ATMEGA649-16MUR - 8-bit AVR MCU 64KB 16MHz LCD | Microchip
Teilenummer: ATMEGA649-16MUR ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $10.71 | $10,71 |
| 10 | $9.85 | $98,50 |
| 100 | $8.95 | $895,00 |
| 500 | $8.25 | $4.125,00 |
| 1.000 | $7.6 | $7.600,00 |
ATMEGA649-16MUR Übersicht
An 8-bit AVR microcontroller is a single-chip processor built on the AVR enhanced RISC architecture, in which most of the 130 powerful instructions execute in a single clock cycle. Within the system hierarchy, the MCU sits at the heart of embedded control: microcontroller -> embedded processor -> semiconductor IC. The ATmega649 belongs to the LCD AVR family (ATmega325/329/645/649 and the 3290/6490 variants), which pairs general-purpose MCU peripherals with an on-chip LCD controller that can drive a segmented glass display directly.
Key features include 64KB of self-programming Flash with read-while-write capability, 54 general-purpose I/O lines, a JTAG interface for boundary-scan, on-chip debugging, and programming, and an LCD controller with up to 4x25 or 8x24 segment drive. The advanced RISC core with 32 general-purpose working registers is directly connected to the ALU, allowing two independent registers to be accessed in one instruction.
Technically, the device executes up to 16 MIPS at 16MHz, supports in-system self-programming via the boot loader section, and offers power-saving modes including idle, ADC noise reduction, and power-down, making it suited to battery-operated metering products. Peripherals include 8-channel 10-bit ADC, two 8-bit and two 16-bit timers with PWM, USART, SPI, and two-wire interface (per the ATmega649 family datasheet).
Typical applications are utility metering with LCD display, handheld instruments, industrial control panels, and consumer appliances where a segmented display and low power are required.
When designing with this part, budget the Flash around the bootloader size and validate the LCD bias resistor network against the target glass.
This page synthesizes distributor pricing, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in-Alternativen für ATMEGA649-16MUR – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit ATMEGA649-16MUR (gleiche Bauform und Footprint) – abweichend in Package, Instructions, ADC Resolution, EEPROM Size, EEPROM.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
ATMEGA649A-16MUR
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
ATMEGA645-16MUR
✅ Drop-In ⚠️ Spezifikationen ungeprüft✓ Auf Lager
$3.35 / Stück
Datenblatt ansehen →ATMEGA649-16MI
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
ATMEGA329-16MUR
✅ Drop-In ⚠️ Spezifikationen ungeprüft✓ Auf Lager
$3.95 / Stück
Datenblatt ansehen →ATMEGA325-16MUR
✅ Drop-In ⚠️ Spezifikationen ungeprüft✓ Auf Lager
$3.28 / Stück
Datenblatt ansehen →ATMEGA649-16MUR Grenzwerte & elektrische Eigenschaften
| Core Architecture | 8-bit AVR RISC |
| Core Size | 8-bit |
| Speed | 16 MHz |
| Flash Memory | 64 KB (32K x 16) |
| EEPROM | 2 KB |
| SRAM | 4 KB |
| GPIO | 54 / 69 general purpose I/O lines |
| Working Registers | 32 general purpose |
| Instructions | 130 powerful instructions, most single-cycle |
| LCD Driver | Yes (segment LCD) |
| JTAG Interface | Yes (boundary-scan, on-chip debug, programming) |
| Versorgungsspannung | 5 V (16 MHz operation) |
| Gehäuse | 64-QFN (9x9 mm), VFQFN exposed pad |
| Montageart | Surface Mount |
| Programming | ISP (in-system, self-programming Flash) |
| RoHS-Status | GREEN (per distributor listing) |
ATMEGA649-16MUR 64-qfn (9x9 mm), vfqfn exposed pad Pinbelegungsleitfaden
Pinbelegung für ATMEGA649-16MUR (64-qfn (9x9 mm), vfqfn exposed pad-Gehäuse). Dieser digitale IC umfasst GPIO, Kommunikationsschnittstellen (UART, SPI, I2C) und Versorgungspins. Alternative Pin-Funktionen und Konfigurationsoptionen entnehmen Sie dem Herstellerdatenblatt. Unverzichtbar für Embedded-System-Design und PCB-Layout.
