ATMEGA324PV-10AUR - 8-bit AVR MCU 32KB 44-TQFP | Microchip
MPN: ATMEGA324PV-10AUR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.14 | $5.14 |
| 10 | $4.63 | $46.30 |
| 100 | $4.12 | $412.00 |
| 500 | $3.71 | $1,855.00 |
| 1,000 | $3.3 | $3,300.00 |
ATMEGA324PV-10AUR Overview
An AVR microcontroller is a modified Harvard-architecture 8-bit RISC processor in which most of the 131 instructions execute in a single clock cycle, placing this device at the entry level of the microcontroller hierarchy within broader power-management and embedded-control IC families. The ATmega164P/324P/644P family shares a common die platform and pinout, differing mainly in Flash, EEPROM, and SRAM capacity.
Key differentiating features include read-while-write ISP Flash for in-system firmware updates, the picoPower technology suite for microamp-level sleep currents, a real-time counter (RTC), and 32 general-purpose working registers tightly coupled to the ALU. The 8-channel 10-bit ADC supports rail-to-rail analog sensing from the 1.8V low-voltage rail, and hardware TWI plus dual USARTs simplify multi-device communication.
Architecturally, the device uses an advanced RISC core with single-cycle execution, eliminating software latency in interrupt response and bit manipulation, which benefits deterministic control loops. Peripheral clock gating under picoPower control allows individual modules to be stopped without losing register state.
Typical applications include industrial sensor nodes, battery-powered instruments, HVAC and lighting control, and serial-protocol bridges that exploit the two USARTs.
Design consideration: the PV speed grade limits clocking to 10MHz; if 16-20MHz operation is required, verify the faster ATMEGA324P-20AUR speed grade on the same footprint.
This page adds distributor pricing, drop-in alternatives, and design notes beyond the manufacturer datasheet.
Drop-in alternatives for ATMEGA324PV-10AUR — 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 ATMEGA324PV-10AUR (same form factor and footprint) — differing in Package, Flash Memory, ADC, Supply Voltage Range, Instructions.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA324PA-AUR
✅ Drop-In✓ In Stock
$1.98 / Unit
View Datasheet →ATMEGA324P-20AUR
✅ Drop-In✓ In Stock
$4.52 / Unit
View Datasheet →ATMEGA324A-AU
✅ Drop-In✓ In Stock
$2.09 / Unit
View Datasheet →ATMEGA324P-A15MZ
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.85 / Unit
View Datasheet →ATMEGA644A-AU
✅ Drop-In📋 Reference alternative (not in catalog)
ATMEGA164PA-AU
✅ Drop-In✓ In Stock
$2.75 / Unit
View Datasheet →ATMEGA324PV-10AUR Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit AVR RISC |
| Max Clock Speed | 10 MHz |
| Flash Memory | 32 KB (16K x 16) ISP Flash |
| EEPROM | 1 KB |
| SRAM | 2 KB |
| Supply Voltage Range | 1.8 V to 5.5 V |
| Instruction Set | 131 instructions, most single-cycle |
| General Purpose I/O | 32 lines |
| Working Registers | 32 |
| ADC | 8-channel, 10-bit |
| USART | 2 |
| Serial Interfaces | TWI (I2C-compatible), SPI, 2x USART |
| Timer/Counters | 3 flexible with compare modes and PWM |
| Real Time Counter | Yes (RTC) |
| Package | 44-TQFP (10x10 mm, 0.8 mm pitch) |
| Mounting Type | Surface Mount |
| Low Power Technology | picoPower |
| Lifecycle Status | Active |
| Packaging | Tape & Reel (R suffix) |
ATMEGA324PV-10AUR Pin Configuration
| Pin 1 | PA4 (ADC4/TCK) — Port A bit 4 / ADC channel 4 / JTAG test clock |
| Pin 2 | PA5 (ADC5/TMS) — Port A bit 5 / ADC channel 5 / JTAG test mode select |
| Pin 3 | PA6 (ADC6/TDO) — Port A bit 6 / ADC channel 6 / JTAG test data output |
| Pin 4 | PA7 (ADC7/TDI) — Port A bit 7 / ADC channel 7 / JTAG test data input |
| Pin 5 | VCC — Digital supply voltage (1.8V-5.5V) |
| Pin 6 | GND — Ground |
| Pin 7 | AVCC — Analog supply for ADC and Port A |
| Pin 8 | PA0 (ADC0) — Port A bit 0 / ADC channel 0 |
| Pin 9 | PA1 (ADC1) — Port A bit 1 / ADC channel 1 |
| Pin 10 | PA2 (ADC2) — Port A bit 2 / ADC channel 2 |
| Pin 11 | PA3 (ADC3) — Port A bit 3 / ADC channel 3 |
| Pin 12 | PB0 (XCK0/T0) — Port B bit 0 / USART0 external clock / Timer0 external clock |
| Pin 13 | PB1 (T1) — Port B bit 1 / Timer1 external clock input |
| Pin 14 | PB2 (AIN0/INT2) — Port B bit 2 / Analog comparator positive input / External interrupt 2 |
