ATMEGA3290A-AU - 8-bit AVR MCU 32KB Flash LCD | Microchip
Référence : ATMEGA3290A-AU ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $6.2 | $6,20 |
| 10 | $5.58 | $55,80 |
| 100 | $4.9 | $490,00 |
| 500 | $4.35 | $2 175,00 |
| 1 000 | $3.85 | $3 850,00 |
ATMEGA3290A-AU Présentation
An 8-bit AVR microcontroller is a Harvard-architecture RISC processor in the broader microcontroller (MCU) hierarchy: microcontroller -> embedded processor -> system-on-chip building block. AVR devices execute most of their 130 powerful instructions in a single clock cycle, and the ATmega family adds in-system programmable (ISP) Flash with read-while-write support, making field firmware updates straightforward without a separate programmer socket.
Key features of the ATMEGA3290A-AU include 69 general-purpose I/O lines, 32 general-purpose working registers, a JTAG interface for boundary-scan, on-chip debugging and programming, and a complete on-chip LCD controller with internal contrast control. The internal oscillator option reduces external component count, while three flexible timers (two 8-bit with separate prescaler and compare mode, one 16-bit) cover PWM, capture, and timing tasks.
Technically, the ATmega3290A belongs to the ATmega3290/3290P/6490 LCD megAVR family. The advanced RISC pipeline delivers close to 20 MIPS at 20 MHz, and the LCD driver directly drives segment glass for metering and human-machine interface panels, removing the need for an external LCD controller. EEPROM retention and ISP Flash endurance support data logging and frequent firmware updates in industrial products.
Typical applications include utility metering displays, industrial HMI panels with segmented LCDs, building automation keypads, and battery-powered instrumentation where the low-power AVR core and integrated LCD driver minimize board area and quiescent current.
When designing with this part, confirm the exact operating voltage range and LCD bias configuration against the manufacturer datasheet, and reserve JTAG header access for in-circuit debug. Note the distinction between the 'A' (standard) and 'P'/'PA' (picoPower) variants when sleep current is critical.
This page synthesizes distributor pricing, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet.
Alternatives de remplacement direct pour ATMEGA3290A-AU — 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 ATMEGA3290A-AU (même facteur de forme et même empreinte) — différant par Package, Number of I/O, Supply Voltage Range, Operating Temperature, RAM Size.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
ATMEGA3290P-AU
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
ATMEGA3290PA-AU
✅ Remplacement direct ⚠️ Spécifications non vérifiées✓ En stock
$4.48 / unité
Voir la fiche technique →ATMEGA6490A-AU
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ATMEGA6450A-AU
✅ Remplacement direct✓ En stock
$5.95 / unité
Voir la fiche technique →ATMEGA3250P-20AU
✅ Remplacement direct✓ En stock
$1.8 / unité
Voir la fiche technique →ATMEGA3250PA-AUR
✅ Remplacement direct✓ En stock
$2.98 / unité
Voir la fiche technique →ATMEGA3250V-8AUR
✅ Remplacement direct✓ En stock
$3.38 / unité
Voir la fiche technique →ATMEGA3290A-AU Valeurs maximales et caractéristiques électriques
| Core Processor | AVR |
| Core Size | 8-Bit |
| Speed | 20 MHz |
| Program Memory Size | 32KB (16K x 16) FLASH |
| RAM Size | 2K x 8 SRAM |
| EEPROM Size | 1KB |
| Number of I/O | 69 |
| Working Registers | 32 general purpose |
| Instructions | 130 powerful instructions, most single-cycle |
| LCD Controller | On-chip, up to 4 x 40 segments, internal contrast control |
| Timers | Two 8-bit with prescaler/compare, one 16-bit |
| Debug/Programming Interface | JTAG (boundary-scan, on-chip debug and programming) |
| Oscillator Type | Internal |
| Boîtier / Format | 100-TQFP (14x14 mm) |
| Température de fonctionnement | Industrial range |
| Type de montage | Surface Mount |
| Packaging | Tape & Reel (TR) |
Guide de configuration des broches du ATMEGA3290A-AU 100-tqfp (14x14 mm)
Configuration des broches du ATMEGA3290A-AU (boîtier 100-tqfp (14x14 mm)). Ce circuit intégré numérique comprend des GPIO, des interfaces de communication (UART, SPI, I2C) et des broches d'alimentation. Consultez la fiche technique du fabricant pour les fonctions alternatives des broches et les options de configuration. Indispensable pour la conception de systèmes embarqués et la conception de circuits imprimés.
