ATMEGA329V-8MI - 8-bit AVR MCU, 32KB Flash, 8MHz, 64-QFN | Microchip
MPN: ATMEGA329V-8MI ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.45 | $8.45 |
| 10 | $7.62 | $76.20 |
| 100 | $6.83 | $683.00 |
| 500 | $6.1 | $3,050.00 |
| 1,000 | $5.45 | $5,450.00 |
ATMEGA329V-8MI Overview
An 8-bit AVR microcontroller is a Harvard-architecture single-chip MCU built around a RISC instruction set optimized for deterministic single-cycle execution. ATmega series parts integrate Flash program memory, SRAM, EEPROM, peripherals, and a core in one device; they sit in the product hierarchy between bare 8051 cores and 32-bit ARM Cortex-M0 microcontrollers, balancing code density, ease of use (free Atmel Studio / Microchip Studio toolchain), and ultra-low power consumption for embedded applications.
Key features include 130 powerful AVR instructions (most single-cycle), 32 x 8 general-purpose working registers, an 8-channel 10-bit ADC, hardware LCD controller supporting up to 40 segments, four PWM channels, two USARTs, an SPI interface, a TWI (I2C-compatible) interface, and an on-chip debugWIRE interface for in-system programming and debugging. The integrated LCD driver eliminates an external controller, reducing BOM cost in meter and instrument designs.
The architecture uses a pipelined RISC core achieving throughput approaching 1 MIPS per MHz. The nonvolatile program and data memories support in-system reprogramming via SPI or parallel programming, with at least 10,000 write/erase cycles endurance. Multiple sleep modes (Idle, Power-save, Power-down, Standby, Extended Standby) and a low-power RTC reduce quiescent current to a few microamps.
Typical applications include battery-powered utility meters, white goods and appliance HMIs, sensor front-ends with integrated LCD readouts, industrial control panels, and any embedded system requiring up to 32KB of self-programmable Flash with a built-in segmented LCD controller.
When designing with this MCU, note that the 'V' variant shares the same die and pinout as the non-'V' ATmega329 but limits maximum clock to 8MHz to guarantee operation down to 1.8V; code written for the 5V ATmega329 must respect the lower f_CPU ceiling.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the bare datasheet to accelerate your bring-up.
Drop-in alternatives for ATMEGA329V-8MI — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ATMEGA329V-8MI (same form factor and footprint) — differing in Package, ADC, Operating Temperature, LCD Controller, Communication Interfaces.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA329V-8AI
✅ Drop-In✓ In Stock
$4.45 / Unit
View Datasheet →ATMEGA329PV-10MUR
✅ Drop-In✓ In Stock
$3.99 / Unit
View Datasheet →ATMEGA329PA-MUR
✅ Drop-In✓ In Stock
$3.85 / Unit
View Datasheet →ATMEGA329A-MUR
✅ Drop-In✓ In Stock
$3.61 / Unit
View Datasheet →ATMEGA329-16AUR
✅ Drop-In✓ In Stock
$2.15 / Unit
View Datasheet →ATMEGA3290V-8AUR
✅ Drop-In✓ In Stock
$2.3 / Unit
View Datasheet →ATMEGA329V-8MI Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit AVR RISC |
| Program Memory (Flash) | 32 KB (16K x 16) |
| SRAM | 2 KB |
| EEPROM | 1 KB |
| Maximum Clock Frequency | 8 MHz |
| Operating Voltage | 1.8 V to 5.5 V (low-voltage 'V' variant) |
| Operating Temperature | -40 C to +85 C (industrial) |
| ADC | 8-channel, 10-bit |
| LCD Controller | Integrated, up to 40 segments |
| PWM Channels | 4 |
| USART | 2 |
| SPI | 1 (Master/Slave) |
| TWI (I2C-compatible) | 1 |
| Package | 64-pin QFN (9x9 mm) with exposed pad |
| I/O Pins | 54 programmable I/O lines |
| In-System Programming | Yes (SPI / debugWIRE) |
| RoHS Status | Compliant |
ATMEGA329V-8MI 64-pin qfn (9x9 mm) with exposed pad Pin Configuration Guide
Pin configuration for ATMEGA329V-8MI (64-pin qfn (9x9 mm) with exposed pad package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for ATMEGA329V-8MI.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA329V-8MI is suitable for 6 applications: Smart Electricity Meter with LCD Display, Appliance HMI Controller, Battery-Powered Sensor Reader with LCD, Industrial Control Panel Indicator, Medical Point-of-Care Diagnostic Reader, Automotive Aftermarket Gauge Cluster.
Smart Electricity Meter with LCD Display
The ATMEGA329V-8MI is purpose-built for single-phase smart electricity meters where an integrated segmented LCD controller directly drives the meter's display without an external driver IC. Its 1.8V-5.5V operation supports battery-backed RTC and metrology supply rails, while the 32KB Flash holds metering firmware plus DLMS/COSEM or Modbus protocol stacks. Eight ADC channels digitize voltage and current sensing front-ends (shunt or CT), and the on-chip debugWIRE interface enables in-field firmware updates via optical port. Low-power modes (Power-down draws a few microamps) extend battery life during brownouts.