| Pin 15 | PB3 (AIN1/OC0A) — Port B bit 3 / Analog comparator negative input / Timer0 output compare A |
| Pin 16 | PB4 (SS) — Port B bit 4 / SPI slave select |
| Pin 17 | PB5 (MOSI) — Port B bit 5 / SPI master output slave input |
| Pin 18 | PB6 (MISO) — Port B bit 6 / SPI master input slave output |
| Pin 19 | PB7 (SCK) — Port B bit 7 / SPI serial clock |
| Pin 20 | RESET — Active-low reset input |
| Pin 21 | VCC — Digital supply voltage (1.8V-5.5V) |
| Pin 22 | GND — Ground |
| Pin 23 | XTAL2 — Crystal oscillator output |
| Pin 24 | XTAL1 — Crystal oscillator input / external clock input |
| Pin 25 | PD0 (RXD0) — Port D bit 0 / USART0 receive data |
| Pin 26 | PD1 (TXD0) — Port D bit 1 / USART0 transmit data |
| Pin 27 | PD2 (RXD1/INT0) — Port D bit 2 / USART1 receive data / External interrupt 0 |
| Pin 28 | PD3 (TXD1/INT1) — Port D bit 3 / USART1 transmit data / External interrupt 1 |
| Pin 29 | PD4 (XCK1/OC1B) — Port D bit 4 / USART1 external clock / Timer1 output compare B |
| Pin 30 | PD5 (OC1A) — Port D bit 5 / Timer1 output compare A (PWM) |
| Pin 31 | PD6 (ICP1) — Port D bit 6 / Timer1 input capture |
| Pin 32 | PD7 (OC2A) — Port D bit 7 / Timer2 output compare A (PWM) |
| Pin 33 | PC0 (SCL) — Port C bit 0 / TWI serial clock |
| Pin 34 | PC1 (SDA) — Port C bit 1 / TWI serial data |
| Pin 35 | PC2 (TCK) — Port C bit 2 / JTAG test clock |
| Pin 36 | PC3 (TMS) — Port C bit 3 / JTAG test mode select |
| Pin 37 | PC4 (TDO) — Port C bit 4 / JTAG test data output |
| Pin 38 | PC5 (TDI) — Port C bit 5 / JTAG test data input |
| Pin 39 | PC6 (TOSC1) — Port C bit 6 / Timer oscillator input for RTC (32.768 kHz crystal) |
| Pin 40 | PC7 (TOSC2) — Port C bit 7 / Timer oscillator output for RTC |
| Pin 41 | AREF — ADC analog reference voltage |
| Pin 42 | GND — Ground |
| Pin 43 | AVCC — Analog supply for ADC and Port A |
| Pin 44 | VCC — Digital supply voltage (1.8V-5.5V) |
Typical Applications
ATMEGA324PV-10AUR is suitable for 6 applications: Industrial Sensor Nodes, Battery-Powered Instruments, Serial Protocol Bridges, HVAC and Lighting Control, Consumer Appliance Control, Data Loggers and Metering.
Industrial Sensor Nodes
The ATMEGA324PV-10AUR fits industrial sensor nodes because its picoPower architecture holds sleep currents at microamp levels while the 8-channel 10-bit ADC digitizes up to eight analog sensors from a single 1.8V-5.5V rail. In a typical node, the MCU samples sensors via the ADC and PORTA, buffers results in the 2KB SRAM, and streams data over one USART to an RS-485 transceiver while the second USART remains available for local service. The 32KB Flash accommodates protocol stacks and OTA-update bootloaders using read-while-write ISP capability. Because the core executes most instructions in a single cycle at 10MHz, control-loop determinism is maintained without a faster, power-hungry clock.
Recommended
Battery-Powered Instruments
Portable meters and handheld instruments benefit directly from the 1.8V minimum supply, allowing direct operation from two AA cells without a boost converter. The picoPower real-time counter keeps timekeeping alive in asynchronous sleep, waking the 10MHz AVR core only for measurements, so battery life targets of years are realistic. The 1KB EEPROM stores calibration constants across power cycles, and the 10-bit ADC reads user controls and sensor front ends. With 32 GPIO lines, keypads, segment or small LCD drives, and status LEDs connect directly. The 44-TQFP 0.8mm pitch remains hand-assemblable for low-volume instrument production, and the tape-and-reel R suffix supports automated assembly at scale.
Recommended
Serial Protocol Bridges
With two independent USARTs plus TWI and SPI on one chip, the ATMEGA324PV-10AUR is well suited to protocol-conversion duties such as UART-to-UART gateways, RS-232-to-RS-485 converters, and I2C-to-serial adapters. Each USART can run a different baud rate, and buffer handling fits comfortably in 2KB SRAM; the single-cycle 10MHz core leaves ample MIPS headroom for framing, CRC, and flow control in software. The byte-oriented TWI provides master or slave I2C termination, while SPI serves high-throughput external memory. The 32KB Flash leaves room for protocol firmware plus a bootloader, and read-while-write lets field updates proceed without halting the active bridge.