Aucune donnée de brochage détaillée disponible pour ATMEGA3290A-AU.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
ATMEGA3290A-AU convient pour 6 applications: Utility Metering Displays, Industrial HMI Control Panels, Battery-Powered Portable Instruments, Building Automation Keypads and Thermostats, POS and Vending Machine Displays, Automotive and White-Goods Cluster Displays.
Utility Metering Displays
Electricity, water, and gas meters require a low-power MCU that can directly drive segmented LCD glass. The ATMEGA3290A-AU's on-chip LCD controller supports up to 4x40 = 160 segments with internal contrast control, so a 7-digit plus icon display is handled without an external LCD driver IC, cutting BOM cost and board area. The 1KB EEPROM stores calibration constants and billing data through power cycles, while the 20 MHz AVR core executes metering arithmetic between LCD refresh frames. Placed as the single main MCU with the LCD biased from internal contrast control, the design benefits from read-while-write Flash for field firmware updates and 69 GPIO lines for pulse inputs, tamper switches, and communication UARTs.
Recommandé
Industrial HMI Control Panels
Factory and building-automation control panels combine segmented LCDs, keypads, relays, and status LEDs - a load profile that matches the ATMEGA3290A-AU well. Its 69 general-purpose I/O lines natively cover a matrix keypad, backlight control, and relay drivers without port expanders, while the integrated 4x40 segment LCD controller with internal contrast control renders setpoints and alarms. Two 8-bit timers with separate prescaler and compare mode handle keypad debounce and PWM backlight dimming, and the 16-bit timer generates precise communication timing. JTAG on-chip debugging allows field service teams to reprogram the 32KB ISP Flash through a standard header, and 2KB SRAM buffers Modbus frames comfortably in typical panel firmware.
Recommandé
Battery-Powered Portable Instruments
Handheld measurement instruments need an MCU that sips current between measurements yet drives an informative display. The ATMEGA3290A-AU drives up to 160 LCD segments directly, and when sleep current is the overriding concern the pin-compatible ATMEGA3290P picoPower variant drops standby consumption dramatically with identical code compatibility. The internal oscillator option removes the crystal and its startup energy for cost- and power-sensitive designs. The 1KB EEPROM retains user calibration in the field, and the 20 MHz full-speed rating permits burst processing of ADC samples, then return to low-power idle. Designers should validate the exact voltage range and sleep figures against the datasheet for the selected variant.
Recommandé
Building Automation Keypads and Thermostats
Room controllers and programmable thermostats pair a segmented LCD with buttons and actuator outputs. The ATMEGA3290A-AU covers this exactly: the on-chip LCD controller shows temperature, setpoint, and schedule icons at 4x40 segment scale with internal contrast control across ambient conditions, while 69 I/O lines handle the button matrix, triac or relay drive, and damper motor feedback. Two 8-bit timers generate PWM outputs for actuator positioning, and the 16-bit timer timestamps occupancy events. The 32KB Flash accommodates schedules, PID loops, and communication stacks with read-while-write support allowing schedule storage in program Flash. JTAG programming simplifies OEM configuration at the assembly line.
