ATMEGA328-MMH - 8-Bit AVR MCU 20MHz 32KB Flash VQFN-28 | Microchip
MPN: ATMEGA328-MMH ✓ فعالATMEGA328-MMH جائزہ
An 8-bit microcontroller (MCU) is a single integrated circuit that combines a processor core, program memory, data memory, and peripherals such as timers, UART, SPI, and I2C on one chip. Within the power-management and embedded-system hierarchy, the MCU sits at the heart of a device, reading sensors, driving actuators, and running the application firmware. The AVR ATmega family from Microchip (originally Atmel) is one of the most widely used 8-bit MCU families in industry and education.
Key features include the advanced RISC architecture with 131 powerful instructions and 32 general-purpose working registers, 32 KB of self-programmable Flash with read-while-write support, 1 KB EEPROM for non-volatile data storage, 23 general-purpose I/O lines, and a 10-bit ADC with up to 8 channels (including the dedicated ADC6/ADC7 pads on the VQFN package). Two 8-bit timers, one 16-bit timer, a USART, SPI, and two-wire interface (I2C) round out the peripheral set.
Technically, the ATMEGA328-MMH uses a Harvard architecture with separate program and data buses for parallel instruction and data access. It supports six sleep modes for aggressive power reduction, an on-chip debug interface (debugWIRE), and in-system programming via SPI. Supply voltage operation spans 2.5 V to 5.5 V per distributor data, supporting both 3.3 V and 5 V logic systems.
Typical applications include industrial control and automation nodes, consumer electronics, robotics, IoT sensor endpoints, and Arduino-compatible embedded designs - the ATmega328 core is the engine of the Arduino Uno platform, giving it unmatched community and toolchain support.
A key design consideration: at 20 MHz and 5 V the device is at its maximum rated speed grade, so verify the supply is a clean 5 V; derating the clock to 16 MHz or lower is required for reliable 3.3 V operation.
This page synthesizes distributor pricing, drop-in alternatives within the AVR family, pinout data, and practical design notes not found in the manufacturer datasheet.
کے لیے ڈراپ اِن متبادل ATMEGA328-MMH — یکساں پیکیج، پن سے پن مطابقت پذیر۔ مختلف پیکیج والے پرزے جن کے لیے PCB دوبارہ کام درکار ہو، شامل نہیں ہیں۔
اس سیریز میں مختلف ورژن
اسی سیریز کے ماڈلز جو ڈراپ اِن مطابقت رکھتے ہیں ATMEGA328-MMH (یکساں فارم فیکٹر اور فٹ پرنٹ) — میں مختلف Package, RoHS Status, EEPROM, Flash Memory, ADC Channels.
ATMEGA328P-MMH
✅ ڈراپ-اِن ⚠️ تفصیلات غیر تصدیق شدہقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →ATMEGA328-20MU
✅ ڈراپ-اِن ⚠️ تفصیلات غیر تصدیق شدہ📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
ATMEGA168PA-MMH
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
ATMEGA168PA-MU
✅ ڈراپ-اِن ⚠️ تفصیلات غیر تصدیق شدہقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →ATMEGA88PA-MMH
✅ ڈراپ-اِن ⚠️ تفصیلات غیر تصدیق شدہ📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
ATMEGA48PA-MMH
✅ ڈراپ-اِن ⚠️ تفصیلات غیر تصدیق شدہ📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
ATMEGA328-MMH زیادہ سے زیادہ ریٹنگز اور برقی خصوصیات
| Core Processor | AVR |
| Core Size | 8-Bit |
| Speed | 20 MHz |
| Flash Memory | 32 KB (16K x 16) |
| EEPROM | 1 KB |
| SRAM | 2 KB |
| Supply Voltage Range | 2.5 V to 5.5 V |
| General Purpose I/O | 23 |
| ADC Resolution | 10-bit |
| ADC Channels | 8 |
| Timers | Two 8-bit, One 16-bit |
| Communication Interfaces | USART, SPI, I2C (Two-Wire) |
| پیکیج | 28-VQFN (4x4 mm) with exposed pad |
| ماؤنٹنگ ٹائپ | Surface Mount |
| RoHS اسٹیٹس | Green (RoHS compliant per Mouser listing) |
| لائف سائیکل کی حالت | Active |
| Packaging | Tray |
ATMEGA328-MMH پن کنفیگریشن
| پن 1 | PC6 (RESET) — Reset input / I/O |
| پن 2 | PD0 (RXD) — Port D bit 0 / USART receive |
| پن 3 | PD1 (TXD) — Port D bit 1 / USART transmit |
| پن 4 | PD2 (INT0) — Port D bit 2 / external interrupt 0 |
| پن 5 | PD3 (INT1/OC2B) — Port D bit 3 / interrupt 1 / PWM |
| پن 6 | PD4 (T0/XCK) — Port D bit 4 / Timer0 clock |
| پن 7 | VCC — Digital supply voltage |
| پن 8 | GND — Ground |
| پن 9 | PB6 (XTAL1/TOSC1) — Crystal oscillator pin 1 / Port B bit 6 |
| پن 10 | PB7 (XTAL2/TOSC2) — Crystal oscillator pin 2 / Port B bit 7 |
