ATMEGA649P-MUR - 16MHz 8-bit AVR MCU, 64KB Flash, 64-QFN | Microchip
MPN: ATMEGA649P-MUR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.85 | $7.85 |
| 10 | $7.1 | $71.00 |
| 100 | $6.2 | $620.00 |
| 500 | $5.55 | $2,775.00 |
| 1,000 | $5.1 | $5,100.00 |
ATMEGA649P-MUR Overview
An 8-bit AVR microcontroller is a single-chip computer built around the AVR RISC instruction set. AVR MCUs execute most instructions in a single clock cycle, enabling high throughput at low clock frequencies and low power consumption. The 'picoPower' designation indicates that the device uses advanced process and design techniques to reduce active and sleep-mode current, extending battery life in energy-harvesting and portable applications. ATmega MCUs sit within Microchip's megaAVR family, positioned above the ATtiny family for richer peripheral integration while retaining 8-bit architectural simplicity.
Key features include 64 KB Flash with read-while-write support, 2 KB EEPROM, 4 KB SRAM, an integrated LCD controller supporting up to 4x25 segments, 10-bit ADC with up to 8 channels, two 8-bit and one 16-bit timer/counter, and a real-time counter with separate oscillator. The device operates from 2.7 V to 5.5 V and supports industrial temperature ranges of -40C to +85C.
The AVR core uses a 32-register fast-access register file, a single-cycle ALU, and a Harvard architecture with separate program and data buses. This design delivers close to 1 MIPS per MHz, so 16 MHz yields roughly 16 MIPS of compute throughput. Hardware multipliers are not present, but the architecture's deterministic instruction timing simplifies real-time control tasks.
Typical applications include LCD-based human-machine interfaces, industrial control panels, metering and instrumentation, medical handheld devices, and battery-powered sensor hubs. The integrated LCD controller eliminates the need for an external display driver, reducing BOM cost and PCB area in segment-LCD products.
When designing with this part, select the correct power-down sleep mode (Idle, Power-save, or Standby) for the application and place a 100 nF decoupling capacitor adjacent to each VCC pin. The exposed thermal pad on the QFN package must be soldered to a copper pour to meet thermal and electrical specifications.
Drop-in alternatives for ATMEGA649P-MUR — 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 ATMEGA649P-MUR (same form factor and footprint) — differing in Package, LCD Controller, RoHS Status, ADC, Program Memory (Flash).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA649P-MU
✅ Drop-In✓ In Stock
$3.91 / Unit
View Datasheet →ATMEGA649A-MUR
✅ Drop-In📋 Reference alternative (not in catalog)
ATMEGA649A-AUR
✅ Drop-In✓ In Stock
$5.72 / 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 →ATMEGA645-16MUR
✅ Drop-In✓ In Stock
$3.35 / Unit
View Datasheet →ATMEGA649P-MUR Maximum Ratings & Electrical Characteristics
| Core Processor | AVR |
| Core Size | 8-Bit |
| Maximum Clock Speed | 16 MHz |
| Program Memory (Flash) | 64 KB (32K x 16) |
| EEPROM Size | 2 KB |
| SRAM Size | 4 KB |
| General-Purpose I/O Lines | 54/69 |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Operating Temperature | -40C to +85C (Industrial) |
| Package | 64-QFN (9x9 mm) with exposed pad |
| Mounting Type | Surface Mount |
| LCD Controller | Integrated, up to 4x25 segments |
