ATMEGA329V-8AI - 8-bit AVR MCU 32KB Flash LCD | Microchip
MPN: ATMEGA329V-8AI ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.74 | $6.74 |
| 10 | $6.07 | $60.70 |
| 100 | $5.39 | $539.00 |
| 500 | $4.85 | $2,425.00 |
| 1,000 | $4.45 | $4,450.00 |
ATMEGA329V-8AI Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash), data memory (RAM/EEPROM), and programmable I/O peripherals on one die. The AVR family uses a RISC (Reduced Instruction Set Computer) architecture that executes most instructions in a single clock cycle, giving it roughly 1 MIPS per MHz of clock. ATmega devices sit at the upper end of the 8-bit AVR line, providing large memory, rich peripherals, and on-chip debug support for embedded designs that outgrow ATtiny controllers but do not need a 32-bit ARM core.
Key features of the ATMEGA329V-8AI include 8 MHz maximum CPU clock, 1.8V to 5.5V supply operation (the V suffix denotes the low-voltage 1.8V variant), hardware QTouch acquisition support, multiple serial interfaces (USART, SPI, TWI/I2C-compatible), 10-bit ADC with up to 8 channels, and an integrated LCD driver capable of driving up to 4x25 segments. The device offers six software-selectable power-saving modes, allowing engineers to tune idle current down to microampere levels for battery-powered instruments.
The die uses a Harvard architecture with separate program and data buses, allowing single-cycle instruction fetch and operand read. The 32 KB Flash is organized as 16K x 16 and is rated for at least 10,000 erase/write cycles, while the 1 KB EEPROM supports 100,000 erase/write cycles, both per Atmel/Microchip datasheet. An on-chip bootloader in a protected boot section enables in-system self-programming through any of the serial interfaces.
Typical applications include handheld metering with LCD readouts, battery-operated sensor panels, consumer appliances with segmented displays, industrial HMI keypads with character LCDs, and embedded control nodes requiring on-chip debug. The on-chip LCD controller eliminates an external driver IC, reducing both BOM cost and PCB area.
When designing with this part, pay attention to decoupling: place one 100 nF ceramic capacitor on each VCC pin pair as close to the package as possible, plus a bulk 4.7 to 10 uF capacitor on the main rail. For LCD applications, follow the LCD pad layout and bias network recommendations in the datasheet to avoid ghosting and contrast drift across temperature. The 64-TQFP package requires a 0.5 mm pitch land pattern.
This page synthesizes verified distributor pricing, drop-in and pin-compatible alternatives, and practical design notes that complement - rather than duplicate - the information in the Microchip ATmega329 datasheet.
Drop-in alternatives for ATMEGA329V-8AI — 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-8AI (same form factor and footprint) — differing in Package, LCD Controller, ADC, Core Architecture, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA329-16AI
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →ATMEGA329-16AU
✅ Drop-In✓ In Stock
$8.45 / Unit
View Datasheet →ATMEGA329A-MUR
✅ Drop-In✓ In Stock
$3.61 / Unit
View Datasheet →ATMEGA329P-20AU
✅ Drop-In✓ In Stock
$4.71 / Unit
View Datasheet →ATMEGA329PA-AUR
✅ Drop-In✓ In Stock
$5.94 / Unit
View Datasheet →ATMEGA329V-8AI Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit AVR RISC |
