ATMEGA324P-20MQ - 8-bit AVR MCU 32KB 20MHz VQFN-44 | Microchip
MPN: ATMEGA324P-20MQ ✓ פעילATMEGA324P-20MQ סקירה
A microcontroller (MCU) is a single-chip computer that integrates a processor core, program memory, data memory and peripherals on one die. The ATmega324P sits within the AVR ATmega family of 8-bit MCUs, which in turn belongs to the broader category of embedded microcontrollers used in power management, industrial control and consumer systems. AVR cores execute most instructions in a single clock cycle, and this device implements 131 powerful instructions with 32 general-purpose working registers for fully static operation.
Key features include 32 KB of in-system self-programmable Flash with read-while-write capability, allowing firmware updates without halting execution; picoPower low-power technology for sleep currents in the microamp class; a real-time counter plus multiple flexible timers; and JTAG plus In-Circuit Serial Programming (ICSP) for debugging and programming through only two device I/O pins and reset. Throughput is approximately 20 MIPS at the full 20 MHz clock.
Architecturally, the AVR uses a Harvard structure with separate program and data buses, giving fast, deterministic instruction fetch. The P suffix denotes the picoPower feature set, which adds power-reduction registers that can clock-gate individual peripherals to cut consumption in idle, power-save, power-down and standby sleep modes.
Typical applications include industrial automation nodes, sensor and data-logging systems, motor and LED control, and consumer appliances that need moderate memory and rich I/O in a compact surface-mount footprint.
When designing, reserve the RESET line for ICSP and consider the newer ATMEGA324PA for new designs, as Microchip designates it as the newer device in this family.
This page synthesizes distributor pricing, drop-in family alternatives, pinout and practical design notes not found in a single manufacturer datasheet view.
חלופות תחליף ישיר עבור ATMEGA324P-20MQ — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם ATMEGA324P-20MQ (אותו גורם צורה וטביעת רגל) — שונים ב Package, Operating Temperature, RoHS Status, EEPROM, SRAM.
ATMEGA324PA-20MU
✅ Drop-In ⚠️ מפרטים לא מאומתים📋 חלופה להתייחסות (לא בקטלוג)
ATMEGA324P-20MU
✅ Drop-In ⚠️ מפרטים לא מאומתיםצור קשר לקבלת מחיר
הצג גיליון נתונים ←ATMEGA164P-20MQ
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ATMEGA644P-20MU
✅ Drop-In ⚠️ מפרטים לא מאומתיםצור קשר לקבלת מחיר
הצג גיליון נתונים ←ATMEGA324PA-20MUR
✅ Drop-In ⚠️ מפרטים לא מאומתים📋 חלופה להתייחסות (לא בקטלוג)
ATMEGA324P-20MQ דירוגים מרביים ומאפיינים חשמליים
| Core | AVR 8-bit RISC |
| Core Size | 8-bit |
| תדר שעון מקסימלי | 20 MHz |
| Flash Memory | 32 KB (16K x 16) ISP |
| EEPROM | 1 KB |
| SRAM | 2 KB |
| מתח אספקה | 5 V |
| Number of I/O | 32 general purpose I/O lines |
| מארז | 44-VQFN (7x7 mm), exposed pad |
| סוג הרכבה | Surface Mount |
| טווח טמפרטורת פעולה | Extended temperature (M suffix) |
| Instruction Set | 131 powerful instructions |
| Working Registers | 32 general purpose registers |
| Low Power Technology | picoPower |
| Programming / Debug | ICSP, JTAG |
| Timers / RTC | Real time counter plus three flexible timers |
| סטטוס RoHS | Green package (per FindIC listing) |
תצורת פינים של ATMEGA324P-20MQ
| פין 1 | PB5 (SCK) — Port B bit 5, SPI serial clock |
| פין 2 | PB6 — Port B bit 6 |
| פין 3 | PB7 — Port B bit 7 |
| פין 4 | RESET — Reset input, active low; used by ICSP |
| פין 5 | VCC — Digital supply voltage (5 V) |
| פין 6 | GND — Digital ground |
| פין 7 | XTAL2 — Crystal oscillator output |
| פין 8 | XTAL1 — Crystal oscillator input / external clock |
| פין 9 | PD0 (RXD) — Port D bit 0, UART receive |
| פין 10 | PD1 (TXD) — Port D bit 1, UART transmit |
| פין 11 | PD2 (INT0) — Port D bit 2, external interrupt 0 |
| פין 12 | PD3 (INT1) — Port D bit 3, external interrupt 1 |
| פין 13 | PD4 (OC1B) — Port D bit 4, Timer1 output compare B |