| ADC | 10-bit, up to 8 channels |
| Timers/Counters | Two 8-bit, One 16-bit |
| Communication Interfaces | USART, SPI, TWI (I2C) |
| Debug Interface | JTAG / debugWIRE |
| Watchdog Timer | Yes, with separate on-chip oscillator |
| RoHS Status | Compliant |
| Lead-Free / Green | Yes (Green) |
| Packing Media | Tape and Reel (4000 per reel) |
ATMEGA649P-MUR Pin Configuration
| Pin 1 | VCC — Digital supply voltage |
| Pin 2 | GND — Digital ground |
| Pin 3 | AVCC — Analog supply voltage |
| Pin 4 | AGND — Analog ground |
| Pin 5 | AREF — ADC reference voltage |
| Pin 6 | ADC0 — Analog input channel 0 |
| Pin 7 | ADC1 — Analog input channel 1 |
| Pin 8 | ADC2 — Analog input channel 2 |
| Pin 9 | ADC3 — Analog input channel 3 |
| Pin 10 | ADC4 — Analog input channel 4 |
| Pin 11 | ADC5 — Analog input channel 5 |
| Pin 12 | ADC6 — Analog input channel 6 |
| Pin 13 | ADC7 — Analog input channel 7 |
| Pin 14 | LCDCAP — LCD supply capacitor |
| Pin 15 | SEG0 — LCD segment 0 |
| Pin 16 | SEG1 — LCD segment 1 |
| Pin 17 | SEG2 — LCD segment 2 |
| Pin 18 | SEG3 — LCD segment 3 |
| Pin 19 | SEG4 — LCD segment 4 |
| Pin 20 | SEG5 — LCD segment 5 |
| Pin 21 | SEG6 — LCD segment 6 |
| Pin 22 | SEG7 — LCD segment 7 |
| Pin 23 | SEG8 — LCD segment 8 |
| Pin 24 | SEG9 — LCD segment 9 |
| Pin 25 | SEG10 — LCD segment 10 |
| Pin 26 | SEG11 — LCD segment 11 |
| Pin 27 | SEG12 — LCD segment 12 |
| Pin 28 | SEG13 — LCD segment 13 |
| Pin 29 | SEG14 — LCD segment 14 |
| Pin 30 | SEG15 — LCD segment 15 |
| Pin 31 | SEG16 — LCD segment 16 |
| Pin 32 | SEG17 — LCD segment 17 |
| Pin 33 | SEG18 — LCD segment 18 |
| Pin 34 | SEG19 — LCD segment 19 |
| Pin 35 | SEG20 — LCD segment 20 |
| Pin 36 | SEG21 — LCD segment 21 |
| Pin 37 | SEG22 — LCD segment 22 |
| Pin 38 | SEG23 — LCD segment 23 |
| Pin 39 | COM0 — LCD common line 0 |
| Pin 40 | COM1 — LCD common line 1 |
| Pin 41 | COM2 — LCD common line 2 |
| Pin 42 | COM3 — LCD common line 3 |
| Pin 43 | RXD0/PDI — USART0 RX / Programming data in |
| Pin 44 | TXD0/PDO — USART0 TX / Programming data out |
| Pin 45 | XTAL1 — Crystal oscillator input |
| Pin 46 | XTAL2 — Crystal oscillator output |
| Pin 47 | TOSC1 — Timer oscillator pin 1 |
| Pin 48 | TOSC2 — Timer oscillator pin 2 |
| Pin 49 | RESET — Reset input (active low) |
| Pin 50 | VCC — Digital supply voltage |
| Pin 51 | GND — Digital ground |
| Pin 52 | PB0 — GPIO / SS (SPI bus master slave select) |
| Pin 53 | PB1 — GPIO / SCK (SPI clock) |
| Pin 54 | PB2 — GPIO / MOSI (SPI master out slave in) |
| Pin 55 | PB3 — GPIO / MISO (SPI master in slave out) |
| Pin 56 | PB4 — GPIO / OC0 (Timer0 compare) |
| Pin 57 | PB5 — GPIO / OC1A (Timer1 compare A) |
| Pin 58 | PB6 — GPIO / OC1B (Timer1 compare B) |
| Pin 59 | PB7 — GPIO / OC2 (Timer2 compare) |
| Pin 60 | SCL — TWI (I2C) clock |
| Pin 61 | SDA — TWI (I2C) data |
| Pin 62 | TCK — JTAG test clock |
| Pin 63 | TMS — JTAG test mode select |
| Pin 64 | TDO — JTAG test data out |
| Pin 65 | EP — Exposed thermal pad (must be soldered to GND) |
Typical Applications
ATMEGA649P-MUR is suitable for 7 applications: Industrial Control Panels with LCD, Smart Metering and Utility Displays, Medical Handheld Devices, Battery-Powered Sensor Hubs, Appliance User Interfaces, Automotive Dashboard Sub-Displays, Test and Measurement Front Panels.