| پن 11 | PD5 (T1/OC0B) — Port D bit 5 / Timer1 clock / PWM |
| پن 12 | PD6 (AIN0/OC0A) — Port D bit 6 / analog comparator / PWM |
| پن 13 | PD7 (AIN1) — Port D bit 7 / analog comparator |
| پن 14 | PB0 (ICP1/CLKO) — Port B bit 0 / input capture / clock out |
| پن 15 | PB1 (OC1A) — Port B bit 1 / PWM output |
| پن 16 | PB2 (SS/OC1B) — Port B bit 2 / SPI slave select / PWM |
| پن 17 | PB3 (MOSI/OC2A) — Port B bit 3 / SPI master out / PWM |
| پن 18 | PB4 (MISO) — Port B bit 4 / SPI master in |
| پن 19 | PB5 (SCK) — Port B bit 5 / SPI clock |
| پن 20 | AVCC — ADC supply voltage |
| پن 21 | AREF — ADC analog reference |
| پن 22 | GND — Ground |
| پن 23 | PC0 (ADC0) — Port C bit 0 / ADC channel 0 |
| پن 24 | PC1 (ADC1) — Port C bit 1 / ADC channel 1 |
| پن 25 | PC2 (ADC2) — Port C bit 2 / ADC channel 2 |
| پن 26 | PC3 (ADC3) — Port C bit 3 / ADC channel 3 |
| پن 27 | PC4 (ADC4/SDA) — Port C bit 4 / ADC / I2C data |
| پن 28 | PC5 (ADC5/SCL) — Port C bit 5 / ADC / I2C clock |
عام استعمالات
ATMEGA328-MMH کے لیے موزوں ہے 6 ایپلیکیشنs: Arduino-Compatible Embedded Designs, Industrial Control and Automation, IoT Sensor Endpoints, Robotics and Hobby Controllers, Consumer Electronics, Test and Measurement Accessories.
Arduino-Compatible Embedded Designs
The ATMEGA328-MMH is the silicon behind the Arduino Uno platform, making it the default choice for Arduino-compatible custom boards. Its 32 KB Flash holds the Arduino Uno bootloader plus user sketches, and its 23 GPIO lines map directly to the standard Arduino pin mapping. In a custom VQFN-28 design, connect an external 16 MHz crystal, an ISP header, and decoupling capacitors to replicate Uno behavior; the MMH variant additionally exposes ADC6/ADC7 as dedicated analog inputs unavailable on DIP versions. Firmware developed with the Arduino IDE requires no code changes when migrating from an Uno to a board based on this part, preserving the vast Arduino library ecosystem.
تجویز کردہ
Industrial Control and Automation
In factory automation nodes, the ATMEGA328-MMH's 20 MIPS throughput, hardware USART, SPI, and I2C interfaces make it well suited for sensor aggregation and actuator control. The 10-bit ADC with 8 channels digitizes analog transducers (0-10 V via dividers, 4-20 mA via sensing resistors), while the 16-bit timer generates precise PWM for motor drives or valve control. Operating from a 5 V industrial supply with 2.5-5.5 V tolerance gives noise margin headroom typical of electrically harsh panels. Its watchdog timer and brown-out detector support fail-safe recovery, and the 1 KB EEPROM stores calibration and configuration data that must survive power cycles without external non-volatile memory.
تجویز کردہ
IoT Sensor Endpoints
For battery-powered IoT sensor nodes, the ATMEGA328-MMH combines adequate compute (20 MHz AVR core) with six sleep modes that drop the core to microamp-level consumption between sampling intervals. Typical usage: sleep in power-down mode, wake on watchdog or external interrupt, sample a sensor over I2C or the internal 10-bit ADC, then transmit via an external radio module over SPI. At 3.3 V, derate the clock to approximately 13-16 MHz per the voltage-versus-frequency curve in the Microchip datasheet to guarantee operation across temperature and battery discharge. The 2 KB SRAM comfortably hosts protocol stacks for simple sensor payloads, and the VQFN-28's small 4x4 mm footprint suits compact node PCBs.
تجویز کردہ
Robotics and Hobby Controllers
Robotics subsystems such as motor controller boards, servo drivers, and line-following robots benefit from the ATMEGA328-MMH's blend of PWM resources and analog inputs. Two 8-bit timers and one 16-bit timer generate multiple simultaneous PWM channels for H-bridge motor control, while the 10-bit ADC reads potentiometer, current-sense, and IR-reflectance signals. The AVR's single-cycle instruction execution makes bit-banged protocols and fast control loops practical at 20 MHz. Community availability of motor-driver libraries and shields designed for the ATmega328 shortens development time significantly compared with less popular cores, and the 23 GPIO lines drive servos and logic-level MOSFET gate drivers directly at 5 V.
