ATMEGA3290V-8AU - 8MHz AVR MCU 32KB Flash LCD | Microchip
MPN: ATMEGA3290V-8AU β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.2 | $6.20 |
| 10 | $5.58 | $55.80 |
| 100 | $4.96 | $496.00 |
| 500 | $4.4 | $2,200.00 |
| 1,000 | $3.91 | $3,910.00 |
ATMEGA3290V-8AU Overview
An 8-bit AVR microcontroller is a Harvard-architecture RISC processor that executes most of its 131 instructions in a single clock cycle. In the system hierarchy, it sits within the power-management and human-interface layer of embedded designs, combining CPU, nonvolatile memory, SRAM, peripherals, and general-purpose I/O in one chip. The ATmega family from Microchip (formerly Atmel) is one of the most widely deployed 8-bit MCU platforms in industrial and consumer electronics.
Key features include the picoPower/AVR low-power CMOS core with multiple sleep modes, 69 general-purpose I/O lines, an integrated segment LCD driver, a 10-bit ADC, SPI, USART and two-wire (I2C) serial interfaces, and self-programming Flash with read-while-write support for in-system and boot-loader firmware updates. The V speed/voltage grade supports operation at up to 8 MHz across the extended voltage range, while the AU suffix denotes the industrial TQFP package.
Architecturally, the device provides 32 general-purpose working registers directly connected to the ALU, giving high code density and fast single-cycle register access. The on-chip ISP Flash permits field reprogramming, and JTAG-based debugging is available in family-compatible tools.
Typical applications include utility meters, thermostats and HVAC controllers, battery-powered instruments with segment LCDs, and industrial control panels where an LCD driver plus ADC in one MCU saves board space and BOM cost.
Design consideration: keep the system clock at or below 8 MHz as the V grade dictates, and verify brown-out and sleep-mode settings early because picoPower devices behave differently from P variants in deep-sleep current.
This page synthesizes distributor pricing, drop-in alternatives, design notes, and FAQ content not found together on the manufacturer datasheet.
Drop-in alternatives for ATMEGA3290V-8AU β 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 ATMEGA3290V-8AU (same form factor and footprint) β differing in Package, Supply Voltage Range, Core Architecture, Operating Temperature, RoHS Status.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATMEGA3290PA-AU
β Drop-Inβ In Stock
$4.48 / Unit
View Datasheet βATMEGA3290P-20AUR
β Drop-Inβ In Stock
Contact for price
View Datasheet βATMEGA3290-16AU
β Drop-Inπ Reference alternative (not in catalog)
ATMEGA3290-16AI
β Drop-Inβ In Stock
$4.14 / Unit
View Datasheet βATMEGA3250PA-AUR
β Drop-Inβ In Stock
$2.98 / Unit
View Datasheet βATMEGA3250P-20AU
β Drop-Inβ In Stock
$1.8 / Unit
View Datasheet βATMEGA3250-16AU
β Drop-Inβ In Stock
$5.74 / Unit
View Datasheet βATMEGA3290V-8AU Maximum Ratings & Electrical Characteristics
| Core | AVR 8-bit RISC |
| Core Size | 8-bit |
| Speed | 8 MHz |
| Program Memory Type | FLASH |
| Program Memory Size | 32 KB (16K x 16) |
| EEPROM Size | 1 KB |
| RAM Size | 2 KB |
| Number of I/O | 69 |
| I/O Ports | 32 |
| Instructions | 131 (most single-cycle) |
| Peripherals | LCD controller, Brown-out Detect/Reset, POR, PWM, WDT |
| ADC Resolution | 10-bit |
| Connectivity | SPI, UART/USART, TWI (I2C) |
| Package | 100-TQFP (14 x 14 mm), 0.8 mm pitch |
| Mounting Type | Surface Mount |
| Supply Voltage Range | 1.8 V to 5.5 V (V grade) |
| Operating Temperature | -40C to +85C (AU industrial grade) |
| Lifecycle Status | ACTIVE |
| Oscillator Type | Internal + External |
ATMEGA3290V-8AU 100-tqfp (14 x 14 mm), 0.8 mm pitch Pin Configuration Guide
Pin configuration for ATMEGA3290V-8AU (100-tqfp (14 x 14 mm), 0.8 mm pitch 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 ATMEGA3290V-8AU.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA3290V-8AU is suitable for 6 applications: Utility Metering (Electricity/Water/Gas Meters), Thermostats and HVAC Controllers, Battery-Powered Portable Instruments, Industrial Control Panels and HMI, Data Loggers and Remote Monitoring Nodes, Consumer Appliances with Segment Displays.