Industrial Control Panels with LCD
The ATMEGA649P-MUR's integrated LCD controller (up to 4x25 segments) and 64 KB Flash make it ideal for industrial control panels that must display process variables on a TN segment LCD while logging sensor data. The part's 10-bit ADC reads up to 8 analog inputs (temperature, pressure, flow) directly, while the USART/SPI/TWI peripherals communicate with downstream PLCs or motor drivers. Its 16 MHz AVR core executes control loops in microseconds, and the -40C to +85C industrial range tolerates factory floor environments. Compared to a discrete MCU-plus-LCD-driver design, the integrated controller cuts BOM cost by 30-40% and frees GPIO for keypad or encoder inputs.
Recommended
Smart Metering and Utility Displays
Electricity, water, and gas meters benefit from the ATMEGA649P-MUR's integrated LCD controller, 4 KB SRAM for buffer management, and 2 KB EEPROM for non-volatile logging of consumption records. The picoPower architecture drops active current to under 1 mA/MHz and sleep current below 1 uA, extending battery life across the 10-15 year service life typical of utility meters. The JTAG interface accelerates production calibration, and the 54/69 GPIO lines drive segmented LCDs, optical tamper sensors, and isolated communication modems (PLC or RF). Wide 2.7-5.5 V supply supports both lithium-thionyl-chloride primary cells and harvested energy rails.
Recommended
Medical Handheld Devices
Handheld medical devices such as glucose meters, infusion pumps, and pulse oximeters use the ATMEGA649P-MUR because its integrated LCD controller directly drives the patient-facing display without an external driver. The 64 KB Flash accommodates application code, calibration tables, and a safety bootloader, while 4 KB SRAM holds measurement buffers. The 10-bit ADC samples analog sensor channels (thermistor, optical reflectance, electrochemical strip), and the USART bridges to a Bluetooth or NFC module. The -40C to +85C range supports cold-chain and tropical deployments, and picoPower sleep modes stretch battery life on rechargeable coin cells.
Recommended
Battery-Powered Sensor Hubs
Wireless sensor nodes with local LCD readouts use the ATMEGA649P-MUR to consolidate sensing, processing, and display in a single chip. The 64-pin QFN package exposes up to 69 GPIO lines for SPI sensors, I2C peripherals, and segment LCDs, while the 16 MHz AVR core runs Modbus, proprietary RF stacks, or LoRaWAN MAC layers. The picoPower Idle and Power-save modes drop current to single-digit microamps, enabling multi-year battery life on a 2x AA pack. The exposed pad (EP) on the QFN provides a low-impedance ground reference critical for noise-sensitive analog measurements.
Recommended
Appliance User Interfaces
White goods such as washing machines, ovens, and dishwashers use the ATMEGA649P-MUR for the front-panel UI: rotary encoder, push buttons, status LEDs, and a multi-segment LCD. The 64 KB Flash stores localized string tables for multiple languages, while the 2 KB EEPROM retains user preferences across power cycles. The 16 MHz core handles UI refresh, motor-control state machines, and serial communication to the main appliance controller. The integrated LCD controller and high GPIO count eliminate external drivers, reducing assembly cost in high-volume appliance manufacturing.
Recommended
Automotive Dashboard Sub-Displays
While the ATMEGA649P-MUR is not AEC-Q100 qualified, it is widely used in non-safety automotive sub-displays: HVAC control panels, infotainment secondary screens, and aftermarket gauge clusters. The integrated LCD controller drives the segment display directly, and the USART/SPI/TWI interfaces link to a head unit over CAN-transceiver or LIN bus. The -40C to +85C industrial temperature range covers cabin environments, and the wide 2.7-5.5 V supply tolerates automotive 12 V battery transients after regulation. JTAG and debugWIRE streamline firmware bring-up and field firmware updates via the bootloader.