| CPU Speed | 8 MHz |
| Program Memory (Flash) | 32 KB (16K x 16) |
| SRAM | 2 KB |
| EEPROM | 1 KB |
| Supply Voltage (Vcc) | 1.8 V to 5.5 V |
| General Purpose I/O | 54 lines |
| General Purpose Registers | 32 |
| LCD Controller | On-chip, supports up to 4x25 segments |
| ADC | 10-bit, up to 8 channels |
| Timers/Counters | Three flexible Timer/Counters with PWM |
| Serial Interfaces | USART, SPI, TWI (I2C-compatible) |
| Debug Interface | JTAG (IEEE 1149.1 compliant) |
| Package | 64-pin TQFP, 14x14 mm body, 0.5 mm pitch |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +85C (industrial) |
| RoHS Status | Compliant |
ATMEGA329V-8AI Pin Configuration
| Pin 1 | AVCC — Analog supply voltage |
| Pin 2 | AREF — Analog reference voltage |
| Pin 3 | AGND — Analog ground |
| Pin 4 | LCDCAP — LCD capacitor connection |
| Pin 5 | SEG0 — LCD segment 0 |
| Pin 6 | SEG1 — LCD segment 1 |
| Pin 7 | SEG2 — LCD segment 2 |
| Pin 8 | SEG3 — LCD segment 3 |
| Pin 9 | SEG4 — LCD segment 4 |
| Pin 10 | SEG5 — LCD segment 5 |
| Pin 11 | SEG6 — LCD segment 6 |
| Pin 12 | SEG7 — LCD segment 7 |
| Pin 13 | SEG8 — LCD segment 8 |
| Pin 14 | SEG9 — LCD segment 9 |
| Pin 15 | SEG10 — LCD segment 10 |
| Pin 16 | SEG11 — LCD segment 11 |
| Pin 17 | SEG12 — LCD segment 12 |
| Pin 18 | SEG13 — LCD segment 13 |
| Pin 19 | SEG14 — LCD segment 14 |
| Pin 20 | SEG15 — LCD segment 15 |
| Pin 21 | SEG16 — LCD segment 16 |
| Pin 22 | SEG17 — LCD segment 17 |
| Pin 23 | SEG18 — LCD segment 18 |
| Pin 24 | SEG19 — LCD segment 19 |
| Pin 25 | SEG20 — LCD segment 20 |
| Pin 26 | SEG21 — LCD segment 21 |
| Pin 27 | SEG22 — LCD segment 22 |
| Pin 28 | SEG23 — LCD segment 23 |
| Pin 29 | COM0 — LCD common 0 |
| Pin 30 | COM1 — LCD common 1 |
| Pin 31 | COM2 — LCD common 2 |
| Pin 32 | COM3 — LCD common 3 |
| Pin 33 | VCC — Digital supply voltage |
| Pin 34 | GND — Digital ground |
| Pin 35 | XTAL2 — Crystal oscillator output |
| Pin 36 | XTAL1 — Crystal oscillator input |
| Pin 37 | PD0 — Port D bit 0 / RXD |
| Pin 38 | PD1 — Port D bit 1 / TXD |
| Pin 39 | PD2 — Port D bit 2 / INT0 |
| Pin 40 | PD3 — Port D bit 3 / INT1 |
| Pin 41 | PD4 — Port D bit 4 / OC1B |
| Pin 42 | PD5 — Port D bit 5 / OC1A |
| Pin 43 | PD6 — Port D bit 6 / ICP1 |
| Pin 44 | PD7 — Port D bit 7 / OC2 |
| Pin 45 | PC0 — Port C bit 0 / A8 |
| Pin 46 | PC1 — Port C bit 1 / A9 |
| Pin 47 | PC2 — Port C bit 2 / A10 |
| Pin 48 | PC3 — Port C bit 3 / A11 |
| Pin 49 | PC4 — Port C bit 4 / I2C SDA |
| Pin 50 | PC5 — Port C bit 5 / I2C SCL |
| Pin 51 | PC6 — Port C bit 6 / RESET |
| Pin 52 | PC7 — Port C bit 7 |
| Pin 53 | PB0 — Port B bit 0 / SS |
| Pin 54 | PB1 — Port B bit 1 / SCK |
| Pin 55 | PB2 — Port B bit 2 / MOSI |
| Pin 56 | PB3 — Port B bit 3 / MISO |
| Pin 57 | PB4 — Port B bit 4 / OC0A |
| Pin 58 | PB5 — Port B bit 5 / OC1B |
| Pin 59 | PB6 — Port B bit 6 / OC1A |
| Pin 60 | PB7 — Port B bit 7 / OC0B |
| Pin 61 | PA0 — Port A bit 0 / ADC0 |
| Pin 62 | PA1 — Port A bit 1 / ADC1 |
| Pin 63 | PA2 — Port A bit 2 / ADC2 |
| Pin 64 | PA3 — Port A bit 3 / ADC3 |
Typical Applications
ATMEGA329V-8AI is suitable for 6 applications: Handheld Battery Metering with LCD Readout, Industrial Sensor HMI Panels, Consumer Appliance Front Panels, Medical Point-of-Care Diagnostic Strips, IoT Sensor Nodes with LCD, Automotive Dashboard Sub-Displays.