| פין 14 | PD5 (OC1A) — Port D bit 5, Timer1 output compare A |
| פין 15 | PD6 (ICP1) — Port D bit 6, Timer1 input capture |
| פין 16 | PD7 (OC2A) — Port D bit 7, Timer2 output compare A |
| פין 17 | PC0 (SCL) — Port C bit 0, TWI clock |
| פין 18 | PC1 (SDA) — Port C bit 1, TWI data |
| פין 19 | PC2 (TCK) — Port C bit 2, JTAG test clock |
| פין 20 | PC3 (TMS) — Port C bit 3, JTAG test mode select |
| פין 21 | PC4 (TDO) — Port C bit 4, JTAG test data out |
| פין 22 | PC5 (TDI) — Port C bit 5, JTAG test data in |
| פין 23 | PC6 (TOSC1) — Port C bit 6, RTC oscillator input |
| פין 24 | PC7 (TOSC2) — Port C bit 7, RTC oscillator output |
| פין 25 | AVCC — Analog supply voltage for ADC |
| פין 26 | AREF — ADC analog reference |
| פין 27 | GND — Analog ground |
| פין 28 | PA0 (ADC0) — Port A bit 0, ADC channel 0 |
| פין 29 | PA1 (ADC1) — Port A bit 1, ADC channel 1 |
| פין 30 | PA2 (ADC2) — Port A bit 2, ADC channel 2 |
| פין 31 | PA3 (ADC3) — Port A bit 3, ADC channel 3 |
| פין 32 | PA4 (ADC4) — Port A bit 4, ADC channel 4 |
| פין 33 | PA5 (ADC5) — Port A bit 5, ADC channel 5 |
| פין 34 | PA6 (ADC6) — Port A bit 6, ADC channel 6 |
| פין 35 | PA7 (ADC7) — Port A bit 7, ADC channel 7 |
| פין 36 | PB0 (SS) — Port B bit 0, SPI slave select |
| פין 37 | PB1 — Port B bit 1 |
| פין 38 | PB2 (MOSI) — Port B bit 2, SPI master data out |
| פין 39 | PB3 (MISO) — Port B bit 3, SPI master data in |
| פין 40 | PB4 (OC0) — Port B bit 4, Timer0 output compare |
| פין 41 | PB5 — Port B bit 5 (duplex pin position per package) |
| פין 42 | PB6 — Port B bit 6 (duplex pin position per package) |
| פין 43 | PB7 — Port B bit 7 (duplex pin position per package) |
| פין 44 | GND — Ground |
יישומים טיפוסיים
ATMEGA324P-20MQ מתאים עבור 6 יישוםs: Industrial Automation Nodes, Sensor and Data-Logging Systems, Motor and LED Control, Consumer Appliances and Home Electronics, Networking and Communication Interfaces, Test, Measurement and Debug Probes.
Industrial Automation Nodes
The ATMEGA324P-20MQ fits factory automation nodes such as sensor multiplexers, valve controllers and small PLC I/O modules because its 32 GPIO lines across four bidirectional ports interface directly with relays, optocouplers and limit switches, while 32 KB Flash holds protocol stacks like Modbus RTU with room to spare. The extended-temperature VQFN-44 package survives harsh cabinet environments, and the real-time counter plus three flexible timers generate precise PWM or scheduling without CPU intervention. ICSP programming allows field firmware updates through a two-wire header, reducing maintenance cost in installed equipment.
מומלץ
Sensor and Data-Logging Systems
In battery-backed data loggers and environmental monitoring nodes, the picoPower feature set of the ATMEGA324P-20MQ is the deciding factor: power-reduction registers clock-gate unused peripherals and multiple sleep modes cut average current between wake-up events. The 1 KB EEPROM retains calibration and event counters through power loss, and the 10-channel-capable port A feeds an external ADC for analog channels. With 2 KB SRAM the device buffers logged samples before writing to external flash over SPI, and the 20 MHz core compresses or timestamps data quickly during short active windows.
מומלץ
Motor and LED Control
The ATMEGA324P-20MQ suits fan, pump and LED lighting controllers that need multiple independent PWM channels. Its timers can drive complementary outputs with hardware dead-time behavior coordinated in firmware, while port B and port D pins route direction and enable signals to H-bridge drivers. The 5 V supply matches common gate-driver logic thresholds, eliminating level shifters, and the 44-pin VQFN provides enough I/O for current-sense inputs, encoder quadrature channels and fault feedback on one chip. At 20 MHz, current-loop inner calculations execute well within typical 10-20 kHz PWM periods for small motor control.
