ATMEGA32A-MN - 8-bit AVR MCU 32KB Flash 44-VQFN | Microchip
Référence : ATMEGA32A-MN ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $5.62 | $5,62 |
| 10 | $5.18 | $51,80 |
| 100 | $4.62 | $462,00 |
| 500 | $4.15 | $2 075,00 |
| 1 000 | $3.74 | $3 740,00 |
ATMEGA32A-MN Présentation
An 8-bit AVR microcontroller is a RISC-based single-chip computer built around an enhanced Harvard architecture with separate program and data buses. Within the broader taxonomy, an MCU belongs to the embedded controller family (microcontroller -> embedded processor -> semiconductor IC). AVR cores are characterized by single-cycle instruction execution, large general-purpose register files, and rich on-chip peripherals (ADC, timers, USART, SPI, TWI), which is why AVR MCUs remain widely deployed in industrial control, hobbyist, and educational platforms.
Key features include 32 programmable I/O lines organized into four 8-bit ports, two 8-bit and one 16-bit timer/counters with separate prescalers and compare modes, a USART, a master/slave SPI interface, a byte-oriented TWI (I2C-compatible) interface, an analog comparator, and a programmable watchdog timer with on-chip oscillator. The device supports six sleep modes (Idle, ADC Noise Reduction, Power-save, Power-down, Standby, and Extended Standby) for low-power applications, with wake-up sources from external and internal interrupts.
The ATmega32A architecture combines a pipelined RISC core with non-volatile program memory, allowing self-programmability via a bootloader residing in the boot section. Memory Protection options and a JTAG/debugWIRE interface support both in-system programming and full on-chip debug, eliminating the need for external emulator hardware during firmware development.
Typical applications include industrial automation control boards, HVAC sensor interfaces, low-power sensor nodes, USB-to-UART bridge controllers, motor control BLDC/PMSM drivers (with companion 3-phase gate drivers), smart metering, white-goods user interfaces, and Arduino-compatible prototyping platforms. The wide 5V supply tolerance and proven AVR toolchain make the part particularly attractive for migrating legacy 8051 or PIC designs.
When designing with this device, allocate a stable 16 MHz external crystal (or use the internal 1 MHz / 8 MHz calibrated RC oscillator for cost-sensitive designs) and follow Atmel hardware-design considerations for analog and digital supply decoupling. Ensure JTAG pins are reserved or pulled appropriately if the debug interface is unused in production.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the standalone manufacturer datasheet.
Alternatives de remplacement direct pour ATMEGA32A-MN — 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 ATMEGA32A-MN (même facteur de forme et même empreinte) — différant par Core Architecture, Package, Debug Interface, Communication Interfaces, RoHS Status.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
ATMEGA32A-MNR
✅ Remplacement direct✓ En stock
$3.75 / unité
Voir la fiche technique →ATMEGA32A-MU
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ATMEGA32A-AU
✅ Remplacement direct ⚠️ Spécifications non vérifiées✓ En stock
$2.95 / unité
Voir la fiche technique →ATMEGA32A-AUR
✅ Remplacement direct ⚠️ Spécifications non vérifiées✓ En stock
$2.96 / unité
Voir la fiche technique →ATMEGA32A-AN
✅ Remplacement direct ⚠️ Spécifications non vérifiées✓ En stock
$3.4 / unité
Voir la fiche technique →ATMEGA32A-ANR
✅ Remplacement direct ⚠️ Spécifications non vérifiées✓ En stock
$3.32 / unité
Voir la fiche technique →ATMEGA32A-MN Valeurs maximales et caractéristiques électriques
| Core Architecture | 8-bit AVR RISC (enhanced Harvard) |
| Program Memory (Flash) | 32 KB (16K x 16) |
| SRAM | 2 KB |
| EEPROM | 1 KB |
| Maximum CPU Speed | 16 MHz |
| Supply Voltage (Vcc) | 4.5 V to 5.5 V |
| I/O Pins | 32 programmable |
| ADC | 8-channel, 10-bit |
| Timers/Counters | Two 8-bit, one 16-bit |