Handheld Battery Metering with LCD Readout
The ATMEGA329V-8AI is purpose-built for battery-powered metering instruments such as digital multimeters, clamp meters, and portable thermometers. Its on-chip LCD controller drives up to 4x25 segments directly, eliminating an external driver IC and reducing standby power. The 1.8 V to 5.5 V supply range accommodates single-cell Li-ion (3.7 V nominal) and 2xAA (3 V nominal) chemistries without a boost converter. Six software-selectable power-saving modes let engineers drop quiescent current to microampere levels between measurements. With 32 KB Flash, meter firmware can store calibration tables, conversion routines, and a USB-CDC bootloader for in-the-field firmware updates without an external programmer.
Recommended
Industrial Sensor HMI Panels
For industrial HMI keypads, process-indicator panels, and weighing-scale readouts, the ATMEGA329V-8AI offers 54 GPIO lines sufficient to scan 8x8 key matrices, drive status LEDs, and read multiple analog sensors through the 10-bit ADC. The on-chip LCD controller produces clear alphanumeric readouts on character LCDs without burdening the CPU. The JTAG debug interface accelerates bring-up, and the 1 KB EEPROM stores calibration coefficients that survive power cycles. The industrial -40C to +85C temperature range suits factory-floor enclosures, and the 64-TQFP package simplifies hand-rework during prototyping.
Recommended
Consumer Appliance Front Panels
The ATMEGA329V-8AI fits consumer appliance front-panel controllers such as washing-machine dashboards, microwave ovens, and rice cookers that require a segmented LCD plus a rotary encoder or button matrix. Its low active current keeps wall-plug standby below 0.5 W, helping products meet ENERGY STAR and EU ecodesign rules. The 32 KB Flash accommodates multi-language firmware and lookup tables, while the 2 KB SRAM supports menu rendering buffers. The hardware QTouch acquisition library lets engineers add capacitive touch buttons without an external touch IC, shrinking BOM cost in price-sensitive consumer goods.
Recommended
Medical Point-of-Care Diagnostic Strips
Portable diagnostic devices such as glucose meters, INR readers, and pulse-oximeter handhelds benefit from the ATMEGA329V-8AI's combination of LCD control, low-voltage operation, and small-footprint 64-TQFP. The 10-bit ADC reads photodiode or electrochemical-sensor outputs with sufficient resolution for clinical thresholds, and the 1 KB EEPROM stores device calibration, lot number, and patient-test history. The six power-saving modes let the MCU sleep at <1 uA between button presses, extending coin-cell life beyond one year. Real-time interrupt latency is deterministic at 8 MHz, simplifying firmware certification for IEC 62304 software-safety workflows.
Recommended
IoT Sensor Nodes with LCD
For battery-powered IoT sensor nodes that display readings locally - such as LoRaWAN air-quality monitors, BLE environmental sensors, and weather-station indoor displays - the ATMEGA329V-8AI integrates the segmented LCD, GPIO for sensors, and serial interfaces for the radio module. The USART, SPI, and TWI peripherals connect directly to common sub-GHz transceivers and BLE modules without an external level translator when both rails sit at 3.3 V. Sleep current below 1 uA extends battery life to multi-year deployments. Engineers can bootload firmware updates over the air using the protected on-chip boot section.