Recommended
Appliance HMI Controller
Washing machines, dishwashers, and induction cookers use the ATMEGA329V-8MI as the front-panel HMI controller, driving 4x25 segment LCDs that show cycle status, temperature, and timer. Four PWM channels control motor triac firing or buzzer tones; the two USARTs link to a main appliance controller and a service diagnostic port. Operating from 1.8V allows direct connection to a 2xAA backup supply during power loss, preserving user settings stored in the 1KB EEPROM.
Recommended
Battery-Powered Sensor Reader with LCD
Field-portable data loggers for environmental, agricultural, or industrial sensor monitoring benefit from the ATMEGA329V-8MI's 1.8V operation, integrated LCD driver, and AVR low-power sleep modes. The 8-channel 10-bit ADC interrogates sensors (temperature, humidity, soil moisture) while TWI (I2C) connects to external digital sensors like the MCP9808. Two AA cells provide months of runtime thanks to Power-down currents under 1uA with RTC running, and 32KB Flash supports on-device data compression before bulk transmit via USART.
Recommended
Industrial Control Panel Indicator
Control panels for HVAC, access control, and pump stations deploy the ATMEGA329V-8MI to drive 7-segment-style LCDs showing setpoint, status icons, and alarm indicators. The 54 programmable I/O lines accommodate many mechanical or capacitive buttons, while the TWI interface links to a host PLC for supervisory commands. Industrial -40C to +85C temperature rating allows deployment in unheated control cabinets, and the 64-QFN compact footprint fits behind small LCD modules.
Recommended
Medical Point-of-Care Diagnostic Reader
Portable diagnostic devices (glucose meters, INR readers, hemoglobin analyzers) use the ATMEGA329V-8MI as the main controller because the integrated LCD controller directly drives the alphanumeric patient display, eliminating a costly external driver. The 32KB Flash accommodates assay calibration curves, EEPROM stores patient records, and the ADC digitizes colorimetric or electrochemical sensor outputs. Low-voltage operation enables primary-cell battery designs, while the -40C to +85C range suits field deployment.
Recommended
Automotive Aftermarket Gauge Cluster
Aftermarket automotive gauges (boost, oil pressure, EGT) leverage the ATMEGA329V-8MI's LCD driver and PWM channels for backlight dimming and warning beeps. While not AEC-Q100 qualified itself, the part is widely used in non-safety automotive accessories where industrial temperature range suffices. Four PWM outputs drive gauge stepper or servo motors, two USARTs interface with OBD-II adapters, and SPI connects to high-speed external ADC like the MCP3201 for fast sensor sampling.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA329V-8MI — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA329V-8AI | ATMEGA329PV-10MUR | ATMEGA329PA-MUR | ATMEGA329A-MUR | ATMEGA329-16AUR |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-QFN (9x9 mm) | 64-TQFP | 64-QFN | 64-QFN | 64-QFN | 64-TQFP |
| Flash | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB |
| Max Clock | 8 MHz | 8 MHz | 10 MHz | 20 MHz | 20 MHz | 16 MHz |
| Operating Voltage | 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 | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| LCD Controller | 4x25 segments | 4x25 segments | 4x25 segments | 4x25 segments | 4x25 segments | 4x25 segments |
| ADC Channels | 8 x 10-bit | 8 x 10-bit | 8 x 10-bit | 8 x 10-bit | 8 x 10-bit | 8 x 10-bit |
| Temperature Range | -40 C to +85 C (I grade) | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
Key Differentiators
- Lowest operating voltage in ATmega329 QFN family (vs ATMEGA329A-MUR)
- Lower active current at same clock (vs ATMEGA329-16AUR)
- Compact 9x9 mm QFN footprint (vs ATMEGA329V-8AI)
Design Notes
Estimated: Active current consumption at 3.3V, 8MHz, is approximately 5-6 mA; Power-down mode with RTC running drops below 1 uA. To preserve battery life in low-power designs, switch the system clock prescaler to divide-by-256 before entering Idle and use Power-down mode between sensor reads, waking via watchdog or external interrupt on INT0/INT1.
The 64-QFN package has an exposed thermal pad that must be soldered to a ground copper pour for mechanical reliability and thermal dissipation. Place a via array (4-9 vias, 0.3 mm drill, 0.5 mm pitch) under the pad to sink heat and reduce ground impedance. Decouple VCC and AVCC pins with 100 nF ceramic capacitors placed within 3 mm of each pin, plus a bulk 4.7-10 uF tantalum or ceramic on the main rail.
The 'V' low-voltage variant has a maximum clock of 8 MHz; code written for the 16 MHz or 20 MHz variants of ATmega329 will exceed timing budgets if reused as-is. Verify all UART baud-rate divisors, ADC prescaler settings, and timer overflow intervals against an 8 MHz F_CPU. Also note that in-system programming via debugWIRE requires the RESET pin to remain free of external pull-ups stronger than 10 kohm; the debugWIRE pin is multiplexed with the RESET pin.
Compliance Information
RoHS and REACH compliant per Microchip product page. Not AEC-Q100 qualified; this is an industrial-grade part. Use ATmega automotive-grade parts for AEC-Q100 designs.