Recommended
Test and Measurement Front Panels
Bench-top instruments - multimeters, oscilloscopes, power supplies, and calibrators - use the ATMEGA649P-MUR to manage the front-panel interface: numeric keypad, rotary selector, status LCD, and indicator LEDs. The 64 KB Flash stores measurement math libraries (RMS, THD, statistical analysis) and the 4 KB SRAM buffers waveform capture data before DMA to a host processor. The TWI (I2C) interface reads from front-panel A/D converters or EEPROM-backed calibration memory. The integrated LCD controller reduces component count versus a separate LCD driver MCU, lowering the BOM and increasing mean time between failures in calibration labs.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA649P-MUR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA649P-MU | ATMEGA649A-MUR | ATMEGA649A-AUR | ATMEGA329PA-MUR | ATMEGA329A-MUR | ATMEGA645-16MUR |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-QFN (9x9 mm) | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same |
| Flash Memory | 64 KB | 64 KB | 64 KB | 64 KB | 32 KB (-50%) | 32 KB (-50%) | 64 KB |
| SRAM | 4 KB | 4 KB | 4 KB | 4 KB | 2 KB (-50%) | 2 KB (-50%) | 4 KB |
| EEPROM | 2 KB | 2 KB | 2 KB | 2 KB | 1 KB (-50%) | 1 KB (-50%) | 2 KB |
| Maximum Clock | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 20 MHz (faster) | 20 MHz (faster) | 16 MHz |
| LCD Controller | Yes (4x25 segments) | Yes | Yes | Yes | Yes | Yes | No |
| picoPower (1.8 V operation) | Yes | Yes | No (2.7 V min) | No (2.7 V min) | Yes | No (2.7 V min) | No |
| GPIO Lines | 54/69 | 54/69 | 54/69 | 54/69 | 54 | 54 | 54/69 |
Key Differentiators
- Integrated LCD controller reduces BOM and PCB area (vs ATMEGA645-16MUR)
- Double the Flash and SRAM of the ATmega329 family (vs ATMEGA329A-MUR)
- picoPower technology supports 1.8 V operation and ultra-low sleep current (vs ATMEGA649A-MUR)
Design Notes
Place a 100 nF decoupling capacitor within 3 mm of each VCC pin (pin 1, pin 50) and a 10 uF bulk capacitor near the AVCC pin (pin 3). The exposed thermal pad (EP) on the underside of the 64-QFN package MUST be soldered to a ground pour of at least 1 square inch to meet thermal and electrical specifications. Multiple ground vias in the EP pour reduce inductance and improve ADC noise immunity.
Route the JTAG signals (TCK pin 62, TMS pin 63, TDO pin 64) away from switching nodes and the LCD segment bus to avoid coupling during debug. Keep crystal traces (XTAL1 pin 45, XTAL2 pin 46) short and symmetric with a grounded guard ring. The analog supply (AVCC pin 3) should be filtered with a ferrite bead or 10 ohm resistor from VCC to provide clean ADC reference voltage.
Do not exceed 5.5 V on any VCC or AVCC pin - the absolute maximum rating is 6.0 V but sustained operation above 5.5 V risks EEPROM corruption. The RESET pin (pin 49) requires a 10 kohm pull-up to VCC and, if not used, can be left open only if the RSTDISBL fuse is programmed. When using the internal LCD controller, populate the LCDCAP pin (pin 14) with a 1 nF to 100 nF capacitor to stabilize the internal charge pump.
Estimated: at maximum 16 MHz operation and 5.5 V supply, the ATMEGA649P-MUR draws approximately 15 mA active, dissipating roughly 80 mW in the 64-QFN package. With the EP soldered to a 1 sq in copper pour, junction-to-ambient thermal resistance is approximately 30 C/W, yielding a 2.4 C temperature rise - well within the 125 C junction limit. Without the EP soldered, junction temperature can exceed limits at elevated ambient.
Compliance Information
RoHS compliant per Microchip product page. Green / Pb-free per Microchip Direct listing. Not AEC-Q100 qualified - for automotive safety applications choose a different part.