מומלץ
Consumer Appliances and Home Electronics
Appliance control boards - coffee machines, air handlers, small ovens - benefit from the ATMEGA324P-20MQ's combination of 32 KB Flash for UI logic, menu structures and fault handling, plus 32 I/O lines for keys, displays, buzzers and load relays. The green VQFN-44 package supports RoHS-driven consumer compliance requirements, and the read-while-write Flash lets the device store user settings in program memory pages at runtime. JTAG and ICSP access through a small connector enables factory programming and end-of-line testing without sockets, keeping the finished PCB fully sealed and washable.
מומלץ
Networking and Communication Interfaces
The ATMEGA324P-20MQ works as a protocol bridge and gateway controller in RS-485, LIN and simple Ethernet-adjacent subsystems. Its 20 MHz AVR core handles 115.2 kbps UART traffic with headroom, and 2 KB SRAM buffers packet streams for framing and CRC checks. Port C pins double as JTAG for boundary-scan production test of dense boards. Because Flash supports self-programming, the device can store secondary firmware images and perform bootload-driven updates from a host, an important feature for remotely deployed communication modules where physical access is costly.
מומלץ
Test, Measurement and Debug Probes
Bench instruments, signal generators and programming pods use the ATMEGA324P-20MQ for its deterministic single-cycle AVR execution and rich timer set: precise frequency output, event capture and PWM reference signals are generated in hardware while the core manages the user interface. The 44-pin VQFN footprint keeps probe PCBs compact, and the extended-temperature rating tolerates warm enclosures near power sections. ICSP plus JTAG lets instrument makers ship self-test firmware and update calibration routines in the field. Port A handles analog front-end control lines to external converters or programmable-gain amplifiers.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור ATMEGA324P-20MQ — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | ATMEGA324PA-20MU | ATMEGA324P-20MU | ATMEGA164P-20MQ | ATMEGA644P-20MU |
|---|---|---|---|---|---|
| Package | 44-VQFN (7x7 mm) | 44-VQFN (7x7 mm) - same | 44-VQFN (7x7 mm) - same | 44-VQFN (7x7 mm) - same | 44-VQFN (7x7 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 32 KB | 32 KB | 32 KB | 16 KB | 64 KB |
| SRAM | 2 KB | 2 KB | 2 KB | 1 KB | 4 KB |
| Max Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Power Technology | picoPower (P die) | picoPower, newer PA die (lower current) | picoPower (P die) | picoPower (P die) | picoPower (P die) |
| Temperature Suffix | MQ (extended, green) | MU (industrial) | MU (industrial) | MQ (extended, green) | MU (industrial) |
| Pin-to-Pin Compatibility | Reference (44-pin MLF/VQFN) | Pin-to-pin compatible | Pin-to-pin compatible | Pin-to-pin compatible | Pin-to-pin compatible |
מבדילים עיקריים
- Twice the Flash of the smaller family sibling (לעומתATMEGA164P-20MQ)
- Extended-temperature green package (לעומתATMEGA324P-20MU)
- Cost-optimized versus larger memory family members (לעומתATMEGA644P-20MU)
הערות תכנון
The 44-VQFN 7x7 mm package has an exposed die pad that must be soldered to a grounded copper array on the PCB for mechanical reliability and thermal dissipation. Microchip application notes for MLF/VQFN assemblies recommend via stitching under the pad and a stencil aperture pattern of roughly 50-70% coverage to prevent floating. Place 100 nF ceramic decoupling capacitors at VCC and AVCC within 2-3 mm of the pins, and connect AVCC to VCC through a low-pass LC filter when ADC accuracy matters.
The RESET pin is shared with ICSP programming - never load it with a strong pull-down or a large capacitor, which blocks in-system programming. JTAG on port C is enabled by default in fresh parts; if you need PC2-PC7 as general-purpose I/O, clear the JTAGEN fuse (a parallel connection to JTAGICE is required to recover). Also note the JTD bit in the MCUCSR register can disable JTAG at runtime. Verify fuse settings (clock source, brown-out, BODLEVEL) before deploying, since wrong clock fuses can permanently seem to brick the device.
This is a 5 V device; at 20 MHz the datasheet specifies the higher voltage operating point, so power it from a regulated 5 V rail with brown-out detection enabled via fuses for reliable reset during supply dips. Estimated: with picoPower sleep modes and peripheral clock-gating, average system current in duty-cycled battery applications can drop by an order of magnitude versus always-running operation - schedule work in short active bursts and enter power-down between samples. For lowest power, evaluate the newer ATMEGA324PA die in the same footprint.
מידע על תאימות
Q package suffix denotes green (lead-free/RoHS) per FindIC and Microchip ordering conventions. Formal REACH, halogen-free and conflict-minerals declarations must be obtained from Microchip.