Recommandé
POS and Vending Machine Displays
Vending machines, ticket terminals, and price displays need rugged segmented displays plus plentiful I/O for coin acceptors, motors, and sensors. The ATMEGA3290A-AU drives 160 LCD segments natively with internal contrast control that compensates for outdoor temperature swings, and its 69 GPIO lines directly manage mdb-style peripheral signaling, door switches, and motor H-bridge enables. The industrial temperature rating suits unheated kiosk enclosures, and the 1KB EEPROM logs transaction counters across power loss. Firmware stored in 32KB read-while-write Flash can be updated in service via JTAG. Where more program space is needed, the pin-compatible ATMEGA6490A doubles Flash without a PCB change.
Recommandé
Automotive and White-Goods Cluster Displays
Appliance control boards and basic vehicle cluster segments benefit from a single-chip solution that combines the LCD driver, timers, and EEPROM. The ATMEGA3290A-AU renders speed, temperature, and cycle-status segments through its 4x40 LCD controller, while timers drive buzzer tones and button backlight PWM. The 1KB EEPROM persists user cycle preferences, and the industrial temperature range supports under-hood-adjacent or kitchen environments. Engineers should evaluate the ATMEGA3290PA picoPower variant when standby current regulations (e.g., appliance off-mode limits) apply, since it is pin- and code-compatible. JTAG boundary-scan assists manufacturing test of the dense TQFP-100 solder joints on the cluster PCB.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ATMEGA3290A-AU — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | ATMEGA3290P-AU | ATMEGA6490A-AU | ATMEGA6450A-AU | ATMEGA3250V-8AUR |
|---|---|---|---|---|---|
| Package | 100-TQFP (14x14 mm) | 100-TQFP (14x14 mm) - same | 100-TQFP (14x14 mm) - same | 100-TQFP (14x14 mm) - same | 100-TQFP (14x14 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Flash | 32KB | 32KB | 64KB | 64KB | 32KB |
| LCD Controller | Yes, 4x40 segments | Yes, 4x40 segments | Yes | No | No |
| Low-Power Feature | Standard AVR sleep modes | picoPower | Standard | Standard | Low-voltage 1.8V operation |
| JTAG Debug | Yes | Yes | Yes | Yes | Yes |
Principaux différenciateurs
- Integrated 4x40 segment LCD controller with internal contrast control (vs ATMEGA6450A-AU)
- Standard power variant at lower cost than picoPower (vs ATMEGA3290P-AU)
- 20 MHz full-speed operation (vs ATMEGA3250V-8AUR)
Notes de conception
The 100-TQFP (14x14 mm) land pattern requires 0.5 mm pitch stencil design; use a 1:1 aperture with nano-coated stencils to avoid bridging on the fine-pitch perimeter. Route JTAG (TCK, TMS, TDI, TDO) to a 2x5 header near the MCU for production programming and debug, and keep LCD segment traces short and away from switching traces to prevent ghosting on the glass. Add 100 nF decoupling at each VCC/AVCC pin pair.
Decouple AVCC separately from VCC with an LC or RC filter (e.g., 10 uH ferrite plus 100 nF) since AVCC also supplies the ADC and LCD driver - ripple on AVCC appears as LCD contrast variation. If battery operation matters, evaluate the pin-compatible ATMEGA3290P/PA picoPower variants whose sleep current is orders of magnitude lower; they are code-compatible so the swap is a sourcing decision, not a redesign. Verify the exact operating voltage range in the datasheet for your speed grade.
Do not confuse the AU (tray) and AUR (Tape & Reel) suffixes when ordering for automated assembly - both are identical die but packaging differs. Remember JTAG can be fused off to free four port pins; if JTAG pins behave unexpectedly as GPIO, check fuse settings. The 'A' versus 'P' suffix is not cosmetic: sleep current differs substantially between ATMEGA3290A and ATMEGA3290P, so lock the correct variant in the BOM early.
Informations de conformité
Distributor listings (Mouser/FindIC) describe the part as GRN (Green) package, industrial temperature range. Formal RoHS/REACH certificates should be pulled from Microchip's product page for your build.