Keine detaillierten Pinbelegungsdaten verfügbar für ATMEGA649-16MUR.
Siehe die Datenblatt für die vollständige Pin-Konfiguration.
Typische Anwendungen
ATMEGA649-16MUR ist geeignet für 6 Anwendungs: Utility Metering with LCD Display, Handheld Test and Measurement Instruments, Industrial Control Panels and HMI, Consumer Appliances, Battery-Powered Data Loggers, Access Control and Security Panels.
Utility Metering with LCD Display
The ATMEGA649-16MUR fits utility metering (electricity, water, heat) because it combines a 64KB self-programming Flash for metering firmware plus logging, 4KB SRAM for data buffers, and an on-chip segment LCD driver that interfaces directly to the meter glass without an external LCD controller. The power-down mode permits long battery-backed operation between measurements, while the 10-bit ADC and timers support pulse counting and analog sensing. Placed on a two-layer or four-layer board with the LCD on the same flex or PCB, the MCU drives up to dozens of segments; the read-while-write Flash enables field firmware updates over the meter communication bus without stopping the LCD display.
Empfohlen
Handheld Test and Measurement Instruments
Handheld multimeters, Environmental meters, and diagnostic tools benefit from the ATMEGA649-16MUR's 16MHz AVR core (up to 16 MIPS) for fast ADC post-processing, its 8-channel 10-bit ADC for multi-sensor input, and the segment LCD for readouts. The 64KB Flash holds calibration tables, multiple measurement modes, and a USB or UART bootloader implemented with the read-while-write capability. JTAG on-chip debugging shortens development cycles on the small 64-QFN board. Running from batteries, developers exploit the ADC noise reduction mode during sampling and power-down between user interactions, trading the 5V/16MHz speed grade against lower clock settings to extend battery life while keeping responsive display updates.
Empfohlen
Industrial Control Panels and HMI
For panel-mounted controllers with segmented status displays, the ATMEGA649-16MUR provides 54 GPIO lines for relays, buttons, and LED indicators alongside the integrated LCD driver, consolidating display and I/O control in one 64-QFN chip. The 64KB Flash accommodates state machines, Modus or custom serial protocols over the USART, and parameter storage in the 2KB EEPROM. The SPI and two-wire interface connect expansion peripherals such as ADCs, RTCs, or external memory. Industrial noise immunity is supported by the AVR's wide supply operation at 5V and watchdog supervision; JTAG boundary-scan aids production test of the densely populated panel board, and the exposed QFN pad improves ground integrity.
Empfohlen
Consumer Appliances
White goods, climate controls, and small appliances use the ATMEGA649-16MUR where a segmented LCD, touch or mechanical buttons, and actuator control converge. The 16MHz performance handles temperature-control loops and user interface debouncing simultaneously, while 4KB SRAM supports buffering for sensor filtering and display refresh. The EEPROM retains user settings and fault logs across power cycles. Compliance-oriented designs benefit from the GREEN/RoHS-friendly construction documented in distributor listings. Firmware in the 64KB Flash can include an OTA-capable bootloader using self-programming, allowing service updates via the appliance's existing communication link; the power-down mode supports standby-current targets demanded by modern energy regulations for always-on appliances.
Empfohlen
Battery-Powered Data Loggers
Data loggers for temperature, humidity, or pressure chains exploit the ATMEGA649-16MUR's sleep architecture: the core idles in power-down between timed wake-ups driven by timer or watchdog, samples via the 10-bit ADC, writes records to internal EEPROM or external SPI Flash, and updates the LCD only on user request. The 64KB Flash holds long logging tables and formatting code, and read-while-write lets the boot region service firmware updates without corrupting logged data. Because the LCD driver is on-chip, no display controller current is wasted; estimates should be validated with the datasheet current-consumption tables at the chosen clock and voltage for accurate battery sizing.