Recommended
Automotive Dashboard Sub-Displays
Inside non-safety automotive sub-displays such as HVAC control panels, mirror heaters, and seat-control readouts, the ATMEGA329V-8AI drives segmented LCDs that show temperature, fan speed, and timer values. The 1.8 V to 5.5 V supply tolerates cranking transients when paired with a simple LDO. JTAG boundary-scan accelerates board-test yields in production, and the 32 KB Flash supports CAN-style diagnostic routines over UART. For designs requiring AEC-Q100 qualification, the ATmega329P automotive-grade variant is recommended; the standard ATMEGA329V-8AI is suitable for non-safety interior modules only.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA329V-8AI — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA329-16AI | ATMEGA329-16AU | ATMEGA329A-MUR | ATMEGA329P-20AU | ATMEGA329PA-AUR |
|---|---|---|---|---|---|---|
| Package | 64-TQFP (14x14 mm) | 64-TQFP (14x14 mm) - same | 64-TQFP (14x14 mm) - same | 64-QFN (9x9 mm) - different outline | 64-TQFP (14x14 mm) - same | 64-TQFP (14x14 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Maximum CPU Clock | 8 MHz | 16 MHz | 16 MHz | 20 MHz | 20 MHz | 20 MHz |
| Supply Voltage (Vcc) | 1.8 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 1.8 V to 5.5 V | 2.7 V to 5.5 V | 1.8 V to 5.5 V |
| Flash Memory | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB |
| SRAM | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB |
| On-chip LCD Controller | Yes (up to 4x25 segments) | Yes (up to 4x25 segments) | Yes (up to 4x25 segments) | Yes (up to 4x25 segments) | Yes (up to 4x25 segments) | Yes (up to 4x25 segments) |
| PicoPower / Low-Power Modes | Standard 6 power-saving modes | Standard 6 modes | Standard 6 modes | PicoPower | PicoPower | PicoPower |
Key Differentiators
- Low-voltage 1.8 V minimum Vcc operation (vs ATMEGA329-16AI)
- Mature on-chip LCD controller up to 4x25 segments (vs ATMEGA328P-PU)
- Same TQFP-64 footprint as newer picoPower variants (vs ATMEGA329PA-AUR)
Design Notes
The ATMEGA329V-8AI's six power-saving modes (Idle, ADC Noise Reduction, Power-save, Power-down, Standby, Extended Standby) let engineers tune quiescent current from a few mA down to <1 uA in Power-down mode. For battery metering, switch to Power-down between user interactions and use the watchdog timer or external interrupt on a button to wake. Estimated: at Vcc = 3.0 V and room temperature, Power-down current is approximately 0.5 uA per the Microchip ATmega329 datasheet typical values; verify in your own measurement.
Place a 100 nF decoupling capacitor on each pair of VCC/GND pins (digital supply pins) as close as possible to the package - the 64-TQFP has multiple VCC pins distributed along the die perimeter. Add a bulk 4.7 uF to 10 uF capacitor on the main 3.3 V rail near the MCU. For LCD applications, follow the bias-network reference layout in the datasheet's LCD section, including the LCDCAP capacitor and proper ground isolation between analog and digital sections.
Common pitfalls: (1) Confusing the V (1.8 V minimum) variant with the non-V (2.7 V minimum) variant - the V part will fail to start at 2.5 V; (2) Forgetting that Port C pin 6 is the RESET pin by default - to use it as a regular GPIO you must program the RSTDISBL fuse; (3) Using the internal RC oscillator in noisy environments without calibration - the 8 MHz default is factory-calibrated to within +/- 3% at 3 V; (4) Drawing too much current from a single GPIO (max 40 mA per pin, 200 mA per package) when driving LCD backlights directly - use a transistor.
Compliance Information
RoHS compliant per Microchip product page. Standard grade only - not AEC-Q100 qualified; use ATmega329 automotive-grade variant for automotive designs.