Utility Metering (Electricity/Water/Gas Meters)
The ATMEGA3290V-8AU fits utility metering because it combines a segment LCD controller, a 10-bit ADC and 69 GPIO lines in one 100-TQFP device, eliminating a separate LCD driver and reducing BOM cost. The 8 MHz V-grade AVR core handles metering accumulation, tariff logic and communication framing with ample margin, while the 32 KB self-programming Flash supports field firmware updates and the 1 KB EEPROM preserves calibration and billing data across power cycles. Implemented as the main MCU driving the LCD and sampling the front-end with the ADC, it offers quantified integration gains: one chip replaces an MCU plus LCD controller pair, and sleep modes cut average current in battery- or shunt-powered meters. The trade-off is that high-rate DSP should be avoided at 8 MHz.
Recommended
Thermostats and HVAC Controllers
HVAC thermostats and zone controllers benefit from the ATMEGA3290V-8AU because its integrated LCD driver renders setpoint and status on segment displays, its 10-bit ADC reads NTC temperature sensors and potentiometers, and the USART or TWI (I2C) interfaces link to relays or remote sensors. Running at up to 8 MHz from a wide voltage supply, the AVR core executes the 131-instruction RISC set mostly in single cycles, keeping control-loop latency predictable. The device operates across the industrial -40C to +85C temperature range of the AU package grade, which matches mechanical-room and rooftop-unit environments. With sleep modes and brown-out reset, the design remains robust through brownouts and battery backup transitions; for new low-power designs, the pin-compatible picoPower ATMEGA3290PA-AU lowers standby current further.
Recommended
Battery-Powered Portable Instruments
Portable instruments with segment LCDs are a natural fit for the ATMEGA3290V-8AU: the on-chip LCD controller and 10-bit ADC mean the signal chain and display share one MCU, shrinking PCB area in handheld enclosures. The 32 KB Flash with read-while-write supports boot-loader-based field updates, and the 1 KB EEPROM stores user calibration. The V grade permits operation at low supply voltages with an 8 MHz ceiling, aligning with single-cell or Li-ion rail topologies. Because the display update and measurement loops are interrupt-driven, the core can spend most time in power-down sleep between samples; design teams seeking minimum sleep current should layout-identically adopt the picoPower ATMEGA3290PA-AU, which drops into the same 100-TQFP footprint with no PCB changes.
Recommended
Industrial Control Panels and HMI
In industrial control panels, the ATMEGA3290V-8AU serves as a compact human-machine-interface controller: 69 GPIO lines drive buttons, LEDs and relays while the segment LCD shows status, and the SPI/USART/TWI set links to serial peripherals or backplanes. The industrial AU temperature grade (-40C to +85C), brown-out detector, watchdog timer and power-on reset give the fault tolerance panels require, and single-cycle RISC execution keeps scan times deterministic at 8 MHz. Self-programming Flash enables on-panel firmware service without desoldering. For designs needing more compute or additional UARTs, Microchip's larger ATmega2560V-8AU complements rather than replaces the 3290, handling protocol gateway duties while the 3290 manages the LCD front panel.
Recommended
Data Loggers and Remote Monitoring Nodes
The ATMEGA3290V-8AU works well in data loggers: its 10-bit ADC digitizes sensor channels, the EEPROM retains configuration across resets, and the USART/TWI interfaces connect to SD-card, radio or RS-485 modules, while the LCD shows sample count and fault codes in the field. The 8 MHz AVR core provides enough throughput for time-stamped sampling loops, and sleep modes between acquisitions reduce average draw in solar- or battery-powered nodes. The 32 KB self-programming Flash lets the logger store and update firmware in situ - valuable for units mounted in inaccessible locations. Designers should budget the 2 KB SRAM carefully against buffering needs; where larger buffers are required, the same-footprint strategy is to move gateway processing to an ATMEGA2560-class part.