| Communication Interfaces | USART, SPI (master/slave), TWI (I2C) |
| On-chip Debug | JTAG / debugWIRE |
| Boîtier | 44-VQFN (7x7 mm) |
| Type de montage | Surface Mount |
| Instruction Set | 131 instructions, mostly single-cycle |
| Statut RoHS | Compliant |
Configuration des broches de ATMEGA32A-MN
| Broche 1 | PB5 (MOSI/DI) — Port B bit 5 / SPI MOSI |
| Broche 2 | PB6 (MISO/DO) — Port B bit 6 / SPI MISO |
| Broche 3 | PB7 (SCK) — Port B bit 7 / SPI SCK |
| Broche 4 | RESET — Reset input, active low |
| Broche 5 | VCC — Digital supply voltage |
| Broche 6 | GND — Digital ground |
| Broche 7 | XTAL2 — Crystal oscillator output |
| Broche 8 | XTAL1 — Crystal oscillator input |
| Broche 9 | PD0 (RXD) — Port D bit 0 / USART RXD |
| Broche 10 | PD1 (TXD) — Port D bit 1 / USART TXD |
| Broche 11 | PD2 (INT0) — Port D bit 2 / External Interrupt 0 |
| Broche 12 | PD3 (INT1) — Port D bit 3 / External Interrupt 1 |
| Broche 13 | PD4 (OC1B) — Port D bit 4 / Timer1 Compare B |
| Broche 14 | PD5 (OC1A) — Port D bit 5 / Timer1 Compare A |
| Broche 15 | PD6 (ICP1) — Port D bit 6 / Timer1 Input Capture |
| Broche 16 | PD7 (OC2) — Port D bit 7 / Timer2 Compare |
| Broche 17 | VCC — Digital supply voltage (second pin) |
| Broche 18 | GND — Digital ground (second pin) |
| Broche 19 | PC0 (SCL) — Port C bit 0 / TWI SCL |
| Broche 20 | PC1 (SDA) — Port C bit 1 / TWI SDA |
| Broche 21 | PC2 (TCK) — Port C bit 2 / JTAG TCK |
| Broche 22 | PC3 (TMS) — Port C bit 3 / JTAG TMS |
| Broche 23 | PC4 (TDO) — Port C bit 4 / JTAG TDO |
| Broche 24 | PC5 (TDI) — Port C bit 5 / JTAG TDI |
| Broche 25 | PC6 (TOSC1) — Port C bit 6 / Timer Oscillator pin 1 |
| Broche 26 | PC7 (TOSC2) — Port C bit 7 / Timer Oscillator pin 2 |
| Broche 27 | AVCC — Analog supply voltage |
| Broche 28 | AGND — Analog ground |
| Broche 29 | AREF — ADC reference voltage |
| Broche 30 | AVCC — Analog supply voltage (second pin) |
| Broche 31 | GND — Digital ground (third pin) |
| Broche 32 | PA7 (ADC7) — Port A bit 7 / ADC input 7 |
| Broche 33 | PA6 (ADC6) — Port A bit 6 / ADC input 6 |
| Broche 34 | PA5 (ADC5) — Port A bit 5 / ADC input 5 |
| Broche 35 | PA4 (ADC4) — Port A bit 4 / ADC input 4 |
| Broche 36 | PA3 (ADC3) — Port A bit 3 / ADC input 3 |
| Broche 37 | PA2 (ADC2) — Port A bit 2 / ADC input 2 |
| Broche 38 | PA1 (ADC1) — Port A bit 1 / ADC input 1 |
| Broche 39 | PA0 (ADC0) — Port A bit 0 / ADC input 0 |
| Broche 40 | VCC — Digital supply voltage (third pin) |
| Broche 41 | GND — Digital ground (fourth pin) |
| Broche 42 | PB0 — Port B bit 0 |
| Broche 43 | PB1 — Port B bit 1 |
| Broche 44 | PB2 (SS) — Port B bit 2 / SPI SS |
Applications typiques
ATMEGA32A-MN convient pour 6 applications: Industrial Automation Controller, HVAC Sensor Interface Board, Smart Metering Endpoint, Motor Control BLDC/PMSM Driver, USB-to-UART Bridge Controller, White Goods User Interface.
Industrial Automation Controller
The ATMEGA32A-MN fits industrial PLC and process-control boards that demand deterministic 8-bit response at 5 V. Its 32 KB Flash hosts Modbus/RTU slave stacks, 2 KB SRAM buffers telegrams, and the 8-channel 10-bit ADC reads 4-20 mA loops via current-sense amplifiers. The 16 MHz core delivers 16 MIPS, executing PID loops with sub-millisecond cycle times; 32 I/O lines drive relays, opto-isolators, and HMI keypads. JTAG debug allows in-system firmware updates; six sleep modes (down to <1 uA in Power-down) suit battery-backed controllers.
Recommandé
HVAC Sensor Interface Board
In HVAC climate-control boards, the ATMEGA32A-MN provides multi-channel temperature, humidity, and pressure acquisition via its 8-channel 10-bit ADC, while the TWI (I2C) bus attaches digital sensors like SHT3x and BMP280. The 5 V tolerance directly powers 4-20 mA loop transmitters and 24 V opto-isolated inputs through regulators. 32 KB Flash accommodates full BACnet or Modbus firmware plus bootloader; EEPROM stores calibration constants across power cycles. The VQFN-44 footprint suits wall-mount thermostat enclosures.
