operated products such as handheld meters and remote controls, the ATMEGA48-20AI operates from 1.8V to 5.5V, spanning two alkaline cells through a Li-Ion cell without a boost converter. The AVR power management system offers idle, ADC noise reduction, power-save, power-down, and standby sleep modes, letting the MCU sleep between user events and wake on pin-change interrupts in microseconds. The 256B EEPROM stores calibration data and user settings through thousands of erase-write cycles, eliminating external nonvolatile memory. Where sleep current dominates the duty cycle, the pin-compatible ATMEGA48P-20AU picoPower variant drops standby consumption further while preserving the same 32-TQFP footprint and firmware portability. The 10-bit ADC and analog comparator support front-end measurements directly on-chip.
Recommandé
Motor Control and PWM Drive
The ATMEGA48-20AI generates motor drive waveforms using its three flexible timer/counters: two 8-bit timers with two output-compare PWM channels each and one 16-bit timer for high-resolution PWM or input capture. At 20MHz, an 8-bit PWM achieves roughly 78kHz carrier frequency, comfortably above audible range for DC fan and small brushless motor control. The dead-time generation and output-compare pins drive half-bridge gate drivers through GPIO, while the 10-bit ADC monitors current via a shunt and the analog comparator provides fast over-current trip without CPU intervention. The 16-bit timer's input-capture unit measures tachometer periods for closed-loop speed regulation. With 23 GPIO lines, one ATMEGA48 can control multiple motors plus limit switches and status LEDs on a single low-cost TQFP-32 device.
Recommandé
IoT and Smart Home Edge Nodes
Smart home nodes such as wall switches, thermostat add-ons, and RF module hosts use the ATMEGA48-20AI as a low-cost controller that bit-bangs or hardware-drives sub-GHz and 2.4GHz radio modules over SPI. The 20 MIPS throughput runs lightweight protocol stacks for sensor reporting, while the USART bridges to Wi-Fi or Zigbee modules. Sleep modes extend coin-cell and AA-battery life by remaining in power-down between transmissions, waking on radio IRQ via pin-change interrupts. The 4KB Flash accommodates application logic plus a minimal OTA-style bootloader in the self-programming Flash, enabling field firmware updates through TWI or SPI-attached external EEPROM. Designers retain an upgrade path: the identical pinout accepts ATMEGA88 or ATMEGA168 parts when feature growth demands more memory, with no PCB respin.
Recommandé
Test and Measurement Accessories
Low-cost test accessories such as logic probes, dongle-style data loggers, and calibration adapters benefit from the ATMEGA48-20AI's deterministic single-cycle instruction execution, which produces predictable GPIO timing at the 20MHz core clock. debugWIRE enables real-time register and memory inspection through the RESET line on the assembled board, a significant advantage for verifying timing-critical firmware without dedicating pins to a JTAG port. The 10-bit ADC with internal reference digitizes battery voltage and probe status, while the USART reports streamed measurements to a PC at standard baud rates. The industrial temperature rating allows use in outdoor instrumentation enclosures. Because program memory is self-programmable, a host can update accessory firmware over the existing serial link, extending product life without hardware recalls or service interventions.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ATMEGA48-20AI — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | ATMEGA48-20AU | ATMEGA48P-20AU | ATMEGA48V-10AU | ATMEGA88-20AU | ATMEGA168-20AU |
|---|---|---|---|---|---|---|
| Package | 32-TQFP (7x7) | 32-TQFP (7x7) - same | 32-TQFP (7x7) - same | 32-TQFP (7x7) - same | 32-TQFP (7x7) - same | 32-TQFP (7x7) - same |
| Brand | Microchip Technology (Atmel) | Microchip Technology (Atmel) | Microchip Technology (Atmel) | Microchip Technology (Atmel) | Microchip Technology (Atmel) | Microchip Technology (Atmel) |
| Flash Program Memory | 4 KB | 4 KB | 4 KB | 4 KB | 8 KB | 16 KB |
| SRAM | 512 B | 512 B | 512 B | 512 B | 1 KB | 1 KB |
| EEPROM | 256 B | 256 B | 256 B | 256 B | 512 B | 512 B |
| Maximum CPU Speed | 20 MHz | 20 MHz | 20 MHz | 10 MHz | 20 MHz | 20 MHz |
| 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 |
| Power Technology | Standard AVR power profile | Standard AVR power profile | picoPower (reduced sleep currents) | Low-voltage/low-speed profile | Standard AVR power profile | Standard AVR power profile |
Principaux différenciateurs
- Lowest cost in the ATmega48/88/168 family (vs ATMEGA88-20AU)
- Full 20MHz speed rating (vs ATMEGA48V-10AU)
- Standard power profile availability (vs ATMEGA48P-20AU)
Notes de conception
Decouple both VCC pins (4 and 6) and AVCC (pin 18) individually with 100nF ceramic capacitors placed within 5 mm of each pin, plus one 10uF bulk capacitor near the device. AVCC must be connected to VCC even if the ADC is unused, per the Atmel ATmega48/88/168 datasheet; when the ADC is active, filter AVCC through an LC network (10uH inductor with 100nF) to keep converter noise below the 10-bit LSB level. AREF should use an external 100nF capacitor to ground and never be driven while the internal reference is selected.
The 20MHz speed grade is guaranteed only near the top of the 4.5V-5.5V supply range; the datasheet maximum-frequency-versus-VCC curve derates the safe clock at lower voltages. Running a 20MHz crystal at 3.3V violates the derating curve and causes marginal, temperature-dependent failures. Also note PC6 doubles as active-low RESET: enabling debugWIRE frees it, but once fuse RSTDISBL is programmed, high-voltage parallel programming is the only recovery path. Verify fuse settings (CKDIV8, CKOUT) before flashing production units.
Keep the crystal or resonator on PB6/PB7 within 10 mm of the device with short, symmetrical traces and local ground return; route other signals away from the oscillator nets. The exposed TQFP lead frame needs no thermal pad, but use a solid ground plane under the part to contain ADC switching noise. For ISP programming, add the standard 6-pin (2x3, 2.54 mm) header on MOSI/MISO/SCK/RESET with 10k pull-up on RESET, ensuring downstream loads on RESET do not exceed the datasheet sink requirement during programming.
Informations de conformité
Distributor data lists the part as GREEN (RoHS) packaging; REACH and conflict-minerals status should be confirmed on the Microchip compliance portal.