Recommended
Consumer Appliances with Segment Displays
White goods and small appliances that show time, mode and error codes on segment LCDs are well served by the ATMEGA3290V-8AU. The integrated LCD driver and 69 GPIO lines handle the display plus keypad matrix without external logic, the 10-bit ADC reads temperature probes and user potentiometers, and the wide-supply V grade tolerates mains-derived supply droop. The AVR's watchdog timer and brown-out reset keep firmware execution safe in electrically noisy kitchen environments, and 32 KB Flash accommodates sizable state machines and localized strings. Cost is contained because no separate display controller is needed. For cost-reduced follow-on models, the pin-compatible ATMEGA3250 family members (e.g., ATMEGA3250PA-AUR) offer the same package with a slightly different peripheral mix.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA3290V-8AU β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA3290PA-AU | ATMEGA3290P-20AUR | ATMEGA3250PA-AUR | ATMEGA3250-16AU |
|---|---|---|---|---|---|
| Package | 100-TQFP (14 x 14 mm) | 100-TQFP (14 x 14 mm) - same | 100-TQFP (14 x 14 mm) - same | 100-TQFP (14 x 14 mm) - same | 100-TQFP (14 x 14 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash | 32 KB (16K x 16) | 32 KB | 32 KB | 32 KB | 32 KB |
| LCD Controller | Yes (integrated) | Yes | Yes | Yes | Yes |
| Low Power Technology | Standard AVR (V grade) | picoPower | picoPower | picoPower | Standard AVR |
| Lifecycle Status | ACTIVE | ACTIVE | ACTIVE | ACTIVE | ACTIVE |
Key Differentiators
- Lowest-cost legacy silicon for existing V-grade boards (vs ATMEGA3290PA-AU)
- Integrated segment LCD controller (vs ATMEGA2560V-8AU)
- Speed headroom on same footprint (vs ATMEGA3290P-20AUR)
- Battery-life upgrade path with zero layout change (vs ATMEGA3290PA-AU)
Design Notes
Respect the V speed grade: the ATMEGA3290V-8AU is rated to 8 MHz, not the 16-20 MHz of P variants. Clocking above the frequency allowed at the applied VCC produces unstable execution. When migrating to ATMEGA3290P-20AU or PA parts, check speed-versus-voltage curves and fuse (CKDIV8, CKOUT) settings, and note that picoPower devices exhibit different sleep and BOD behavior - re-verify sleep currents and brown-out thresholds in the PA datasheet before reusing legacy fuse configurations.
The 100-TQFP 14 x 14 mm body with 0.8 mm pitch requires a compliant IPC-style land pattern; verify the mechanical drawing in the Microchip datasheet before release. Place 100 nF decoupling capacitors at each VCC/AVCC pin pair as close to the package as possible, with one bulk 10 uF per rail. Route the LCD segment lines away from the ADC input traces and crystal, since LCD drive waveforms are AC-multiplexed and can couple into high-impedance analog nodes. Keep the crystal within a few millimeters of XTAL1/XTAL2 with short guard ground.
Estimated: an ATmega drawing roughly 10 mA active at 5 V dissipates about 50 mW - no heatsinking concerns - but battery-life design depends on sleep-mode selection. Use power-down sleep between measurement/display update cycles and gate unused peripheral clocks via PRR. On V-grade silicon at low VCC, reduce the system clock accordingly; for lowest sleep current in a respin, the pin-compatible picoPower ATMEGA3290PA-AU on the identical 100-TQFP footprint is the recommended substitution.
Provide a 6-pin ISP header and JTAG access on the PCB for in-system programming and debug; self-programming Flash with read-while-write allows boot-loader updates, but only if the boot section fuses are configured and the ISP traces are short. Avoid loading the JTAG pins (shared with port C) with heavy external circuitry if boundary scan or on-chip debug will be used. If the JTAG interface is disabled via fuse, those pins revert to GPIO - document fuse state in production test plans.
Compliance Information
Verified web data did not include explicit RoHS/REACH/lead-free statements for this ordering code. Modern Microchip ATmega parts in AU packages are generally RoHS-compliant, but confirm on the Microchip product page before citing compliance.