Empfohlen
Access Control and Security Panels
Keypad-based access controllers use the ATMEGA649-16MUR's generous GPIO (54 lines) for matrix keypads, locks, and zone inputs, with the segment LCD showing status and user prompts. The 64KB Flash supports code tables, multiple credential formats, and encrypted communication routines over the USART or SPI; the 2KB EEPROM stores user records that must survive power loss. The JTAG interface supports both boundary-scan production testing and secure on-chip debug during development, and the self-programming boot section enables credential-database firmware updates in the field. Watchdog and brown-out supervision (per family datasheet features) protect against tampering via power glitching on the 5V rail.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für ATMEGA649-16MUR – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | ATMEGA649A-16MUR | ATMEGA645-16MUR | ATMEGA329-16MUR | ATMEGA325-16MUR |
|---|---|---|---|---|---|
| Package | 64-QFN (9x9 mm) exposed pad | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 64 KB | 64 KB | 64 KB | 32 KB | 32 KB |
| SRAM | 4 KB | 4 KB | 4 KB | 2 KB | 2 KB |
| EEPROM | 2 KB | 2 KB | 2 KB | 1 KB | 1 KB |
| Max Speed | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 16 MHz |
| LCD Driver | Yes | Yes | Yes | Yes | Yes |
| Lifecycle | Active (superseded by 649A revision) | Active (newer revision) | Active | Active | Active |
Wichtigste Unterscheidungsmerkmale
- Largest Flash in its pin-compatible LCD group (vs. ATMEGA329-16MUR)
- Direct firmware-compatible upgrade path (vs. ATMEGA649A-16MUR)
- Trade-off: original revision silicon (vs. ATMEGA649A-16MUR)
Designhinweise
The 64-QFN (9x9 mm) exposed-pad package requires a well-defined thermal land pattern under the center pad for grounding. Connect the exposed pad to a solid ground plane with an array of thermal vias; on the LCD AVR this ground return also affects LCD segment contrast and ADC noise. Follow Microchip's QFN land-pattern application guidance for stencil design - typically a cross-hatch or window-pane pattern on the center pad avoids excessive solder and floating during reflow.
The -16MUR ordering code targets 16MHz operation from a 5V supply; running the part outside the voltage/frequency envelope specified in the family datasheet causes marginal timing and unreliable Flash writes. Decouple VCC and AVCC separately with 100nF ceramics placed within 5mm of the pins, and use the ADC noise reduction sleep mode plus AGND star routing when sampling with the 10-bit ADC. If battery operation demands lower voltage, evaluate the -V speed grades in the same family instead of under-clocking this speed grade.
Because the ATMEGA649 is superseded by the ATMEGA649A, read the errata and migration notes in the newer datasheet before freezing a design on the older revision; several early-silicon issues are corrected only in the A-version. Also budget Flash for the bootloader section: self-programming with read-while-write requires reserving a boot block, and EEPROM writes must respect the datasheet write-cycle timing or data corruption can occur during brown-out - always enable brown-out detection.
Keep the LCD segment and COM lines away from the crystal and JTAG routing; LCD drive waveforms are AC-biased square waves that capacitively couple into high-impedance analog nodes. Route JTAG (TCK, TMS, TDI, TDO) as short, direct traces with a grounded keep-out because TCK edges can radiate into nearby ADC inputs. Add a pull-up on RESET only per datasheet recommendations, since the internal pull-up suffices in many designs and external RC delay affects ISP timing.
Compliance-Informationen
Listed as GREEN (RoHS-friendly, lead-free) in distributor listings (FindIC: 'QFN/MLF, IND TEMP, GREEN, 5V'). Not an automotive-qualified ordering code. Formal REACH/conflict-minerals declarations should be requested from Microchip.