تجویز کردہ
Consumer Electronics
Consumer products - kitchen appliances, remote controls, small displays, and chargers - use the ATMEGA328-MMH where a low-cost, reliable 8-bit MCU with mature tooling is required. Its 32 KB Flash accommodates feature-rich firmware including UI state machines and EEPROM-backed user settings, while the internal RC oscillator eliminates the cost of an external crystal in timing-tolerant designs. The 2.5-5.5 V supply range allows direct operation from single-cell lithium stacks via a regulator or from 5 V USB power. Microchip's active lifecycle status and multi-source distributor availability (9 distributors per Octopart) reduce supply risk for multi-year consumer production runs, an important consideration for appliance manufacturers.
تجویز کردہ
Test and Measurement Accessories
Bench accessories such as programmable load controllers, signal generators, and calibration fixtures leverage the ATMEGA328-MMH's timers and ADC for measurement-grade timing. The 16-bit timer with input capture can timestamp external events with microsecond resolution at 20 MHz, and the 10-bit ADC, when paired with a precision voltage reference on the AREF pin, performs 8-channel monitoring of supply rails and sensor outputs. debugWIRE single-wire on-chip debugging over the RESET line simplifies firmware development on assembled boards without dedicating pins to a JTAG port. Its 5 V operation interfaces directly with common bench logic levels, avoiding level-shift circuitry in instrumentation prototypes.
تجویز کردہ
تجویز کردہ پروڈکٹس کا خلاصہ
کے لیے انجینئرنگ ریفرنس ڈیٹا ATMEGA328-MMH — موازنہ، ڈیزائن رہنمائی، اور تعمیل کی معلومات۔
انتخاب کی گائیڈ
متبادلات کے ساتھ موازنہ
| پیرامیٹر | یہ پروڈکٹ | ATMEGA328P-MMH | ATMEGA328-20MU | ATMEGA168PA-MMH | ATMEGA88PA-MMH |
|---|---|---|---|---|---|
| Package | 28-VQFN (4x4 mm) | 28-VQFN (4x4 mm) - same | 28-VQFN (4x4 mm) - same | 28-VQFN (4x4 mm) - same | 28-VQFN (4x4 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 32 KB | 32 KB | 32 KB | 16 KB | 8 KB |
| SRAM | 2 KB | 2 KB | 2 KB | 1 KB | 1 KB |
| EEPROM | 1 KB | 1 KB | 1 KB | 512 B | 512 B |
| Max Clock Speed | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| picoPower Low-Sleep-Current | No | Yes | No | Yes | Yes |
اہم امتیازی خصوصیات
- Double the program memory of the 168 family (بمقابلہATMEGA168PA-MMH)
- Arduino ecosystem compatibility (بمقابلہATMEGA88PA-MMH)
- Dedicated ADC6/ADC7 analog inputs (بمقابلہATMEGA328-20MU in DIP-28 variants (ATMEGA328P-PU))
ڈیزائن نوٹس
Match the clock speed to the supply voltage: 20 MHz operation requires approximately 4.5-5.5 V, while 3.3 V systems must derate to roughly 13-16 MHz per the speed-versus-VCC curve in the Microchip ATmega328 datasheet. Connect AVCC (pin 20) to VCC through a low-pass LC filter (10 uH inductor plus 100 nF capacitor) when ADC accuracy matters, and never leave AVCC floating even if the ADC is unused. Enable the brown-out detector at 2.7 V or 4.3 V via fuses to prevent EEPROM corruption during undervoltage events.
The VQFN-28 (4x4 mm) exposed pad on the package bottom should be soldered to a grounded copper area on the PCB for mechanical reliability and thermal dissipation - use a solder paste stencil with approximately 50-70% coverage on the center pad to avoid excessive solder squeeze-out onto the perimeter pads. Place 100 nF ceramic decoupling capacitors within 2 mm of the VCC and AVCC pins, one per supply pin, plus 10 uF bulk capacitance near the part. The exposed ADC6/ADC7 pads exist only on this VQFN variant, so route them as short, guarded analog traces.
Do not assume Arduino Uno compatibility at the board level: the Uno runs 16 MHz, while this part is rated to 20 MHz - if you fuse it for 20 MHz, Arduino timing functions (millis, delay) must be reconfigured. PB6/PB7 serve as XTAL1/XTAL2 when an external crystal is used, leaving only 22 GPIO in that configuration. Reset (PC6) needs a 10 k pull-up for ISP programming reliability, and debugWIRE shares the RESET line - disable debugWIRE fuse before switching to ISP programming to avoid lockout.
Estimated: at 5 V, 20 MHz with all I/O lightly loaded, the ATmega328 dissipates on the order of 30-50 mV-scaled milliwatts (typical active current ~ 10-15 mA at 5 V, i.e. 50-75 mW), so the 4x4 mm VQFN with an exposed pad and a modest ground pour keeps junction temperature well within the industrial range - no heatsink consideration is required. Power consumption becomes a design factor only in sleep-mode-driven battery applications, where choosing the ATMEGA328P-MMH picoPower variant reduces power-down current to sub-microamp levels.
تعمیل کی معلومات
Mouser lists ATMEGA328-MMH as 'GRN' (green/RoHS). AEC-Q100 qualification is not marketed for this commercial-grade part. REACH and conflict-minerals status not stated in provided data.