Recommended
HVAC and Lighting Control
Building automation boards use the ATMEGA324PV-10AUR for thermostat, damper, and dimming control because the three timer/counters generate multiple PWM channels for heater, fan, and LED drivers while the RTC maintains schedules from a 32.768kHz crystal on the TOSC pins. The 8-channel ADC reads thermistors, humidity sensors, and potentiometer setpoints, and the TWI bus attaches external EEPROM or displays. Operation on 5V industrial rails simplifies interface to legacy actuators, and the 1.8V floor supports battery-backed thermostat variants on the same PCB design. PicoPower sleep between schedule ticks cuts standby consumption in always-on thermostats.
Recommended
Consumer Appliance Control
White-goods and small-appliance controllers leverage the device's combination of 32 GPIO lines, PWM timers, and robust AVR architecture for keypad scanning, display multiplexing, and motor or heater control on a single MCU. The modified Harvard RISC core executes bit-manipulation instructions in one cycle, keeping button debouncing and LED refresh cheap in CPU time. TWI connects configuration EEPROM or touch front ends, and one USART can report diagnostics to a service tool while the application firmware runs. The 5V-tolerant 5.5V maximum supply lets the MCU sit directly on unregulated mains-derived 5V rails common in appliances, trimming BOM cost by eliminating a regulator stage.
Recommended
Data Loggers and Metering
Energy meters, temperature loggers, and event recorders exploit the read-while-write ISP Flash to log data into program memory or an SPI/TWI external EEPROM while acquisition continues uninterrupted. The 10-bit ADC samples up to eight channels, and the RTC timestamping keeps records aligned over months from a low-power 32kHz crystal. With 1KB internal EEPROM for wear-leveled counters and 2KB SRAM as a ring buffer, the part covers low-to-medium logging rates; the ATMEGA644A-AU pin-compatible upgrade doubles the buffer for denser logging. The 44-TQFP footprint suits both compact logger PCBs and panel-meter assemblies, and 5V operation eases interfacing to industrial signal conditioning.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA324PV-10AUR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA324PA-AUR | ATMEGA324P-20AUR | ATMEGA324A-AU | ATMEGA644A-AU | ATMEGA164PA-AU |
|---|---|---|---|---|---|---|
| Package | 44-TQFP (10x10 mm) | 44-TQFP - same | 44-TQFP - same | 44-TQFP - same | 44-TQFP - same | 44-TQFP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Max Clock Speed | 10 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Flash Memory | 32 KB | 32 KB | 32 KB | 32 KB | 64 KB | 16 KB |
| SRAM | 2 KB | 2 KB | 2 KB | 2 KB | 4 KB | 1 KB |
| EEPROM | 1 KB | 1 KB | 1 KB | 1 KB | 2 KB | 0.5 KB |
| Supply Voltage Range | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 2.5 V / 3.3 V / 5 V grades | 1.8 V to 5.5 V |
| Low Power Technology | picoPower | picoPower (enhanced) | picoPower | standard | standard | picoPower |
Key Differentiators
- Lowest-voltage operation in the ATmega324 family (vs ATMEGA644A-AU)
- Designated successor with lower power and higher speed (vs ATMEGA324PA-AUR)
- Balanced 32KB memory density (vs ATMEGA164PA-AU)
Design Notes
Place 100nF ceramic decoupling capacitors directly across each VCC/GND pin pair (pins 5/6, 21/22, 44/42) and a separate 100nF on AVCC (pins 7 and 43) with a 10uH inductor or ferrite bead tying AVCC to VCC to filter ADC supply noise. When running near the 1.8V floor for battery designs, remember the maximum safe clock scales with VCC - the 10MHz speed grade assumes adequate headroom, so verify the voltage-versus-frequency curve in the manufacturer datasheet before finalizing the regulator.
The 44-TQFP 10x10mm 0.8mm-pitch footprint requires a symmetric land pattern; add thermal vias sparingly since this is not an exposed-pad package. Keep the AREF pin trace short with its own 100nF capacitor to ground, and route the ADC PORTA lines away from the XTAL and USART clock lines. Connect TOSC1/TOSC2 (pins 39/40) crystal guard traces away from switching loads for reliable 32.768kHz RTC operation. SPI (PB4-PB7) should be length-matched only if driving fast external Flash; otherwise standard routing suffices.
Three pitfalls recur with this part: (1) firmware compiled for 16-20MHz ATmega324 variants will time out all USART baud rates and delays on this 10MHz device - verify F_CPU in your build flags; (2) the PV speed grade is the limiting factor for new designs, so standardize on ATMEGA324PA-AUR for future BOMs while keeping the same footprint; (3) the RESET pin (20) must not be left floating - use a 10k pull-up, and note that pin 20 doubles as the ISP programming line, so add a series 100 ohm resistor if external circuitry loads it during programming.
Compliance Information
Compliance statuses were not stated in the provided verified web data; the 'R' suffix indicates tape-and-reel packing. Verify RoHS/REACH status on the Microchip product page or DigiKey compliance data before release.