Recommandé
Smart Metering Endpoint
The ATMEGA32A-MN's 32 KB Flash and 1 KB EEPROM suit single-phase electricity, water, and gas meters that must log consumption over months. EEPROM retains tariff tables and tamper flags across blackouts; the 16-bit timer drives metrology pulse counting from AC zero-crossing or hall-effect sensors. The USART connects to PLC/RF modems (e.g. Sub-GHz transceivers) for AMR/AMI backhaul. Six power-saving modes reduce quiescent to <1 uA, extending battery life to 10+ years for non-mains meters.
Recommandé
Motor Control BLDC/PMSM Driver
In low-power BLDC and PMSM driver boards (fans, pumps, e-bike accessories), the ATMEGA32A-MN generates 6-step or sinusoidal PWM via its 16-bit Timer/Counter1 with hardware dead-time insertion, driving a 3-phase gate driver such as the IR2104 or DRV8301. The 16 MIPS throughput handles sensorless back-EMF zero-crossing detection at speeds up to ~30 krpm. ADC inputs measure phase currents and DC-bus voltage for closed-loop control; JTAG accelerates tuning of Kp/Ki gains. 5 V operation tolerates noisy 12-24 V bus environments.
Recommandé
USB-to-UART Bridge Controller
As a USB-to-UART bridge, the ATMEGA32A-MN can implement software USB (V-USB) on PORTD orbit-bang, translating between USB and its hardware USART for legacy RS-232 peripherals. 2 KB SRAM buffers HID or CDC-ACM packets; 32 KB Flash stores CDC stack plus DFU bootloader for field firmware upgrades via USB. The 16 MHz system clock matches the USB low-speed timing requirement. The VQFN-44 package enables compact dongle form factors; JTAG remains usable for bootloader development.
Recommandé
White Goods User Interface
In washing machines, dishwashers, and ovens, the ATMEGA32A-MN drives segment LCDs, capacitive touch keypads, and rotary encoder inputs while controlling relays and triac-fired heaters. The 32 I/O pins connect directly to LED bars, buzzer PWM, and door-lock sensors. 1 KB EEPROM stores user preferences and fault history; the analog comparator triggers brown-out reset on 5 V rail sag. Industrial temperature grade (-40 to +85 C) suits behind-panel mounting near heating elements. Flash self-programmability enables OTA feature updates via service port.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ATMEGA32A-MN — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | ATMEGA32A-MNR | ATMEGA32A-MU | ATMEGA32A-AU |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-VQFN (7x7 mm) | 44-VQFN (7x7 mm) - same | 44-VQFN (7x7 mm) - same | 44-TQFP (10x10 mm) - different footprint |
| Core | 8-bit AVR | 8-bit AVR | 8-bit AVR | 8-bit AVR |
| Flash Memory | 32 KB | 32 KB | 32 KB | 32 KB |
| SRAM | 2 KB | 2 KB | 2 KB | 2 KB |
| EEPROM | 1 KB | 1 KB | 1 KB | 1 KB |
| Maximum Clock Speed | 16 MHz | 16 MHz | 16 MHz | 16 MHz |
| Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V |
| I/O Pins | 32 | 32 | 32 | 32 |
| Temperature Grade | Industrial (-40 to +85 C) | Industrial (-40 to +85 C) | Commercial (0 to +70 C) | Industrial (-40 to +85 C) |
Principaux différenciateurs
- Industrial temperature grade in compact 44-VQFN (vs ATMEGA32A-MU)
- Compact leadless footprint saves board area (vs ATMEGA32A-AU)
- Standard tray packaging for low-volume prototyping (vs ATMEGA32A-MNR)
Notes de conception
The ATMEGA32A-MN requires a stable 4.5-5.5 V supply at the VCC pins (5, 17, 40) and AVCC (27, 30). Place a 100 nF decoupling capacitor within 5 mm of each VCC/AVCC pin and a 10 uF bulk capacitor at the regulator output. AVCC and VCC should be tied together at the IC, but route AVCC through a ferrite bead if analog accuracy is required. Estimated quiescent current in Power-down mode is <1 uA at 5 V per the datasheet's DC characteristics table.
The 44-VQFN (7x7 mm) package uses a center exposed pad (EP) that must be soldered to a PCB thermal pad of at least equal size for mechanical reliability. Connect the EP to digital ground to provide a thermal path; missing this pad reduces solder joint life and may cause thermal-failure under high CPU load. Maintain a 0.4 mm trace-and-space clearance around the EP vias (typically 4-9 thermal vias in a 3x3 array) to avoid solder wicking.
Do not leave JTAG pins floating in production: either disable the JTAGEN fuse via ISP/STK500 to release PORTC for general I/O, or add 10 kohm pull-ups on TCK/TMS/TDO/TDI to prevent spurious debug entry. Crystal load capacitors should be selected per the crystal's CL specification (typically 12-22 pF), not generic 22 pF. For low-EMI designs, place the crystal within 5 mm of XTAL1/XTAL2 and guard the traces with a ground pour.
Informations de conformité
RoHS compliant per Microchip product page; not AEC-Q100 qualified (choose ATMEGA32A-AUR automotive variant if needed).